预紧力与非线性作用的螺栓结合部动力学特性

赵彤, 郭俊杰, 吕玉红

清华大学学报（自然科学版） ›› 2019, Vol. 59 ›› Issue (9) : 772-779.

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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

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
作者信息 +

Nonlinear dynamic characteristics of bolted joints for various pretension forces

  • ZHAO Tong1, GUO Junjie1, LÜ Yuhong2
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文章历史 +

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。

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.

关键词

螺栓结合部 / 预紧力 / 动力学特性 / 参数辨识

Key words

bolted joints / pretension force / dynamic characteristics / parameter identification

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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 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.014
ZHAO Tong, GUO Junjie, LÜ Yuhong. Nonlinear dynamic characteristics of bolted joints for various pretension forces[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(9): 772-779 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.014

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基金

“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）

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