Pub Date : 2023-11-06DOI: 10.24425/AME.2020.131704
M. F. Al-Samieh
{"title":"Ridge geometry effect on the behavior of elastohydrodynamic lubrication of point contact problem","authors":"M. F. Al-Samieh","doi":"10.24425/AME.2020.131704","DOIUrl":"https://doi.org/10.24425/AME.2020.131704","url":null,"abstract":"","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945248","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}
Pub Date : 2023-11-06DOI: 10.24425/AME.2020.131682
A. Szklarski, R. Glebocki, M. Jacewicz
The modified configuration of the 155 mm rocket assisted projectile equipped with lateral thrusters was proposed. Six degree of freedom mathematical model was used to investigate the quality of the considered projectile. Impact point prediction guidance scheme intended for low control authority projectile was developed to minimize the dispersion radius. Simple point mass model was applied to calculate the impact point coordinates during the flight. Main motor time delay impact on range characteristics was investigated. Miss distance errors and Circular Error Probable for various lateral thruster total impulse were obtained. Monte-Carlo simulations proved that the impact point dispersion could be reduced significantly when the circular array of 15 solid propellant lateral thrusters was used. Single motor operation time was set to be 0.025 s. Finally, the warhead radii of destruction were analyzed.
{"title":"Impact point prediction guidance parametric study for 155 mm rocket assisted artillery projectile with lateral thrusters","authors":"A. Szklarski, R. Glebocki, M. Jacewicz","doi":"10.24425/AME.2020.131682","DOIUrl":"https://doi.org/10.24425/AME.2020.131682","url":null,"abstract":"The modified configuration of the 155 mm rocket assisted projectile equipped with lateral thrusters was proposed. Six degree of freedom mathematical model was used to investigate the quality of the considered projectile. Impact point prediction guidance scheme intended for low control authority projectile was developed to minimize the dispersion radius. Simple point mass model was applied to calculate the impact point coordinates during the flight. Main motor time delay impact on range characteristics was investigated. Miss distance errors and Circular Error Probable for various lateral thruster total impulse were obtained. Monte-Carlo simulations proved that the impact point dispersion could be reduced significantly when the circular array of 15 solid propellant lateral thrusters was used. Single motor operation time was set to be 0.025 s. Finally, the warhead radii of destruction were analyzed.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944915","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}
Pub Date : 2023-11-06DOI: 10.24425/AME.2020.131683
N. Muralidhar, K. Vadivuchezhian, V. Arumugam, I. S. Reddy
Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28 ◦ C to 120 ◦ C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105 ◦ C. The elastic modulus calculated from the DMA data is compared with three point bending test.
{"title":"Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber","authors":"N. Muralidhar, K. Vadivuchezhian, V. Arumugam, I. S. Reddy","doi":"10.24425/AME.2020.131683","DOIUrl":"https://doi.org/10.24425/AME.2020.131683","url":null,"abstract":"Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28 ◦ C to 120 ◦ C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105 ◦ C. The elastic modulus calculated from the DMA data is compared with three point bending test.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944960","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}
Pub Date : 2023-11-06DOI: 10.24425/AME.2020.131686
Łukasz Woliński
This paper deals with two control algorithms which utilize learning of their models’ parameters. An adaptive and artificial neural network control techniques are described and compared. Both control algorithms are implemented in MATLAB and Simulink environment, and they are used in the simulation of a postion control of the LWR 4+ manipulator subjected to unknown disturbances. The results, showing the better performance of the artificial neural network controller, are shown. Advantages and disadvantages of both controllers are discussed. The usefulness of the learning algorithms for the control of LWR 4+ robots is discussed. Preliminary experiments dealing with dynamic properties of the two LWR 4+ robots are reported.
{"title":"Comparison of the adaptive and neural network control for LWR 4+ manipulators: simulation study","authors":"Łukasz Woliński","doi":"10.24425/AME.2020.131686","DOIUrl":"https://doi.org/10.24425/AME.2020.131686","url":null,"abstract":"This paper deals with two control algorithms which utilize learning of their models’ parameters. An adaptive and artificial neural network control techniques are described and compared. Both control algorithms are implemented in MATLAB and Simulink environment, and they are used in the simulation of a postion control of the LWR 4+ manipulator subjected to unknown disturbances. The results, showing the better performance of the artificial neural network controller, are shown. Advantages and disadvantages of both controllers are discussed. The usefulness of the learning algorithms for the control of LWR 4+ robots is discussed. Preliminary experiments dealing with dynamic properties of the two LWR 4+ robots are reported.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945028","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}
Pub Date : 2023-11-06DOI: 10.24425/ame.2007.131559
F. Chwarścianek
{"title":"Kinematic model for forming dough into cylindrical shapes","authors":"F. Chwarścianek","doi":"10.24425/ame.2007.131559","DOIUrl":"https://doi.org/10.24425/ame.2007.131559","url":null,"abstract":"","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"39 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135724061","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}
Pub Date : 2023-11-06DOI: 10.24425/ame.2008.131631
T. Kopecki
The paper presents the methodology that makes it possible to evaluate computational model and introduce current corrections to it. The methodology ensures proper interpretation of nonlinear results of numerical analyses of thin-walled structures. The suggested methodology is based on carrying out, in parallel to nonlinear numerical analysis, experimental research on some selected crucial zones of load-carrying structures. Attention is drawn to the determinants concerning the perfor-mance of an adequate experiment. The author points out on indicating the role of model tests as a fast and economically justified research instruments practicable when designing thin-walled load-carrying structures. The presented considerations are illustrated by an example of a structure whose geometrical complexity and ranges of deformation are characteristic for modern solutions applied in the load-carrying structures of airframes. As the representative example, one selected the area of the load-carrying structure that contains an extensive cut-out, in which the highest levels and stress gradients occur in the conditions of torsion evoking the post-buckling states within the permissible loads. The stress distributions within these ranges of deformations were used as the basis for determining the fatigue life of the structure.
{"title":"Coupling experiment and numerical analysis in the study of post-buckling response of thin-walled structures","authors":"T. Kopecki","doi":"10.24425/ame.2008.131631","DOIUrl":"https://doi.org/10.24425/ame.2008.131631","url":null,"abstract":"The paper presents the methodology that makes it possible to evaluate computational model and introduce current corrections to it. The methodology ensures proper interpretation of nonlinear results of numerical analyses of thin-walled structures. The suggested methodology is based on carrying out, in parallel to nonlinear numerical analysis, experimental research on some selected crucial zones of load-carrying structures. Attention is drawn to the determinants concerning the perfor-mance of an adequate experiment. The author points out on indicating the role of model tests as a fast and economically justified research instruments practicable when designing thin-walled load-carrying structures. The presented considerations are illustrated by an example of a structure whose geometrical complexity and ranges of deformation are characteristic for modern solutions applied in the load-carrying structures of airframes. As the representative example, one selected the area of the load-carrying structure that contains an extensive cut-out, in which the highest levels and stress gradients occur in the conditions of torsion evoking the post-buckling states within the permissible loads. The stress distributions within these ranges of deformations were used as the basis for determining the fatigue life of the structure.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"39 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135724063","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}
The development of industry is determined by the use of modern materials in the production of parts and equipment. In recent years, there has been a significant increase in the use of nickel-based superalloys in the aerospace, energy and space industries. Due to their properties, these alloys belong to the group of materials hard-to-machine with conventional methods. One of the non-conventional manufacturing technologies that allow the machining of geometrically complex parts from nickel-based superalloys is electrical discharge machining. The article presents the results of experimental investigations of the impact of EDM parameters on the surfaces roughness and the material removal rate. Based on the results of empirical research, mathematical models of the EDM process were developed, which allow for the selection of the most favourable processing parameters for the expected values of the surface roughness Sa and the material removal rate.
{"title":"Electrical discharge machining of difficult to cut materials","authors":"Rafał Świercz, Dorota Oniszczuk-Świercz, Lucjan Dąbrowski","doi":"10.24425/ame.2018.125437","DOIUrl":"https://doi.org/10.24425/ame.2018.125437","url":null,"abstract":"The development of industry is determined by the use of modern materials in the production of parts and equipment. In recent years, there has been a significant increase in the use of nickel-based superalloys in the aerospace, energy and space industries. Due to their properties, these alloys belong to the group of materials hard-to-machine with conventional methods. One of the non-conventional manufacturing technologies that allow the machining of geometrically complex parts from nickel-based superalloys is electrical discharge machining. The article presents the results of experimental investigations of the impact of EDM parameters on the surfaces roughness and the material removal rate. Based on the results of empirical research, mathematical models of the EDM process were developed, which allow for the selection of the most favourable processing parameters for the expected values of the surface roughness Sa and the material removal rate.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"13 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544611","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}
Pub Date : 2023-11-06DOI: 10.24425/ame.2009.132110
L. Dietrich, A. Rutecka, Z. L. Kowalewski
In spite of the great progress in modelling of material behaviour achieved during last decade, there is still a necessity to determine a model which would describe complex material processes more accurately. Among many problems to be solved, a proper model selection and its verification on the basis of experimental data seems to be the most important nowadays. Since the creep and fatigue mechanisms differ from each other, it is important to perform experiment on both kinds of mechanisms to be able to verify models. The paper presents the creep and LCF results of the AlSi8Cu3 and AlSi7MgCu0.5 cast aluminium alloys. For both materials, two levels of porosity were considered. Low porosity material (melt) was degassed during production to achieve the density index less than 3%. The high porosity material was not degassed in order to enlarge the density index up to a value higher than 6%. Up to now, many efforts are made to carry out investigations whose main objective is to find such a parameter, which would allow for describing a dam-
{"title":"Assessment of exploitation properties of cast aluminium alloys on the basis of creep and LCF investigations","authors":"L. Dietrich, A. Rutecka, Z. L. Kowalewski","doi":"10.24425/ame.2009.132110","DOIUrl":"https://doi.org/10.24425/ame.2009.132110","url":null,"abstract":"In spite of the great progress in modelling of material behaviour achieved during last decade, there is still a necessity to determine a model which would describe complex material processes more accurately. Among many problems to be solved, a proper model selection and its verification on the basis of experimental data seems to be the most important nowadays. Since the creep and fatigue mechanisms differ from each other, it is important to perform experiment on both kinds of mechanisms to be able to verify models. The paper presents the creep and LCF results of the AlSi8Cu3 and AlSi7MgCu0.5 cast aluminium alloys. For both materials, two levels of porosity were considered. Low porosity material (melt) was degassed during production to achieve the density index less than 3%. The high porosity material was not degassed in order to enlarge the density index up to a value higher than 6%. Up to now, many efforts are made to carry out investigations whose main objective is to find such a parameter, which would allow for describing a dam-","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"10 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544906","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}
Pub Date : 2023-11-06DOI: 10.24425/ame.2018.125438
M. Dumitriu
To study the impact of suspended equipment on the ride comfort in a railway vehicle, a rigid flexible general model of such a vehicle is required. The numerical simulations is based on two different models, derived from the general model of the vehicle, namely a reference model of a vehicle with no equipment, and another model with six suspended elements of equipment mounted in various positions along the carbody. The objective of this paper arises from the observation that the literature does not contain any study that highlights the change in the ride comfort resulting exclusively due to the influence of equipment. The influence of the suspended equipment on the ride comfort is determined by comparing the ride comfort indices calculated in the carbody reference points, at the centre and above the two bogies, for a model with six elements of equipment and a model of the vehicle with no equipment.
{"title":"Numerical analysis on the influence of suspended equipment on the ride comfort in railway vehicles","authors":"M. Dumitriu","doi":"10.24425/ame.2018.125438","DOIUrl":"https://doi.org/10.24425/ame.2018.125438","url":null,"abstract":"To study the impact of suspended equipment on the ride comfort in a railway vehicle, a rigid flexible general model of such a vehicle is required. The numerical simulations is based on two different models, derived from the general model of the vehicle, namely a reference model of a vehicle with no equipment, and another model with six suspended elements of equipment mounted in various positions along the carbody. The objective of this paper arises from the observation that the literature does not contain any study that highlights the change in the ride comfort resulting exclusively due to the influence of equipment. The influence of the suspended equipment on the ride comfort is determined by comparing the ride comfort indices calculated in the carbody reference points, at the centre and above the two bogies, for a model with six elements of equipment and a model of the vehicle with no equipment.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"23 59","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545881","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}
Pub Date : 2023-11-06DOI: 10.24425/ame.2021.137045
Udaya P. Singh
The present theoretical study is concerned with the analysis of surface roughness effects on the steady state performance of stepped circular hydrostatic thrust bearings lubricated with non-Newtonian Rabinowitsch fluids. To take the effects of surface roughness into account, Christensen theory of rough surface has been adopted. Expression for pressure gradient has been derived by means of energy integral approach. Results for film pressure, load carrying capacity and lubricant flow rate has been plotted and analysed on the basis of numerical results. Significant variations in the theoretical results of these properties have been observed.
{"title":"Effect of surface roughness on steady performance of hydrostatic thrust bearings: Rabinowitsch fluids","authors":"Udaya P. Singh","doi":"10.24425/ame.2021.137045","DOIUrl":"https://doi.org/10.24425/ame.2021.137045","url":null,"abstract":"The present theoretical study is concerned with the analysis of surface roughness effects on the steady state performance of stepped circular hydrostatic thrust bearings lubricated with non-Newtonian Rabinowitsch fluids. To take the effects of surface roughness into account, Christensen theory of rough surface has been adopted. Expression for pressure gradient has been derived by means of energy integral approach. Results for film pressure, load carrying capacity and lubricant flow rate has been plotted and analysed on the basis of numerical results. Significant variations in the theoretical results of these properties have been observed.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"33 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135584137","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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