【作者】 周宏伟； 陈前；

【Author】 Hongwei Zhou ,Qian Chen (College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics, Nanjing 210016,china)

【机构】 南京航空航天大学航空宇航学院；

【摘要】 本文通过对垂直简谐激励条件下有机玻璃容器内的颗粒体和随机激励下装有颗粒阻尼器简支梁的动态特性进行研究,提出了与Nopd减振机理有关的动量交换和颗粒耗能的实验方法。实验结果表明,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,耗能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,且与激励频率无关。最后,通过装有颗粒阻尼器的简支梁减振实验对上面的结论予以有效验证。更多还原

【Abstract】 In this paper, an enclosure containing damping particles is experimentally investigated for thorough understanding its dynamic behaviors and the 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 key point at which the dissipated energy and the dynamic mass can be changed suddenly. At last, this conclusion is verified by the test on a free beam of particle damping.更多还原