The Optimization Design and Dynamic Stiffness Analysis on Front Sub-frame of Passenger Car

摘要

This paper focuses on realizing 30%-50% weight reduction of the front sub-frame in a fuel cell vehicle, meanwhile according to the strength analysis results of front sub-frame made of steel and Mg alloy separately, the front sub-frame's structure optimization design is carried on. Through increasing the component thickness and adding strengthening ribs and stiffening beams, dynamic stiffness features of the frame could be modified and verified. The new front sub-frame is presented, which with the same operational performance as steel front sub-frame and at the same time the weight reduction by 46% is achieved. This research provides a valuable reference for modern development of the automotive industry on both the design method and evaluation technology.