Research On The Test System Of High-Pressure (28MPa) Reciprocating Seals

The high-pressure reciprocating seals, as vital components of aircraft actuators, have a profound effect on the performance and reliability of aircrafts. Therefore, it is of great significance to develop a test system, on which high-pressure reciprocating seals can be evaluated and validated.Based on the project of the Long-Life Sealing Validating System and the requirements of 28MPa pressure level hydraulic system which will be used in future aircrafts, the test system of high-pressure(28MPa) reciprocating seals is developed. The main contents of the thesis are given as follows:In chapter 1, the research background and present situation of the test system of high-pressure reciprocating seals at home and abroad are introduced. The significance, targets, and contents of the research are emphasized and some relevant key technologies are outlined.In chapter 2, the general design of the test system of high-pressure(28MPa) reciprocating seals is carried out. According to the system requirements, the composition and principle are proposed and three subsystems, including the hydraulic system, the loading system, and the environment-simulation system are designed overall. The characteristics of the loading system are studied particularly, and the layout of the whole system is presented in 3D models.In chapter 3, characteristic analysis of the stroke control system is given. According to the requirements of stroke control, the basic principle of valve-controlled asymmetric cylinder is proposed. The mathematic model of the stroke control is built and the sectional PID control algorithm is developed. The multi-cylinders motion synchronism is analysed by means of ADAMS and AMESim co-simulation and a solution is put forward for reducing the motion error of cylinders.In chapter 4, characteristic analysis of the pressure impulse control system is presented. The realization principle of the different impulse waves is identified by referring to the pressure impulse standards. The influence of the key parameters including pressure and flowrate on pulse waves is modeled and analysed. The simulation and test results have shown that the models and the principle of the subsystem work well.In chapter 5, characteristic analysis of the temperature control system is given. The temperature control system is developed for controlling the temperature of the working environment and the fluid in the cylinders. The models of the temperature system in AMESim and ANSYS are built separately, and the dynamic temperature characteristics of the hydraulic system and the working environment are analysed. The research results validate the subsystem.In chapter 6, the research progress and achievements are summarized and the future research works are pointed out.