基于虚拟时间反演技术的木板损伤定位OA

Aiming at the problem of requiring two excitation signals in traditional time-reversal algorithms,a method is proposed to simplify experimental procedures while improving the accuracy of damage localization in wooden boards.A single-input single-receive virtual time reversal(VTR)technique is developed,which replaces the physical time-rever-sal process with signal operations.The correlation coefficient between the reconstructed signal obtained via virtual time reversal and the excitation signal is defined as a damage index(Ds).Combined with ultrasonic probabilistic imaging,this method enables precise localization of damage in wooden boards.Numerical simulations and experiments demon-strate that signals can achieve virtual focusing at the damage locations,significantly enhancing localization accuracy.The VTR technique not only streamlines the experimental process but also effectively improves damage localization,pro-viding a practical reference for engineering applications.