| Marine hydraulic equipment is developing in the direction of high pressure,high speed and integration,and the requirements for the stability,reliability and safety of hydraulic systems are becoming increasingly strict.At present,marine hydraulic equipment mostly uses mineral hydraulic oil as the working medium,and mineral hydraulic oil is flammable,which will definitely cause great hidden dangers to the safety of ships and people.With its excellent performance,HFC fire resistant hydraulic fluid becomes an ideal working medium for hydraulic systems in fire danger or enclosed spaces.However,due to its low working pressure,its application in the marine industry is still rare.In order to improve the safety performance of the marine hydraulic system,improve the performance evaluation system of hydraulic oil products,improve the independent research and development strength of domestic oil products,and promote the application of HFC fire resistant hydraulic fluid.In this paper,aiming at the performance evaluation test of HFC fire resistant hydraulic fluid,a plunger pump test bench is designed,and the dynamic response characteristics of the test bench are studied and analyzed.The main research contents and results are as follows:（1）The research background of the subject of plunger pump test bench for the performance evaluation of HFC flame retardant liquid is described,and the research status of hydraulic oil performance evaluation test bench at home and abroad is introduced.According to the current research problems,the development trend of marine hydraulic system and the characteristics of HFC fire resistant hydraulic fluid used,the research content of this article is clarified.（2）According to the US Navy’s MIL-H-22072 standard,the main technical indexes of the test bench and its test evaluation scheme are determined,and the key factors affecting the evaluation results are briefly analyzed.Then,based on the working condition requirements of the test bench,the bench hydraulic system is designed in principle and selected for calculation.At the same time,using CATIA software to complete the structural design and field layout of the test bench.（3）The working principle of the plunger pump speed and load pressure control circuits are introduced separately,and the mathematical models of each circuit are established,and the block diagrams of the transfer function of each circuit are derived.The coupling relationship between speed and pressure is briefly analyzed,and the block diagram of speed control and pressure control are linked,to provide theoretical guidance for subsequent simulation analysis and controller design.（4）Based on the transfer function block diagram of the plunger pump speed and load pressure control circuit,using Matlab software build a simulation model,the simulation parameters are summarized,the effects of speed control gain and pressure control gain on speed and pressure control performance are analyzed by simulation,and a fuzzy PID controller is designed to improve the response characteristics of the speed and loading pressure of the plunger pump,to meet the index requirements of the bench test.（5）Using AMESim software to establish the simulation model of the test bench,and the fuzzy PID controller was introduced through the co-simulation interface,to complete the overall model construction of the system and simulate it.The results show that compared with the open-loop control,the pulsation of the plunger pump output flow can be significantly improved when the fuzzy PID control is used,and the pulsation amplitude has little effect on the evaluation of the test results,which meets the technical requirements of the bench test. |
