Aim. To establish the dependence of the front loader performance on the bulk density of the rock mass at the mining of iron ore deposit. Research methodology. At the developing the methodology, analytical and computational research methods were used to determine the time of working off rock mass of different density by a front loader. Appropriate calculation methods are relevant for determining the required amount of technical equipment and are acceptable for modern mining. Research results. A method has been developed for establishing the duration of the working cycle and the productivity of a front-end loader when mining different types of rock mass at an iron ore pit mining. Efficient parameters of rock extraction have been established, depending on changes in rock density. In the course of the study, the relationship between the density of the rock mass and the coefficient of filling and the coefficient of loosening of the rock was established. The influence of these coefficients directly on the performance of front loaders is determined.The indicators of these coefficients depend on the physical and mechanical properties of soft and rocky rocks and can change the performance of front loaders up to 5 times. Scientific novelty. It has been established that the duration of the working cycle is based on the time of digging (depending on the specific gravity of the rock mass), the time of maneuvering and the time of unloading, which are determined by the technical characteristics of mining machines. The influence of the bulk density of the rock mass on the duration of the working cycle and the performance of the front loader is determined. The required number of front-end loaders of different capacities was calculated as excavation and loading equipment in the conditions of the iron ore deposit mining. Practical value. The developed method for calculating the performance of a front-end loader depending on the density of the rock mass makes it possible to determine the effective number of loaders in the conditions of mining iron ore pits, which is confirmed by the example of the Eristovsky MPP.
{"title":"Determination the influence of the rock mass density on the productivity of wheel loaders at the iron ore pit mining","authors":"B. Sobko, O. Lozhnikov, M. Voronyĭ","doi":"10.33271/crpnmu/71.007","DOIUrl":"https://doi.org/10.33271/crpnmu/71.007","url":null,"abstract":"Aim. To establish the dependence of the front loader performance on the bulk density of the rock mass at the mining of iron ore deposit. Research methodology. At the developing the methodology, analytical and computational research methods were used to determine the time of working off rock mass of different density by a front loader. Appropriate calculation methods are relevant for determining the required amount of technical equipment and are acceptable for modern mining. Research results. A method has been developed for establishing the duration of the working cycle and the productivity of a front-end loader when mining different types of rock mass at an iron ore pit mining. Efficient parameters of rock extraction have been established, depending on changes in rock density. In the course of the study, the relationship between the density of the rock mass and the coefficient of filling and the coefficient of loosening of the rock was established. The influence of these coefficients directly on the performance of front loaders is determined.The indicators of these coefficients depend on the physical and mechanical properties of soft and rocky rocks and can change the performance of front loaders up to 5 times. Scientific novelty. It has been established that the duration of the working cycle is based on the time of digging (depending on the specific gravity of the rock mass), the time of maneuvering and the time of unloading, which are determined by the technical characteristics of mining machines. The influence of the bulk density of the rock mass on the duration of the working cycle and the performance of the front loader is determined. The required number of front-end loaders of different capacities was calculated as excavation and loading equipment in the conditions of the iron ore deposit mining. Practical value. The developed method for calculating the performance of a front-end loader depending on the density of the rock mass makes it possible to determine the effective number of loaders in the conditions of mining iron ore pits, which is confirmed by the example of the Eristovsky MPP.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82668481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Voitenko, V. Vapnichna, M. Krivtsov, O. Voitenko
The purpose of the article wasanalysis of the reasons for the different velocity of transition of the "well-reservoir" system from one thermodynamic state to another based on experimental data on time and main energy parameters for the conditions of gas and oil and gas fields. The methods. Experimental determination of the transition time of wells to industrial production mode; and analysis of experimental data. Findings. The transition time of the "well-reservoir" system from one thermodynamic state to another is determined by the internal energy of the reservoir and depends on the energy of external influence and the determining parameters: reservoir pressure and temperature. For traditional reservoirs - collectors, including for reservoirs with low reservoir pressures, it is 104 - 107 s. For formations with high formation pressures, the forecast time for the transition of the well to the mode of industrial production or emergency release of formation fluid is 100 - 103 s. Theoriginality. The work shows that in the case of low-energy impact, structural changes in rocks in reservoir conditions occur under sublimit slow loads at the level of approximately 40...70% of the limit value of the dynamic strength of the reservoir rock. It is experimentally shown that the transition of the "well-reservoir" system from one thermodynamic state to another flows for a time that depends on the internal energy of the reservoir and it decreases from t=104 – 107 s to t=100 – 103 and from ln t = 9.3...14.8 to ln t = 0...6.9 in the case of an increase in the energy of external influence, or reservoir parameters - pressure and temperature. Practicalimplementation. The transition time of the "well-reservoir" system from one thermodynamic state to another is determined by the internal energy of the reservoir and depends on the energy of external influence and the determining parameters: reservoir pressure and temperature, as well as the energy of elastic or elastoplastic deformation of the rock. The practical value is the ability to determine the type of oil and gas deposit based on this parameter and choose equipment.
{"title":"On the time of well transition to industrial production mode","authors":"Y. Voitenko, V. Vapnichna, M. Krivtsov, O. Voitenko","doi":"10.33271/crpnmu/71.042","DOIUrl":"https://doi.org/10.33271/crpnmu/71.042","url":null,"abstract":"The purpose of the article wasanalysis of the reasons for the different velocity of transition of the \"well-reservoir\" system from one thermodynamic state to another based on experimental data on time and main energy parameters for the conditions of gas and oil and gas fields. The methods. Experimental determination of the transition time of wells to industrial production mode; and analysis of experimental data. Findings. The transition time of the \"well-reservoir\" system from one thermodynamic state to another is determined by the internal energy of the reservoir and depends on the energy of external influence and the determining parameters: reservoir pressure and temperature. For traditional reservoirs - collectors, including for reservoirs with low reservoir pressures, it is 104 - 107 s. For formations with high formation pressures, the forecast time for the transition of the well to the mode of industrial production or emergency release of formation fluid is 100 - 103 s. Theoriginality. The work shows that in the case of low-energy impact, structural changes in rocks in reservoir conditions occur under sublimit slow loads at the level of approximately 40...70% of the limit value of the dynamic strength of the reservoir rock. It is experimentally shown that the transition of the \"well-reservoir\" system from one thermodynamic state to another flows for a time that depends on the internal energy of the reservoir and it decreases from t=104 – 107 s to t=100 – 103 and from ln t = 9.3...14.8 to ln t = 0...6.9 in the case of an increase in the energy of external influence, or reservoir parameters - pressure and temperature. Practicalimplementation. The transition time of the \"well-reservoir\" system from one thermodynamic state to another is determined by the internal energy of the reservoir and depends on the energy of external influence and the determining parameters: reservoir pressure and temperature, as well as the energy of elastic or elastoplastic deformation of the rock. The practical value is the ability to determine the type of oil and gas deposit based on this parameter and choose equipment.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84583692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Improvement of the current methodology for calculating the parameters of drilling and blasting (D&B) by determining the explosive force by the degree of realization of the detonation velocity for all types of industrial explosives (IE). The methodology of research. To solve the problem, a systematic approach was used, including an analysis of the current industry methodology for calculating the parameters of D&B in underground ore mining using IE, improvement of the power-law dependence of the calculation of the line of least resistance (LLR) of charges by determining the coefficient of explosive force of the IE, taking into account the degree of implementation of the burning rate, as well as approbation of the improved technique in the conditions of the operating iron ore mine. Findings. According to the methodology for determining the coefficient of explosive force of explosives (EX) according to the degree of implementation of the burning rate and according to the results of experimental studies of the change in the burning rate of the bulk emulsion explosive (EE) Ukrainit-PP-2, an improvement is proposed for the current industry methodology for calculating the parameters of D&B for the mines of the Kriviy Rig basin and the Private Joint Stock Society "Zaporozhye iron ore plant" (PJSS "ZIOP"). This made it possible, in the conditions of the experimental block of the mine "Yubileinaya" of the PJSS "Sukhaya Balka", using the bulk EE Ukrainit-PP-2, to increase the LLR and the distance between the borehole bottom up to 17%, and to obtain good results of ore reduction. The originality. The well-known power-law dependence of the determination of the LLR of borehole for rock breaking has been improved through the refinement of the coefficient of explosive force of the IE, which takes into account the degree of realization of the burning rate EX. Practical implications. The results of the research have improved the power-law dependence of the calculation of the LLR on the explosive force, taking into account the degree of implementation of the burning rate, the use of which will allow rationalizing the parameters of the D&B when breaking the ore mass using all types of IE.
{"title":"Improvement of the current methodology for calculating the parameters of drilling and blasting on the explosive force","authors":"M. Kononenko, O. Khomenko, A. Kosenko","doi":"10.33271/crpnmu/71.062","DOIUrl":"https://doi.org/10.33271/crpnmu/71.062","url":null,"abstract":"Purpose. Improvement of the current methodology for calculating the parameters of drilling and blasting (D&B) by determining the explosive force by the degree of realization of the detonation velocity for all types of industrial explosives (IE). The methodology of research. To solve the problem, a systematic approach was used, including an analysis of the current industry methodology for calculating the parameters of D&B in underground ore mining using IE, improvement of the power-law dependence of the calculation of the line of least resistance (LLR) of charges by determining the coefficient of explosive force of the IE, taking into account the degree of implementation of the burning rate, as well as approbation of the improved technique in the conditions of the operating iron ore mine. Findings. According to the methodology for determining the coefficient of explosive force of explosives (EX) according to the degree of implementation of the burning rate and according to the results of experimental studies of the change in the burning rate of the bulk emulsion explosive (EE) Ukrainit-PP-2, an improvement is proposed for the current industry methodology for calculating the parameters of D&B for the mines of the Kriviy Rig basin and the Private Joint Stock Society \"Zaporozhye iron ore plant\" (PJSS \"ZIOP\"). This made it possible, in the conditions of the experimental block of the mine \"Yubileinaya\" of the PJSS \"Sukhaya Balka\", using the bulk EE Ukrainit-PP-2, to increase the LLR and the distance between the borehole bottom up to 17%, and to obtain good results of ore reduction. The originality. The well-known power-law dependence of the determination of the LLR of borehole for rock breaking has been improved through the refinement of the coefficient of explosive force of the IE, which takes into account the degree of realization of the burning rate EX. Practical implications. The results of the research have improved the power-law dependence of the calculation of the LLR on the explosive force, taking into account the degree of implementation of the burning rate, the use of which will allow rationalizing the parameters of the D&B when breaking the ore mass using all types of IE.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86039264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Aziukovskyi, V. Gristchak, K. Ziborov, S. Fedoriachenko, T. Kravchuk
Purpose. Critical infrastructure facilities, including pipelines and tanks, are an integral part of ensuring the functioning of industrial and civil life support facilities. External factors that may affect their functioning can be both the cause of force majeure and targeted actions by third parties. Therefore, the purpose of this work is to establish a mathematical description of the dynamic behavior of cylindrical shells under the action of a local impulse caused by internal pressure. Methodology. To achieve the goal of the work, the provisions of the nonlinear dynamics of the system of forces are applied, taking into account approximate analytical and asymptotic methods. Results. The results obtained make it possible to describe nonlinear processes caused by local pulses of internal pressure in shell systems, which can be interpolated for use in numerous methods for determining the parameters of the strength and bearing capacity of the corresponding structure, taking into account the physical and mechanical parameters of the materials used and the nature of the force action. Interpolation of the results to similar technical systems will allow scaling the mathematical approach in solving engineering problems. Scientific novelty. The existing dynamic models are mostly represented by simplified calculation models without taking into account the totality of real loads and characteristic design and technological factors. In this paper, it is proposed to take into account the nonlinearity of dynamic processes due to the shape of the impulse action, the power exponent of the nonlinearity of displacements, and the Dirac delta function. This approach is new of scientific and practical significance. Practical significance. The resulting singular inhomogeneous model of interaction in the form of a differential equation with variable coefficients makes it possible to provide numerical simulation of interaction processes with asymptotically approximate results and to establish the parameters of dynamic behavior to impulse action. As a result, it is possible to obtain new technical solutions for shell structures resistant to dynamic impact, which will have improved technical and operational characteristics.
{"title":"On the problem of nonlinear dynamics of shell systems influenced by the internal pressure local impulse","authors":"O. Aziukovskyi, V. Gristchak, K. Ziborov, S. Fedoriachenko, T. Kravchuk","doi":"10.33271/crpnmu/71.179","DOIUrl":"https://doi.org/10.33271/crpnmu/71.179","url":null,"abstract":"Purpose. Critical infrastructure facilities, including pipelines and tanks, are an integral part of ensuring the functioning of industrial and civil life support facilities. External factors that may affect their functioning can be both the cause of force majeure and targeted actions by third parties. Therefore, the purpose of this work is to establish a mathematical description of the dynamic behavior of cylindrical shells under the action of a local impulse caused by internal pressure. Methodology. To achieve the goal of the work, the provisions of the nonlinear dynamics of the system of forces are applied, taking into account approximate analytical and asymptotic methods. Results. The results obtained make it possible to describe nonlinear processes caused by local pulses of internal pressure in shell systems, which can be interpolated for use in numerous methods for determining the parameters of the strength and bearing capacity of the corresponding structure, taking into account the physical and mechanical parameters of the materials used and the nature of the force action. Interpolation of the results to similar technical systems will allow scaling the mathematical approach in solving engineering problems. Scientific novelty. The existing dynamic models are mostly represented by simplified calculation models without taking into account the totality of real loads and characteristic design and technological factors. In this paper, it is proposed to take into account the nonlinearity of dynamic processes due to the shape of the impulse action, the power exponent of the nonlinearity of displacements, and the Dirac delta function. This approach is new of scientific and practical significance. Practical significance. The resulting singular inhomogeneous model of interaction in the form of a differential equation with variable coefficients makes it possible to provide numerical simulation of interaction processes with asymptotically approximate results and to establish the parameters of dynamic behavior to impulse action. As a result, it is possible to obtain new technical solutions for shell structures resistant to dynamic impact, which will have improved technical and operational characteristics.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84657066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose of work is to research and design process optimization and optimal operational management for a two-stage technological line. Methodology. To achieve the goal, we apply a comprehensive approach, which consists of the formalization and analysis of operational management tasks and technological lines designing.The methods of probability theory are used to determine the optimal level between the maximum bandwidths of the stages of the technological lines and for processing mathematical models of random variables. Research results. The need for a system-wide approach to the management of two-stage technological lines is substantiated, which involves joint consideration of design and operational management tasks. Three optimization problems are considered, which differ in their formulation by initial data, goals and optimization parameters.This is the problem of design optimization when creating equipment, the problem of optimal design of technological schemes and the problem of optimal operational control.These three types of tasks must be considered comprehensively, in mutual connection to achieve a global optimum in terms of the economic criterion.The formalization of such a complex problem for two-stage technological schemes was carried out in a general form and approaches to its solution. The methodology for solving such problems is proposed, based on information about the specific consumption of the resource and the characteristics of the flow of the processed material. Scientific novelty. The formulation of the complex optimization problem for the functioning of two-stage technological lines, including the choice of the equipment and a type of operational management, and a solving approach for the considered problem was provided. Practical significance of work results. The proposed approach makes it possible to find the optimal solution to the problem of management and design of two-stage technological lines from the point of view of the economic criterion.
{"title":"System approach in optimal management problems for two-stage technological lines","authors":"I. Novitskyi, V. Sliesariev, Y. Shevchenko","doi":"10.33271/crpnmu/71.222","DOIUrl":"https://doi.org/10.33271/crpnmu/71.222","url":null,"abstract":"Purpose of work is to research and design process optimization and optimal operational management for a two-stage technological line. Methodology. To achieve the goal, we apply a comprehensive approach, which consists of the formalization and analysis of operational management tasks and technological lines designing.The methods of probability theory are used to determine the optimal level between the maximum bandwidths of the stages of the technological lines and for processing mathematical models of random variables. Research results. The need for a system-wide approach to the management of two-stage technological lines is substantiated, which involves joint consideration of design and operational management tasks. Three optimization problems are considered, which differ in their formulation by initial data, goals and optimization parameters.This is the problem of design optimization when creating equipment, the problem of optimal design of technological schemes and the problem of optimal operational control.These three types of tasks must be considered comprehensively, in mutual connection to achieve a global optimum in terms of the economic criterion.The formalization of such a complex problem for two-stage technological schemes was carried out in a general form and approaches to its solution. The methodology for solving such problems is proposed, based on information about the specific consumption of the resource and the characteristics of the flow of the processed material. Scientific novelty. The formulation of the complex optimization problem for the functioning of two-stage technological lines, including the choice of the equipment and a type of operational management, and a solving approach for the considered problem was provided. Practical significance of work results. The proposed approach makes it possible to find the optimal solution to the problem of management and design of two-stage technological lines from the point of view of the economic criterion.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84883473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ya Yaroshenko, O. Bobrov, D. Tsyplenkov, V. Kuznetsov, O. Savvin
Purpose. Analysis of the state of energy storage systems in the world, determination of prospects for their development and comparison of electricity storage methods. Research methodology. Theoretical justification and comparison of electricity storage systems taking into account the real indicators of the energy system of Ukraine as of the end of 2021. The results. Show that there is a need for a theoretical and practical approach to the implementation of storage capacities in order to maintain the balance of the electric power system. As a result of the review of the most common electricity storage devices, their features as a whole were highlighted. All of them have both advantages and disadvantages. However, in a comprehensive approach to their promotion, it is possible to obtain the greatest expected result. The most promising, from the point of view of the chain: environmental friendliness - cost - relevance - necessity, is – hydrogen. Scientific novelty. Is that the possibility of combined use of various types of battery systems with different characteristics is being considered. Practical value. The possibility of introducing battery capacities at the industrial level for more effective decentralization of the state's energy sector. Today, without the necessary infrastructure, re-equipment of existing energy-receiving and distribution stations, large-scale investments, hydrogen cannot become effective, as much as it is capable, because energy must move from the wire to the gas, and then back to the wire. That is, there is a certain vector of energy that is constantly in a "transitional" position. That is why the energy efficiency at each of the levels of converting hydrogen into electricity drops. Efficiency, under normal, normal conditions of "yesterday's" day in this case will be about 80%. To transport hydrogen, it is necessary to compress and cool it. This process takes up to 10-15% of energy. For further transformation into electrical energy, thermal energy is consumed, and as a result, electricity can be obtained with an efficiency of ~65-70%.
{"title":"Electricity storage systems","authors":"Ya Yaroshenko, O. Bobrov, D. Tsyplenkov, V. Kuznetsov, O. Savvin","doi":"10.33271/crpnmu/71.131","DOIUrl":"https://doi.org/10.33271/crpnmu/71.131","url":null,"abstract":"Purpose. Analysis of the state of energy storage systems in the world, determination of prospects for their development and comparison of electricity storage methods. Research methodology. Theoretical justification and comparison of electricity storage systems taking into account the real indicators of the energy system of Ukraine as of the end of 2021. The results. Show that there is a need for a theoretical and practical approach to the implementation of storage capacities in order to maintain the balance of the electric power system. As a result of the review of the most common electricity storage devices, their features as a whole were highlighted. All of them have both advantages and disadvantages. However, in a comprehensive approach to their promotion, it is possible to obtain the greatest expected result. The most promising, from the point of view of the chain: environmental friendliness - cost - relevance - necessity, is – hydrogen. Scientific novelty. Is that the possibility of combined use of various types of battery systems with different characteristics is being considered. Practical value. The possibility of introducing battery capacities at the industrial level for more effective decentralization of the state's energy sector. Today, without the necessary infrastructure, re-equipment of existing energy-receiving and distribution stations, large-scale investments, hydrogen cannot become effective, as much as it is capable, because energy must move from the wire to the gas, and then back to the wire. That is, there is a certain vector of energy that is constantly in a \"transitional\" position. That is why the energy efficiency at each of the levels of converting hydrogen into electricity drops. Efficiency, under normal, normal conditions of \"yesterday's\" day in this case will be about 80%. To transport hydrogen, it is necessary to compress and cool it. This process takes up to 10-15% of energy. For further transformation into electrical energy, thermal energy is consumed, and as a result, electricity can be obtained with an efficiency of ~65-70%.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77456439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Features of mechanical processing of wear-resistant cast iron","authors":"V. Derbaba, S. Patsera, V. Hryhorenko","doi":"10.33271/crpnmu/71.217","DOIUrl":"https://doi.org/10.33271/crpnmu/71.217","url":null,"abstract":"","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80623468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose of work isan improvement of the controlling efficiency for the processes of self-grinding ores in drum mills by using adaptive settings for the perimeters of the control part of the system. Methodology. For the self-grinding process, the degree of filling of the mill drum is a critical technological variable, i.e. this parameter not only has a direct impact on the efficiency of the grinding unit in terms of the newly formed finished product, but also determines the trouble-free operation of the mill.It is known from the referenced literature that during thedecay time of the autocorrelation function for the processes of original ore’s main characteristics change is on the order of several hours or more. At the same time, the inertia of the crushed aggregate is measured in tens of minutes. Under such conditions, one should assume that quasi-stationarity and the rational use of the control system for a wide scope of self-grinding take place. Research results. Using the method of auxiliary operators, the law for setting the parameters of the main circuit of the self-adjusting system was generated, and the block diagrams of the adaptive control system for filling ore self-grinding mills were determined. The transient processes in the control system are calculated, which proves the expediency and effectiveness of the proposed approach. Scientific novelty. A new approach is proposed using an adaptive control system to regulate the degree of filling of autogenous ores mills, based on the use of the method of auxiliary operators. Practical significance. While calculating the tuning processes in the control system for the filling degree of the mill, it was found that even with a simultaneous abrupt change in the object’s parameters K0,T1,T2to the maximum value, the adaptive system completes tuning the parameters of the controllerC1, C2, C3 for a time of about 230 ÷ 270 minutes, which indicates the practical feasibility and effectiveness of this approach to control the filling level of ore self-grinding mills.
{"title":"Self-adjusting filling control system forself-grinding drum mills","authors":"I. Novitskyi, V. Sliesariev, Y. Shevchenko","doi":"10.33271/crpnmu/71.203","DOIUrl":"https://doi.org/10.33271/crpnmu/71.203","url":null,"abstract":"Purpose of work isan improvement of the controlling efficiency for the processes of self-grinding ores in drum mills by using adaptive settings for the perimeters of the control part of the system. Methodology. For the self-grinding process, the degree of filling of the mill drum is a critical technological variable, i.e. this parameter not only has a direct impact on the efficiency of the grinding unit in terms of the newly formed finished product, but also determines the trouble-free operation of the mill.It is known from the referenced literature that during thedecay time of the autocorrelation function for the processes of original ore’s main characteristics change is on the order of several hours or more. At the same time, the inertia of the crushed aggregate is measured in tens of minutes. Under such conditions, one should assume that quasi-stationarity and the rational use of the control system for a wide scope of self-grinding take place. Research results. Using the method of auxiliary operators, the law for setting the parameters of the main circuit of the self-adjusting system was generated, and the block diagrams of the adaptive control system for filling ore self-grinding mills were determined. The transient processes in the control system are calculated, which proves the expediency and effectiveness of the proposed approach. Scientific novelty. A new approach is proposed using an adaptive control system to regulate the degree of filling of autogenous ores mills, based on the use of the method of auxiliary operators. Practical significance. While calculating the tuning processes in the control system for the filling degree of the mill, it was found that even with a simultaneous abrupt change in the object’s parameters K0,T1,T2to the maximum value, the adaptive system completes tuning the parameters of the controllerC1, C2, C3 for a time of about 230 ÷ 270 minutes, which indicates the practical feasibility and effectiveness of this approach to control the filling level of ore self-grinding mills.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80464508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Felonenko, V. Gubkina, O. Tverdokhlib, O. Trofymova
Purpose. To carry out the studies of proposed options for overlapping to support excavation roof and ensure roof maintenance to avoid collapse and protect people and mechanisms. To study a specified goal, an expert assessment of the existing tools to maintain roof rocks in the working area where people and mechanisms are engaged has been carried out. Methodology consists in applying software and computer simulation of interaction processes of mining rocks with arched design options. Findings. A short analysis of the most commonly applied structures to provide temporary fastening of preparatory and permanent mine workings has been carried out. The options for a roof design and the elements for temporary fastening are proposed. The parameters for four sectional overlapping have been substantiated. The loads acting on the roof-supporting structure and the coefficients required to determine the rock loads, the strength of some roof layers and "soil" as well as the forces in the rack hydraulic cylinder have been calculated. Originality. Applying temporary arched fastening in the working area of a tunneling machine promotes reducing a number of technological operations and manual labor employment as well as enhancing maintenance personnel safety. The speed of tunneling works is supposed to increase. Practical value. It is based on the analysis of a selective heading machine performance with an easily collapsed roof, study results to achieve a constructive machine improvement are presented. Its components may vary depending on mining and geological conditions of the work. The obtained parameters are verified by calculations and design solutions. The minimum mass of the fastening that provides both rigidity and strength of the structure is significantly reduced. Obtained results can be applied in underground tunneling and other similar works as well as in constructing roads and railways. The design of the device gives the possibility to adjust the height depending on the mine roof condition.
{"title":"Substantiating rational parameters for a stull-timbered device of the selective heading machine","authors":"S. Felonenko, V. Gubkina, O. Tverdokhlib, O. Trofymova","doi":"10.33271/crpnmu/71.104","DOIUrl":"https://doi.org/10.33271/crpnmu/71.104","url":null,"abstract":"Purpose. To carry out the studies of proposed options for overlapping to support excavation roof and ensure roof maintenance to avoid collapse and protect people and mechanisms. To study a specified goal, an expert assessment of the existing tools to maintain roof rocks in the working area where people and mechanisms are engaged has been carried out. Methodology consists in applying software and computer simulation of interaction processes of mining rocks with arched design options. Findings. A short analysis of the most commonly applied structures to provide temporary fastening of preparatory and permanent mine workings has been carried out. The options for a roof design and the elements for temporary fastening are proposed. The parameters for four sectional overlapping have been substantiated. The loads acting on the roof-supporting structure and the coefficients required to determine the rock loads, the strength of some roof layers and \"soil\" as well as the forces in the rack hydraulic cylinder have been calculated. Originality. Applying temporary arched fastening in the working area of a tunneling machine promotes reducing a number of technological operations and manual labor employment as well as enhancing maintenance personnel safety. The speed of tunneling works is supposed to increase. Practical value. It is based on the analysis of a selective heading machine performance with an easily collapsed roof, study results to achieve a constructive machine improvement are presented. Its components may vary depending on mining and geological conditions of the work. The obtained parameters are verified by calculations and design solutions. The minimum mass of the fastening that provides both rigidity and strength of the structure is significantly reduced. Obtained results can be applied in underground tunneling and other similar works as well as in constructing roads and railways. The design of the device gives the possibility to adjust the height depending on the mine roof condition.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90212086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Ishkov, Ye.S. Kozii, O. Chernobuk, M. Kozar, O. Dreshpak
Purpose. To establish and analyze the relationship between the concentrations of germanium and toxic elements and the sulfur content of the general coal seam с8нof the Dniprovska mine. Methodology. The factual basis of the work was the results of 370 analyzes of germanium, beryllium, fluorine, mercury and arsenic and total sulfur in the central certified laboratories of production geological exploration organizations of Ukraine from the material of reservoir samples obtained by production and research enterprises and organizations. Ge content was determined by quantitative emission spectral analysis. The quality of the results of the analyzes (correctness and reproducibility) was evaluated as the significance of the mean systematic error, which was tested using the Student's criterion, and the significance of the mean random error, which was tested using the Fisher criterion. At the initial stage of primary geochemical information processing, the values of the main descriptive statistical indicators were calculated using the STATISTICA 13.3 and IBM SPSS Statistics 22 programs, the frequency histograms of Ge content and reservoir thickness were constructed, and the characteristics of the distribution of these parameters were established. To achieve the goal set in the work, in the research process, correlation and regression analysis was carried out using the methods implemented in the most popular professional statistical software platforms "STATISTICA" and "SPSS" and their analysis was performed in geological terms. Findigs. In the work, the regularities of the relationship between the concentration of germanium and the content of toxic elements and total sulfur in the coal seam с8нof the Dniprovska mine are established. Inherent to the considered impurity elements, the general diverse form of their presence in coal allows us to treat the regularities established with the help of correlation and regression analysis as a kind of trend of dependencies between them, which was realized in the specific geological conditions of the с8нseam of the Dniprovska mine. Scientific novelty. It consists in establishing the non-compliance of the samples of all considered elements with the normal or lognormal distribution law, while in all cases the polymodality of the distribution of indicators is recorded, which is confirmed by analytical calculations of the correspondence of the empirical distributions of the studied parameters of the Gaussian distribution using the Kolmogorov-Smirnov, Shapiro-Wilk, Lilliefors criteria and Pearson's хі-square agreement. Practical significance. It consists in the fact that for a more realistic assessment of the central tendency of the content of Ge and toxic elements and total sulfur, it is necessary to use the median values instead of the values of the arithmetic mean. It was established that there is a very low correlation between the concentrations of germanium and toxic elements and total sulfur, therefore, the extraction
{"title":"About relationship between germanium concentration and the content of toxic elements and total sulfur in the coal seam c8h of the Dniprovska mine","authors":"V. Ishkov, Ye.S. Kozii, O. Chernobuk, M. Kozar, O. Dreshpak","doi":"10.33271/crpnmu/71.145","DOIUrl":"https://doi.org/10.33271/crpnmu/71.145","url":null,"abstract":"Purpose. To establish and analyze the relationship between the concentrations of germanium and toxic elements and the sulfur content of the general coal seam с8нof the Dniprovska mine. Methodology. The factual basis of the work was the results of 370 analyzes of germanium, beryllium, fluorine, mercury and arsenic and total sulfur in the central certified laboratories of production geological exploration organizations of Ukraine from the material of reservoir samples obtained by production and research enterprises and organizations. Ge content was determined by quantitative emission spectral analysis. The quality of the results of the analyzes (correctness and reproducibility) was evaluated as the significance of the mean systematic error, which was tested using the Student's criterion, and the significance of the mean random error, which was tested using the Fisher criterion. At the initial stage of primary geochemical information processing, the values of the main descriptive statistical indicators were calculated using the STATISTICA 13.3 and IBM SPSS Statistics 22 programs, the frequency histograms of Ge content and reservoir thickness were constructed, and the characteristics of the distribution of these parameters were established. To achieve the goal set in the work, in the research process, correlation and regression analysis was carried out using the methods implemented in the most popular professional statistical software platforms \"STATISTICA\" and \"SPSS\" and their analysis was performed in geological terms. Findigs. In the work, the regularities of the relationship between the concentration of germanium and the content of toxic elements and total sulfur in the coal seam с8нof the Dniprovska mine are established. Inherent to the considered impurity elements, the general diverse form of their presence in coal allows us to treat the regularities established with the help of correlation and regression analysis as a kind of trend of dependencies between them, which was realized in the specific geological conditions of the с8нseam of the Dniprovska mine. Scientific novelty. It consists in establishing the non-compliance of the samples of all considered elements with the normal or lognormal distribution law, while in all cases the polymodality of the distribution of indicators is recorded, which is confirmed by analytical calculations of the correspondence of the empirical distributions of the studied parameters of the Gaussian distribution using the Kolmogorov-Smirnov, Shapiro-Wilk, Lilliefors criteria and Pearson's хі-square agreement. Practical significance. It consists in the fact that for a more realistic assessment of the central tendency of the content of Ge and toxic elements and total sulfur, it is necessary to use the median values instead of the values of the arithmetic mean. It was established that there is a very low correlation between the concentrations of germanium and toxic elements and total sulfur, therefore, the extraction ","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83134851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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