垂直简谐激励下阻尼颗粒动态特性研究

在垂直简谐激励条件下,通过稳态功率输入法对颗粒阻尼纵向耦合结构系统的动态特性进行了研究和分析。实验结果表明,在简谐激励作用下由颗粒体引起的周期脉冲力对系统的损耗功率并不产生影响,损耗功率只与激励频率有关。由颗粒体产生的损耗功率和附加质量存在明显的临界点(转捩点)现象,在临界点之前,阻尼颗粒不损耗能量,附加质量变化不明显;临界点之后,损耗功率随激励强度增加而增大,附加质量随激励幅值的增加而变小,且对激励频率的变化不敏感。最后,通过阻尼颗粒的相态特性对出现临界点值现象加以解释。

An Experimental Investigation on NOPD Coupled System in Vertical Direction

Damping particles dynamic characteristics are experimentally investigated for one to thoroughly understand their damping and mass behaviors and their dependence on acceleration and frequency. The steady state power technique is used to estimate the dissipated energy and the dynamic mass. As a result, there is a critical point at which the dissipated energy and the dynamic mass can be changed suddenly. The dependence of the loss factor on acceleration amplitude and frequency is verified and the 3-dimension contours of the loss factor are introduced for thoroughly understanding and validating the performance of damping particles.