地铁车辆直型辐板阻尼环车轮声振特性分析

为探究地铁车辆阻尼环扩张状态对阻尼环车轮声振特性影响,在半消声室内进行阻尼环车轮自由状态下的声振特性实验研究,结合有限元仿真对实验结果进行分析。研究表明,环-轮组合振动固有频率与原车轮相比变化不大,但阻尼环使车轮的模态阻尼比显著增加,有效抑制了车轮各模态的振动幅值。改变阻尼环扩张状态,阻尼环降噪效果发生非线性变化,幅值在5.6 dB(A)之内。阻尼环扩张状态可通过调节非闭合阻尼环两端扩张装置来改变。阻尼环处于非最大扩张状态W_3时,可获得最佳降噪效果。

Analysis on Sound and Vibration Characteristics of Wheel with Circular Shock Absorber in Subway Vehicles

The sound and vibration characteristics of the damping ring wheel are studied in the semi - anechoic chamber. The effects of different damping rings on the acoustic and vibration characteristics of the wheel are discussed. The results show that the damping ring does not change the natural frequency of the wheel, but the damping ring will significantly increase the modal damping ratio of the wheel and effectively suppress the vibration amplitude of each mode of the wheel; Changing the damping ring expansion state leads to nonlinear changes in the damping ring noise reduction, the noise reduction amplitude is within 5.6dB (A); The damping ring expansion state can be changed by adjusting the end of the non-closed damping ring expansion device. When the damping ring is in the non maximum expansion state W_3, the optimum noise reduction effect can be obtained.