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清华大学学报(自然科学版)  2019, Vol. 59 Issue (9): 772-779    DOI: 10.16511/j.cnki.qhdxxb.2019.26.014
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
预紧力与非线性作用的螺栓结合部动力学特性
赵彤1, 郭俊杰1, 吕玉红2
1. 清华大学 机械工程系, 北京 100084;
2. 中国航发沈阳发动机研究所, 沈阳 110015
Nonlinear dynamic characteristics of bolted joints for various pretension forces
ZHAO Tong1, GUO Junjie1, LÜ Yuhong2
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. AECC Shenyang Engine Research Institute, Shenyang 110015, China
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摘要 为研究预紧力对螺栓结合部动力学特性的影响,该文选择一种双螺栓结合部试件作为研究对象,通过理论推导利用集中参数法在试件一阶模态处建立了单自由度简化模型;通过模态实验获得了不同螺栓预紧力下结构一阶动力学特性的变化情况;在激振实验的基础上,利用力状态映射法对结合部在不同预紧力下非线性等效动力学参数进行了辨识。结果表明:结合部非线性会随预紧力降低而增强。在预紧力较低时,对结合部进行准确动力学建模需要考虑非线性因素的影响。
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关键词 螺栓结合部预紧力动力学特性参数辨识    
Abstract:The influence of the bolt pretension force on the dynamic characteristics of bolted joints was studied using a double bolt joint with an equivalent single DOF model based on the lumped parameter method near the first mode. Then, the equivalent dynamic parameters were obtained for various bolt preloadings using modal and excitation tests. The equivalent nonlinear dynamic parameters for the joint were then identified using the force-state mapping method for various pretension forces. The results show that the joint nonlinearity increases with decreasing pretension force. Therefore, the nonlinear joint dynamics must be considered for low pretension forces.
Key wordsbolted joints    pretension force    dynamic characteristics    parameter identification
收稿日期: 2018-12-25      出版日期: 2019-08-27
基金资助:“高档数控机床与基础制造装备”科技重大专项(2017ZX04010001-009);总装预研项目(JZX6Y201901010031)
引用本文:   
赵彤, 郭俊杰, 吕玉红. 预紧力与非线性作用的螺栓结合部动力学特性[J]. 清华大学学报(自然科学版), 2019, 59(9): 772-779.
ZHAO Tong, GUO Junjie, LÜ Yuhong. Nonlinear dynamic characteristics of bolted joints for various pretension forces. Journal of Tsinghua University(Science and Technology), 2019, 59(9): 772-779.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.26.014  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I9/772
  图1 双螺栓结合部试件
  表1 试件模态有限元分析结果
  图2 简化的单自由度振动系统
  图3 模态测试系统
  图4 测试模态振型
  图5 (网络版彩图)一阶模态附近锤击 频响函数随预紧力变化
  表2 模态测试实验结果
  图6 (网络版彩图)模态参数随预紧力变化
  图7 激振测试系统
  图8 (网络版彩图)不同激励下得到的 频响函数对比
  图9 加速度响应幅值随力幅变化
  表3 力状态映射法参数辨识结果
  表4 模态测试和激励测试参数辨识结果对比
  图10 (网络版彩图)仿真结果与实验结果对比
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