Pub Date : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.286
M. Vasić
This paper goal was to increase the quality of the drying ware and to lower the drying scarp rate in one local brick factory. The registration of drying air parameters (temperature, humidity and velocity) along the dryer channels as well as the drying ware linear shrinkage and mass change were monitored for a month. Material and Energy balances were also recorded. Results have revealed that the drying air humidity and temperature profiles were not evenly distributed along the height of the drying tunnels. The ambient air breakthrough into the dryer was experimentally identified and quantified. It was the cause of the product quality deterioration and the reason why the critical and residual moisture in some of the products was larger than the desired one. Based on monitored data and mass and energy balances a solution was proposed for preventing the “false” air breakthrough, upgrade of the existing dryer fans and installation of the novel, measuring equipment. A hypothetical solution for increasing the capacity of the dryer, which uses the registered material and energy balances as well as factory management expectation, that the production of 50.000 masonry units per day will be achieved soon, was given also.
{"title":"MONITORING AND ANALYZING THE CLASSICAL COUNTER CURRENT INDUSTRIAL TUNNEL DRYER FOR MASONRY CLAY UNITS","authors":"M. Vasić","doi":"10.54684/ijmmt.2022.14.2.286","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.286","url":null,"abstract":"This paper goal was to increase the quality of the drying ware and to lower the drying scarp rate in one local brick factory. The registration of drying air parameters (temperature, humidity and velocity) along the dryer channels as well as the drying ware linear shrinkage and mass change were monitored for a month. Material and Energy balances were also recorded. Results have revealed that the drying air humidity and temperature profiles were not evenly distributed along the height of the drying tunnels. The ambient air breakthrough into the dryer was experimentally identified and quantified. It was the cause of the product quality deterioration and the reason why the critical and residual moisture in some of the products was larger than the desired one. Based on monitored data and mass and energy balances a solution was proposed for preventing the “false” air breakthrough, upgrade of the existing dryer fans and installation of the novel, measuring equipment. A hypothetical solution for increasing the capacity of the dryer, which uses the registered material and energy balances as well as factory management expectation, that the production of 50.000 masonry units per day will be achieved soon, was given also.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45266700","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.260
M. Stanciu, A. Savin, G. Dobrescu
The sound post is a very important element in the acoustics of musical instruments with strings and bows. This paper presents the experimental investigations regarding the elastic and acoustic properties of the wood used to obtain the sound post. The speed of propagation of sound waves in wood and then the determination of the elastic properties in the longitudinal direction was measured on a number of 12 sound posts made from new and old resonance wood. It was found that the elastic and acoustic properties depend on the degree of aging of the wood. Thus, the longitudinal propagation speed is about 4% higher in samples of freshly processed wood compared to those of aged wood; the longitudinal modulus of elasticity is about 19% lower for aged wood samples.
{"title":"\"ACOUSTIC AND ELASTIC PROPERTIES OF WOOD FOR VIOLIN SOUND POST \"","authors":"M. Stanciu, A. Savin, G. Dobrescu","doi":"10.54684/ijmmt.2022.14.3.260","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.260","url":null,"abstract":"The sound post is a very important element in the acoustics of musical instruments with strings and bows. This paper presents the experimental investigations regarding the elastic and acoustic properties of the wood used to obtain the sound post. The speed of propagation of sound waves in wood and then the determination of the elastic properties in the longitudinal direction was measured on a number of 12 sound posts made from new and old resonance wood. It was found that the elastic and acoustic properties depend on the degree of aging of the wood. Thus, the longitudinal propagation speed is about 4% higher in samples of freshly processed wood compared to those of aged wood; the longitudinal modulus of elasticity is about 19% lower for aged wood samples.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45713451","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.239
A. Sabau, Ion Serbanescu, R. Zăgan
This paper aimed to evaluate the thrust force for a propeller taking into account cavitations, to analyze the dynamic and nautical characteristics of an ROV (Remotely Operated Vehicles). This approach is not a theoretical one, it also has a practical purpose to achieve high-performance propulsion systems with the lowest possible design costs. This is the purpose for which we want to create a viable and high-performance simulation model which allows optimization by numerical analysis, and in the end to make the prototype and perform measurements. The simulation is done in Ansys CFX and uses a 3D model for the propeller and duct of the T100 thruster produced by Blue Robotics. The simulation introduces the cavitation model from Ansys CFX, simplified Rayleigh-Plesset formulation, and we will perform analyses whit important improvements. Taking into account the results obtained in previous author work [1] and information from other scientifical papers, we will test fine discretization mesh in rotor zone to solve the cavitation. Increased resolution for the numerical scheme, two-order schemes for pressure momentum, and turbulence equations. Replacement of k-epsilon turbulence model whit a more performant k-omega model. The obtained results will be analyzed and compared with the experimental measurements.
{"title":"PROPULSION THRUST FORCE CALCULATION WITH CAVITATION FOR AN UNDERWATER VEHICLE","authors":"A. Sabau, Ion Serbanescu, R. Zăgan","doi":"10.54684/ijmmt.2022.14.3.239","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.239","url":null,"abstract":"This paper aimed to evaluate the thrust force for a propeller taking into account cavitations, to analyze the dynamic and nautical characteristics of an ROV (Remotely Operated Vehicles). This approach is not a theoretical one, it also has a practical purpose to achieve high-performance propulsion systems with the lowest possible design costs. This is the purpose for which we want to create a viable and high-performance simulation model which allows optimization by numerical analysis, and in the end to make the prototype and perform measurements. The simulation is done in Ansys CFX and uses a 3D model for the propeller and duct of the T100 thruster produced by Blue Robotics. The simulation introduces the cavitation model from Ansys CFX, simplified Rayleigh-Plesset formulation, and we will perform analyses whit important improvements. Taking into account the results obtained in previous author work [1] and information from other scientifical papers, we will test fine discretization mesh in rotor zone to solve the cavitation. Increased resolution for the numerical scheme, two-order schemes for pressure momentum, and turbulence equations. Replacement of k-epsilon turbulence model whit a more performant k-omega model. The obtained results will be analyzed and compared with the experimental measurements.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43042257","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.27
G. Căpățână, M. A. Potîrniche, D. G. Muscă (Anghelache)
Although it has been neglected in recent years, cultivation is once again finding its place in the field of agricultural crop management. The basic activities carried out by farmers in modern agriculture include plowing, opening the top layer of the soil and mechanical removal of weeds. Tools such as harrows or cultivators are used for these activities. This work presents in the first phase the modeling of a cultivator that can be mounted on an agricultural tractor with a power of up to 20 kW. The 3D model of the cultivator was analyzed in a second phase using a specialized software, Autodesk Inventor Professional 2020. The finite element analysis aimed at highlighting the behavior of the cultivator type equipment during the work process, a very important aspect for the specialists in domain who must permanently ensure that the operation of these machines is carried out at optimal parameters. Following the analysis, the results chosen for visualization were the stresses and deformations of the cultivator's work equipment, as well as the displacements of the structure nodes.
尽管近年来耕作一直被忽视，但它再次在农业作物管理领域找到了自己的位置。在现代农业中，农民的基本活动包括翻耕、开土层和机械除草。锄头或耕犁等工具用于这些活动。这项工作在第一阶段提出了可安装在功率高达20千瓦的农业拖拉机上的耕耘机的建模。在第二阶段，使用专用软件Autodesk Inventor Professional 2020分析耕耘机的3D模型。有限元分析旨在突出耕作型设备在工作过程中的行为，这对该领域的专家来说是一个非常重要的方面，他们必须始终确保这些机器在最佳参数下运行。在分析之后，选择用于可视化的结果是耕耘机工作设备的应力和变形，以及结构节点的位移。
{"title":"CONSIDERATIONS REGARDING 3D MODELLING AND FINITE ELEMENT ANALYSIS OF A CULTIVATOR TYPE EQUIPMENT","authors":"G. Căpățână, M. A. Potîrniche, D. G. Muscă (Anghelache)","doi":"10.54684/ijmmt.2022.14.3.27","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.27","url":null,"abstract":"Although it has been neglected in recent years, cultivation is once again finding its place in the field of agricultural crop management. The basic activities carried out by farmers in modern agriculture include plowing, opening the top layer of the soil and mechanical removal of weeds. Tools such as harrows or cultivators are used for these activities. This work presents in the first phase the modeling of a cultivator that can be mounted on an agricultural tractor with a power of up to 20 kW. The 3D model of the cultivator was analyzed in a second phase using a specialized software, Autodesk Inventor Professional 2020. The finite element analysis aimed at highlighting the behavior of the cultivator type equipment during the work process, a very important aspect for the specialists in domain who must permanently ensure that the operation of these machines is carried out at optimal parameters. Following the analysis, the results chosen for visualization were the stresses and deformations of the cultivator's work equipment, as well as the displacements of the structure nodes.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48614118","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.38
E. Chiba, M. Abdelkrim, A. Belloufi, I. Rezgui
The wheels and rails of the train, tram etc. are often verified from their microstructure and plastic deformation, which usually appear in the outer layer of a wheel and rail, to analyse the causes of geometrical defects by monitoring the applied loads and variation of the temperature as suggested in the literature. This paper studies the effect of thermal stress applied with variations of the loads in contact on wheel/rail for the tramway, tracking through the state of the rail to discover the causes of geometric defects started by temperature variations and loads, and applying these variations of temperature and loads to know its resistance to these climatic conditions. 3D model of temperature distrubtion and heat flow in the wheel and the rail ER6 and ER7 has been developped using the finite element method based on the COMSOL Multiphisics.
{"title":"\"THREE-DIMENSIONAL MODELLING OF RAILS / WHEELS MANUFACTURED BY ER6 AND ER7 IN TRAMWAY APPLICATIONS \"","authors":"E. Chiba, M. Abdelkrim, A. Belloufi, I. Rezgui","doi":"10.54684/ijmmt.2022.14.3.38","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.38","url":null,"abstract":"The wheels and rails of the train, tram etc. are often verified from their microstructure and plastic deformation, which usually appear in the outer layer of a wheel and rail, to analyse the causes of geometrical defects by monitoring the applied loads and variation of the temperature as suggested in the literature. This paper studies the effect of thermal stress applied with variations of the loads in contact on wheel/rail for the tramway, tracking through the state of the rail to discover the causes of geometric defects started by temperature variations and loads, and applying these variations of temperature and loads to know its resistance to these climatic conditions. 3D model of temperature distrubtion and heat flow in the wheel and the rail ER6 and ER7 has been developped using the finite element method based on the COMSOL Multiphisics.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47901526","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.220
H. Ramezanalizadeh
Aluminum matrix cast composites (AMCCs) are engaged materials for the fabrication of accountable and especially acute pieces utilized in the high-tech scope of industry such as automotive, aerospace, electronics, etc. In the present study, hybrid aluminum base composite reinforced with in-situ produced Mg2Si and Al3Ni particles were fabricated successfully in casting moods, and the structural features of inborn reinforcing compounds was evaluated in different thermal situations of solidification. For this issue, the composite microstructure was characterized by X-ray diffraction (XRD) and optical microscope (OM). In addition, the mechanical properties were evaluated by hardness test. According to the results, increasing in the cooling rate during solidification leads to the reduction of mediate size of the Mg2Si initially crystals, enhancement of their dispensation uniformity and clear increasing of their final amount; meanwhile, the average size of Al3Ni particles decreases significantly but their content is almost the same for different conditions.
{"title":"HYBRID ALUMINUM MATRIX COMPOSITES REINFORCED WITH IN SITU MG2SI AND AL3NI PHASES","authors":"H. Ramezanalizadeh","doi":"10.54684/ijmmt.2022.14.2.220","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.220","url":null,"abstract":"Aluminum matrix cast composites (AMCCs) are engaged materials for the fabrication of accountable and especially acute pieces utilized in the high-tech scope of industry such as automotive, aerospace, electronics, etc. In the present study, hybrid aluminum base composite reinforced with in-situ produced Mg2Si and Al3Ni particles were fabricated successfully in casting moods, and the structural features of inborn reinforcing compounds was evaluated in different thermal situations of solidification. For this issue, the composite microstructure was characterized by X-ray diffraction (XRD) and optical microscope (OM). In addition, the mechanical properties were evaluated by hardness test. According to the results, increasing in the cooling rate during solidification leads to the reduction of mediate size of the Mg2Si initially crystals, enhancement of their dispensation uniformity and clear increasing of their final amount; meanwhile, the average size of Al3Ni particles decreases significantly but their content is almost the same for different conditions.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47123474","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.258
M. Szabo, M. Dochia, Valentin Muller, L. Jitaru
The aim’s paper was to study some physico-mechanical properties for fashion tights and medicinal tights with compression degree 1 (ie 10-15 mm Hg), class 1, for the prevention of venous diseases of the legs. Tights made of PA (polyamide) and two-component yarns, polyamide, and elastane, with a fineness of 70 Den, were chosen for the study. For fashion tights, the yarn composition was 88% polyamide and 12% elastane, and for medicinal tights 85% polyamide and 15% elastane. The tights were made on circular knitting machines with small diameter, Merz, model CC4 II with a diameter of 4 ¾ inches, pitch 24 E, number of needles 360, for the average size, M (II) of the tights. Both types of women's tights were made in a jersey structure with weft yarns. The background yarns were 100% polyamide, and the weft yarns were elastomer yarns coated in two polyamide yarns to obtain a balanced yarn. Fashion tights are the common ones, and compressive tights are used to prevent incipient venous disorders of the legs, calming the sensation of pain or heavy legs. The experimental program included the study of hygroscopicity, the tensile strength in the direction of the wales, and the degree of compression at the ankle. The obtained data were analysed and presented comparatively.
{"title":"THE STUDY OF THE PHYSICO-MECHANICAL PROPERTIES OF FASHION TIGHTS COMPARED TO MEDICINAL TIGHTS","authors":"M. Szabo, M. Dochia, Valentin Muller, L. Jitaru","doi":"10.54684/ijmmt.2022.14.2.258","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.258","url":null,"abstract":"The aim’s paper was to study some physico-mechanical properties for fashion tights and medicinal tights with compression degree 1 (ie 10-15 mm Hg), class 1, for the prevention of venous diseases of the legs. Tights made of PA (polyamide) and two-component yarns, polyamide, and elastane, with a fineness of 70 Den, were chosen for the study. For fashion tights, the yarn composition was 88% polyamide and 12% elastane, and for medicinal tights 85% polyamide and 15% elastane. The tights were made on circular knitting machines with small diameter, Merz, model CC4 II with a diameter of 4 ¾ inches, pitch 24 E, number of needles 360, for the average size, M (II) of the tights. Both types of women's tights were made in a jersey structure with weft yarns. The background yarns were 100% polyamide, and the weft yarns were elastomer yarns coated in two polyamide yarns to obtain a balanced yarn. Fashion tights are the common ones, and compressive tights are used to prevent incipient venous disorders of the legs, calming the sensation of pain or heavy legs. The experimental program included the study of hygroscopicity, the tensile strength in the direction of the wales, and the degree of compression at the ankle. The obtained data were analysed and presented comparatively.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47035924","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.121
A. Lisiecki
Laser cladding is often used for manufacturing of protective coatings due to limited heat input. The thermal conditions are decisive for the microstructure and thus the properties. In this study Ni-based powder with addition of WC particles was used laser cladding with the TruDisk 3302 laser. Tests were conducted at different energy input (heat transfer efficiency not considered). Powder was fed directly into the melt pool by a single coaxial nozzle set in front of the melt pool. The influence of basic laser cladding parameters on the geometry, microstructure and hardness was determined. The heat input of laser cladding has significant effect on chemical and phase composition, as well as microstructure. The obtained coatings have typical composite structure with NiCr metallic matrix and WC carbides. The lower energy input of laser cladding is beneficial providing limited penetration depth, dilution, and preferable distribution and high share of tungsten carbides. However, too low energy input at the chosen technological conditions will lead to the lack of fusion. The share of carbides on cross section of the coatings produced at minimum heat input is over 50%, while for the maximum heat input the share is below 20%.
{"title":"STUDY OF LASER CLADDING OF COMPOSITE COATINGS","authors":"A. Lisiecki","doi":"10.54684/ijmmt.2022.14.2.121","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.121","url":null,"abstract":"Laser cladding is often used for manufacturing of protective coatings due to limited heat input. The thermal conditions are decisive for the microstructure and thus the properties. In this study Ni-based powder with addition of WC particles was used laser cladding with the TruDisk 3302 laser. Tests were conducted at different energy input (heat transfer efficiency not considered). Powder was fed directly into the melt pool by a single coaxial nozzle set in front of the melt pool. The influence of basic laser cladding parameters on the geometry, microstructure and hardness was determined. The heat input of laser cladding has significant effect on chemical and phase composition, as well as microstructure. The obtained coatings have typical composite structure with NiCr metallic matrix and WC carbides. The lower energy input of laser cladding is beneficial providing limited penetration depth, dilution, and preferable distribution and high share of tungsten carbides. However, too low energy input at the chosen technological conditions will lead to the lack of fusion. The share of carbides on cross section of the coatings produced at minimum heat input is over 50%, while for the maximum heat input the share is below 20%.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47477182","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.282
Mihail-Vlad Vasilescu, F. Panaitescu, M. Panaitescu, A. Scupi, I. Voicu
By using a hybrid system formed from two unconventional energy devices large vertical wind turbines and FLETTNER Balloon and a conventional source of energy, ship owners can save a great deal of fuel, thus making substantial savings and not least, reducing pollution, making environmentally friendly ships. Unfortunately, the legislation in force does not allow ships to enter ports with unconventional energy sources. For this reason, unconventional energy sources will be used only during transoceanic crossings or during longer journeys. In this article major points are: 1) the influence of the FLETTNER helium Balloon on the manoeuvrability and road stability of the ship; 2) the influence of large Vertical wind turbines installed on the deck of the container ship on the manoeuvrability and road stability of the ship; 3) the calculation of the stability of the ship with the FLETTNER Balloon with helium coupled and with the 4 Vertical wind turbines installed on the ship's deck; 4) modelling the phenomena regarding the comparative analysis of the forces in the FLETTNER Balloon and in the large Vertical wind turbines. As results were obtained: 1) velocity and pressure distributions, forces and kinetic energies for the FLETTNER Balloon in various weather conditions, with winds of 10 and 20 m / s respectively from different directions: 00, 300, 600, 900 in various planes; 2) the distributions of speeds and pressures, forces and kinetic energies studied individually for each of the four large vertical wind turbines at winds of 10 m/s and 20 m/s respectively in various planes, segregated according to the position of port bow, starboard and stern port, starboard. This development was due to the growing demands to solve various problems at the industrial level, coming to the aid of many engineers who wanted an improvement in the equipment used, but did not have the financial support to perform experiments.
{"title":"THE EFFECT OF USE OF UNCONVENTIONAL POWER GENERATION SYSTEMS ON THE SAFETY OF NAVIGATION","authors":"Mihail-Vlad Vasilescu, F. Panaitescu, M. Panaitescu, A. Scupi, I. Voicu","doi":"10.54684/ijmmt.2022.14.3.282","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.282","url":null,"abstract":"By using a hybrid system formed from two unconventional energy devices large vertical wind turbines and FLETTNER Balloon and a conventional source of energy, ship owners can save a great deal of fuel, thus making substantial savings and not least, reducing pollution, making environmentally friendly ships. Unfortunately, the legislation in force does not allow ships to enter ports with unconventional energy sources. For this reason, unconventional energy sources will be used only during transoceanic crossings or during longer journeys. In this article major points are: 1) the influence of the FLETTNER helium Balloon on the manoeuvrability and road stability of the ship; 2) the influence of large Vertical wind turbines installed on the deck of the container ship on the manoeuvrability and road stability of the ship; 3) the calculation of the stability of the ship with the FLETTNER Balloon with helium coupled and with the 4 Vertical wind turbines installed on the ship's deck; 4) modelling the phenomena regarding the comparative analysis of the forces in the FLETTNER Balloon and in the large Vertical wind turbines. As results were obtained: 1) velocity and pressure distributions, forces and kinetic energies for the FLETTNER Balloon in various weather conditions, with winds of 10 and 20 m / s respectively from different directions: 00, 300, 600, 900 in various planes; 2) the distributions of speeds and pressures, forces and kinetic energies studied individually for each of the four large vertical wind turbines at winds of 10 m/s and 20 m/s respectively in various planes, segregated according to the position of port bow, starboard and stern port, starboard. This development was due to the growing demands to solve various problems at the industrial level, coming to the aid of many engineers who wanted an improvement in the equipment used, but did not have the financial support to perform experiments.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42362093","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.299
A. Vilcu, I. Herghiligiu, I. Verzea, Raluca P. Lazarescu
Operational management issues represent a permanent challenge for the current economic environment and the research activity. This research will model a Travelling Salesman Problem (TSP). The complexity of this fundamental problem (np-hard) allows a chance to apply and develop heuristic methods and evolutionary algorithms along with exact methods (dynamic programming, branch & bound). This paper proposes a new discrete algorithm to solve the TSP based on the Particle Swarm Optimization (PSO) technique. The features of this method are fast determination through an iterative process of the optimal problem, the generalised search in all the solutions, and the avoidance of the local optimal. To avoid premature convergence, we have introduced a new operator with a new mathematical function, and we have proposed new techniques for measuring and maintaining population diversity. We tested the algorithm's performance by applying it to numerical instances and compared it to the solutions and performance provided by other evolutionary algorithms. By delaying the convergence process, the new algorithm PSO offers reasonable solutions in terms of quality comparable to those offered by different evolutionary algorithms tested. At the end of the research, we highlighted the conclusions, limitations, and new techniques based on the PSO algorithm.
{"title":"A NEW PSO-BASED ALGORITHM FOR AN OPERATIONAL MANAGEMENT PROBLEM","authors":"A. Vilcu, I. Herghiligiu, I. Verzea, Raluca P. Lazarescu","doi":"10.54684/ijmmt.2022.14.3.299","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.299","url":null,"abstract":"Operational management issues represent a permanent challenge for the current economic environment and the research activity. This research will model a Travelling Salesman Problem (TSP). The complexity of this fundamental problem (np-hard) allows a chance to apply and develop heuristic methods and evolutionary algorithms along with exact methods (dynamic programming, branch & bound). This paper proposes a new discrete algorithm to solve the TSP based on the Particle Swarm Optimization (PSO) technique. The features of this method are fast determination through an iterative process of the optimal problem, the generalised search in all the solutions, and the avoidance of the local optimal. To avoid premature convergence, we have introduced a new operator with a new mathematical function, and we have proposed new techniques for measuring and maintaining population diversity. We tested the algorithm's performance by applying it to numerical instances and compared it to the solutions and performance provided by other evolutionary algorithms. By delaying the convergence process, the new algorithm PSO offers reasonable solutions in terms of quality comparable to those offered by different evolutionary algorithms tested. At the end of the research, we highlighted the conclusions, limitations, and new techniques based on the PSO algorithm.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42586706","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：