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清华大学学报(自然科学版)  2018, Vol. 58 Issue (3): 298-304    DOI: 10.16511/j.cnki.qhdxxb.2018.25.011
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
风洞天平校准台并联复位机构精度分析
关立文, 陈晃, 付萌
清华大学 机械工程系, 北京 100084
Accuracy of the parallel reset mechanism in a wind tunnel balance calibration system
GUAN Liwen, CHEN Huang, FU Meng
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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摘要 并联机构由于具有结构简单和高刚度等优点,被大量应用于工程领域,该文针对风洞天平校准台6-DOF(degree of freedom)并联复位机构进行精度分析。利用D-H(Denavit-Hartenberg)方法分析每条支链运动传递过程,建立包含铰链制造误差的RRRPRR支链运动学模型。利用Qusai-Newton法分析不同结构参数下铰链制造误差对加载中心精度的影响规律。研究结果表明:加载中心精度与铰链偏移误差处于同一数量级,且呈线性关系;为降低铰链偏移误差对加载中心精度的影响,在满足设计要求的前提下,应选择较小定平台和较大动平台、较小平台铰链夹角以及较大的平台间距离。该研究为高精度风洞天平并联复位机构提供了重要的设计依据。
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关立文
陈晃
付萌
关键词 风洞天平复位机构精度分析铰链误差    
Abstract:A 6-DOF (degree of freedom) parallel machine was used as the reset mechanism in a wind tunnel balance calibration system because of its simple structure and stiffness. A model was developed using the D-H (Denavit-Hartenberg) convention to analyze inaccuracies in the reset mechanism caused by joint manufacturing tolerances. In this model, each closed-loop kinematic chain was treated as a RRRPRR chain. The effects of the joint tolerances and structural parameters on the kinematic accuracy were calculated based on Qusai-Newton method. Simulations indicate that the inaccuracy is on the same order of magnitude as the joint offsets. A principle is given to determine the structural parameters needed to improve the accuracy of this type of reset system.
Key wordswind tunnel balance    reset mechanism    accuracy analysis    joint tolerances
收稿日期: 2017-07-18      出版日期: 2018-03-14
ZTFLH:  TH13.2  
基金资助:国家自然科学基金资助项目(51675301)
作者简介: 关立文(1972-),男,副研究员。E-mail:guanlw@tsinghua.edu.cn
引用本文:   
关立文, 陈晃, 付萌. 风洞天平校准台并联复位机构精度分析[J]. 清华大学学报(自然科学版), 2018, 58(3): 298-304.
GUAN Liwen, CHEN Huang, FU Meng. Accuracy of the parallel reset mechanism in a wind tunnel balance calibration system. Journal of Tsinghua University(Science and Technology), 2018, 58(3): 298-304.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2018.25.011  或          http://jst.tsinghuajournals.com/CN/Y2018/V58/I3/298
  图1 风洞天平校准台
  图2 风洞天平校准台复位机构
  图3 支链坐标系示意图
  表1 第j 条支链DGH 参数
  图4 复位机构坐标关系示意图
  图5 偏移误差对位置误差的影响
  图6 偏移误差对姿态误差的影响
  图7 XOZ 截面上铰链误差影响系数
  图8 平台半径对误差的影响
  图9 铰链夹角对误差的影响
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