An investigation on coupling analysis and vibration rectification of vibration isolation system for strap-down inertia measurement unit

Abstract

ABSTRACT The development and deployment of high-precision positioning and orientation systems rely heavily on strap-down inertial measurement units (IMU), which are an integral part of aircraft navigation and launch systems. However, careful study and ongoing use of microelectromechanical systems inertial sensor assemblies (MEMS ISA) present the challenge of vibration disturbances that can significantly degrade the performance of IMU. To alleviate this problem, this paper proposes a vibration isolation system (VIS) based on a motion decoupling mechanism. The designed VIS dynamically decouples 6 degrees of freedom motion, effectively isolating the IMU from external vibrations while allowing free movement, thereby significantly improving control of vibration-induced motion changes. Our approach is validated through finite element simulations and random vibration tests, showing that the proposed VIS effectively reduces transmission measurement errors in IMU. The sensitivity of MEMS ISA to various vibration amplitudes and frequencies can lead to severe vibration correction errors. Therefore, reducing noise and offset is critical for systems that must operate reliably in harsh environments. This study not only explores vibration correction, but also provides a feasible solution through VIS design that can significantly reduce noise and deviation, helping to improve the durability and accuracy of the system. This research is clear that integrating well-designed VIS can significantly improve the resilience and accuracy of MEMS-based inertial systems, paving the way for more robust applications in the aerospace and defense industry.