Design of Low-Frequency Vibration Isolation System for On-Board Inertial Navigation System in Agricultural Vehicles  

农用车辆车载惯导系统的低频隔振系统设计

作　　者：ZHOU Yang CHEN Cheng SUN Zhihong 周阳;陈成;孙志宏(东华大学机械工程学院,上海201620)

机构地区：[1]College of Mechanical Engineering,Donghua University,Shanghai 201620,China

出　　处：《Journal of Donghua University(English Edition)》2025年第1期54-63,共10页东华大学学报(英文版)

摘　　要：A small quasi-zero stiffness(QZS)vibration isolator is designed to be mounted on the roof of an agricultural vehicle for the working environment and vibration frequency of the inertial navigation system.By using the principle that the Euler beam has a negative stiffness in the critical state,the dynamic stiffness of the loaded QZS vibration isolator in the balance position tends to be close to zero by connecting a vertical spring in parallel.Firstly,the stiffness of the QZS vibration isolation system at the balance position is analyzed statically,and the material parameters and properties of the Euler beam are determined.Then,the dynamic equations are established,and the harmonic equilibrium method is used to solve the dynamic response under sinusoidal excitation to obtain the force transmissibility of the QZS vibration isolation system,and to make a comparison with that of the linear isolation system.Finally,the modal simulation,harmonic response simulation and random vibration simulation of the QZS vibration isolator are carried out through the finite element analysis,and the results show that the QZS vibration isolator has a lower initial isolation frequency and a larger isolation range,and the peak vibration isolation can reach about 11.58 dB.针对农用车辆在复杂工作环境下惯导系统的稳定性问题,设计了一种小型车顶安装式准零刚度隔振器:利用欧拉梁在临界状态时具有负刚度特性的原理,通过欧拉梁与竖直弹簧的并联,使得加载后的准零刚度隔振器在平衡位置的动刚度趋近于零。首先,通过对平衡位置时准零刚度隔振系统的刚度特性进行静力学分析,确定欧拉梁的材料参数和材料属性;其次,建立动力学方程,并采用谐波平衡法,求解在正弦激励下的动力学响应,获得其力传递率,并与线性隔振系统的力传递率进行对比;最后,通过有限元分析,对准零刚度隔振器进行模态仿真、谐响应仿真及随机振动仿真。仿真结果表明,准零刚度隔振器相较于线性隔振器具有更小的初始隔振频率,更大的隔振范围,峰值振动隔振可达到11.58 dB。

关 键 词：vibration isolator quasi-zero stiffness(QZS) BUCKLING Euler beam finite element analysis 

分 类 号：S219.03[农业科学—农业机械化工程]