Real-Time Detection Of Wheel Hub Based On Laser Ultrasound

As one of the important components of the car,the wheel hub works in a high-speed and relatively harsh environment.Whether the wheel hub is damaged is related to the driving experience of the vehicle and the life safety of the driver,therefore,in order to ensure the driving experience of the vehicle and the safety of the driver’s life,real-time non-destructive monitoring of the wheel hub is required.The advantages of laser ultrasonic testing system are non-contact,long-distance detection,frequency bandwidth,etc.,which are widely used in non-destructive testing.This paper proposes a new method for non-destructive testing of wheel hubs.Based on laser ultrasonic testing system,real-time non-destructive monitoring of wheel hubs is carried out.By collecting ultrasonic echo data,timely and accurate detection of defects can avoid various accidents happended.In order to study the ultrasonic propagation inside the wheel hub structure,the COMSOL software was used to establish a numerical calculation model of the ultrasonic scattering on the surface of the wheel hub.According to the ultrasonic scattering in the model,a wavelet analysis noise reduction method was selected.Based on the ultrasonic energy attenuation theory,the car was extracted.The characteristics of the wheel hub defect length,and using MATLAB to fit the proportional relationship between the wheel hub defect length and the functional relationship between the wheel hub defect length and the ultrasonic echo.Finally,the research content of this subject is summarized,and the development prospect of the laser ultrasonic testing system in the non-destructive testing of the wheel hub is also prospected.In this paper,the main research contents of real-time monitoring of wheel hubs based on laser ultrasound include the following:(1)A new method for non-destructive testing of wheel hubs is proposed.The laser ultrasonic testing system is used for real-time non-destructive monitoring of the wheel hubs,which not only avoids the measurement errors caused by the coupling agent for direct contact detection,but also the current status of research on wheel hub non-destructive testing.On the basis,it solves the technical defect that other non-contact detection methods can only detect wheel hub surface damage,and achieves the purpose of detecting wheel hub damage from the inside and outside.(2)It is a numerical calculation model to establish the ultrasonic scattering of wheel hub surface defects.In order to study the propagation and scattering of ultrasonic waves inside the wheel hub structure,the COMSOL software is used to establish the numerical calculation model of the defects.Aiming at the propagation path and ultrasonic scattering of different types of defects.According to the result,the processing method of wavelet analysis is selected to perform noise reduction processing on the laser ultrasonic echo signal.(3)In terms of the processing of experimental data,based on the theory of ultrasonic energy attenuation,fit a function of the proportional coefficient and the length of the wheel hub defect.Then use the function to solve the defect length and compare it with the actual defect length to verify the feasibility of this scheme.The results show that the energy attenuation theory has certain practicability for extracting the defect length value from the laser ultrasonic echo signal.