弹性支撑微颗粒阻尼的时效性研究

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摘要弹性支撑微颗粒阻尼器具有双层减振结构，外部为弹簧支撑，内部为微颗粒碰撞阻尼，将弹性变形与微颗粒碰撞耗能有效结合。对弹性支撑微颗粒阻尼器进行了持续50 h的正弦激励实验，实验结果表明弹性支撑微颗粒阻尼器能稳定消耗系统至少80%的能量。通过与单体碰撞阻尼，颗粒阻尼和弹性阻尼的实验比较揭示了弹性支撑微颗粒阻尼器的减振机理：内部微颗粒塑形变形,自由质量与阻尼器腔体的动量交换和外部弹簧吸振的共同作用，弹性支撑微颗粒阻尼器的外部弹簧能够消耗系统约50%的能量，使弹性支撑微颗粒阻尼器得阻尼效果随时间不断强化。根据上述减振机理，建立了弹性支撑微颗粒阻尼器的动力学模型，理论计算结果与实验结果进行比较，验证所建模型的正确性。运用该动力学模型对弹性支撑微颗粒阻尼器进行了优化，得到了该阻尼器的最优结构参数。

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	杜妍辰
	孙隐

关键词 ：弹性支撑, 颗粒, 阻尼, 时效性

Abstract：Elastically supported micro-particle damper has a double-layer damping structure with a spring support outside and a micro-particle impact damper inside, it effectively combines elastic deformation and micro-particle impact energy-dissipating. Here, an elastically supported micro-particle damper was tested under sinusoidal excitation for 50 hours. Results showed that the elastically supported micro-particle damper can steadily dissipate 80% of the system energy; contrastive tests for single body impact damping, particle damping and elastic damping reveal the damper’s vibration reduction mechanism: combined action of internal micro-particles plastic deformation, momentum exchanges between free masses and damper chamber, and external spring vibration-absorbing makes the damper’s damping effect strengthen over time; the damper’s external spring can dissipate about 50% of the system energy. According to the vibration reduction mechanism mentioned above, the dynamic model of the damper was established. The theoretical calculation results were compared with those of tests to verify the correctness of the built model. This dynamic model was used to optimize the proposed damper’s structure, and obtain its optimal structural parameters.

Key words： elastic support particle damping timeliness

收稿日期: 2018-11-01 出版日期: 2020-06-28

引用本文:

杜妍辰，孙隐. 弹性支撑微颗粒阻尼的时效性研究[J]. 振动与冲击, 2020, 39(13): 163-169.
DU Yanchen, SUN Yin. Timeliness of elastically supported micro-particle damping. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(13): 163-169.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I13/163

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