分析了汽车制动试验台对车轮的测力能力的动态变化过程,指出被测轮与滚筒界面的附着系数随着轮胎上爬而减小,非测轮在地面上的附着系数随着车身位移而增大,轮胎上爬时安置角减小,正压力增加,但测得的制动力却下降。理论分析与试验结果相吻合。 The dynamical changing process of the test force of the wheel on the brake test bed is analyzed. It is pointed out that the adhesion coefficient of the test wheel and the roller interface decreases with the climb of the tire. The adhesion coefficient of the non-test wheel on the ground varies with the body displacement However, when the tire climbs, the settling angle decreases and the positive pressure increases, but the measured braking force decreases. The theoretical analysis is consistent with the experimental results.