Pub Date : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.33
E. Cherecheş, M. Cherecheș, Liviu Zupcu, A. Minea
In the last years, a lot of research is dedicated to development of new heat transfer fluids. Phase change materials (PCM) are considered a new generation of heat transfer fluids. A convenient tool to verify the efficiency of a fluid PCM for different practical applications is the simulation approach. In order for such an analysis to be possible, it is necessary to correctly and completely describe the fluids, which supposes the knowledge of the laws of variation of the thermophysical properties with temperature. In many industrial applications, heat transfer is one of the most significant process, but the development of efficient equipment is limited by the low thermal conductivity of conventional heat transfer fluids. Complex CFD (computational fluid dynamics) programs, such as ANSYS Fluent, are capable of replacing experimental results. Therefore, based on previous experimental data, a numerical study on heat transfer will be performed, involving laminar flow conditions. In this numerical study, a number of nanofluids based on PEG 400 (polyethylene glycol PEG 400) and two type of nanoparticles (Al2O3 and ZnO), have been implemented in a commercial code to analyze their behavior at heating. Their heating behavior must be understood under different conditions or factors, such as concentration, temperature, pressure, flow conditions, heating systems and flow geometry. In conclusion, PEG 400 based nanofluids is considered to have a high potential for a number of practical applications (for example for their possible use in thermal energy storage), but further studies are needed, as well as the intensification of numerical and experimental research because no applied studies have been identified in the literature.
{"title":"CFD ANALYSIS OF PEG 400 BASED NANOFLUIDS","authors":"E. Cherecheş, M. Cherecheș, Liviu Zupcu, A. Minea","doi":"10.54684/ijmmt.2022.14.3.33","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.33","url":null,"abstract":"In the last years, a lot of research is dedicated to development of new heat transfer fluids. Phase change materials (PCM) are considered a new generation of heat transfer fluids. A convenient tool to verify the efficiency of a fluid PCM for different practical applications is the simulation approach. In order for such an analysis to be possible, it is necessary to correctly and completely describe the fluids, which supposes the knowledge of the laws of variation of the thermophysical properties with temperature. In many industrial applications, heat transfer is one of the most significant process, but the development of efficient equipment is limited by the low thermal conductivity of conventional heat transfer fluids. Complex CFD (computational fluid dynamics) programs, such as ANSYS Fluent, are capable of replacing experimental results. Therefore, based on previous experimental data, a numerical study on heat transfer will be performed, involving laminar flow conditions. In this numerical study, a number of nanofluids based on PEG 400 (polyethylene glycol PEG 400) and two type of nanoparticles (Al2O3 and ZnO), have been implemented in a commercial code to analyze their behavior at heating. Their heating behavior must be understood under different conditions or factors, such as concentration, temperature, pressure, flow conditions, heating systems and flow geometry. In conclusion, PEG 400 based nanofluids is considered to have a high potential for a number of practical applications (for example for their possible use in thermal energy storage), but further studies are needed, as well as the intensification of numerical and experimental research because no applied studies have been identified in the literature.","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":"43711738","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.2022.14.3.62
G. Frumuşanu, A. Epureanu
Nowadays increased expectations regarding the industrial processes combined with the outstanding progress in the field of computers and information technology have led to the occurrence and development of the Industry 4.0 concept. The currently accepted meaning of digitalization is the use of digital technologies to transform an object/process in order to provide new revenue and value-producing opportunities. Industry 4.0 means the entrance of industrial manufacturing into the digitalization era. This paper intends to be a contribution to the implementation of Europe’s strategy for digitalization and proposes the holonic digitalization concept introduced in manufacturing and tailored for supporting the development of the 4th industrial revolution. The implementation of manufacturing holonic digitalization consists of the accomplishment of the following four steps: sampling, holonization, digital representation of the holons, and building of holon dataset. Holonization of the manufacturing activity means its deep multi-level configuration into several stand-alone components, each component being a holon of manufacturing i.e., a sequence of manufacturing seen as a holon. The digital description of a holon refers to both holon attributes and causality, and it is obtained by holistic monitoring of the holon operation. The building of holonic cyber-tooling means to design both the flow of information and the decision-making procedure, and to build perennial cyber-tools needed to support the flow and procedure. This building lays on approaching the information processing as a decision-making process, and on the implementation of appropriate performant digital technologies.
{"title":"\"HOLONIC DIGITALIZATION OF MANUFACTURING – THE TOOL OF 4-TH MANUFACTURING REVOLUTION\"","authors":"G. Frumuşanu, A. Epureanu","doi":"10.54684/ijmmt.2022.14.3.62","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.62","url":null,"abstract":"Nowadays increased expectations regarding the industrial processes combined with the outstanding progress in the field of computers and information technology have led to the occurrence and development of the Industry 4.0 concept. The currently accepted meaning of digitalization is the use of digital technologies to transform an object/process in order to provide new revenue and value-producing opportunities. Industry 4.0 means the entrance of industrial manufacturing into the digitalization era. This paper intends to be a contribution to the implementation of Europe’s strategy for digitalization and proposes the holonic digitalization concept introduced in manufacturing and tailored for supporting the development of the 4th industrial revolution. The implementation of manufacturing holonic digitalization consists of the accomplishment of the following four steps: sampling, holonization, digital representation of the holons, and building of holon dataset. Holonization of the manufacturing activity means its deep multi-level configuration into several stand-alone components, each component being a holon of manufacturing i.e., a sequence of manufacturing seen as a holon. The digital description of a holon refers to both holon attributes and causality, and it is obtained by holistic monitoring of the holon operation. The building of holonic cyber-tooling means to design both the flow of information and the decision-making procedure, and to build perennial cyber-tools needed to support the flow and procedure. This building lays on approaching the information processing as a decision-making process, and on the implementation of appropriate performant digital technologies.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41392944","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.2022.14.2.264
M. Turof, D. Deleanu
"In recent years maritime and inland waterway transport have developed unprecedentedly in close agreement with the rapid pace of industrialization and the increase in domestic and foreign freight traffic. This led to the development and upgrading of naval equipment. Thus, a series of programs have also been developed in the field of operation and maintenance of naval equipment. This also involved certain upgrades in the field of equipment maintenance and implicitly in terms of lubrication and increasing the service life to their nominal parameters. This development of shipping also included the development of engine oils. an important part of the safe operation of naval propulsion engines. Nothing is more important for the life of an internal combustion engine than proper lubrication and oil filtration for the engine and other moving parts. This paper aims to analyze the lubrication systems and the wear processes at the sliding bearings of the engine assembly for a marine propulsion engine. The last part of the paper presents the thermal calculation of the sliding bearings both due to the fluid friction and the heat release from the engine. The reference engine considered in the calculation of the lubrication system was a naval engine type ROLLS-ROYCE-B32: 40L8P with a rated power of 4000 kW. Starting from the oil flow required for lubrication, the oil flow required to dissipate the heat from the bed bearing was determined. "
{"title":"ANALYSIS OF GREASING AND WEAR PROCESSES ON THE SLIDING BEARINGS OF A NAVAL PROPULSION ENGINE","authors":"M. Turof, D. Deleanu","doi":"10.54684/ijmmt.2022.14.2.264","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.264","url":null,"abstract":"\"In recent years maritime and inland waterway transport have developed unprecedentedly in close agreement with the rapid pace of industrialization and the increase in domestic and foreign freight traffic. This led to the development and upgrading of naval equipment. Thus, a series of programs have also been developed in the field of operation and maintenance of naval equipment. This also involved certain upgrades in the field of equipment maintenance and implicitly in terms of lubrication and increasing the service life to their nominal parameters. This development of shipping also included the development of engine oils. an important part of the safe operation of naval propulsion engines. Nothing is more important for the life of an internal combustion engine than proper lubrication and oil filtration for the engine and other moving parts. This paper aims to analyze the lubrication systems and the wear processes at the sliding bearings of the engine assembly for a marine propulsion engine. The last part of the paper presents the thermal calculation of the sliding bearings both due to the fluid friction and the heat release from the engine. The reference engine considered in the calculation of the lubrication system was a naval engine type ROLLS-ROYCE-B32: 40L8P with a rated power of 4000 kW. Starting from the oil flow required for lubrication, the oil flow required to dissipate the heat from the bed bearing was determined. \"","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":"41750737","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.2022.14.2.69
C. Dumitrache, D. Deleanu
Turbine is a hydraulic engine where energy transfer occurs both based on the kinetic energy and potential (pressure) of the water. In this article we have designed the Spiral Turbine Casing – Impeller assembly with dimensions, geometry from technical documentation forms and the articles of other authors. CAD design of this assembly is a challenge and was done using .NX SIEMENS. The study of the fluid flow was done with ANSYS CFX by importing this assembly, some conclusions were drawn regarding the fluid velocities and the pressure field. The cavitation phenomenon that may occur in the operation of the turbine was also taken into account and some conclusions were drawn regarding the effects of this phenomenon. If the presence of vapours in the hydraulic circuit is found, then the cavitation can develop and this fact can be highlighted with Vapour Volume Fraction.
{"title":"SPIRAL TURBINE CASING - IMPELLER ASSEMBLY DESIGN AND FLUID FLOW ANALYSIS","authors":"C. Dumitrache, D. Deleanu","doi":"10.54684/ijmmt.2022.14.2.69","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.69","url":null,"abstract":"Turbine is a hydraulic engine where energy transfer occurs both based on the kinetic energy and potential (pressure) of the water. In this article we have designed the Spiral Turbine Casing – Impeller assembly with dimensions, geometry from technical documentation forms and the articles of other authors. CAD design of this assembly is a challenge and was done using .NX SIEMENS. The study of the fluid flow was done with ANSYS CFX by importing this assembly, some conclusions were drawn regarding the fluid velocities and the pressure field. The cavitation phenomenon that may occur in the operation of the turbine was also taken into account and some conclusions were drawn regarding the effects of this phenomenon. If the presence of vapours in the hydraulic circuit is found, then the cavitation can develop and this fact can be highlighted with Vapour Volume Fraction.","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":"48867516","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.2022.14.3.205
RA Polcovnicu, N. Taranu, D. Ungureanu, S. Hudișteanu
Nowadays, more and more solar panel devices are mounted on the roofs. In some particular situations, the assessment of a structure in a higher energetic efficiency category (passive/active houses) may lead to the case of covering the entire roof with a system of photovoltaic panels. In these circumstances, an experimental study for testing the structural behaviour of the roof is mandatory to accurately estimate the true wind load. In this paper is presented an experimental setup based on two configurations of roofs, both made with photovoltaic panel systems, which are tested to wind actions. To maximize precision, the roof scaled models were designed in 3D modelling software and printed using a 3D printer. After the models were printed, they were instrumented with strain-gauge pressure sensors and prepared for the wind load tests.
{"title":"WIND LOAD EVALUATION OF ROOF PHOTOVOLTAIC PANELS LOADED IN THE BOUNDARY LAYER WIND TUNNEL","authors":"RA Polcovnicu, N. Taranu, D. Ungureanu, S. Hudișteanu","doi":"10.54684/ijmmt.2022.14.3.205","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.205","url":null,"abstract":"Nowadays, more and more solar panel devices are mounted on the roofs. In some particular situations, the assessment of a structure in a higher energetic efficiency category (passive/active houses) may lead to the case of covering the entire roof with a system of photovoltaic panels. In these circumstances, an experimental study for testing the structural behaviour of the roof is mandatory to accurately estimate the true wind load. In this paper is presented an experimental setup based on two configurations of roofs, both made with photovoltaic panel systems, which are tested to wind actions. To maximize precision, the roof scaled models were designed in 3D modelling software and printed using a 3D printer. After the models were printed, they were instrumented with strain-gauge pressure sensors and prepared for the wind load tests.","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":"49430860","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.2022.14.2.159
G. D. Muscă Anghelache, G. Căpățână, M. A. Potîrniche
The claw for round bales is an attachment to the base machine of a front loader. This is used in agriculture for handling of big sized straw bales. Arms opening respectively, closing, are performed with different speeds to allow claws removal from bales stack without damaging the nearby bales. The strong construction ensures handling of big sized bales. The needed force during transport is provided by two hydraulic cylinders and hydraulic safety valve. For making the transport systems used in agriculture, it is useful to make computer aided simulations, to obtain some virtual models for such equipment. This paperwork presents how the claw for round bales handling can be designed, starting from needed parameters (bale size, bale weight, lifting capacity, etc.) and farmer’s requirements. We went through the stages of computer aided engineering taking into account various requirements of the farmers. The claw for bales handling is attached to a front loader or a tractor based upon the equipment fleet the farmers own. The parametric modeling of the claw type attachment for round bales was done by using NX 7.5 specialized software. This software uses powerful tools for modeling, allowing the use of the most efficient techniques for advanced modeling – from explicit modeling of solids and surfaces to parametric and direct modelling.
{"title":"CLAW FOR ROUND BALES","authors":"G. D. Muscă Anghelache, G. Căpățână, M. A. Potîrniche","doi":"10.54684/ijmmt.2022.14.2.159","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.159","url":null,"abstract":"The claw for round bales is an attachment to the base machine of a front loader. This is used in agriculture for handling of big sized straw bales. Arms opening respectively, closing, are performed with different speeds to allow claws removal from bales stack without damaging the nearby bales. The strong construction ensures handling of big sized bales. The needed force during transport is provided by two hydraulic cylinders and hydraulic safety valve. For making the transport systems used in agriculture, it is useful to make computer aided simulations, to obtain some virtual models for such equipment. This paperwork presents how the claw for round bales handling can be designed, starting from needed parameters (bale size, bale weight, lifting capacity, etc.) and farmer’s requirements. We went through the stages of computer aided engineering taking into account various requirements of the farmers. The claw for bales handling is attached to a front loader or a tractor based upon the equipment fleet the farmers own. The parametric modeling of the claw type attachment for round bales was done by using NX 7.5 specialized software. This software uses powerful tools for modeling, allowing the use of the most efficient techniques for advanced modeling – from explicit modeling of solids and surfaces to parametric and direct modelling.","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":"45971657","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.2022.14.2.294
D. Cerlinca, S. Spinu
The contacts of mechanical components transmit loads that lead to subsurface stresses developing in the contacting bodies. In an efficient tribological design, these stresses are expected to remain under the yield strength of the softer contacting material. When this condition is not met, plastic flow occurs in the softer body. Under the assumption of isotropic hardening, the yield strength increases with the development of additional plastic strains. As plastic flow processes are dissipative and therefore path dependent, the elastic-plastic problem is unsolvable through analytical endeavours, but can be approached with a numerical algorithm capable of simulating the loading history. The Betti’s reciprocal theorem provides the theoretical framework for the application of superposition principle to elastic-plastic stresses and displacement. An algorithm consisting in three nested loops is assembled from the solutions of simpler problems: (1) the purely elastic rough contact problem, (2) the inclusion problem and (3) the problem of the plastic strain increment. The numerical simulations suggest that the residual stresses decrease the intensity of the total stresses, thus delaying additional plastic flow. With increasing load, the heart-shaped plastic strain volume advances toward the surface, enveloping a plastic core near the initial point of contact. Compared to the purely elastic case, the elastic-plastic pressure shows a flatter distribution, while the contact radius is increased.
{"title":"\"NUMERICAL SIMULATION OF ELASTIC-PLASTIC CONTACT WITH ISOTROPIC HARDENING \"","authors":"D. Cerlinca, S. Spinu","doi":"10.54684/ijmmt.2022.14.2.294","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.294","url":null,"abstract":"The contacts of mechanical components transmit loads that lead to subsurface stresses developing in the contacting bodies. In an efficient tribological design, these stresses are expected to remain under the yield strength of the softer contacting material. When this condition is not met, plastic flow occurs in the softer body. Under the assumption of isotropic hardening, the yield strength increases with the development of additional plastic strains. As plastic flow processes are dissipative and therefore path dependent, the elastic-plastic problem is unsolvable through analytical endeavours, but can be approached with a numerical algorithm capable of simulating the loading history. The Betti’s reciprocal theorem provides the theoretical framework for the application of superposition principle to elastic-plastic stresses and displacement. An algorithm consisting in three nested loops is assembled from the solutions of simpler problems: (1) the purely elastic rough contact problem, (2) the inclusion problem and (3) the problem of the plastic strain increment. The numerical simulations suggest that the residual stresses decrease the intensity of the total stresses, thus delaying additional plastic flow. With increasing load, the heart-shaped plastic strain volume advances toward the surface, enveloping a plastic core near the initial point of contact. Compared to the purely elastic case, the elastic-plastic pressure shows a flatter distribution, while the contact radius is increased.","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":"46585615","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.2022.14.2.145
M. Mihălcică, M. Stanciu, H. Teodorescu, N. Iftimie
The paper presents the experimental investigations regarding the viscoelastic behaviour of maple wood used in the construction of stringed musical instruments. The studied samples were classified according to the anatomical structure of the wood in the four classes of anatomical quality used by the manufacturers of musical instruments. Based on the mechanical analysis in dynamic regime, the viscoelastic parameters were determined - the preservation module E', the loss modulus E' and the damping tan δ, in conditions of constant temperature, respectively variable temperature. It was found that the determined rheological quantities depend on the anatomical structure of the wood, the frequency of the excitation and the temperature.
{"title":"EVALUATION OF VISCOUS-ELASTIC PROPERTIES OF RESONANCE MAPLE WOOD","authors":"M. Mihălcică, M. Stanciu, H. Teodorescu, N. Iftimie","doi":"10.54684/ijmmt.2022.14.2.145","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.145","url":null,"abstract":"The paper presents the experimental investigations regarding the viscoelastic behaviour of maple wood used in the construction of stringed musical instruments. The studied samples were classified according to the anatomical structure of the wood in the four classes of anatomical quality used by the manufacturers of musical instruments. Based on the mechanical analysis in dynamic regime, the viscoelastic parameters were determined - the preservation module E', the loss modulus E' and the damping tan δ, in conditions of constant temperature, respectively variable temperature. It was found that the determined rheological quantities depend on the anatomical structure of the wood, the frequency of the excitation and the temperature.","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":"46329728","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.2022.14.2.166
M. Muszyński
Machine accuracy of workpiece is dependent on a number of factors including the machine spindle nose position. Recently, the application of thermal phenomenon especially in electrospindle has been of great interest. Thermal displacement of the spindle nose affects the accuracy of machining and it also depends largely on the amount of power loss in the bearings. This paper presents the angular contact bearing model which takes into account the stiffness of spring stacking. The result show what effect does the stiffness of the spring stacking have on axial force, contact forces and displacements of angular contact bearing. Moreover, omission in the analysis of the stiffness of the spring stacking result in errors in the estimation of the position on the spindle nose due to the deformation of the elastic spring.
{"title":"EFFECT OF SPRING STACKING STIFFNESS ON AXIAL FORCE AND DISPLACEMENTS OF ANGULAR CONTACT SPINDLE BEARINGS","authors":"M. Muszyński","doi":"10.54684/ijmmt.2022.14.2.166","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.166","url":null,"abstract":"Machine accuracy of workpiece is dependent on a number of factors including the machine spindle nose position. Recently, the application of thermal phenomenon especially in electrospindle has been of great interest. Thermal displacement of the spindle nose affects the accuracy of machining and it also depends largely on the amount of power loss in the bearings. This paper presents the angular contact bearing model which takes into account the stiffness of spring stacking. The result show what effect does the stiffness of the spring stacking have on axial force, contact forces and displacements of angular contact bearing. Moreover, omission in the analysis of the stiffness of the spring stacking result in errors in the estimation of the position on the spindle nose due to the deformation of the elastic spring.","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":"44028635","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.2022.14.3.344
Mohammed Amira, A. Belloufi, M. Abdelkrim
The influence of the cutting conditions of machining process on the surface roughness has been the subject of several scientific works in order to optimize the milling process to get the best-finished surface machined by milling. During the last decades, many methods of artificial intelligence have been carried out to investigate the effect of milling conditions like the cutting speed, feed per tooth and depth of cut on surface integrity of machined surfaces by milling process. However, the progress on the use of Numerical Approaches to predict the surface integrity of machined surfaces like roughness, microhardness, residual stress and cutting temperature still lagging behind the other advances in the industry. The aim of this work is to use the fuzzy logic to predict the surface roughness of the milled surfaces and to study the effect of cutting parameters (cutting speed, feed per tooth and depth of cut) on the roughness of the surfaces machined by milling. a new model was created using fuzzy logic based on an experimental database. The database includes the variation of the surface roughness of machined surfaces of the Ti-6Al-4V by milling according to the cutting parameters (cutting speed, feed per tooth and depth of cut) on which the model was develop on MATLAB using fuzzy tool. The inputs of the fuzzy inference model were the three cutting parameters of milling: the cutting speed, feed per tooth and depth of cut, and the output of the fuzzy system was the roughness of the machined surfaces by milling of the Ti-6Al-4V. The predicted values of roughness obtained by the fuzzy model were compared to the experimental values and the result was very good, the average error rate was verry low that’s mean that the prediction model based on fuzzy logic works correctly and with high accuracy and can be used as a solution to predict the surface roughness before starting milling provided to respect a very specific range of parameters (defined by the universe of discourse) when using this model. The approach based on fuzzy logic can be used also to predict other phenomena of milling process like cutting temperature and microhardness.
{"title":"PREDICTION AND ANALYSIS OF THE ROUGHNESS OF MILLED SURFACES BASED ON FUZZY LOGIC","authors":"Mohammed Amira, A. Belloufi, M. Abdelkrim","doi":"10.54684/ijmmt.2022.14.3.344","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.344","url":null,"abstract":"The influence of the cutting conditions of machining process on the surface roughness has been the subject of several scientific works in order to optimize the milling process to get the best-finished surface machined by milling. During the last decades, many methods of artificial intelligence have been carried out to investigate the effect of milling conditions like the cutting speed, feed per tooth and depth of cut on surface integrity of machined surfaces by milling process. However, the progress on the use of Numerical Approaches to predict the surface integrity of machined surfaces like roughness, microhardness, residual stress and cutting temperature still lagging behind the other advances in the industry. The aim of this work is to use the fuzzy logic to predict the surface roughness of the milled surfaces and to study the effect of cutting parameters (cutting speed, feed per tooth and depth of cut) on the roughness of the surfaces machined by milling. a new model was created using fuzzy logic based on an experimental database. The database includes the variation of the surface roughness of machined surfaces of the Ti-6Al-4V by milling according to the cutting parameters (cutting speed, feed per tooth and depth of cut) on which the model was develop on MATLAB using fuzzy tool. The inputs of the fuzzy inference model were the three cutting parameters of milling: the cutting speed, feed per tooth and depth of cut, and the output of the fuzzy system was the roughness of the machined surfaces by milling of the Ti-6Al-4V. The predicted values of roughness obtained by the fuzzy model were compared to the experimental values and the result was very good, the average error rate was verry low that’s mean that the prediction model based on fuzzy logic works correctly and with high accuracy and can be used as a solution to predict the surface roughness before starting milling provided to respect a very specific range of parameters (defined by the universe of discourse) when using this model. The approach based on fuzzy logic can be used also to predict other phenomena of milling process like cutting temperature and microhardness.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70884168","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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