用于水下推进系统的先导比例减压阀的稳定性

Stability of pilot-operated proportional pressure reducing valve used in underwater propulsion system

针对伺服阀控式推进系统效率低、成本高的问题,提出先导比例减压阀控式液压推进系统应用于水下机器人.在螺旋桨低速运行时,推进系统的负载特性会引起减压阀出口压力不稳定.根据螺旋桨转速推力曲线与减压阀压力流量方程,对阀进行非线性化建模分析,研究管道有效弹性模量和液压油黏度等系统参数对减压阀稳定性的影响.基于Matlab建立物理模型进行仿真研究,搭建推进器测试台架进行水池试验.仿真和水池试验结果表明,在优化系统结构参数后,该比例减压阀具有较好的稳定性,可以提高系统效率,降低制造维护成本.

A underwater hydraulic propulsion system controlled by pilot-operated proportional pressure re- ducing valves was proposed, which has a much lower cost and a higher efficiency compared with servo valve control systems. While the propeller was running at a low shaft speed, the load characteristics may lead to pressure vibration of reducing valve. The non-linearized valve model was conducted according to the load characteristics of the propeller and the flow equation. The hydraulic parameters which may influence the valve stability such as the effective bulk modulus and the fluid viscosity were analyzed. A computer simulation model was established based on Matlab, and the test bench of the propulsion system was devel- oped. Both the simulation results and the test results indicated that the pressure reducing valve had good stability while the correct structure parameters were selected. The system efficiency was improved and the costs were decreased to manufacture and maintain.