Lateral random vibration of boring bar for BTA deep-hole process

被引：0
|
作者：
Zhao W. [1 ]
Zhang Q. [1 ]
Li Y. [1 ,2 ]
Jing S. [1 ]
机构：
[1] School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo
[2] College of Mechanical and Electrical Engineering, Xinxiang University, Xinxiang
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 03期
关键词：
BTA deep-hole boring bar; characteristic value; lateral vibration; response variance; spectral density; stochastic vibration characteristics;
D O I：
10.13465/j.cnki.jvs.2024.03.006
中图分类号：
学科分类号：
摘要：
Here, the random method was used to analyze lateral random dynamic behavior of a BTA deep hole boring bar containing axially flowing fluid under random force. In modeling process, bending, tensile and torsion deformations of fluid-solid interaction boring bar were investigated. After discretization processing using Galerkin method, effects of eigenvalues and characteristic frequencies of BTA boring bar on its vibration characteristics were analyzed with and without random excitation. Critical rotating speed and critical instability frequency of lateral vibration of BTA boring bar were solved analytically using the maximum response variance and spectral density. The influence mechanism of boring bar on vibration characteristics of the system with changes of parameters of rotating speed, stiffness, initial axial total force and shear modulus was clarified. It was shown that variation of boring bar rotating speed no longer has monotonicity on the system stability, with increase in BTA boring bar rotating speed, the system rotating speed can undergo two critical instabilities, i. e., 2 instabilities and 2 stabilities occur crosswise one after another; increase in system equivalent stiffness and equivalent shear modulus can promote the stability of working process, while changing axial force has no obvious impact on the stability of working process ; the consistency between theoretical simulation results and test results was verified through power spectral analysis of random vibration experimental signals; this study to some extent reveals the complexity of motion state of BTA deep hole process system to provide more possibilities for further analyzing motion evolution under complex states; the study conclusions can provide a basis for a better understanding of random dynamic behavior of BTA deep hole boring bar during operation, and also lay a theoretical foundation for vibration control and parametric optimization of BTA deep hole process. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：46 / 57
页数：11
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