Front Suspension Joint Integrity Analysis for Addressing Noise Issue Due to Torque Loss at Lower Control Arm Joint
The lower control arm (LCA) is a part of the front suspension system which is mounted on chassis with flexible rubber bushing through-bolted joint which allows the control arm to swing up and down, absorb road bumps and reduce noise and vibrations as front wheels roll over bump or potholes. In bolted joints, torque is applied so as the joint develops a certain preload that is higher than the external loads and losses acting on the joint. But the loss of preload is evident over time which causes quality problems, reworks, or even joint failures. While moving over speed breakers/obstacles abnormal squeak noise is observed in the vehicle due to torque loss in the LCA joint. The intent of this study is to determine preload requirements in LCA joint and various factors contributing to preload loss by performing joint integrity analysis in CAE. Road load data acquisition (RLDA) with Wheel Force Transducer (WFT) is performed for different testing tracks.