DISCUSSION ON THE ROADWAY ROUGHNESS PROFILE IDENTIFICATION METHODS UTILIZING ACCELERATION MEASURED ON A MOVING VEHICLE

Abstract

This study is intended to disucuss and compare accuracy of road profile identification methods utilizing measured accelerations on a moving vehicle. The accuracy of road profile identification is discussed focusing on ways of deriving a state-space equation and the parameters to be identified by the inverse problem. Vehicle accelerations obtained both from simulation and field experiment are utilized to the roadway rough-ness profile identification. The identified results are evaluated by an error function and root mean square error (RMSE) of power spectral denstiy (PSD) of identified roadway roughness profiles. It was confirmed that the method which identifies the roadway roughness profile directly by the least square minimization has higher accuracy than that identified by means of the moving force identificxation (MFI) method. In selection of the optimal regularization parameter, the point of shortest distance from the origin of the L-curve provided the optimal one for the direct roadway roughness profile identification method.