Research on the tracing accurate of force based on fuzzy-pi control for a high-speed landing system

Low-gravity simulation platforms play a crucial role in investigating motion states of the lander when landing on the surface of other planets. During the high-speed landing of landers, platforms demand for constant force in real time. A hybrid Fuzzy-PI strategy is proposed in this paper to improve the tracing accurate of force for the high-speed landing system. To enhance contrasts, conventional PI control scheme is also complemented. In view of the characteristic of large-inertia systems, influence of friction on the experiment cannot be neglected. Therefore, a friction measurement experiment is carried out to ensure the accuracy of the numerical simulation results. First, a theoretical model of the system comprised of motors, retarders, rollers and loads is analyzed. Furthermore, simulations of the theoretical model under different disturbing force are compared between these two control methods (Fuzzy-PI and PI), which verifies great effectiveness and performance of the proposed strategy. Finally, experiments are conducted to evaluate the model, and the results are satisfactory.