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剪切增稠液在外载作用下粘度会迅速增大,基于剪切增稠液研制而成的阻尼器具有阻尼力大、响应快速、无能耗等优点,在阻尼耗能和冲击防护设备中具有重要的应用前景。本文使用振动台模拟半正弦脉冲信号,对集成剪切增稠液阻尼器的单自由度系统在不同冲击条件下的响应加速度和相对位移进行了研究,比较了冲击脉冲幅值和频率比对冲击隔离的影响,讨论了不同冲击条件下的系统阻尼比,得到了剪切增稠液阻尼器安装方式对其冲击隔离性能的影响。结果显示:冲击脉冲幅值对响应加速度幅值比影响不大;加速度幅值比随冲击脉冲频率比增大而迅速减小,相对位移幅值随频率比增大先减小再略微增大,然后继续减小;当剪切增稠液阻尼器横向安装时,其响应加速度幅值比更小,当安装夹角增大时,相对位移随之减小,系统阻尼比迅速增大。研究表明,剪切增稠液阻尼器能够提高单自由系统的冲击隔离性能。
The viscosity of shear thickening liquid increases rapidly under the action of external load. The damper developed on the basis of shear thickening liquid has the advantages of large damping force, fast response, no energy consumption, etc., and has the advantages of damping energy dissipation and impact protection equipment Important application prospects. In this paper, we used the shaking table to simulate the half-sine pulse signal, studied the response acceleration and relative displacement of the single-degree-of-freedom system with integrated shear thickening fluid damper under different impact conditions, and compared the effects of impact pulse amplitude and frequency The influence of isolation and damping on the impact isolation performance of the shear thickening fluid damper was discussed. The results show that the amplitude of shock pulse has little effect on the amplitude of response acceleration. The amplitude of acceleration decreases rapidly with the increase of shock pulse frequency ratio. The amplitude of relative displacement decreases first and then increases slightly with the increase of frequency ratio, And then continue to decrease. When the shear thickening fluid damper is transversely installed, the response acceleration amplitude ratio is smaller. When the installation angle increases, the relative displacement decreases, and the system damping ratio increases rapidly. Studies have shown that shear thickening fluid damper can improve the impact isolation performance of a single free system.