DFD Stratagem Investigation on Suspension Subframe Durability Test with Spindle Coupled Road Test Simulator 2020-01-0992
In order to replicate the vehicle chassis proving ground (PG) durability test on the laboratory half vehicle spindle coupled Road Test Simulator (RTS), a drive file which can excite the actuators of the RTS to duplicate the chassis component stress state need to be developed. Traditionally the Drive File Development (DFD) aims to match the spindle forces and moments in addition with some supplement channels such as the tierod axial forces and the spring travels. However the suspension subframe which was connected to the vehicle body may particularly experience a different stress state on the RTS due to the boundary condition discrepancy between the vehicle PG test and the laboratory RTS test. In this paper, the investigation of the different boundary conditions impact on the chassis structures’ stress state is conducted both physically and virtually. It’s proved that the subframe stress state has a non-negligible difference from full vehicle PG test to the half vehicle spindle coupled RTS test using the conventional DFD stratagem. Thus, a special DFD stratagem which employees the subframe strain road load data is then established and validated on the 2 corner MTS 329 Test system – a 6-DOF RTS with a front suspension subsystem. The results shows that the suspension subframe stress state can be well retained on the RTS compared to the PG test by using this special DFD stratagem. In other words, the durability validation of the suspension subframe can be implemented much more accurately on the laboratory RTS system with this special DFD stratagem.
Jianghua Gao, Matt Guo, Xin Zhang, Xiao Yu