发布求助
文献互助 智能选刊 最新文献

Bulletin of the Polytechnic Institute of Iași. Machine constructions Section最新文献

筛选
英文 中文
A Study on the Evolution of the Supplying Current Absorbed By an AC Driving Motor During a Transient Regime on a Lathe Headstock Gearbox 车床主轴箱齿轮箱交流驱动电机瞬态吸收电流演变研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0002
N. Bumbu, M. Horodinca
{"title":"A Study on the Evolution of the Supplying Current Absorbed By an AC Driving Motor During a Transient Regime on a Lathe Headstock Gearbox","authors":"N. Bumbu, M. Horodinca","doi":"10.2478/bipcm-2022-0002","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0002","url":null,"abstract":"Abstract This paper focuses on the evolution of instantaneous supplying current absorbed by an AC motor used to drive a lathe headstock gearbox during a transient regime characterised by a strong acceleration and deceleration and a strong variations of the absorbed active electrical power (with positive and negative power flows). A relationship between the current root mean square and active electrical power evolutions was established and proved in experimental terms. A severe limitation of the electrical current evolution was revealed: the impossibility to describe a negative flow of absorbed electrical power.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115079272","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}
引用次数: 1
Analysis of Factors Influence on the Efficiency of the Burnishing Rolling Process 影响精轧工艺效率的因素分析
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0005
Mădălina-Cristina Popa
{"title":"Analysis of Factors Influence on the Efficiency of the Burnishing Rolling Process","authors":"Mădălina-Cristina Popa","doi":"10.2478/bipcm-2022-0005","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0005","url":null,"abstract":"Abstract Burnishing is a cold processing process that produces a good quality of the surface by the planetary motion of rolls hardened on turned or perforated surfaces. The result is a mirror surface with high wear and corrosion resistance, the surface of the part depends on several factors such as: ductility of the material, tensile strength, roughness of the workpiece surface before rolling, diameter and shape of the rollers (https://sinotech.com/resources/). Burnishing is the most suitable process to improve the fatigue resistance of dynamically requested parts. Because cold rolling does not remove material, then only the surface roughness rolls, influences the obtained roughness. That is why the roughness of the rolls will be equal to the roughness of the part. The cold rolling finishing method does not require the use of special machines, they can be used existing machines in the production sections such as: milling machines, lathes, drilling machines, lathes with numerical control (https://en.wikipedia.org/wiki/).","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"448 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446976","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}
引用次数: 0
Weigh-in-Motion Sensors and Traffic Monitoring Systems. State of the Art and Perspectives 运动称重传感器和交通监控系统。技术现状与展望
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0010
M. Mihaila, P. Barsanescu, C. Morăraș
{"title":"Weigh-in-Motion Sensors and Traffic Monitoring Systems. State of the Art and Perspectives","authors":"M. Mihaila, P. Barsanescu, C. Morăraș","doi":"10.2478/bipcm-2022-0010","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0010","url":null,"abstract":"Abstract Weigh-in-motion (WIM) sensors allow the control of vehicle weights without disruption of traffic. By monitoring traffic and by reducing the number of overweight vehicles, the WIM sensors bring very important savings. This paper discusses the present status and developmental trends of weigh-in-motion (WIM) technologies. Both commercial and new types of WIM sensors are presented. Strengths and weaknesses of different type of WIM sensors are discussed. It is also presented the tendency to equip the WIM systems with different types of sensors, in order to evaluate other effects: reducing the fuel consumption, emission of pollutants, noise and vibrations, etc. Possible trends for the further development of WIM sensors are anticipated.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128471331","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}
引用次数: 0
Cylindrical Roller Bearings with Optimized Profile Taking into Account the Material Structure and Operating Temperature 考虑材料结构和工作温度优化的圆柱滚子轴承
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0009
Andrei Popescu, Gabriel M Popescu
{"title":"Cylindrical Roller Bearings with Optimized Profile Taking into Account the Material Structure and Operating Temperature","authors":"Andrei Popescu, Gabriel M Popescu","doi":"10.2478/bipcm-2022-0009","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0009","url":null,"abstract":"Abstract The present paper proposes a method for an almost uniform pressure distribution between the rolling elements, based on the modification of the roller’s initial straight profile and accounting for material parameters related to the operating temperature. The optimization process is analyzed by including the possible misalignment and/or tilting angles of the roller due to operating conditions. A computer program was developed in the Borland C++ programming language. The contact pressure distribution is evaluated by using a three-dimensional contact analysis model based on the Boussinesq force-displacement relations for a half-space combined with the flexibility approach. For a fast analysis, the algorithm uses a Conjugate Gradient Method in deriving the contact pressures and the real contact area.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123516788","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}
引用次数: 0
Abrasion Resistance of Plastic Parts Manufactured By 3D Printing 3D打印塑料部件的耐磨性
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0003
A. Hrițuc, L. Slătineanu, A. Sover, A. Mihalache, I. Surugiu, M. Coteață
{"title":"Abrasion Resistance of Plastic Parts Manufactured By 3D Printing","authors":"A. Hrițuc, L. Slătineanu, A. Sover, A. Mihalache, I. Surugiu, M. Coteață","doi":"10.2478/bipcm-2022-0003","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0003","url":null,"abstract":"Abstract There are situations where parts manufactured by 3D printing processes must have a high abrasion resistance. To conduct experimental research on this subject, relatively simple test equipment for abrasive wear of pin-on-disk type was designed and materialized. The test pieces from the research material were pressed with known forces on the surface of a rotating abrasive paper disk. The test pieces were made of polyethylene terephthalate PET and polyethylene terephthalate carbon fiber reinforced PET CF15. As output parameters, the speed of decreasing the mass and the length of the test piece were used, respectively, for predetermined test durations. An experimental Taguchi L8 program was used, with 7 independent variables at two levels of variation. The experimental results were mathematically processed determined empirical mathematical models of the power function type. It was found that the strongest influence on the values of the output parameters was exerted by the average travel speed and by the granulation of the particles incorporated in the abrasive paper disk.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115298514","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}
引用次数: 1
Theoretical Model for Photovoltaic Panel Thermal Analysis 光伏板热分析理论模型
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0006
A G Lupu, E. Hristoforou, G. Tcaciuc, A. Popescu
{"title":"Theoretical Model for Photovoltaic Panel Thermal Analysis","authors":"A G Lupu, E. Hristoforou, G. Tcaciuc, A. Popescu","doi":"10.2478/bipcm-2022-0006","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0006","url":null,"abstract":"Abstract The process of energy conversion of incidental solar radiation to useful electric energy in photovoltaic (PV) panels is affected by several external factors, of which panel operational temperature is of utmost importance. The present study attempts to clarify the theoretical components of thermal behaviour of PV panels, by taking into account the detailed structure of thermal resistances of panel layers. The numerical model, developed from the theoretical analysis, shows a good agreement with experimental data provided by manufacturer for the photovoltaic panel Suntech STP280 - 24/Vd.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133398229","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}
引用次数: 2
A Computer Aided Design Software Comparative Study with Applications in Industry 4.0 – Smart Manufacturing 计算机辅助设计软件在工业4.0 -智能制造中的应用比较研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0004
M. Ciorap, Dogan Gures, C. Dumitraș
{"title":"A Computer Aided Design Software Comparative Study with Applications in Industry 4.0 – Smart Manufacturing","authors":"M. Ciorap, Dogan Gures, C. Dumitraș","doi":"10.2478/bipcm-2022-0004","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0004","url":null,"abstract":"Abstract The concept Industry 4.0 implies many elements such as CAD/CAM/CAE, simulation, additive fabrication, IoT (internet of things) and it was a result of the demands of the industry in decreasing the period of product designing, flexibility of the design, and quick response to the market demands.. With the help of CAD software, the design period for a new product was reduced by almost 30 percent. Based on this reason, the CAD software family was developed during the last twenty years giving the possibility to create more complex 3D models, parametrization and calculus for product cost or mechanical properties. One of the major drawback in having such a great number of companies that produce CAD software is that each one tries to individualize their own software. We can mention that there are over 150 types of CAD files format. This multitude of types of CAD software makes it necessary to carry out a comparative study to establish criteria for choosing one software or another. In this article we carried out such a study considering three of the most used software based on a case study – the design of a turning cutting tool.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124930582","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}
引用次数: 0
Comparison Between Prandtl’s Mixing Length Model and DNS Data for a Channel Flow Up to Reτ ≈ 5200 Reτ≈5200通道流量的Prandtl混合长度模型与DNS数据的比较
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0008
G. Tcaciuc, A. Elgarayhi, A G Lupu, A. Popescu
{"title":"Comparison Between Prandtl’s Mixing Length Model and DNS Data for a Channel Flow Up to Reτ ≈ 5200","authors":"G. Tcaciuc, A. Elgarayhi, A G Lupu, A. Popescu","doi":"10.2478/bipcm-2022-0008","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0008","url":null,"abstract":"Abstract This paper presents a theoretical study of fully developed turbulent flow in a channel at friction Reynolds numbers of 1000, 2000 and 5200. For the momentum equation, Reynolds Averaged Navier-Stokes (RANS) approach was used, where the Reynolds stress was modeled using Prandtl’s mixing length model with Van Driest’s modification to capture the damping effect near wall. The velocity profile was computed by solving the non-linear ODE for momentum using Euler’s method. The results were compared with the latest available DNS data.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133233690","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}
引用次数: 0
Optimization of Heat Dissipation for Fan Cooling Solution 风扇散热方案的散热优化
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0001
Cristina Georgiana Lateş, Cristina Mihaela Dragan, C. Dumitraș
{"title":"Optimization of Heat Dissipation for Fan Cooling Solution","authors":"Cristina Georgiana Lateş, Cristina Mihaela Dragan, C. Dumitraș","doi":"10.2478/bipcm-2022-0001","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0001","url":null,"abstract":"Abstract Today’s ECUs (Electronic Control Units) face a high-power density mounted in a very small volume due to miniaturisation, available space, and weight limitations. For this reason, the resulting heat dissipation has become increasingly difficult to manage and continuous efforts are being made to optimize thermal management in this direction. This paper shows an improvement in heat dissipation by finding an optimal configuration between the fan speed and the distance between the cooling fins using the Design for Six Sigma methods. The focus was on finding a reliable transfer function that could predict the influence of the identified critical design parameters. Two transfer functions were derived and analysed in parallel; one based on Design of Experiments (DoE) and another based on simplified thermal theory. The accuracy of the transfer function and predictions were compared with the results of thermal simulations performed in the Ansys Icepack program. This shows that the use of the DoE method based on a small number of simulations is sufficient to estimate the behaviour of the ECU, without using a more complex theoretical approach.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133800868","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}
引用次数: 0
Life Cycle Analyses for Solar Thermal Collectors 太阳能集热器的生命周期分析
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-03-01 DOI: 10.2478/bipcm-2022-0007
A G Lupu, M. Sallah, Cristina Belecciu, A. Popescu
{"title":"Life Cycle Analyses for Solar Thermal Collectors","authors":"A G Lupu, M. Sallah, Cristina Belecciu, A. Popescu","doi":"10.2478/bipcm-2022-0007","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0007","url":null,"abstract":"Abstract The current drive towards including renewable and sustainable energy sources into energy consumption mix implies thorough studies on savings in materials, energy and waste management. Life cycle analyses are concerned with identification and quantification of each inputs and outputs of a product manufacturing process. This paper proposes complex life cycle analyses, that include assessment on inventory, analyses of energy payback time, life cycle cost and end of life applied to solar thermal collectors, as part of a solar conversion system. Results show that the categories with most impact, besides terrestrial toxicity, are human health, global warming and depletion of fossil fuels, that is, the main reasons to implement renewable energy sources.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116352127","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}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信