303 / 2021-04-23 16:28:36

Analysis and Optimization of Dynamic Stiffness for Seat Installation Points in Commercial Vehicle

Topology optimization, Seat comfort, Commercial vehicle, Surrogate model;

Abstract: The seat comfort is one of the important indicators of vehicle comfort, especially for commercial vehicle  due to the requirement of reducing the driver’s fatigue in long distance driving.  In this paper, the structural optimization of seat installation point in commercial vehicles is completed in order to improve seat comfort for drivers. The finite element of the cab with seat is established and developed. The accuracy of the finite element model is verified by comparing the calculated modes with the experimental modes. The surrogate model based on response surface method is developed to reduce the computer cost of the finite element model. The frequency response function of acceleration（IPI）curve for  four seat installation points is calculated. The frequency response analysis shows that the local and weak stiffness appears in cab floor which results in the peak of IPI curve and deteriorates the seat comfort. The structural topology optimization is proposed in order to increase dynamic stiffness and enhance support for seat installation points. Several optimization design schemes are suggested. The optimization results show that the optimized equivalent dynamic stiffness of the seat installation points can increase 130% compared to the original equivalent dynamic stiffness. This implies a seat comfort in commercial vehicle can be achieved substantially.