Modeling And Simulation Study Of The Dynamic Characteristics Of The Hydraulic System Of Excavator Work

The excavator is one of the main aircraft types of the engineering machinery. With the progressive application of hydraulic technology and the enlargement of the range, quantity and quality to the excavators have all put forward higher requirement. How to improve the control precision of the excavator, to strengthen environmental adaptive capacity, to improve dynamic quality, to shorten design cycle, to optimize systematic scheme are problems solved urgently by people.Studying dynamic characteristic of hydraulic systematic of excavator work device, analyzing the influencing factor of dynamic quality, proposing the improving measures, are important to solving problem described above and improving quality of the excavator.On the basis of summarizing the domestic and international excavator, the author pointed out that general composition mode of the hydraulic system of device is hydraulic pump - hydraulic valve - hydraulic jar.The author set up the mathematical model of the hydraulic primary element. Utilizing the upward structure of Matlab/Simulink toolbox, the author produced whole hydraulic loud of system, and entrust suitable module parameter to the number value according to the actual conditions.The author simplified complicated and changeable load appropriately into four kinds of typical situation, imitated different modes by inputting different signals and carried on emulation.The author analyzed artificial result, researched influence of dynamic characteristic to excavator by different parameter, and put forward the corresponding improvement measure.The author designed the Scheme of installing accumulator at excavator in order to raise Dynamic quality, carried on the discussion and researched this schemeOn the basis of artificial result, the result of that accumulator absorb the hydraulic systematic pressure and improve the dynamic characteristic of hydraulic systematic obviously were found.The modeling and artificial method of the hydraulic system of job device of the excavator which the author put forward can also be used in the round and walk deviceof excavator and other engineering machinery after appropriate change.