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| Dynamics Analysis and Experimental Study of Vibration System in Inertial Measuring Unit |
| Received:March 16, 2015 Revised:June 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.03.004 |
| KeyWord:Inertial Measuring Unit finite element model dynamic characteristics shock response |
| Author | Institution |
| ZHENG Ling |
State Key Laboratory of Mechanical Transmission，Chongqing University，Chongqing ，China |
| FANG Zhan-peng |
State Key Laboratory of Mechanical Transmission，Chongqing University，Chongqing ，China |
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| Abstract: |
| 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. |
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