Optimization of Simulation Channels for Inverse FRF Calculation on 6-Axis Road Load Simulator: An Experimental Approach

Nowadays, Road Load Simulators are used by automobile companies to reproduce the accurate and multi axial stresses in test parts to simulate the real loading conditions. The road conditions are simulated in lab by measuring the customer usage data by sensors like Wheel Force transducers, accelerometers, displacement sensors and strain gauges on the vehicle body and suspension parts. The acquired data is simulated in lab condition by generating ‘drive file’ using the response of the above mentioned sensors [2]. For generation of proper drive file, not only good FRF but ensuring stability of inverse FRF is also essential. Stability of the inverse FRF depends upon the simulation channels used.

In this paper experimental approach has been applied for the optimization of the simulation channels to be used for simulation of normal Indian passenger car on 4 corners, 6-Axis Road Load Simulator. Time domain tests were performed to identify potential simulation channels. FRF of the different channels has also been studied for channel selection. Finally different combination of simulation channels is applied for checking the stability of FRF matrix by control band calculation. The final result was verified by white noise iteration in the range of 0 ~ 50 Hz frequency.