新型局域共振橡胶减振垫振动传递特性测试分析

Test and Analysis of Vibration Transfer Characteristics of New Rubber Isolation Pad

为了研究一种应用于浮置板轨道结构的新型橡胶减振垫的振动传递特性,对比某基于局域共振新型减振垫与普通橡胶减振垫的减振性能,研究预压质量与激振加速度对振动传递特性的影响,对新型橡胶减振垫进行刚度试验与振动传递特性试验,测试其在30~200 Hz频率下的传递特性,试验过程中采用不同的预压质量与激振加速度,振动传递特性测试采用加速度激振的方法,以加速度传递率作为减振垫振动传递特性的评价指标。结果表明:新型减振垫加速度传递率更小,减振效果更好,最大可以减小10 dB左右;减振垫上方预压质量对振动传递特性有较大影响,预压质量越大,加速度传递率越大,减振效果越差;减振垫的刚度对其振动传递特性有一定的影响,激振的加速度幅值对加速度传递率影响较小。

In order to study the vibration transfer characteristics of a new rubber damping pad applied to the floating slab track structure, the comparison of the vibration damping performances of a new type of local vibration reduction pad with the ordinary rubber damping pad is conducted to study the influence of the preloading quality and excitation acceleration on the vibration transfer characteristics, and stiffness and vibration transfer characteristics of the new rubber damping pad are tested at 30~200 Hz. Different pre-compression masses and excitation accelerations are used during the test. The transfer characteristic test adopts the method of acceleration excitation, and the acceleration transfer rate is used as an evaluation index. The results show that the new vibration-damping pad has smaller acceleration transfer rate and better damping effect with about 10 dB reduction. The pre-compression mass above the damping pad has great influence on the vibration transfer characteristics. The greater the acceleration transfer rate, the worse the damping effect;the stiffness of the damping pad has certain influence on the vibration transfer characteristics, and the acceleration amplitude of the excitation has little effect on the acceleration transfer rate.