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火车停靠月台时车轮的制动哨声高达90～100dB(A),主要频率成份在4～5kHz间,而同轮箍和制动块的尺寸公差和磨损关系并不密切.研究表明,当车轮静止于铁轨上,箍和轮中心被夹紧时其主要振动频率在4～5kHz间,即使轮被全部制动,共振频率并无显著变化,而仅仅其损耗因子变化了一个数量级.所以为了降低制动哨声就必须对车轮腹板这个高度共振系统作阻尼处理.采用了二种方法.调谐吸振器和约束层阻尼.前者用8mm钢板制成含七个舌簧的阔齿板,其最低固有频率为4.5～5kHz.吸振器用螺栓
When the train stops at the platform, the wheel’s whistle is as high as 90 ~ 100dB (A), the main frequency component is between 4 ~ 5kHz, while the size tolerance and wear of the wheel rim and the brake pad are not closely related.Research shows that when Whenever the wheel is stationary on the rail, the main vibration frequency of the hoop and the wheel center is between 4 and 5 kHz, and even if the wheel is fully braked, the resonance frequency does not change significantly, but only the loss factor changes by an order of magnitude Reduce the brake whistle must be on the web of the wheel height of the damping system for the damping system.Two methods used to tune the vibration absorber and restraint layer damping.The former is made of 8mm steel plate with seven reed wide tooth plate, The minimum natural frequency of 4.5 ~ 5kHz. Shock absorber with bolts