Study On The Open-loop Transformation Of Wide Bandwidth Inertial Reference Stabilization Platform Based On MHD Sensor

The wide bandwidth inertial stabilization platform plays an important role in improving the performance of the Acquisition,Tracking and Pointing(ATP)system.wide bandwidth inertial stabilization platform is relatively backward in China,so it is of great significance for its research.Its system model analysis is the basis for deepening research and application.In this paper,the wide bandwidth inertial stabilization platform is modeled,and the method of obtaining its precise open-loop transfer function is studied to provide a basis for closed-loop control.The design method is compensated for the resonance problem found in the modeling process.First,based on the system working principle and structural analysis,a theoretical model is established.Then the system accurate method and resonance characteristics are obtained by the system identification method.After analyzing the influence of resonance on the system model and closed-loop performance,comparing the advantages and disadvantages of different resonance suppression methods and their feasibility in the system,choose to design and implement an improved double T-type notch filter to solve the system resonance problem,which is closed-loop control.System design and optimization laid the foundation.The main contents of the article are as follows:1.Consider the special mechanical structure and working principle of the wide bandwidth inertia stabilization platform and establish a system theoretical model.For most of the literature,the problem of mechanical resonance on the system model is not considered.The system resonance characteristics are analyzed completely,and the system low-order resonance model and high-order coupled resonance model are established to modify the theoretical model.Finally,a more accurate theoretical model of the wide bandwidth inertial stability platform is obtained.2.For the first-order mechanical problem of stable platform,by comparing different resonance suppression methods,it is determined that the trap method is used for resonance compensation.For the traditional double T-type notch filter,the notch width and depth can not be designed independently.The design and implementation of the improved double T-type notch filter are selected,and the suppression effect is verified by various simulation methods.3.Design and implement the experimental system hardware structure and software structure.The system identification experiment obtained the system accurate model and provided experimental verification for theoretical modeling.And obtain the 28 d B resonance characteristics of the system at 34.5Hz,which provides the basis for the trap design.The resonance suppression experiment verifies the resonance suppression effect.The open-loop experiment results show that the improved double T-type notch filter can effectively improve the open-loop model of the broadband inertial stability platform,eliminate the influence of resonance,and have little influence on other frequency bands of the system.The closed-loop experimental results show that the improved double Ttype trap can effectively improve the closed-loop performance of the system.The peak resonance attenuation reaches 63.03% and the average resonance attenuation reaches79.37%.The closed-loop response oscillation of the system is obviously suppressed.The system adjustment time is reduced by 36.2%,and the closed-loop bandwidth is extended,which provides a guarantee for a high-performance inertial stability platform.