A Study on Estimation of Coefficient Using Wavelet Transform and Its Application to the Evaluation of Harshness in Passenger Car

웨이브렛 해석을 이용한 승용차의 충격 하쉬니스 개선

Estimation of damping ratio for vibration signals measured on the passenger car's seat is useful for the objective evaluation of impact harshness in car. The vibration signal is a transient signal represented by many coupled modes of suspension system. Wavelet transform automatically decouples these modes in the time-frequency domain. Damping ratios for decoupled modes are obtained by logarithmic treatment for the Wavelet transformed signal. The objective evaluation using Wavelet transform has been well corresponded with subjective evaluation done by skilled engineers.