Numerical Methods for Combined Analysis of Seat And Ride-Comfort 2019-01-0404
Seating comfort and ride comfort for a passenger during a test drive on an automobile seat is a vital factor influencing the decision to buy. Although test studies of manufactured vehicles are performed on specified road-profiles, the amount of subjectivity involved in the evaluation of the dynamic ride-comfort reduces the reliability of such studies to serve as a basis for design. Numerical simulations represent a cost-effective, yet a highly reliable method to evaluate the seating and the ride comfort, in addition to having the advantage of repeatability. In this paper, a numerical approach to analyze the vibrations on the human body arising from real excitations of the whole vehicle is presented. This represents an interface between the seating comfort, where the occupant and the seat are considered separately in isolation from the rest of the vehicle, and the ride comfort, where the occupant is subjected to real vibrations arising from the rest of the vehicle. Here, a standard Finite Element (FE) model of the human body, CASIMIR m50 on an automobile seat typically used for static and dynamic seating comfort in Abaqus, is converted into a substructure and used to evaluate the ride comfort in SIMPACK, via the Multi-Body Systems (MBS) approach. The validation of the conversion is performed via reproduction of the eigenmodes. While the eigenmodes could be reproduced accurately, there are some deviations in the seat transmissibility, based on excitations from a real test drive.
Alexander Siefert, Jörg Hofmann, A. Veeraraghavan, Y. Lu
Virtual Human GmbH, Wölfel Engineering GmbH + Co. KG