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以液压挖掘机振动减阻为目的,对振动掘削系统动态特性进行研究。为了从理论上分析系统特性,建立振动掘削系统数学模型,确立比例放大环节、电-机械转换环节、先导阀-主阀环节的传递函数。并建立振动掘削系统动态特性仿真模型,通过定压差压力突变法对阀芯位移、流量阶跃响应特性进行仿真分析,对振动掘削系统频率响应特性进行仿真分析。仿真结果表明:阀芯位移、流量阶跃响应调整时间分别为0.06 s、0.18 s,超调量分别为4.01%、3.17%;矩形波、正弦波、三角波三种波形下系统流量控制误差分别为8.27%、5.5%、7.2%。最后,以某90型液压挖掘机为平台对模型进行试验验证。
With the purpose of reducing the vibration of hydraulic excavator, the dynamic characteristics of the vibration excavation system are studied. In order to theoretically analyze the characteristics of the system, a mathematical model of vibration excavation system is established, and the transfer function of proportional amplification, electro-mechanical conversion and pilot-to-main valve is established. The simulation model of the dynamic characteristics of the vibrating excavation system is set up, and the simulation of the valve spool displacement and flow step response characteristics is carried out by the constant pressure differential pressure mutation method. The frequency response characteristics of the vibrating excavation system are simulated and analyzed. The simulation results show that the valve spool displacement and flow step response adjustment time are 0.06 s and 0.18 s respectively, and the overshoots are 4.01% and 3.17% respectively. The error of system flow control under the three waveforms of rectangular wave, sine wave and triangular wave are 8.27%, 5.5%, 7.2%. Finally, a model 90 hydraulic excavator as a platform for experimental verification.