Pub Date : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.215
M. Roșu, C. Radu Frenţ, M. Iliescu
This paper presents research results on optimum manufacturing process for prototyping high precision customized products parts and, therefore, products. The results would be applied to reduce research cost for development of new personalized devices used, for example, in prosthetics of missing limbs. These devices need high precision parts and, not the least, affordable costs. In order to obtain the prototype of these devices, several types of manufacturing processes have been analysed. As conclusion of the research results, we can state that the selection of the best manufacturing process type for obtaining high precision customized parts is a big challenge for engineers as they must get the best technique which ensures high precision (on one hand) and affordable costs (materials and equipment’s, on the other hand). When the prototyped parts are components of a special product, as example, an upper limb prosthesis, high attention should be also focused on the reliability of prototyped parts. 3D printing technologies have developed and extremely evolved lately but still there are cases when their performances are limited (especially when small dimensions and tight tolerances are required for parts’ geometry). Also, considering the component costs, an adequate analysis must be done in order to select the optimal variant of the production process. The research results presented in this paper are focused on the analysis of optimal cost for prototyping customized parts of personalized devices used for the upper limb prosthesis.
{"title":"TECHNICAL AND ECONOMIC ANALYSIS OF MANUFACTURING PROCESS FOR HIGH PRECISION CUSTOMIZED PART","authors":"M. Roșu, C. Radu Frenţ, M. Iliescu","doi":"10.54684/ijmmt.2022.14.2.215","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.215","url":null,"abstract":"This paper presents research results on optimum manufacturing process for prototyping high precision customized products parts and, therefore, products. The results would be applied to reduce research cost for development of new personalized devices used, for example, in prosthetics of missing limbs. These devices need high precision parts and, not the least, affordable costs. In order to obtain the prototype of these devices, several types of manufacturing processes have been analysed. As conclusion of the research results, we can state that the selection of the best manufacturing process type for obtaining high precision customized parts is a big challenge for engineers as they must get the best technique which ensures high precision (on one hand) and affordable costs (materials and equipment’s, on the other hand). When the prototyped parts are components of a special product, as example, an upper limb prosthesis, high attention should be also focused on the reliability of prototyped parts. 3D printing technologies have developed and extremely evolved lately but still there are cases when their performances are limited (especially when small dimensions and tight tolerances are required for parts’ geometry). Also, considering the component costs, an adequate analysis must be done in order to select the optimal variant of the production process. The research results presented in this paper are focused on the analysis of optimal cost for prototyping customized parts of personalized devices used for the upper limb prosthesis.","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":"46147376","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.2022.14.2.20
N. Baroiu, G. Moroșanu, V. Teodor, R. Crăciun, V. Păunoiu
Recently, 3D measurement systems have developed more and more in various fields. With the help of 3D measuring systems, the measurement time in design, manufacture, assembly and production is substantially reduced. In this paper, it is proposed to redesign two pieces of a helical pump (driver and driven screws) based on numerical models obtained by scanning. These models are obtained based on the processing of point clouds resulting from the 3D scanning of the respective pieces. After completing the actual scanning process, the numerical models were measured using specific software to determine the dimensional characteristics and their modeling was performed in a computer-aided design program. Subsequently, the inspection was performed by overlapping the scanned model and the CAD model of each piece, in order to be able to compare the analytical models with the real pieces. This comparison allows to appreciate the degree to which the analytical model obtained by redesign corresponds to the real piece. In this way, the ability of future pieces obtained based on the analytical model to be able to accomplish the desired functional role can be appreciated.
{"title":"USE OF REVERSE ENGINEERING TECHNIQUES FOR INSPECTING SCREWS SURFACES OF A HELICAL HYDRAULIC PUMP","authors":"N. Baroiu, G. Moroșanu, V. Teodor, R. Crăciun, V. Păunoiu","doi":"10.54684/ijmmt.2022.14.2.20","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.20","url":null,"abstract":"Recently, 3D measurement systems have developed more and more in various fields. With the help of 3D measuring systems, the measurement time in design, manufacture, assembly and production is substantially reduced. In this paper, it is proposed to redesign two pieces of a helical pump (driver and driven screws) based on numerical models obtained by scanning. These models are obtained based on the processing of point clouds resulting from the 3D scanning of the respective pieces. After completing the actual scanning process, the numerical models were measured using specific software to determine the dimensional characteristics and their modeling was performed in a computer-aided design program. Subsequently, the inspection was performed by overlapping the scanned model and the CAD model of each piece, in order to be able to compare the analytical models with the real pieces. This comparison allows to appreciate the degree to which the analytical model obtained by redesign corresponds to the real piece. In this way, the ability of future pieces obtained based on the analytical model to be able to accomplish the desired functional role can be appreciated.","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":"42628730","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.2022.14.3.319
D. Cerlinca, S. Spinu
The starting point in the calculation of normal displacement due to transient heating is the Green’s function for the elastic half-space. Superposition principle leads to a triple integral (double integral over surface and simple integral over time) that can be formally re-written as a three-dimensional convolution product. Given the singularities of the Green’s function in the time/space domain, it is more convenient to employ its spectral counterpart, i.e. the frequency response function (FRF), in the convolution calculation. A special technique for the calculation of the 3D convolution product based on the FRF is advanced in this paper. The resulting algorithm is very efficient from a computational point of view, as the transfers to and from the time/space domain to the frequency domain are handled by the fast Fourier transform. A simulation example is presented, involving the transient thermoelastic displacement due to a uniform heat source that vanishes everywhere except for a square surface domain, and which is applied continuously only in a limited time window. The numerical results predict that the displacement increases with time as long as heat is supplied, and is gradually recovered once the heat is removed. The loaded half-space patch undergoes a growth-release process that is accurately captured by the simulation method. The developed framework anticipates the solution of the contact process with transient heating.
{"title":"\"THERMOELASTIC DISPLACEMENT DUE TO TRANSIENT SURFACE HEATING \"","authors":"D. Cerlinca, S. Spinu","doi":"10.54684/ijmmt.2022.14.3.319","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.319","url":null,"abstract":"The starting point in the calculation of normal displacement due to transient heating is the Green’s function for the elastic half-space. Superposition principle leads to a triple integral (double integral over surface and simple integral over time) that can be formally re-written as a three-dimensional convolution product. Given the singularities of the Green’s function in the time/space domain, it is more convenient to employ its spectral counterpart, i.e. the frequency response function (FRF), in the convolution calculation. A special technique for the calculation of the 3D convolution product based on the FRF is advanced in this paper. The resulting algorithm is very efficient from a computational point of view, as the transfers to and from the time/space domain to the frequency domain are handled by the fast Fourier transform. A simulation example is presented, involving the transient thermoelastic displacement due to a uniform heat source that vanishes everywhere except for a square surface domain, and which is applied continuously only in a limited time window. The numerical results predict that the displacement increases with time as long as heat is supplied, and is gradually recovered once the heat is removed. The loaded half-space patch undergoes a growth-release process that is accurately captured by the simulation method. The developed framework anticipates the solution of the contact process with transient heating.","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":"45252654","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.2022.14.3.130
Andreea Mandru, L. Rusu, F. Pacuraru
Traditionally, ship hydrodynamic performances are predicted by extrapolating the model scale measurements or numerical results to full scale. Recently, scientific publications have highlighted the importance of ship scale numerical simulation and its validation. CFD may be used to determine the main reasons for the poor performance of vessels in operation and to evaluate the efficiency of energy-saving solutions that enhance the vessel's hydrodynamics and aerodynamics. Lloyd’s Register (LR) held the world's first workshop dedicated to ship full-scale hydrodynamic performance predictions, where the industry has published comprehensive measurements obtained during the sea trials to offer the community the chance to validate the CFD solvers for full-scale computations. This paper focuses on the numerical investigation of the full-scale general cargo vessel REGAL. NUMECA/Fine Marine commercial code based on the RANS-VOF solver has been used to evaluate the flow field around the hull. Four speeds were considered for this investigation: 8, 10, 12, and 14 knots, and the simulation conditions, identical to the sea trials records, were also taken into consideration. The simulation results were compared to the data provided by LR in 2015 in the workshop proceeding.
{"title":"HYDRODYNAMICS PERFORMANCE PREDICTION OF A FULL-SCALE SHIP","authors":"Andreea Mandru, L. Rusu, F. Pacuraru","doi":"10.54684/ijmmt.2022.14.3.130","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.130","url":null,"abstract":"Traditionally, ship hydrodynamic performances are predicted by extrapolating the model scale measurements or numerical results to full scale. Recently, scientific publications have highlighted the importance of ship scale numerical simulation and its validation. CFD may be used to determine the main reasons for the poor performance of vessels in operation and to evaluate the efficiency of energy-saving solutions that enhance the vessel's hydrodynamics and aerodynamics. Lloyd’s Register (LR) held the world's first workshop dedicated to ship full-scale hydrodynamic performance predictions, where the industry has published comprehensive measurements obtained during the sea trials to offer the community the chance to validate the CFD solvers for full-scale computations. This paper focuses on the numerical investigation of the full-scale general cargo vessel REGAL. NUMECA/Fine Marine commercial code based on the RANS-VOF solver has been used to evaluate the flow field around the hull. Four speeds were considered for this investigation: 8, 10, 12, and 14 knots, and the simulation conditions, identical to the sea trials records, were also taken into consideration. The simulation results were compared to the data provided by LR in 2015 in the workshop proceeding.","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":"46552451","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 present paper describes an experimental investigation on mechanical properties of poly-lactic-acid (PLA) parts under compressive and flexural loading. The PLA parts are fabricated by fused deposition modelling (FDM) technique. In present work, effect of raster angle, raster width and infill density on strength and modulus of parts under compressive and flexural loading is studied. It is found that infill density affects compressive strength and modulus of parts significantly under compressive loading. Compressive properties increase with increase in infill density. Further, it is found that raster width and infill density significantly influence flexural strength and modulus. Flexural properties increase with increase in infill density, and decrease in decrease in raster width. Further, predictive models are developed for responses, and process parameters are optimized using genetic algorithm to maximize the responses.
{"title":"FDM FABRICATED PLA PARTS: AN EXPERIMENTAL STUDY OF EFFECT OF PROCESS PARAMETERS ON MECHANICAL PROPERTIES UNDER COMPRESSIVE AND FLEXURAL LOADING","authors":"Shailendra Kumar, Soham Teraiya, Vishal Kumar Koriya","doi":"10.54684/ijmmt.2022.14.2.111","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.111","url":null,"abstract":"The present paper describes an experimental investigation on mechanical properties of poly-lactic-acid (PLA) parts under compressive and flexural loading. The PLA parts are fabricated by fused deposition modelling (FDM) technique. In present work, effect of raster angle, raster width and infill density on strength and modulus of parts under compressive and flexural loading is studied. It is found that infill density affects compressive strength and modulus of parts significantly under compressive loading. Compressive properties increase with increase in infill density. Further, it is found that raster width and infill density significantly influence flexural strength and modulus. Flexural properties increase with increase in infill density, and decrease in decrease in raster width. Further, predictive models are developed for responses, and process parameters are optimized using genetic algorithm to maximize the responses.","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":"46559006","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.2022.14.2.208
Muhammad Akhlis Rizza, Ratna Monasari, Z. Emzain, Asrori Asrori, Ilham Krissetyawan Nusantara
This study aims to determine the effect of holding time and oil viscosity on the S45C steel hardening process on the corrosion rate. The corrosion rate is measured using the weight loss method. Micro-photo observations of the S45C steel surface were carried out to determine the type of corrosion. The results demonstrate that the corrosion rate of hardened S45C steel decreases following the longer holding time during hardening. In addition, the corrosion rate of hardened S45C steel decreases when the viscosity of the oil used during hardening is thicker. Finally, the type of corrosion is uniform and pitting corrosion.
{"title":"CORROSION PREVENTION ON S45C USING HARDENING METHOD","authors":"Muhammad Akhlis Rizza, Ratna Monasari, Z. Emzain, Asrori Asrori, Ilham Krissetyawan Nusantara","doi":"10.54684/ijmmt.2022.14.2.208","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.208","url":null,"abstract":"This study aims to determine the effect of holding time and oil viscosity on the S45C steel hardening process on the corrosion rate. The corrosion rate is measured using the weight loss method. Micro-photo observations of the S45C steel surface were carried out to determine the type of corrosion. The results demonstrate that the corrosion rate of hardened S45C steel decreases following the longer holding time during hardening. In addition, the corrosion rate of hardened S45C steel decreases when the viscosity of the oil used during hardening is thicker. Finally, the type of corrosion is uniform and pitting corrosion.","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":"47533914","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.2022.14.3.326
S. Spinu
Due to model complexity, classical contact mechanics theory assumes isothermal contact processes, involving bodies with uniform temperatures and no heat transmitted or generated through or near the contact interface. This paper addresses the problem of frictional heating in non-conforming or rough contacts by investigating the thermoelastic behaviour of asperities. The heat generated in a sliding contact by interfacial friction leads to thermoelastic distortion of the contact surface, further modifying contact parameters such as pressure, gap or temperature. The thermal expansion of the contacting bodies must therefore be accounted for when solving the contact problem. The thermoelastic displacement is computed with the aid of the half-space theory and of fundamental solutions for point sources of heat located at the free surface, derived in the literature of heat conduction in solids. The linearity of conduction equations encourages the use of superposition principle in the same way as for the elastic displacement. As the thermoelastic displacement is expressed mathematically as a convolution product, methods derived in contact mechanics for elastic displacement calculation are adapted to the heat conduction equations. The influence coefficients needed to efficiently compute the convolution products are derived, and the Discrete Convolution Fast Fourier Transform technique is applied to improve the algorithm computational efficiency. A similar method is then advanced for the temperature rise on the contact interface due to arbitrary heat input. The predictions of the newly advanced computer programs are tested against existing closed-form solutions for uniform circular or ring heat sources, and a good agreement is found.
{"title":"\"THERMOELASTIC DISPLACEMENT AND TEMPERATURE RISE IN A HALF-SPACE DUE TO A STEADY-STATE HEAT FLUX \"","authors":"S. Spinu","doi":"10.54684/ijmmt.2022.14.3.326","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.326","url":null,"abstract":"Due to model complexity, classical contact mechanics theory assumes isothermal contact processes, involving bodies with uniform temperatures and no heat transmitted or generated through or near the contact interface. This paper addresses the problem of frictional heating in non-conforming or rough contacts by investigating the thermoelastic behaviour of asperities. The heat generated in a sliding contact by interfacial friction leads to thermoelastic distortion of the contact surface, further modifying contact parameters such as pressure, gap or temperature. The thermal expansion of the contacting bodies must therefore be accounted for when solving the contact problem. The thermoelastic displacement is computed with the aid of the half-space theory and of fundamental solutions for point sources of heat located at the free surface, derived in the literature of heat conduction in solids. The linearity of conduction equations encourages the use of superposition principle in the same way as for the elastic displacement. As the thermoelastic displacement is expressed mathematically as a convolution product, methods derived in contact mechanics for elastic displacement calculation are adapted to the heat conduction equations. The influence coefficients needed to efficiently compute the convolution products are derived, and the Discrete Convolution Fast Fourier Transform technique is applied to improve the algorithm computational efficiency. A similar method is then advanced for the temperature rise on the contact interface due to arbitrary heat input. The predictions of the newly advanced computer programs are tested against existing closed-form solutions for uniform circular or ring heat sources, and a good agreement is found.","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":"45207915","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.2022.14.2.30
C. Cristoiu, Stan Laurentiu, Ivan Mario
To calculate joints angles of an articulated arm robot, when the coordinates of the point to be reached are known, different calculation methods or iterative algorithms for inverse kinematics (IK) can be used. IK requires that the dimensions of the robot segments and the initial positions of the joints to be known, described, and implemented mathematically, so it is based on the geometric model of the robot. In practice, the geometric modeling of the robots is done considering that all their structural elements are rigid, and their dimensions and positions are considered constant (while in reality the robots suffer certain deformations that can have different causes). This article considers the thermal deformations that a robot suffers during operation which are leading to positioning errors. The deformations are variable during the warm-up period of the robot and become constant after reaching the thermal stabilization level. From this point of view, if it is desired to consider and possibly compensate these thermal induced errors, the elaboration of the geometric model of the robot in the classical way is no longer possible and the geometric parameters must be somehow described as variables. Thermal deformations produce displacements and torsions of the robot elements. Linear and angular deviations may occur from the initial (theoretical) position in all 3 directions of the cartesian axis systems used in robot modeling. This paper presents a technique for creating a virtual model of the ABB IRB140 robot in CoppeliaSim, programming and modeling environment, with the positioning of the axis systems attached to the joints identical to the real position (unlike simplified versions of Denavit-Hartenberg geometric models) and the logic of a custom written software algorithm for automatic deformation of the model.
{"title":"VIRTUAL GEOMETRIC MODEL WITH DYNAMIC PARAMETERS FOR 6 DOF ARTICULATED ARM ROBOT","authors":"C. Cristoiu, Stan Laurentiu, Ivan Mario","doi":"10.54684/ijmmt.2022.14.2.30","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.30","url":null,"abstract":"To calculate joints angles of an articulated arm robot, when the coordinates of the point to be reached are known, different calculation methods or iterative algorithms for inverse kinematics (IK) can be used. IK requires that the dimensions of the robot segments and the initial positions of the joints to be known, described, and implemented mathematically, so it is based on the geometric model of the robot. In practice, the geometric modeling of the robots is done considering that all their structural elements are rigid, and their dimensions and positions are considered constant (while in reality the robots suffer certain deformations that can have different causes). This article considers the thermal deformations that a robot suffers during operation which are leading to positioning errors. The deformations are variable during the warm-up period of the robot and become constant after reaching the thermal stabilization level. From this point of view, if it is desired to consider and possibly compensate these thermal induced errors, the elaboration of the geometric model of the robot in the classical way is no longer possible and the geometric parameters must be somehow described as variables. Thermal deformations produce displacements and torsions of the robot elements. Linear and angular deviations may occur from the initial (theoretical) position in all 3 directions of the cartesian axis systems used in robot modeling. This paper presents a technique for creating a virtual model of the ABB IRB140 robot in CoppeliaSim, programming and modeling environment, with the positioning of the axis systems attached to the joints identical to the real position (unlike simplified versions of Denavit-Hartenberg geometric models) and the logic of a custom written software algorithm for automatic deformation of the model.","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":"42026480","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.2022.14.2.83
Danut - Sorin Ionel, C. Opran
Industrial automation refers to the control of machines and processes in order to manage variables. Automated manufacturing systems have evolved as advanced technologies have been incorporated, and theoretical approaches have evolved from mass production to intelligent manufacturing, each step introducing superior manufacturing concepts and models, which allowed increasing processes, organization and work. One of the newest approaches refers to distributive automation, in which the system allows reconfiguration and self-organization of autonomous subsystems in a distribute environment. By incorporating integrative Industry 4.0 technologies, an automated industrial system becomes an intelligent, fully digitized and reconfigurable manufacturing applications platform. At the same time, through digitization and virtualization, the automated manufacturing system can employ the Advanced Lean Manufacturing conceptual support. This paper addresses the transforming challenges of an existing automated manufacturing system to the Advanced Lean adaptive automated manufacturing level, taking into account the limits due to attributes, properties and capabilities of physical manufacturing assets. The proposed solution describes a versatile and dynamic architecture, which allows the organization / reorganization of manufacturing flows, scalability and connection with the external environment, according to advanced cyber manufacturing requests.
{"title":"TRANSFORMING STRATEGY FROM INDUSTRIAL AUTOMATION TO ADVANCED LEAN AUTOMATION","authors":"Danut - Sorin Ionel, C. Opran","doi":"10.54684/ijmmt.2022.14.2.83","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.83","url":null,"abstract":"Industrial automation refers to the control of machines and processes in order to manage variables. Automated manufacturing systems have evolved as advanced technologies have been incorporated, and theoretical approaches have evolved from mass production to intelligent manufacturing, each step introducing superior manufacturing concepts and models, which allowed increasing processes, organization and work. One of the newest approaches refers to distributive automation, in which the system allows reconfiguration and self-organization of autonomous subsystems in a distribute environment. By incorporating integrative Industry 4.0 technologies, an automated industrial system becomes an intelligent, fully digitized and reconfigurable manufacturing applications platform. At the same time, through digitization and virtualization, the automated manufacturing system can employ the Advanced Lean Manufacturing conceptual support. This paper addresses the transforming challenges of an existing automated manufacturing system to the Advanced Lean adaptive automated manufacturing level, taking into account the limits due to attributes, properties and capabilities of physical manufacturing assets. The proposed solution describes a versatile and dynamic architecture, which allows the organization / reorganization of manufacturing flows, scalability and connection with the external environment, according to advanced cyber manufacturing requests.","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":"45307305","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.2022.14.2.240
M. Stanciu, Eduard Gheres, Antoanela Lungu, I. Tismanar, V. G. Gliga
Numerous studies on new and historical violins have highlighted the importance of coatings for the acoustics of the musical instrument. The purpose of this paper is to present the results regarding the surface energy of resonant wood, spruce and maple in two states: lacquered and unvarnished. The method is based on static contact angle measurements of sessile drops. The obtained results highlight large differences in surface energy depending on the wood section (radial versus longitudinal), surface (lacquered versus unvarnished), wood species. Thus, although the surfaces are polar for both unpainted and lacquered samples, it can be seen that there is a tendency to increase the contact angle after applying the surface treatment (applying the varnish). In the case of spruce wood cut in the longitudinal direction, the contact angle increases by about 31% in the case of the lacquered surface. For maple wood, the increase is 10%. For radially cut spruce wood samples, it is observed that the contact angle is higher than 90°, the surface having a hydrophobic character, a characteristic that is not found in maple wood. The application of the varnish on the radial surface diminishes the hydrophobic characteristics of the spruce wood. In maple wood, the difference between the longitudinal and radial samples is very small (2%).
{"title":"\"THE SURFACE ENERGY OF COATING LAYERS USED FOR VIOLINS VARNISHING \"","authors":"M. Stanciu, Eduard Gheres, Antoanela Lungu, I. Tismanar, V. G. Gliga","doi":"10.54684/ijmmt.2022.14.2.240","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.240","url":null,"abstract":"Numerous studies on new and historical violins have highlighted the importance of coatings for the acoustics of the musical instrument. The purpose of this paper is to present the results regarding the surface energy of resonant wood, spruce and maple in two states: lacquered and unvarnished. The method is based on static contact angle measurements of sessile drops. The obtained results highlight large differences in surface energy depending on the wood section (radial versus longitudinal), surface (lacquered versus unvarnished), wood species. Thus, although the surfaces are polar for both unpainted and lacquered samples, it can be seen that there is a tendency to increase the contact angle after applying the surface treatment (applying the varnish). In the case of spruce wood cut in the longitudinal direction, the contact angle increases by about 31% in the case of the lacquered surface. For maple wood, the increase is 10%. For radially cut spruce wood samples, it is observed that the contact angle is higher than 90°, the surface having a hydrophobic character, a characteristic that is not found in maple wood. The application of the varnish on the radial surface diminishes the hydrophobic characteristics of the spruce wood. In maple wood, the difference between the longitudinal and radial samples is very small (2%).","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":"46016965","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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