基于洛伦兹力的汽车转向节缺陷检测方法研究

RESEARCH ON DEFECT DETECTION METHOD OF AUTOMOBILE STEERING KNUCKLE BASED ON LORENTZ FORCE

转向节作为连接汽车转向系统和悬架系统的关键部件,其性能直接影响交通事故的发生率.本文针对汽车转向节缺陷检测方法与技术存在的缺点和不足,提出一种基于洛伦兹力的汽车转向节缺陷检测新方法.新方法通过控制电磁信号耦合在转向节内产生洛仑兹力,洛仑兹力使转向节内部固体粒子振动激发超声信号,通过采集超声信号重建图像以检测转向节缺陷分布.本文研究了洛伦兹力检测的基本原理,通过控制电场和磁场信号激励产生洛仑兹力的过程,进一步就检测方法中的平面模型进行了理论分析和仿真计算.计算结果表明,以洛仑兹力为声源的耦合检测方法中,转向节中的电流密度分布、洛伦兹力分布和洛伦兹力散度分布均能够体现转向节的电导率分布.本文的研究工作为新方法的应用提供研究基础,有利于推动汽车安全检测行业的新检测技术理论的发展,新检测技术方法的应用.

The steering knuckle is a key component to connect automobile steering system and suspension system,and the performance of steering knuckles affects the incidence rate of road traffic accidents directly.In this paper,in view of the shortcomings and deficiencies of the defect detection methods and technologies of automobile steering knuckle,a new defect detection method of automobile steering knuckle based on Lorentz force is proposed.The new method generates Lorentz force in steering knuckle by controlling electromagnetic signal coupling.Explicitly,Lorentz force excites ultrasonic signals by vibrating solid particles in the steering knuckle,and then the ultrasonic signals are reconstructed to detect the defect distribution in the steering knuckle.In this paper,the basic principle of Lorentz force detection and the process of generating Lorentz force by controlling electric and magnetic signals are studied,and the plane model of the detection method is analyzed and simulated.The results show that the current density distribution,Lorentz force distribution and Lorentz force dispersion distribution in the steering knuckle can reflect the conductivity distribution of the steering knuckle in the coupled imaging detection method with Lorentz force being the sound source.The research work provides a foundation for application of the new method,which is beneficial to development of new detection technologies and applications of new detection methods in the automotive safety inspection industry.