Research on the Influence of Dynamic Transmission Characteristics of a Two-Stage Vibration Isolation System for Laser Inertial Products

Based on the relevant theories of structural dynamics, this study fully considers the coupling effects between subsystems resulting from the design of inward and outward vibration stiffness parameters in a two-stage vibration isolation system. A dynamic transmission characteristics model of the two-stage vibration isolation system in response to external vibration environments has been established. The theoretical derivation of the impact of the external vibration environment on the core IMU components of laser inertial systems has been completed. Utilizing a method for calculating the dynamic coupling coefficients of the two-stage vibration isolation system, this research provides a theoretical basis for the parameter design and improvement of the vibration isolation system used in laser inertial products. Guided by this theory, a two-stage vibration isolation system was designed, ensuring a rational distribution of output frequencies and the root mean square (RMS) acceleration responses of the IMU components across the entire frequency range. Finally, flight tests were conducted, and the results demonstrate that the two-stage vibration isolation system, designed based on this dynamic transmission characteristics model, can effectively mitigate the normal jitter of the laser gyroscope while achieving significant attenuation of the RMS acceleration response of the IMU components across all frequency ranges, thereby ensuring the output precision of the inertial products.