Research On Control Strategy Of Oil And Gas Suspension System For Large Tonnage All - Terrain Crane

Nine-axle all terrain crane have more superior chassis suspension system than other vehicle. In recent years, the use of hydro-pneumatic of interconnected suspension system can promote the use of the vehicle suspension performance within a certain extent. And it is not feasible for us to improve the performance of suspension system only by the way of researching the passive suspension. The active suspension system can change control strategy automatically according to the traffic, achieve the purpose of the adaptive traffic and meet the demand of all kinds of road conditions.The paper analyze the working principle of the hydro-pneumatic suspension crane, establish the interconnection of the type of oil and gas suspension system model based on power bond graph theory, and list the corresponding state equation. Besides, this paper studied the influence of the vibration characteristics of the suspension system caused by the road surface roughness excitation based on the MATLAB/SIMULINK.Based on the fuzzy control theory designed a kind of all terrain crane feed-forward control system. The road roughness stochastic excitation was blurred into eight level road feature model which used as the input signal X1, speed was blurred into characteristic model which used as the input signal level five X2. The goal of fuzzy control by the "great- tiny" control rules designed to generate control signal Y, then blur to the driving signal which is used to drive the throttle valve control type, achieving fuzzy control of the suspension system.Based on the theory of optimal control can designed the feedback control system, and obtained the optimal control force. Thus, it is established the model of the active suspension system. The simulation results of the random excitation of the D pavement show that the active control can effectively reduce the amplitude of the body vibration in each frequency domain.