现代机械工程(英文)最新文献

{"title":"STEM and other Fields of Study","authors":"K. Wong, T. Kuhn","doi":"10.15377/2409-9848.2015.02.01.4","DOIUrl":"https://doi.org/10.15377/2409-9848.2015.02.01.4","url":null,"abstract":"","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"2 1","pages":"26-29"},"PeriodicalIF":0.0,"publicationDate":"2015-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286082","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}

{"title":"Assessment Tests for Digital Skills: A Tool for Learning Outcomes and University Accreditation","authors":"K. Wong","doi":"10.15377/2409-9848.2015.02.01.1","DOIUrl":"https://doi.org/10.15377/2409-9848.2015.02.01.1","url":null,"abstract":"","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"2 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2015-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286422","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}

{"title":"Clamping Connection between Flexible Electrodes and External Wires","authors":"Z. Gaofeng, Cui Lujun, Z. Zexiang, L. Zhiqiang","doi":"10.15377/2409-9848.2015.02.01.3","DOIUrl":"https://doi.org/10.15377/2409-9848.2015.02.01.3","url":null,"abstract":"","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"2 1","pages":"16-25"},"PeriodicalIF":0.0,"publicationDate":"2015-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286008","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}

{"title":"Virtual Media Quality Index (W-Index) for Higher Institutions of Education","authors":"K. Wong, S. Ginkel","doi":"10.15377/2409-9848.2015.02.01.2","DOIUrl":"https://doi.org/10.15377/2409-9848.2015.02.01.2","url":null,"abstract":"","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"2 1","pages":"11-15"},"PeriodicalIF":0.0,"publicationDate":"2015-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286469","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}

{"title":"Investigation of Hot Formability of AZ61 Mg Alloy","authors":"M. Ramezani, T. Neitzert","doi":"10.4236/MME.2015.52003","DOIUrl":"https://doi.org/10.4236/MME.2015.52003","url":null,"abstract":"High temperature mechanical properties and formability of the AZ61 magnesium alloy are evalu-ated in this paper. Tensile tests were conducted to obtain the formability parameters at elevated temperatures of up to 400℃. The results showed that at higher temperature, yield strength and ultimate tensile strength of the material decrease significantly, while the material experiences an increase in ductility (maximum elongation before break). A model has been created in finite ele-ment software Abaqus to further study the deep drawability of the AZ61 Mg alloy. Effects of dif-ferent process parameters such as punch and die geometry, forming speed and temperature as well as blank-holder force on square cup drawing of the AZ61 alloy were investigated and optimum process parameters are obtained which can be used as a design guide in sheet metal forming industry.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"05 1","pages":"21-27"},"PeriodicalIF":0.0,"publicationDate":"2015-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497468","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}

{"title":"Dry Friction with Various Frictions Laws: From Wave Modulated Orbit to Stick-Slip Modulated","authors":"P. Kluge, D. Germaine, K. T. Crépin","doi":"10.4236/MME.2015.52004","DOIUrl":"https://doi.org/10.4236/MME.2015.52004","url":null,"abstract":"Choices of excitation signals are important in engineering sciences and in physical simulations; a sufficient excitation can be critical in modelling a complicated nonlinear dynamic system. The discontinuous dynamic of a non-linear, friction-induced with two idealized periodical forced oscillators is studied. The dry friction in the system follows the classical Coulomb law, and various friction characteristics of dry friction laws in engineering sciences. To capture the presence of the two driving forces, the system must be studied as a function of their frequency-modulated and its equivalent amplitude modulated waveforms. Our numerical investigation shows a rich dynamical behaviour including periodic, quasi-periodic motions, thus a variable dynamics phenomenon among others; such as modulated waves, modulated stick-slip, periodic oscillation, and periodic stick-slip. It seems that such excitation forces can be used to conveniently identify the existence of nonlinearity, dry friction effects, and strength degradation in the system. The results achieved via the Coulomb’s law are compared with those obtained via two others particular friction laws: the complete model with Stribeck effect and Coulomb viscosity.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"05 1","pages":"28-40"},"PeriodicalIF":0.0,"publicationDate":"2015-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497541","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}

{"title":"An ARX-Based PID-Sliding Mode Control on Velocity Tracking Control of a Stick-Slip Pi-ezoelectric-Driven Actuator","authors":"Y. Cao, X. Chen","doi":"10.4236/MME.2015.51002","DOIUrl":"https://doi.org/10.4236/MME.2015.51002","url":null,"abstract":"Piezoelectric-driven stick slip actuators have been drawn more and more attention in the nano- positioning application due to the high accuracy and theoretical unlimited displacement. However, the hysteresis of piezoelectric actuator (PEA) and the nonlinear friction force between the end- effector and the stage make control of piezoelectric-driven stick slip actuator challenge. This paper presents the development of an autoregressive exogenous (ARX)-based proportional-integral-derive (PID)-sliding mode control (SMC) for the velocity tracking control of the piezoelectric-driven stick slip actuator. Stability is guaranteed by rigorously choosing the appropriate PID parameters and the zero steady state error is achieved. To verify the effectiveness of the proposed method, experiments were carried out on a commercially-available piezoelectric-driven stick slip actuator. The tracking errors were compared with the traditional PID controller, illustrating that in spite of existing of modeling error, the ARX-based PID-SMC is able to better improve the velocity tracking performance of piezoelectric-driven stick slip actuator, compared with the traditional PID controller.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"5 1","pages":"10-19"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497452","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}

{"title":"Stress Analysis of Thin-Walled Pressure Vessels","authors":"A. Ibrahim, Y. Ryu, Mir Saidpour","doi":"10.4236/MME.2015.51001","DOIUrl":"https://doi.org/10.4236/MME.2015.51001","url":null,"abstract":"This paper discusses the stresses developed in a thin-walled pressure vessels. Pressure vessels (cylindrical or spherical) are designed to hold gases or liquids at a pressure substantially higher than the ambient pressure. Equations of static equilibrium along with the free body diagrams will be used to determine the normal stresses in the circumferential or hoop direction and in the longitudinal or axial direction. A case study of internal pressure developed in a soda can was determined by measuring the elastic strains of the surface of the soda can through strain gages attached to the can and connected to Strain indicator Vishay model 3800.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"05 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70496923","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}

{"title":"Defects and Remedies in Stamping of Advanced High Strength Steels","authors":"F. Ozturk, I. Kacar, F. Jarrar","doi":"10.15377/2409-9848.2014.01.02.4","DOIUrl":"https://doi.org/10.15377/2409-9848.2014.01.02.4","url":null,"abstract":"Abstract: In recent years, the use of advanced high strength steels (AHSS) in the automotive industry has increased due to their potential in reducing weight, leading to lower fuel consumption and carbon dioxide emissions. The AHSS structures would be the optimum choice for many applications; however, there are many defects to overcome in their stamping. In this present study, different types of defects and remedies of AHSS stampings are presented. Keywords: Advanced high strength steel, AHSS, Failure analysis, Damage behavior of multiphase steels, Failure prediction. 1. INTRODUCTION Lightweight materials, such as composites, aluminum, and magnesium alloys are commonly used in the automotive and aerospace industries. However, when lower density materials (such as Al and Mg alloys) are used, thicker parts are required to compensate for their lower strength. In addition, there are some difficulties in the cold forming of such low-density alloys. After the oil crisis in the 1970s, the steel industry has started to develop the dual-phase (DP) steels (ferritic-martensitic) in order to decrease fuel consumption and exhaust tail pipe emissions. DP steels are part of broader type of steels which are known as advanced high strength steels. These AHSS offer up to five times the strength relative to the mild steels. Therefore, they can be an attractive alternative to lightweight materials in achieving lightweight structuring. Obviously, AHSS are not considered to be lightweight materials, however; due to their high yield strength, the sheet thicknesses can be significantly reduced and consequently weight reduction can be achieved. Advanced high strength steel tubes are currently used as side impact door beams, seat structures, and instrument panel beams in automobiles [1]. AHSS have been being increasingly used in automobile structural components due to their corrosion resistance, toughness, and high resistance to impact. In specific, Martensitic Steels (MS) are typically used to provide collision protection by minimizing the deformation from sideward impacts [2]. A more extensive use of AHSS in the automotive industry would cause a significant reduction in weight without","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"1 1","pages":"68-74"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286371","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}

{"title":"Vibro-Acoustic Formulation of Elastically Restrained Shear Deformable Orthotropic Plates Using a Simple Shear Deformation Theory","authors":"T. Kam, A. Nayan","doi":"10.15377/2409-9848.2014.01.02.2","DOIUrl":"https://doi.org/10.15377/2409-9848.2014.01.02.2","url":null,"abstract":"","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"1 1","pages":"49-57"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286036","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}