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针对高速大功率三级阀控液压缸操动机构在冲击载荷下压力波动剧烈、制动末速度较大、相应实验成本高、部分实验参数难以获取等问题,结合主阀的实际复杂结构,采用综合建模与实验验证的方法建立三级阀和液压缸非线性动力学模型;分析阀控液压缸系统的位移、速度和冲击压力特性;研究柱塞参数(长度、直径、初始间隙)、柱塞形状与冲击压力峰值、制动末速度之间的关系,并确定合理取值区间与合适的柱塞形状。结果表明:液压缸柱塞结构和设计参数是导致阀控液压缸操动系统冲击压力峰值过高、制动末速度较大的主要原因;圆锥型柱塞对降低液压缸压力波动及制动末速度的效果显著。
In view of the problems of high speed and high power three-stage valve control hydraulic cylinder operating mechanism under the impact load such as severe pressure fluctuation, high brake end speed, high corresponding experimental cost and some experimental parameters difficult to obtain, combined with the actual complex structure of the main valve, The nonlinear dynamics model of three-stage valve and hydraulic cylinder was established by comprehensive modeling and experimental verification. The displacement, velocity and impact pressure characteristics of valve-controlled hydraulic cylinder system were analyzed. The parameters of piston (length, diameter, initial gap) The relationship between the plug shape and the peak value of impact pressure and the final brake speed is determined and the reasonable value interval and the proper plunger shape are determined. The results show that the structure and design parameters of the hydraulic cylinder are the main causes of the high peak value of the impact pressure of the valve-controlled hydraulic cylinder and the large velocity of the final brake. The conical piston reduces the pressure fluctuation of the hydraulic cylinder and the end of the brake The effect of speed is significant.