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本文对由螺栓夹紧的金属表板和毛毡夹心所构成的摩擦阻尼层板进行了试验研究和有限元分析.这种板造价便宜,重量轻,阻尼性能好,在高空不会气化污染,宜于在宇航工程中应用.试验是针对不同的毡层厚度,不同的螺栓数目,和夹紧力的情况下进行的,结果表明:阻尼的形成主要依靠板毡之间的摩擦,夹毡板与等刚度的整体板比较,阻尼性能可提高三十多倍.文中还构造了层板矩形有限单元,并在考虑滑移机理的情况下,应用这种单元对悬臂矩形层板做了振动分析,计算结果与试验数据符合较好,频率计算误差在5%以内.
This paper carries out experimental research and finite element analysis on the friction damping laminate consisting of a bolted metal surface plate and a felt sandwich. This kind of plate is cheap, lightweight, and has good damping performance and will not gasify pollution at high altitude. Suitable for use in aerospace engineering. Tests are carried out for different felt thicknesses, different numbers of bolts, and clamping forces. The results show that the formation of damping depends mainly on the friction between the mats and the felt mats. The damping performance can be increased by more than 30 times compared with an isotropic monolithic plate. The rectangular finite element of the plate is also constructed in this paper. With consideration of the slip mechanism, a vibration analysis of the rectangular cantilever plate is performed using this element. The calculated results are in good agreement with the experimental data, and the frequency calculation error is within 5%.