Mathematical model, simulation and testing study on damping characteristic controlled by proportional valve

摘要

Optimal value of accumulator entrance's parameter is different when the pressure impact and the rapidity is dissimilar. Based on the foundation that response capability of accumulator is changed when its entrance parameter and damping characteristic alters, one new pilot system is invented to closed-loop control it with proportional valve. Because of part of the parametor time-varying character and nonline arity in this system, it is separate into five parts, including proportional valve, joined pipe-line, filling valve, accumulator's air champer and its oil champer. Then mathematical model of this system is founded through parameterization, and some mathematical analysis study work is finished about it. During the simulation, when the pressure shock doesn't be changede, some parameters such as the jaw opening of proportional valve, length and diameter of accumulator's pipe-line, and accumulator's charge pressure are adjusted one by one. Different simulation curve lines are found out when whichever parameter is different. By analyzing these lines, the optimal entrance parameter is confirmed under this work condition[1,2]. Afterwards, the testing hydraulic circuit is designed and founded. During testing reserch, much work finished is aimed at the ability that accumulator absorbing same hydralic pressure shock. By validating the simulation and testing results, authors find that when accumulator entrance's parameters are optimal, accumulator's response ability will get great improvement[3,4]. Authors identify and consummate this accumulator system's mathematical model with least-squares procedure in MATLAB too. This paper will present both this mathematical model of accumulator system, and theory support for new adaptive feed-back control accumulator.