典型螺栓连接界面轴向动态特性的不确定性研究

陈学前1,2,沈展鹏1,2,刘信恩1,2,范宣华1,2,胡杰1,2

振动与冲击 ›› 2021, Vol. 40 ›› Issue (10) : 20-24.

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (10) : 20-24.
论文

典型螺栓连接界面轴向动态特性的不确定性研究

  • 陈学前1,2,沈展鹏1,2,刘信恩1,2,范宣华1,2,胡杰1,2
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Uncertainty analysis on the normal dynamic characteristics of bolted joint interfaces

  • CHEN Xueqian1,2,SHEN Zhanpeng1,2,LIU Xin’en1,2,FAN Xuanhua1,2,HU Jie1,2
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摘要

工程结构中普遍存在螺栓连接,其中螺栓连接界面的非线性与不确定性是其两个重要特性,该研究针对某典型螺栓连接界面轴向动态特性的不确定性开展研究。通过结构不同次装配工况的正弦振动试验,获得了系统轴向振动固有频率与模态阻尼比的不确定性。采用薄层单元建立螺栓连接结合面模型,基于薄层单元弹性模量、泊松比与连接系统固有频率的关系,以及薄层单元材料损耗因子与模态阻尼比的关系,再结合基于主成分分析(PCA)的不确定性有限元模型修正方法,利用螺栓连接系统的不确定性研究试验结果,对薄层单元的弹性模量、泊松比及材料损耗因子区间进行了识别。识别得到的螺栓连接轴向固有频率与模态阻尼比区间与试验结果区间吻合较好,研究结果为类似螺栓连接结构结合面动力学建模及其不确定性研究提供了新方法。

Abstract

Bolted joints are applied in engineering structures widely.Nonlinearity and uncertainty are two important features of bolted joint interfaces.The uncertainty of the normal dynamic characteristics of bolted joint interfaces was studied in the paper.The uncertainty of the natural frequencies and modal damping ratios of the structure under different assembly conditions was obtained by sine-sweep vibration experiments, and the joint interfaces were simulated by a finite element model with thin layer elements.The intervals of the elastic modulus, Poisson’s ratio and loss factor of the thin layer element were identified by combined use of the principal component analysis (PCA) and the uncertainty experimental results of the bolted joint system.The identified intervals of the natural frequency and modal damping ratio are in good agreement with those by experiments, which provides a new way to the dynamic modeling of joint interfaces and the uncertainty study on similar bolted joint structures.

关键词

螺栓连接 / 连接结合面 / 法向 / 动态特性 / 不确定性

Key words

bolted joint / joint interface / normal direction / dynamic characteristic / uncertainty

引用本文

导出引用
陈学前1,2,沈展鹏1,2,刘信恩1,2,范宣华1,2,胡杰1,2. 典型螺栓连接界面轴向动态特性的不确定性研究[J]. 振动与冲击, 2021, 40(10): 20-24
CHEN Xueqian1,2,SHEN Zhanpeng1,2,LIU Xin’en1,2,FAN Xuanhua1,2,HU Jie1,2. Uncertainty analysis on the normal dynamic characteristics of bolted joint interfaces[J]. Journal of Vibration and Shock, 2021, 40(10): 20-24

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