摘要
提出一种由正负刚度元件组成的双层高阻尼隔振器,并建立其系统动力学模型.分别采用拉氏变换给出其频响特性和力传递率,利用四阶龙格-库塔法得到其时域响应.通过与单层/双层参考线性隔振器和单层高阻尼隔振器的动力学特性对比,双层高阻尼隔振器可以在中低频段较宽范围内实现振动响应的有效控制,且对多频激励的控制效果最优.文中重点关注了高阻尼隔振器设计参数刚度比α和安全系数ε对其响应特性的影响.计算结果表明:参数选择合适,可实现高阻尼隔振器无谐振峰的振动控制效果.
A new double-layered isolator was proposed,compose of positive and negative stiffness elements.A dynamic mechanical model was established for the double-layered hyper-damping isolator.Based on this dynamic model,the frequency response characteristics,time history series and force transmission rate were provided,respectively,by using Laplace transformation and 4th-order Runge-Kutta methods.The calculation results show that,comparing the dynamic responses of the single-layered and double-layered reference linear isolators and single-layered hyper-damping isolators,the dynamic responses of the double-layered hyper-damping isolators can be controlled effectively in middle and low frequency domain.Especially,the double-layered isolator is optimal for the control of multi-frequency excitations.In addition,the influences of design parameters,stiffness ratioαand factor of safetyε,on the dynamic performance were also studied.According to the calculating results,the hyper-damping isolator can realize the dynamic performance without resonance peak when the design parameters are chosen properly.
作者
刘海平
罗婕
LIU Hai-ping;LUO Jie(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2020年第1期17-22,共6页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(51405014)
关键词
双层隔振
高阻尼
隔振器
响应特性
double-layered isolating
hyper-damping
isolator
response performance
