检索结果-南通市图书馆

STUDY ON SHIFT SCHEDULE AND SIMULATION OF automatic TRANSMISSION

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of mechanical engineering 2001年第3期14卷 250-253页

作者： Gong Jie,Zhao Dingxuan (college of mechanical Science and engineering ,Jilin university) 吉林大学机械科学与工程学院吉林长春

From the point of view of saving energy, a new shift schedule and auto-controlling strategy for automatic transmission are proposed. In order to verify this shift schedule, a simulation program using a software package of Matlab/ Simulink is developed. The simulation results show the shift schedule is correct. This shift schedule has enriched the theory of vehicle automatic maneuvering and will improve the efficiency of hydrodynanic drive system of the vehicle.

关键词： engineering vehicle automatic transmission Shift schedule Simulation Saving energy

SURFACE ROUGHNESS EFFECTS IN ALUMINIUM ROLLING

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1996年第3期6卷 157-160页

作者： Tan Jianping Zhong Jue Yang Ping(college of mechanical and Electrical engineeringCentral South university of Technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉ... 详细信息

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇＣｅｎｔｒａｌＳｏｕ...

关键词： rolling oil film thickness surface roughness

ON THE CALCULATION OF STRESS INTENSITY FACTOR K FOR FRAME COMPONENTS

在线全文

学校读者我要写书评

暂无评论

Journal of Central South university 1995年第2期7卷 37-41页

作者： Liu Yilun Wang Ailun(college of mechanical and Electrical engineering, Central South university of Technology, changsha, 410083, china)He Manjiang(changsha Institute of Mining Research) 1. college of mechanical and Electrical engineering Central South University of Technology 410083 Changsha China 2. changsha Institute of Mining Research China

The stress intensity factor K in the tip of crack which is in the corner of the frame component has been calculated indirectly by means of numeric calculation of J Integral. Some laws and relationships among the stres... 详细信息

关键词： intensity factor J Integral frame component

A Non-Gradient Approach to Topological Design Involving Impact

在线全文

学校读者我要写书评

暂无评论

A Non-Gradient Approach to Topological Design Involving Impa...

The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics

作者： Qing Li School of engineering, James Cook university, Townsville, QLD 4811, Australia college of mechanical & Automotive engineering, hunan university, changsha, 410082, china

Over the past decade remarkable progress has been made in the development of software used in crash simulation and analysis. A number of commercial codes have been available with accepted accuracy. However, there has been little report in its inverse problem yet, i.e. topological and shape optimization for crash worthiness. The difficulty is primarily raised from two folders on 1) the nonlinear sensitivity analysis and computational cost [1], which become particularly challenging in various topological designs;2) dynamic multi-modals and non-convex design space, which do not lend the crash problems themselves well to classical gradient techniques. The paper aims at developing an alternative approach to the crashworthiness design problems. The Evolutionary Structural Optimization (ESO) [2] will be applied to reduce the dependence on the continuum sensitivities.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

钢纤维水泥砂浆钢筋网加固RC方柱试验研究

沈阳建筑大学学报(自然科学版) 2011年第3期27卷 430-435页

作者：卜良桃毛海斌湖南大学土木工程学院

目的研究钢纤维水泥砂浆(SFCM)钢筋网加固法加固RC方柱的力学性能以及影响因素.方法对4根RC方柱采用钢纤维水泥砂浆钢筋网进行加固,在5 000 kN反力架上进行轴心抗压一次受力试验,并与另外2根未加固柱试验结果进行对比.结果 SFCM钢筋网... 详细信息

目的研究钢纤维水泥砂浆(SFCM)钢筋网加固法加固RC方柱的力学性能以及影响因素.方法对4根RC方柱采用钢纤维水泥砂浆钢筋网进行加固,在5 000 kN反力架上进行轴心抗压一次受力试验,并与另外2根未加固柱试验结果进行对比.结果 SFCM钢筋网加固法能大幅提高钢筋混凝土柱的极限承载能力、峰值应变、开裂荷载、延性,其中轴心抗压极限承载力提高幅度最小为53%,最大为103%;有效改善被加固柱裂缝的分布形态及破坏形态,使裂缝由不加固的疏而宽变得密而细.结论 SFCM钢筋网加固法可大幅提高构件的极限承载力,改善构件延性,约束构件裂缝发展;给出了受压承载力计算方法,利用该方法所得计算值与试验结果吻合较好.

关键词：钢纤维水泥砂浆加固 RC方柱一次受力

Laser surface hardening of ductile cast iron for vehicle die

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Laser surface hardening of ductile cast iron for vehicle die

Analysis of a piezoelectric screw dislocation inside an elliptical inhomogeneity with confocal rigid line in piezoelectric material

2010亚洲光电子会议高功率激光器及其应用分会场

作者： Yanghui Xu a b Jichang Liu *a b a State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body hunan university changsha 410082 china b Institute of Advanced Shaping and Surface engineering college of mechanical and Vehicle engineering hunan university changsha 410082 china

Experiments of laser transformation hardening were performed with various process parameters on the surface of ductile cast iron block,which is often used for vehicle *** distribution of microhardness along the case depth direction and the variation of microstructure of hardened track were *** test was carried out using a ball-on-flat-type wear-test *** results indicate that the hardened layers after the laser surface hardening treatment have excellence wear *** is seen that the surface hardness of ductile cast iron blocks increases greatly at suitable values of process parameters in laser transformation hardening,which satisfies the vehicle dies.

关键词： laser surface hardening die microstructure wear resistance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2011年第6期1卷 10-13页

作者： Chunzhi Jiang,1,2,3, ) Chao Xie,1,2 Youwen Liu,1,2 and Xin Zeng1,2 1)State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, hunan university, changsha 410082, china 2)college of mechanical and Vehicle engineering, hunan university, changsha 410082, china 3)Department of Physics and Electronic Information engineering, Xiangnan university, Chenzhou 423000, china Department of Physics and Electronic Information engineering Xiangnan University Chenzhou 423000 China

This paper deals with the electro-elastic coupling interaction between a piezoelectric screw dislocation which is located inside the elliptical inhomogeneity and an electrically conductive confocal rigid line under remote anti-plane shear stresses and in-plane electrical loads in piezoelectric composite material. The analytical-functions of the complex potentials, stress fields and the image force acting on the piezoelectric screw dislocation are obtained based on the principle of conformal mapping, the method of series expansion, the technical of analytic continuation and the analysis of singularity of complex potentials. The rigid line and the piezoelectric material property combinations upon the image force and the equilibrium position of the dislocation are discussed in detail by the numerical computation.

关键词： complex variable method rigid line piezoelectric material piezoelectric screw dislocation elliptical inhomogeneity

OPTIMAL CONTROL OF AN ACTIVE SUSPENSION SYSTEMEMPLOYING HIGH SPEED ON/OFF SOLENOID VALVE

在线全文

学校读者我要写书评

暂无评论

Journal of Central South university 1997年第2期9卷 137-140页

作者： Liu Shaojun Zhong Jue Li Qingchun (college of mechanical and Electrical engineering,Central South university of Technology, changsha 410083, china)HironaoYAMADA YoshikazuSUEMATSU(NAGOYAuniversity Japan) college of mechanical and Electrical engineering Central South University of Technology Changsha 410083 China NAGOYA university Japan

Previous studies have confirmed that an active suspension system with high speed ON/OFF solenoid valves could provide the same vibration isolation efficiency as that of system with pressure proportional valve. In this study, by using Linear-quadratic optimization technique and Kalman filter method, an optimal regulator controller with a state observer was designed for the proposed system. Simulation and experimental research was conducted on a quarter car model. The simulation analysis of the system frequency characteristic suggested that the peak value of magnitude response curve in the case of system with an optimal controller would be lowered significantly, and the experiment results also showed that an improvement in the vibration isolation effect was obtained in using the designed optimal controller over the sky hook damper controller.

关键词： active suspension high speed ON/OFF solenoid valve optimal control

Effects of MoS_2 on mechanical and tribological properties of NiCr-based alloys

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2000年第3期10卷 328-327,329-331页

作者： XIONG Dang sheng(熊党生) 1, PENG Chao qun(彭超群) 2, LIU Jin long(刘金龙) 1 1. college of mechanical engineering, china university of Mining and Technology, Xuzhou 221008, P.R.china 2. State Key Lab for Powder Metallurgy, Central South Unive china Univ Min & Technol Coll Mech Engn Xuzhou 221008 Peoples R China Cent S Univ Technol State Key Lab Powder Met Changsha 410083 Peoples R China

Ni Cr based alloys with a wide temperature range self lubrication were made by hot pressing the mixture powder of alloyed Ni Cr powder, elemental Mo, Al, Ti and B powders and MoS 2 powder. The mechanical and tribological properties of these alloys when rubbing with Al 2O 3 ceramics and W18Cr4V high speed steel were measured in the temperature range of 20～700 ℃, and the mechanisms of self lubrication and wear resistance were studied. The results showed that the alloy containing 10% MoS 2 has the best combination of mechanical properties, antifriction and wear resistance. Over a wide temperature range from 20 ℃ to 700 ℃, when rubbing with Al 2O 3, its friction coefficient and wear rate are 0.19～0.3 and (1.1～1.5)10 -14 m 3/(N·m), respectively; when rubbing with the high speed steel, those values are 0.18 ～ 0.26 and (0.6～3.2)×10 -15 m 3/(N·m), respectively.

关键词： Ni Cr based alloys molybdenum disulfide self lubrication tribological properties