Acoustic and Vibration Model Identification of Multi Input Multi Output Structure Based on Principle Component Analysis in Frequency Domain

— Estimation of Road Noise in Car Cabin —

Abstract

Reduction of noise in a car cabin due to road irregularities has been a subject of research for many years. For reducing such a noise, we proposed H₂-based active structural acoustic control method that used road noise estimation models and we verified its feasibility on a test bench. In this paper, we propose road noise estimation method in driving condition. The structure of road noise estimation, the method to select accelerometer number and location, and system identification method are proposed. In order to avoid multicollinearity among acceleration signals, principal component analysis over frequency domain is used for non-parametric modelling. The estimation performance and robustness was verified by using driving experimental data.