Through the modal analysis of the leaf spring and the compilation of neutral files,a semi-active push rod suspension with a lower transverse variable stiffness leaf spring is designed.The vertical stiffness of the leaf spring at a different point of the ve-hicle body is:-2907.3N/mm,2107.2N/mm,708.7N/mm,708.7N/mm.Analysis of the force transmission model of the suspension shows that the vehicle body roll angular acceleration is inversely proportional to the square of the distance between the leaf spring and the vehicle body installation position to the spring center.It proposes a double fuzzy control algorithm.The calculation of 40km/h around the pile shows that the stability performance indexes of pitch acceleration,roll acceleration,and yaw accelera-tion in the chassis high rigidity mode are increased by 89.4％,53.2％,and 18.2％respectively.Aiming at the instability of the 50km/h FSAE racing car,an optimization scheme for the lower double transverse blade spring suspension was proposed,and the final stability performance indicators were increased by 82.3％,85.2％,and 41.1％respectively.
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