【作者】 陈继文；

【导师】 刘冀民；

【作者基本信息】 湖南农业大学 ， 农业机械化工程， 2004， 硕士

【摘要】 本文以单出杆液压缸为执行元件的旁路节流调速系统为研究对象，在旁路上分别串接节流阀和调速阀。当负载发生阶跃变化时，对液压缸无杆腔压力p₁的变化进行了试验研究。 通过试验研究得出系统在不同的流量阀开度、不同溢流阀限定压力下，给系统施加不同的阶跃负载信号，液压缸无杆腔压力p₁的动态变化规律。 当旁路节流调速系统的旁路上串接节流阀时： 在固定某一节流阀开度、固定某一溢流阀限定压力、固定某一液压缸活塞工作位置的情况下，随着阶跃负载的增加，液压缸无杆腔压力p₁的超调量和调整时间增加；上升时间和峰值时间减小。 在固定某一溢流阀限定压力、固定某一液压缸活塞工作位置，固定某一阶跃负载的情况下，随着节流阀开度的增加，液压缸无杆腔压力p₁的超调量和调整时间减小；上升时间和峰值时间增加。 当旁路节流调速系统的旁路上串接调速阀时： 液压缸无杆腔压力p₁的动态变化规律与旁路节流调速系统的旁路上串接节流阀时液压缸无杆腔压力p₁的动态变化规律相同。 通过试验研究得出：旁路节流调速系统中液压缸无杆腔压力p₁的最大超调量选取的经验表格、旁路节流调系统中液压元件主参数（额定压力）计算公式以及选择方法。 在对旁路节流调速系统液压缸无杆腔压力p₁随负载变化的动态特性进行理论分析时，用解析法建立了以负载F（s）为输入，压力P₁（s）为输出的数学模型，进行时间响应分析，其理论分析结果与试验结果相吻合。更多还原

【Abstract】 Use the throttle speed governing system with by-pass oil way in which the hydraulic cylinder was the executive as research object in this thesis , the trial research about the effect on the pressure p1 of the hydraulic cylinder chamber without piston-rod when series-connecting throttle or timing valve on the by-pass oil way under the step load changing have made.Accorded to the trial research, under different flow area of flow valve and different adjusted pressure of relief valve , conclusion that the regulation of the pressure pt of the hydraulic cylinder chamber without piston-rod varied with the change of step load were as follows:When the throttle was series-connected on the by-pass oil-line in the throttle speed governing system with by-pass oil way :Under the same fixed flow area , the same settled pressure adjusted by the relief valve and piston-rod in the same fixed position in the hydraulic cylinder , with the incremental value of step load, the pressure p1 highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod and the adjustive time all increased, meanwhile, it’s time of rising and peak value time all decreased.Under the same settled pressure adjusted by the relief valve, piston-rod in the same fixed position in the hydraulic cylinder and the same fixed value of the step load, with the incremental value of the flow area of the throttle valve, the pressure p1 highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod and the adjustive time all decreased. At the same time , it’s time of rising and peak value time all increased.When the timing valve was series-connected on the by-pass oil-line in the throttle speed governing system involving by-pass oil way :The dynamic changing rule of the pressure p1 of the hydraulic cylinder chamber without piston-rod is just like that of the Pressure p1 of the hydrauliccylinder chamber without piston-rod in the throttle speed governing system with the throttle series-connected in the by-pass oil wayThrough trial research, the calculation formula that the pressure highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod varied with the change of step load and the formula about hydraulic elements main parameter (rated pressure) were both made, which had important valuation in selecting the main parameter about this hydraulic system.This thesis also have constructed mathematic model based on the analytic method, which used the load as input and the pressure as output. At the same time, it have made theoretic analysis of time response. The theoretic analysis was highly agreed with the experimental result.更多还原