Vertical vibration isolator having piecewise‐constant restoring force
Vertical vibration isolator having piecewise‐constant restoring force
复制标题
DOI：
10.1002/eqe.915
复制
发表时间：
2009-10
影响因子：
4.5
通讯作者：
Y. Araki;Takehiko Asai;T. Masui
中科院分区：
文献类型：
--
作者：
Y. Araki;Takehiko Asai;T. Masui
提出了一种具有分段恒定恢复力的垂直隔振器，它属于一类被动的、非线性的隔振器。在竖向隔振中，直接使用低刚度元件会由于自重而导致不可接受的大变形。为了克服这一困难，我们应用了恒力弹簧的组合，每个恒力弹簧无论其拉伸程度如何都保持恒定的载荷。通过设置恒力弹簧，使隔振器具有分段恒定的恢复力，缓解了自重引起的过大变形问题，提供了静平衡状态下的稳定性和自定心能力，在保持机构简单紧凑的同时实现了大行程。此外，我们试图将响应加速度限制在容差内，而不考虑频谱和地震地面运动的大小。通过振动台试验和数值模拟验证了该隔振器的有效性。版权所有©2009 John Wiley&Sons，Ltd.
We present a vertical vibration isolator having a piecewise‐constant restoring force, which belongs to a class of passive and nonlinear vibration isolators. In vertical vibration isolation, direct use of low‐stiffness elements leads to unacceptably large deformations due to self‐weight. To overcome the difficulty, we apply a combination of constant‐force springs, each of which sustains a constant load regardless of its stretch. By arranging the constant‐force springs, so that the isolator has a piecewise‐constant restoring force, we alleviate the problem of the excessive deformation caused by self‐weight, provide stability at the static equilibrium state along with the self‐centering capability, and realize a large stroke while keeping the mechanism simple and compact. Further, we attempt to limit the response acceleration within a tolerance regardless of the frequency spectrum and the magnitude of earthquake ground motions. We demonstrate the effectiveness of the present isolator through shaking table tests and numerical simulations. Copyright © 2009 John Wiley & Sons, Ltd.