• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (17): 218-225.doi: 10.3901/JME.2018.17.218

• 机械动力学 • 上一篇    下一篇

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螺栓结合部接触区域非线性动态特征的凝聚建模方法

江和龄, 孔令飞, 李超, 崔博   

  1. 西安理工大学陕西省机械制造装备重点实验室 西安 710048
  • 收稿日期:2017-10-13 修回日期:2018-05-22 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 孔令飞(通信作者),男,1977年出生,博士,教授,博士研究生导师。主要研究方向为高速精密机电耦合系统的设计与控制。E-mail:lingfeikong@xaut.edu.cn
  • 作者简介:江和龄,男,1992年出生。主要研究方向为螺栓结合部动态特征建模方法。E-mail:heling_j@163.com
  • 基金资助:
    国家自然科学基金(51475367)、国家科技重大专项(2014ZX04001-191)、陕西省教育厅重点实验室(17JS093)和陕西省自然科学基础研究计划(2018JM5113)资助项目。

Condensation Modeling of Nonlinear Dynamics in Contact Region of Bolted Joint

JIANG Heling, KONG Lingfei, LI Chao, CUI Bo   

  1. Key Laboratory of Shaanxi Mechanical Equipment, Xi'an University of Technology, Xi'an 710048
  • Received:2017-10-13 Revised:2018-05-22 Online:2018-09-05 Published:2018-09-05

摘要: 为研究非线性接触力的影响,提出一种新型螺栓结合部接触区域动态特征的建模方法。基于混合坐标模态缩减技术,将螺栓联接模型中线性自由度的特征模态进行截断,仅保留接触区域的非线性动态特征模态。通过引入可等效表征非线性特征的接触耦合凝聚点,利用坐标变换将接触区域耦合面的非线性接触力凝聚到该作用点上,使得对螺栓结合部的非线性界面接触力转化为凝聚作用点的非线性刚度,从而在保证计算精度的前提下有效降低非线性耦合结合部求解的自由度数,节约计算资源。通过理论计算与试验对比,验证结合部耦合凝聚建模方法的有效性与可行性,这将为精准、高效地预测结构联接体的动态特征与性能评价奠定基础。

关键词: 接触区域, 螺栓结合部, 模态缩减, 凝聚模型

Abstract: In order to study the influence of nonlinear contact force, a new method for modeling the dynamic characteristics of the contact region of bolted joint is proposed. Based on hybrid coordinate modal reduction technique, the characteristic modes of the linear degree of freedom in the bolt connection model are truncated, and only the nonlinear dynamic characteristics of the contact region are retained. After introducing the contact coupling condensation point which can equivalently take the place of nonlinear characteristic, the nonlinear contact force of the contact area can be condensed to the point by using the coordinate transformation. The nonlinear force of the bolt contact area will be transformed into the nonlinear stiffness of the condensation point. Therefore, it can effectively reduce the number of degrees of the nonlinear coupling and the computing resources. Through theoretical calculation and experimental comparison, the effectiveness and feasibility of the proposed method is verified. This will lay the foundation for the accurate and efficient prediction of dynamic characteristics and performance evaluation of structural joints.

Key words: bolted joint, condensation model, contact region, modal reduction technique

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