Research On Control System And Key Technologies Of High Temperature And Speed Abradable Tester

Abrasion under high temperature and high speed is the key indicator of evaluating coating performance in aeroengine. The most effective method of evaluating the abradability of seal coating abroad is the coating and blade rubbing research on the engine test bench under high temperature and high speed which simulates the real working condition. However, the absence of domestic relevant test equipment and the low test parameters resulted in very little progress. Therefore the development of high-power, high-temperature and high-speed abradable seal test facility is of great significance for the study of the high-performance seal coating.This paper, based on the comprehensive research of the related test equipment at home and abroad, studies the problems of equipment development, completing the design of the tester measurement and control system and putting forward several solutions for the key problems. The main research work as follows:(1) Computer automatic control system was developed on Delphi platform, which realizes the automatic control of test process, data management and query functions. Speed control adopts the double closed-loop control algorithm of PID subsection control and the precision of speed stability control is 1.3%o. The lubrication cooling subsystem independent control unit is achieved using the technique of PLC in combination with field instrument, which provides powerful guarantee for the stable operation of the power system. Micro incursion system which mainly employs the position controller based on subdivision control algorithm, and high precision grating ruler position feedback actualizes the control of step motor closed-loop servo.(2) Tester condition monitoring system is developed with the help of the Lab VIEW platform, at the same time, the hardware system architecture has been designed. The application of Implements the CRC data validation algorithm in Lab VIEW improves the accuracy of the data transmission. The further analysis of the vibration signals through spectrum analysis method and orbit graphics method provides important support for the pre-commissioning and stable operation of the tester.(3) The coating supersonic flame heating system has been designed through studying the feasibility of various heating mode. Temperature calibration testing shows that the temperature field is uniform. A set of high precision data acquisition system including the rubbing force of three-axes, the surface temperature of coating and rubbing acceleration the of test is designed and integrated. The zero position dynamic calibration method based on value trigger of rubbing force is presented, which improved the feed depth control precision of the system.The AST1000 high temperature and high speed abradable seal test facility has the highest tip linear velocity of 450 m/s, whose coating feed rate ranges from 2 to 2000 um/s and the heating temperature reaches 1000 ℃. Automatic control of the test is realizable. Meanwhile, the auxiliary system operation is stable and various test parameters during the test process are accurate and reliable. The test performance has reached and even exceeded the level of the same equipment abroad.