增强泡沫塑料隔振器动态性能的实验研究

对一种增强泡沫塑料隔振器动态性能进行实验研究,研究表明:这种隔振器具有强非线性滞后特性,恢复力受频率和振幅影响并与变形历史有关,恢复力滞后回线的形状和大小与隔振器的刚度和阻尼特性有关。针对隔振器的强非线性滞后特性,提出从能量分析出发,将这一复杂系统中的恢复力分解成保守力与非保守力,即将隔振器恢复力分解成弹性恢复力和阻尼力,由此提出建立能合理描述隔振器动力学特性数学模型的建模方法。实践证明:这是一种巧妙的建模方法,它为这类隔振器数学模型建立及参数辨识提供了有效手段,为隔振器动力学设计及动力优化奠定了良好基础。本文作者提出的研究方法对其它非线性滞后系统的分析有借鉴作用。

EXPERIMENTAL INVESTIGATIONS ON DYNAMIC PERFORMANCE OF VIBRATION ISOLATOR MADE OF REINFORCED FOAM PLASTICS

Dynamic performance of a novel vibration isolator made of reinforced foam plastics is investigated in this paper. Experimental results show that, under steady periodic excitation, the isolator has strong nonlinear hysteretic characteristics, the restoring force of the isolator is influenced by the exciting frequency and vibration amplitude and is relative with the deformation history, and the shape of hysteretic loops of the restoring force is related to the stiffness and damping characteristics in the isolator. In view of the characteristics, a new smart idea of modeling is presented. According to the energy analysis, the restoring force can be decomposed into conservative force and non-conservative force, viz. elastic restoring force and damping force. The study has proved the idea of modeling is an ingenious one, which provides a useful means for modeling and parameters identification of the isolator. It lays a good foundation for dynamic design and dynamic optimization of the vibration isolator. The presented method can also be used for reference for other nonlinear hysteretic system analyses.