摘要
机匣连接的螺栓预紧力大小对其动力学特性影响较大。为更准确反映其接触刚度随预紧力的变化情况,采用分区域薄层单元方法代替螺栓连接部分,并基于螺栓连接超模型刚度理论、赫兹接触理论以及M-B分形模型,推导出不同螺栓预紧力下分区域薄层单元的弹性模量,模拟机匣连接部分的轴向接触刚度,给出螺栓连接机匣简化建模方法。并以1个螺栓连接试验机匣为例,对比在不同螺栓预紧力下机匣仿真频率与模态试验频率,最大误差仅为2.83%。结果表明:分区域薄层单元建模方法能够有效地对不同预紧力下的螺栓连接机匣进行简化建模。
The pre-tightening force of the casing bolted joints had a great influence on the dynamic characteristics of the bolt. In order to reflect more accurately the change of contact stiffness with pre-tightening force,a thin-layer element method was used to replace the bolted joints structure. Based on the stiffness theory of bolted joints supermodel,Hertz contact theory and M-B fractal model,the elastic modulus of thin-layer element with different bolted pre-tightening force was derived. The axial contact stiffness of the casing joints part was simulated,and the simplified modeling method of the bolted joints casing was given. Taking a bolted joints test casing as an example,the maximum error was only 2.83%,compared with the simulation frequency and modal test frequency of the casing under different bolted pretightening force. The results show that the modeling method of the thin-layer element can effectively simplify the modeling of bolted joints casing under different pre-tightening forces.
作者
王攀
臧朝平
WANG Pan;ZANG Chao-ping(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空发动机》
北大核心
2019年第2期7-12,共6页
Aeroengine
