Damping in jointed friction plates with partially overlapping interfaces
Damping in jointed friction plates with partially overlapping interfaces
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发表时间：
2013-04
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通讯作者：
F. Kuratani;T. Hirai;K. Koide;Ichiro Kido
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作者：
F. Kuratani;T. Hirai;K. Koide;Ichiro Kido
机械连接，如螺栓和点焊影响振动阻尼的组装结构。在本文中，我们研究的阻尼特性，由于在关节摩擦，以增加阻尼的组装结构。所考虑的结构由三块钢板（主长板夹在两块短板之间）用螺栓连接而成。首先，我们评估阻尼特性的基础上获得的线性有限元模型的模态振型。其次，我们评估的阻尼特性的基础上的能量耗散的接口，计算从接触信息（接触压力，接触面积和滑动距离）从一个非线性有限元模型静态接触分析。为了验证该过程，测试结构的模态阻尼比的估计值和测量值进行了比较，从第一至第五弯曲模态的模态阻尼比的估计变化与测量变化吻合良好。主要结论是，大的能量耗散发生在边缘区域的冲击板和能量耗散和振动能量的每一个模式取决于模式的形状（对称或不对称弯曲模式）。这导致了每种模式的模态阻尼比的差异。
Mechanical joints such as bolts and spot welds affect vibration damping of assembled structures. In this paper, we investigate the characteristics of damping due to friction in joints to increase damping of assembled structures. The structure considered consists of three steel plates (main long plate sandwiched in between two short plates) jointed with bolts. First, we evaluate the damping characteristics based on the mode shapes obtained from a linear FE model. Second, we evaluate the damping characteristics based on energy dissipation at the interfaces, being calculated from the contact information (contact pressure, contact area and sliding distance) obtained from a nonlinear FE model by static contact analysis. To validate the procedure, the estimated and measured modal damping ratios of the test structure are compared and the estimated change in modal damping ratio from 1st to 5th bending mode is in good agreement with the measured change. The primary conclusion is that the large energy dissipation occurs at the edge area of the shot plates and the energy dissipation and the vibration energy for each mode vary depending on mode shape (symmetric or asymmetric bending modes). This leads to the differences in the modal damping ratio for each mode.