变节距悬架弹簧对方程式赛车平顺性的影响

针对大学生方程式赛车座椅与车架为刚性连接，行驶过程中车架振动对驾驶员造成很大影响的问题，分析了赛车变节距悬架弹簧的弹性特性曲线拟合方法，得出了变节距悬架弹簧节距随载荷的变化规律；通过随机输入实验和确定输入实验，对比分析了赛车前悬架分别采用线性弹簧和变节距弹簧对平顺性的影响。实验结果表明：随着车速的提高，车身各测点的最大垂直振动加速度都增大，但采用变节距弹簧的各测点值都小于采用线性弹簧的各测点值；当实验车速为50km/h时，采用变节距弹簧，前轴测点和座椅底板测点的垂直振动加速度均方根值较采用线性弹簧分别减小了11.02％和20.16％，平顺性得到提高。

Effects of Variable Pitch Spring on Ride Comfort of Formula Student Racings

As the seats of formula student racings were rigid connected with frame, the vibration load might has great influences on the drivers. A characteristic curve fitting method of variable pitch spring was analyzed herein, and the variation laws of pitch with loads were obtained. Then, the effects of variable pitch spring on the ride comfort were analyzed, which were compared with linear spring, through random input experiments and determine input experiments. Experiments show that:(1) with the increase of speed, the maximum vertical vibration acceleration of each measuring points increases, while using variable pitch spring they are less than that using linear spring,(2) when the vehicle speed is as 50 km/h, the vertical vibration acceleration of the RMS value of the front axle measuring points and floor near the seat measuring points using variable pitch spring are reduced by 11.02% and 20.06% respectively and ride comfort and damping property are improved visibly comparing with using linear spring.