Acceleration signal simulation induced by single obstacle crossings by means of nonlinear, block-oriented models for an automotive comfort simulator

Abstract

This paper presents a method for replicating transient signals induced in a passenger car by single-obstacle crossings. These replicated signals should be used in a ride comfort simulator. By using feedforward-inverse-model-control with direct identification of the inverse transfer function, time-consuming iterations of conventional time waveform replication methods are eliminated. The quality of the system identification for approximating the inverse transfer function is significantly increased by decomposing the frequency band and the complexity is considerably reduced. The use of nonlinear block-oriented models significantly decreases the replication errors in frequency bands with high nonlinearity influence.

A MIMO system for the replication of accelerations excited in a vehicle by single obstacle crossings at comfort-relevant excitation points in a comfort simulator

“…The procedure for replicating the acceleration signals is visualized in Fig. 1 and is described in [17]. The real crossings of single obstacles (Fig.…”

“…negative edge) in the real vehicle b) Shaker excitation ▲ of the body in white (with seat) in the simulator with a suitable test signal 𝑢 and recording of the system response 𝑦 at the reference positions c) Offline approximation of the inverse transfer function d) Excitation of the corresponding shaker with the determined drive signal Fig. Scheme for replicating single obstacle crossings on a simulator[17]…”