The Design And Research Of Loading Control System For Aero-bearing Service Life Testing Bench

With the continuous improvement of China's aviation manufacturing industry,independent development and testing of aero-bearings with high reliability have become one of the important contents of China's basic equipment development plan.The aero-bearing service life testing bench studied in this paper analyzes the under load and movement conditions of the aero-bearing under real working conditions through the working condition simulation technology,and completes the fatigue life assessment and reliability test of the aero-bearing.By seeking a reasonable control strategy to ensure the stable and reliable loading process of the testing bench for a long time is the key to complete the service performance test of the aero-bearing.In this paper,the electro-hydraulic servo loading system of the testing bench is taken as the research object.With the aim of designing a load control strategy with high practical value and good control performance,the load simulation control technology of the testing bench is studied in depth.The main research contents are as follows:Part ?: Established the system's mathematical model.The overall structure of the testing bench and the hydraulic loading system are designed,and the composition of the testing bench's electro-hydraulic servo loading system is determined.According to the specific design index of the testing bench's loading system,each component is analyzed and the corresponding mathematical model is established.The transfer function of the electro-hydraulic servo loading system is deduced and the value of the parameter is determined,which provides the necessary basis to seek a reasonable load control strategy for the subsequent search.Part ?: Fuzzy PID controller design and simulation verification.Faced with the problem that the electro-hydraulic servo loading system internal and external disturbance cannot be accurately estimated,the fuzzy PID compound control strategy and fuzzy self-adaptive PID control strategy are proposed to optimize the control effect of the loading system's load spectrum implementation process.By combining the mathematical model of the testing bench's electro-hydraulic servo loading system,a fuzzy PID compound controller and a fuzzy self-adaptive PID controller is designed,and the static and dynamic load spectrum's loading simulation is completed.The simulation verified that the fuzzy PID compound control strategy can effectively control the static load application process of the testing bench's loading system,and the fuzzy self-adaptive PID control strategy can more accurately complete the dynamic load simulation control.Part ?: Design and simulation verification of active disturbance rejection controller(ADRC).In order to further improve the versatility of the static and dynamic load application process,and to further optimized the control performance of the testing bench's loading system.Based on the previous analysis and study,the design of the ADRC is completed.It is verified through simulation that the ADRC can achieve better control of static and dynamic loads.Part ?: System implementation.According to the relevant requirements and technical specifications of the loading test,determined the composition of the load control system,the hardware selection and setup of the testing bench's electro-hydraulic servo loading control system are completed.Then,completed the closed-loop loading control program of the lower machine,and implemented the design of communication program.Meanwhile,the design of data acquisition,analysis and storage program and human-machine interaction program are completed.