结合面非线性特性对法兰螺栓连接动态性能的影响

推进技术 ›› 2018, Vol. 39 ›› Issue (9): 2068-2074.

结合面非线性特性对法兰螺栓连接动态性能的影响

艾延廷,杨策,田晶,王志

沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136,沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136,沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136,沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136

发布日期:2021-08-15
作者简介:艾延廷，男，博士，教授，研究领域为航空发动机结构完整性与可靠性，航空发动机故障诊断等方向。E-mail: ytai@163.com 通讯作者:田晶，男，博士生，工程师，研究领域为航空发动机强度、振动及可靠性方向。
基金资助:
国家自然科学基金(51505300)。

Effects of Non-Linear Characteristics of Joint Surface on Dynamic Performance of Flange Bolt Connection

Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China,Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China,Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China and Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China

Published:2021-08-15

摘要/Abstract

摘要： 为研究结合面非线性特性对法兰螺栓连接结构动态性能的影响，基于有限元分析与试验相结合的方法，首先，针对“L”型连接梁建立了完全bonded(绑定)、螺栓位置bonded和全摩擦三种模型并进行模态分析和动力学响应分析，研究发现后两种模型的结果比较接近且具有阻尼非线性特征。然后，建立了较复杂的薄壁机匣模型，研究了摩擦非线性和预紧力对其结构响应的影响，发现摩擦非线性因素对激励方向响应的影响较小，但对非激励方向响应的影响较大；加大预紧力可使完全bonded模型和全摩擦模型之间的误差减少到10%左右。最后，采用预应力模态法研究了结合面摩擦系数对薄壁机匣动力学特性的影响，结果表明摩擦系数对结构固有频率影响显著。模态试验结果与预应力模态计算结果误差在5.1%以内，验证了预应力模态法处理结合面非线性因素的有效性。

关键词: 结合面；非线性特性；动力学分析；预应力模态

Abstract: To study the influences of the nonlinear characteristics in the joint surface for dynamic performance of bolted flange connections， a method based on the combination of finite element analysis and experiment was proposed. Three models of complete bonded， bolt position bonded and complete friction were established for the L type connection beam， and modal analysis and dynamic response analysis were carried out. It was found that the responses of the latter two models are consistent and have damping nonlinear characteristics. Then， a more complex thin-walled casing model was established. The effects of the friction nonlinearity and the preload on the structural response were studied. It was found that the friction nonlinearity has little effect on the excitation direction， but the effect on the non-excitation direction was greater. Increasing the preload can reduce the error between the complete bonded model and the complete friction model to about 10%. Finally， influences of the friction coefficient of the joint surface on the dynamic characteristics of the thin-walled casing were studied by the pre-stressed modal method. The results show that the friction coefficient has a significant effect on the natural frequency of the structure. The error of the modal test results and the pre-stressed modal is less than 5.1%， which verifies the effectiveness of the pre-stressed modal method in dealing with the non-linear factors.

Key words: Joint surface；Nonlinear characteristics；Dynamics analysis；Pre-stressed modal

艾延廷,杨策,田晶,王志. 结合面非线性特性对法兰螺栓连接动态性能的影响[J]. 推进技术, 2018, 39(9): 2068-2074.

AI Yan-ting,YANG Ce,TIAN Jing,WANG Zhi. Effects of Non-Linear Characteristics of Joint Surface on Dynamic Performance of Flange Bolt Connection[J]. Journal of Propulsion Technology, 2018, 39(9): 2068-2074.

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