H_∞ Control Of Equipment Control System For Structure Moving

Since structure moving technique appeared in our country in 1980s, in spite of a fewer successful cases, in light of demand of market and universality of application, the technique is underway in our country. Because of cost and technique etc., equipment used in engineering is basically rented or introduced. Self-determination development of the equipment is blank in our country. By far, there hasn't been automatic and intellectualized equipment used in structure moving. However, the equipment is one of the key of the building moving implement successfully. Hence, development of its control technique has good applied value.This paper mainly discusses H∞control of the electro-hydraulic proportional system-the subsystem of equipment control system for structure moving. The electro-hydraulic proportional system is an uncertain system. Its key control component, electro-hydraulic proportional reducing valve, exists backlash and dead band, and hydraulic system greatly influenced by temperature and load factors, so it is difficult to construct model in theory. System identification and curve fitting can solve the problem above.Regarding object's H∞norm as index, H∞control theory makes great progress in solving the model error and the uncertainties of parameters and tracking, which takes uncertainties of system into account and minimizes the disturbing effects on the system's anticipant output.Because of the complexities of operation and many uncertainties during the course of structure moving, H∞control theory is employed to solve the problem of restraining disturb and uncertainty of controlled object simultaneously. Compared with impulse, step, square wave response of the two systems with H∞controller and LQG controller, the paper confirms good track, moving calmly by applying H∞control theory to equipment control system for structure moving.