Design Of Oil Temperature Contral System For Endurance Test Platform Of Helicopter Rotor Booster

The helicopter rotor booster,which is an actuator that uses hydraulic oil as the working medium,assists the pilot to adjust the aircraft wing to control its flight direction and speed.Its working environment is bad,and the booster is often in high temperature working condition.In order to ensure the stability and reliability of its performance,the booster needs a series of tests,including durability tests,on the ground test bench before it is equipped,and the high-temperature endurance test is an important link.The Helicopter Rotor Booster Endurance Test Platform is a ground simulation device,which is used to supply high-temperature hydraulic oil to the booster,to simulate the force acting on the booster during the actual flight of the aircraft,and to simulate the pilot's manual operation of the booster.The high temperature hydraulic system is part of the booster durability test platform,it supplies booster with hydraulic oil,whose hydraulic oil temperature changes with the target curve.The oil temperature control system controls the inlet of the booster hydraulic oil temperature to meet the temperature curve requirements,the system has the characteristics of high heating temperature,temperature gradient over time,high temperature rise and fall rate,and continuous uninterrupted working time.In response to this feature and summing up the experience of previous generations,a temperature control scheme for the two-stage heating and return line cooling of the oil suction pipeline was proposed.Then,performed heat balance analysis on the high temperature hydraulic system,determine the heating power of the heater and the cooling power of the cooler,the design and component selection of the heating system and the cooling system are completed.According to the rules summarized in the previous temperature test and the features of the high temperature hydraulic system,the system selects the temperature control principle that complements the Ping-Pong control strategy with the PID control algorithm.That is,the PID control algorithm is used to separately control the high-power heater and the plate cooler so that the temperature of the oil at the outlet of the high-power heater and the temperature of the oil in the tank are approximately stabilized at a target temperature.The auxiliary heater adopts a Ping-Pong control strategy with a dead zone to achieve the oil temperature control target.Then,a touch-screen human-computer interaction system was developed,which has the functions of parameter setting,real-time display of temperature curve and response to user operations,and completed the design of the communication system to realize the data exchange of each system module.According to the control strategy,the PLC temperature control system was developed and commissioned,which is greatly improving the temperature overshoot phenomenon in the temperature control zone,solving the problems of delayed control of the oil temperature control and low control accuracy.The system has been successfully applied to a certain type of aircraft booster endurance test rig,with high control accuracy,high system response speed and expected performance requirements.Finally,in order to further improve the adaptability of the temperature control system and solve the problem that the temperature control system cannot fully realize the temperature change according to any curve,a fuzzy control strategy is proposed.The fuzzy control strategy is used to realize the control of the heater and the goal of the oil inlet temperature of the booster arbitrarily changing with the target temperature value is completed.This paper completes the design of the fuzzy controller and establishes a fuzzy controller query table.