摘要
目的保证惯性测量组合(Inertial Measuring Unit,IMU)减振系统具有良好的减振性能。方法建立测量组合的三维模型,为提高IMU的解耦率,调整IMU和支架的质心,使IMU的质心与4个隔振器的刚度中心基本重合。采用Mooney-Rivlin超弹性本构模型对橡胶隔振器的橡胶材料进行表征,并在此基础上建立IMU减振系统有限元模型,对IMU减振系统的频率响应和冲击响应进行分析,并对IMU减振系统进行振动和冲击试验。结果通过调整IMU质心位置和支架结构,使各阶模态能量解耦率都在80%以上;通过频率响应仿真分析,IMU减振系统在X,Y,Z方向上放大倍数分别为3.072,3.12,3.17;通过冲击响应仿真分析,IMU减振系统响应最大幅值为70.1g。结论通过实验验证了有限元模型的正确性和减振设计的有效性。
Objective To study the dynamic characteristics of vibration system in Inertial Measuring Unit （Inertial Measuring Unit, IMU） , so as to guarantee the good vibration damping performance of IMU vibration system. Methods The 3D model of the IMU was established and its centroid position and support were adjusted to make it almost coincide with the stiffness center of four vibration isolators, and to improve the decoupling rate of the vibration system. The Mooney-Rivlin hyperelastic constitutive model was used to characterize the rubber material of the rubber isolator and on that basis, and the finite element model of the IUM vibration system was built. The frequency response analysis and shock response analysis were carried out on the model. The vibration and shock experiments of the IMU vibration system were also presented. Results By adjusting the centroid position of IMU and the supporter framework,the energy decoupling rate of each order modal were all above 80% ; through the frequency response simulation analysis, the magnification in X, Y, Z of IMU vibration system was 3.072, 3.12, and 3.17, respectively; through the shock response simulation analysis, the maximum amplitude of IMU vibration system was 70.1g. Conclusion The experiment verifies that the finite element model is correct and the design of vibration isolation is effective.
出处
《装备环境工程》
CAS
2015年第3期22-28,共7页
Equipment Environmental Engineering
基金
国家自然科学基金(50775225)~~
关键词
惯性测量组合
有限元模型
动态特性
冲击响应
Inertial Measuring Unit
finite element model
dynamic characteristics
shock response
