Preload testing of high strength bolt of fans based on ultrasonic longitudinal wave
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摘要: 采用COMSOL多物理场分析软件模拟了螺栓预紧力检测中纵波的传播过程，总结了应力对纵波传播时间的影响规律，在理论及模拟分析的基础上对风电变桨轴承螺栓进行了标定预紧力检测试验。结果表明，纵波激励信号离开螺栓端部时无反射干扰现象，波阵面传播至结构突变处时发生波型转换，产生边缘横波，同时在螺栓侧壁处形成边缘纵波。模拟及标定试验确定了预紧力与声时差的线性关系，利用最小二乘法对检测数据进行了拟合，基于拟合的预紧力与时间对应关系对螺栓预紧力进行了检测，检测数值与拉力机数值总体误差为2.78％。Abstract: In this paper, COMSOL multiphysics analysis software was used to simulate the propagation process of longitudinal waves in the bolt pretightening force detection, and the influence law of stress on the propagation time of longitudinal waves was summarized. Based on theoretical and simulated analysis, the preload test of high strength bearing bolt was carried out. The results showed that when the longitudinal wave excitation signal left the end of the bolt, there was no reflection interference phenomenon. When the wave front propagated to the sudden change of the structure, the wave mode conversion occurred, and the edge shear wave was generated, and the edge longitudinal wave was formed at the bolt side wall. The linear relationship between the pre-tightening force and the acoustic time difference was determined by the simulation and calibration test, and the test data was fitted by the least square method. The overall error is 2. 78% as compared with the tensile machine value.
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Keywords:
- COMSOL /
- bolt /
- preload testing /
- longitudinal wave
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