摘要
特种车辆由于其作战、行驶环境复杂多变,使乘员及车载大型精密设备常暴露于低频大幅振动环境中,直接影响作战功效,甚至危及生命安全、引发严重的设备故障。为有效隔离其低频振动,开发了一种磁环型准零刚度隔振系统,对其系统刚度特性和隔振特性进行了理论与实验研究。基于磁电理论和刚度耦合理论,建立正、负刚度理论模型,获得了系统等效刚度,对其刚度机理与参数特性进行分析;进一步建立准零刚度隔振系统的非线性动力学模型,采用谐波平衡法和牛顿-拉夫森迭代法对系统非线性动力学方程进行求解,分析与评估其隔振特性,并搭建实验台进行验证。研究结果表明:负刚度机构具有明显的负刚度效应,与正刚度系统配合,可产生较宽的准零刚度区间;与线性系统相比,该准零刚度隔振系统隔振频带向低频区拓宽71.9%,共振峰值降低65.7%,稳态区间下位移响应幅值下降75%,加速度响应幅值下降80%,具有更宽的隔振频带和更大的振动衰减率。
Due to the complexity and changeability of the operational and driving environment of special vehicles,personnel and large onboard precision equipment are often exposed to the low-frequency and large-amplitude vibration environment,which directly affects the operational efficiency,even endangers personnel safety and causes serious equipment failure.In order to effectively isolate its low-frequency vibrations,a quasi-zero-stiffness vibration isolation system with magnetic rings is developed,and its system stiffness characteristics and vibration isolation characteristics are studied theoretically and experimentally.Based on the magnetoelectric theory and stiffness coupling theory,the theoretical models of positive and negative stiffness are established and the equivalent stiffness of the system is obtained,and its stiffness mechanism and parameter characteristics are analyzed.The nonlinear dynamic model of the quasi-zero stiffness vibration isolation system is further developed,and the nonlinear dynamic equations of the system are solved by the harmonic balance method and the Newton-Raphson iterative method,its vibration isolation characteristics are analyzed and evaluated,and an experimental bench is built for verification.The results show that:the negative stiffness mechanism has obvious negative stiffness effect and can produce a wider quasi-zero stiffness interval with the positive stiffness system;compared with the linear system,the isolation frequency band of the quasi-zero stiffness vibration isolation system is widened to the low-frequency region by 71.9%,and the resonance peak reduced by 65.7%,the displacement response amplitude decreased by 75%,and the acceleration response amplitude decreased by 80% in the steady-state interval,meaning that the system has a wider vibration isolation frequency band and a larger vibration decay rate.
作者
李占龙
张正
姜稳稳
刘琪
任志曌
王瑶
宋勇
LI Zhanlong;ZHANG Zheng;JIANG Wenwen;LIU Qi;REN Zhizhao;WANG Yao;SONG Yong(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China;School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130022,Jilin,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第6期1784-1794,共11页
Acta Armamentarii
基金
国家自然科学基金项目(52272401)
中国博士后科学基金项目(2019M661058)
山西省高校科技创新项目(2019L0635)。
关键词
特种车辆
准零刚度
磁环
非线性动力学
低频隔振
special vehicle
quasi-zero stiffness
magnetic rings
nonlinear dynamics
low-frequency vibration isolation
