Abstract
Volume speed-modulating loop refers to a loop where changing the displacement of the variable pump or the variable motor can adjust the speed of actuating element. In this paper,the study of the hydraulic volume speed-modulating experiment has carried on the detailed analysis and design.
First of all,this article analyzes three types of volume speed-modulating loop of the basic principle（Variable pump—quantitative motor, quantitative pump—variable motor, variable pump— variable motor ）.On this basis,we design the specific experiment plan.Secondly,we explored to conduct a large number of experiments in the lab.We got the preliminary experimental data.Again,after dealing with the experimental data,we tried to summarize the relationships between the displacement、revolving speed、torque、power in the volume speed-modulating loop.Finally,by doing the MATLAB simulation of this experiment and calculating the data of the related theory,we can calculate the efficiency of this experiment.

Through the experiments of hydraulic circuits, it is beneficial to exercise ability and logical analysis.
Keywords:  Hydraulic speed control loop；Volume speed-modulating experiment；Hydraulic experiment

Abstract    II

1.1  本实验的背景和意义    2
1.2  容积调速系统实验的优缺点    3
1.3  本论文的主要内容    4

2.1 容积调速实验的目的    5
2.2  实验设备、仪器    5
2.3 元件介绍    6
2.4 变量泵—定量马达调速回路    14
2.4 定量泵和变速马达容积调速回路    16
2.6 变量泵和变量马达容积调速回路    16

3.1   测量的物理量    18
3.2  实验步骤与数据    18
3.3   定量泵-变量马达实际回路的转速特性    21
3.4   变量泵—定量马达实际回路的转速特性    22
3.4.1 实验数据    23
3.4.2 马达负载特性分析    23
3.5  变量泵—变量马达实际回路的转速特性    25

4.1  系统数学模型的建立    28
4.2 系统动态分析    29
4.3  实验误差分析    31 源`自*六)维[论*文'网www.lwfree.cn
4.3.1  排量损失    31