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并联运动机械结构综合及其优化设计研究的最新进展
总被引:1,自引:1,他引:0
Shen Huiping Zhang Shu Liu Anxing Yang Tingli.Jiangsu Polytechnic University Changzhou Jiangsu .Jiangsu Province Key Lab.for Digital Manufacturing Technology Huaiying Jiangsu .Tongji University Shanghai .PLA Scince Technology Nanjing .Sinopec Jinling Petrochemical Corporation Nanjing 《中国机械工程》2009,20(1):0-125
综合评述了以德国为主的欧洲工业国在并联运动机械结构综合与设计方面的最新研究成果与进展,内容涉及:针对实际应用背景提出新机型并进行了设计;通过研制设计分析仿真软件,针对某种并联运动机械机型进行了结构综合改进与优化、尺度综合和优化以及性能评估与改善等工作;进一步地,在大量实践与理论探索的基础上,较系统地提出用于开发混合运动机械、冗余并联运动学以及可重构并联运动机械的设计方法学,这些内容都是并联运动机械设计研究领域内富有创造性的成果。
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二元疲劳失效判据认为疲劳破坏是由损伤程度和当前作用应力这两个量共同决定的,由此观点出发定义了非线性损伤,并建立了与载荷状态有关的非线性损伤累积模型,推导了在多级加载下的递推公式。经两种金属材料的疲劳试验数据验证表明,用该模型预测疲劳寿命,其结果是令人满意的。从疲劳过程本质上是材料静强度不断退化的过程的观点出发,建立了基于二元疲劳失效判据的非线性强度退化模型,将模型应用于两级及多级载荷下的剩余寿命估算,结果表明,所提出的剩余强度退化模型是合理可行的。
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设计制造出IC芯片粘片机焊头机构的实验平台.采用图像处理的方式来测量焊头的运动精度和定位精度等参数。实验结果表明:所设计的机构能满足IC芯片粘片机的工作要求,各项性能指标均达到了设计标准。 相似文献
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Li Fang Yue Hong Yin Zhao Neng Chen 《The International Journal of Advanced Manufacturing Technology》2008,35(11-12):1136-1144
Wire bonding has been one of the standard operations in plastic integrated circuit (IC) package assembly for a long time. With the development of IC assembly technology, the equipment of wire bonding should be improved for even higher performance. Thus, a novel linear wire bonding head driven by a permanent magnet linear motor (PMLM), instead of the rotary bonding structure, is designed to optimize the system structure and improve the performance of wire bonding. Based on two different wire bonding states, the switching control scheme corresponding to this linear structure is presented. In free motion, the position tracking control suppressing the vibration of flexible parts of the structure is performed at high speed and acceleration. In constrained motion, the active force control with direct contact force feedback is adopted for more precise bonding force compared with the indirect current feedback control in previous rotary structure. The experiment results show higher performance of wire bonding because of the combination of novel linear structure and control scheme. 相似文献
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电机作为汽车电动助力转向系统中的动力元件,与整个系统进行有效的匹配显得十分重要。介绍汽车电动助力转向系统微特电机的种类和特点,提出电机与汽车电动助力转向系统之间的匹配方法,包括电压、转矩、转速、功率、电流脉宽调制、结构等的匹配。 相似文献
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Trypanosoma brucei is a protozoan flagellate that causes African sleeping sickness. Flagellar function in this organism is critical for life cycle progression and pathogenesis, however the regulation of flagellar motility is not well understood. The flagellar axoneme produces a complex beat through the precisely coordinated firing of many proteins, including multiple dynein motors. These motors are found in the inner arm and outer arm complexes. We are studying one of the inner arm dynein motors in the T. brucei flagellum: dynein-f. RNAi knockdown of genes for two components of dynein-f: DNAH10, the α heavy chain, and IC138, an intermediate chain, cause severe motility defects including immotility. To determine if motility defects result from structural disruption of the axoneme, we used two different flagellar preparations to carefully examine axoneme structure in these strains using transmission electron microscopy (TEM). Our analysis showed that inner arm dynein size, axoneme structural integrity and fixed central pair orientation are not significantly different in either knockdown culture when compared to control cultures. These results support the idea that immotility in knockdowns affecting DNAH10 or IC138 results from loss of dynein-f function rather than from obvious structural defects in the axoneme. 相似文献
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贴装头位置校准是贴片机中元件贴装前关键的一步 ,目的是通过上照视觉系统检测贴装头中心以使其与之同心 ,从而保证元件贴装精度。研究出一种采用绕贴装头中心旋转、并等角度分布于圆周上的多幅图像信息 ,根据正多边形几心合一的特点 ,把贴装头中心定位到亚像素级精度 ,实现了高精度贴装头位置校准 ,同时分析了机械传动系统精度对校准过程的影响。 相似文献
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JC120DB交流变频驱动单轴绞车在主轴装置的两端分别有两台变频电机,电机通过联轴器与悬吊式一级半行星减速器的两个输入轴相连,经两级减速后通过齿轮离合器与主轴联接,在行星减速器与主轴之间有液压齿轮离合器.JC120DB绞车综合运用了行星减速技术、全数字交流变频控制技术、能耗制动与盘刹技术、自动送钻、智能软启动等新技术,整体技术性能先进,并具有体积小、质量轻、结构简单、效率高、使用维护简单、自动化程度高等特点. 相似文献
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Tung-Hsu Hou Shyh-Huei Chen Tzu-Yu Lin Kun-Ming Huang 《The International Journal of Advanced Manufacturing Technology》2006,30(3-4):247-253
The wire bonding process is the key process in an IC chip-package. It is an urgent problem for IC chip-package industry to improve the wire bonding process capability. In this study, an integrated system is proposed to identify and control parameters in the wire bonding process in order to achieve high level performance and quality. First, an experimental design with Taguchi method is applied to identify the critical parameters in the wire bonding process. Then, an ANN is used to establish the nonlinear multivariate relationships between wire boning parameters and responses. Finally, a GA is adopted to find the most desired parameter settings by using the output of ANN as the fitness measure. Another popular method, response surface method, for parameter design problems is conducted for comparison purpose. Results of this comparison demonstrate the effectiveness of the proposed approach. 相似文献
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《Measurement》2016
Single-phase induction motors are used in the industry commonly. Induction motors are not expensive, so it is a reason to use them. Diagnostics of faults is very important. It prevents financial loss and unplanned downtimes causes by faults. In this paper the authors described fault diagnostic techniques of the single-phase induction motor. Presented techniques were based on the analysis of thermal images of electric motor. The authors measured and analysed 3 states of the single-phase induction motor. In this paper an original method of the feature extraction of thermal images called MoASoS (Method of Area Selection of States) was presented. The proposed method - MoASoS and an image histogram were used to form feature vectors. Classification of the obtained vectors was performed by NN (Nearest Neighbour classifier) and Gaussian Mixture Models (GMM). The described fault diagnostic techniques are useful for reliability of the single-phase induction motors and other rotating electrical machines such as: three-phase induction motors, synchronous motors, DC motors. 相似文献