O型钢丝绳隔振器的三向动态特性

Research on the Dynamic Behavior of O Type Wire-Cable Vibration Isolator in Three Modes

采用周期动态加载试验方法,分别获得了O型钢丝绳隔振器在剪切、横滚和拉压方向上随激励振幅和频率变化的动态迟滞特性。在剪切和横滚方向,试验迟滞环呈现对称特性;在拉压方向上,试验迟滞环呈现非对称迟滞特性,并随着激励幅值的增加,迟滞环面积增大而且非对称迟滞特性表现的更加明显;在拉伸方向上拥有硬化刚度;压缩方向上刚度明显软化。在测试频率段,隔振器3个承载方向的滞回性能与频率无关。针对隔振器的三向动态特性,提出一种改进的归一化Bouc-Wen模型和一种简单有效的参数识别方法,并基于试验数据验证该模型和参数识别方法的有效性。结果表明,试验曲线和理论模型预测曲线吻合较好,该模型和方法能够分别有效描述隔振器的三向动态特性。

A series of dynamic tests was carried out on an O type wire-cable vibration isolator by imposing cyclic sinusoidal motion to obtain its variations in hysteretic behavior with excitation amplitude and frequency in shear, roll and tension-compression, respectively. In shear and roll modes, the isolator exhibited symmetric hysteresis loops under cyclic loading. In the tension-compression mode, the isolator exhibited asymmetric hysteresis loops. As the displacement amplitude increased, stiffening and softening occurred along the tension and compression direction, respectively. The hysteresis loop area increased, and the asymmetric hysteresis became apparent. The rate-independent nature of wire cable isolators in the tested frequency range has been experimentally verified in shear, roll and tension-compression. A modified normalized Bouc-Wen model and a simple yet effective identification method were proposed to describe the hysteretic behavior of the isolator in three modes. The proposed model and identification method were validated with the results, which verified that the predicted hysteresis loops were close to the measured hysteresis loops, and the proposed model and method were effective for describing dynamic hysteresis behavior of vibration isolator in three modes. © 2016, Editorial Department of JVMD. All right reserved.