Virtual Verification of Wrecker Tow Requirements 2020-01-0766
Under various real world scenarios, vehicles can become disabled and require towing. OEM’s allow a few options for vehicle wrecker towing that include wheel lift tow using a stinger or towing on a flatbed. These methods entail multiple loading events that need to be assessed for damage to the towed vehicle. OEMS have several testing and evaluation methodologies in place for those scenarios with majority requiring physical vehicle prototypes. Recent focus to reduce product development time and cost has replaced the need for prototype testing with analytical verification methods. In this paper, the CAE method involving multibody dynamic simulation (MBS) as well as finite element analysis (FEA) of vehicle flatbed operation, winching onto a flatbed and stinger-pull towing methods are discussed. The simulations evaluate and address events such as bumper and underbody parts impact with the ground, subframe impact with the stinger arm, chain loading on the body, as well as winch cable contact with underbody parts. MBS-FEA co-simulations appear to be computationally expensive and, more importantly, target only a specific vehicle configuration and loading scenario. Hence, a system engineering approach was chosen in order to decouple the MBS and FEA efforts. This enables the CAE method to be more general and allows for system-independent design of various components and parts independently by suppliers. Several simulation results for vehicle winching, flatbed operation, and stinger pull, using MSC Adams and Abaqus, are presented to demonstrate the effectiveness of the approach.
Majid Tabesh, Steven Foster, Sethuprasant Boomipaulraj, Arthur Gariepy, Jim Alanoly