High Performance Servo Load Test Rig Developed

The object which this project would research was a high performance loaded servo test-bed. It could simulate the function of real servo and meet the requirement of stated guide line. The real servo not only had the high-demand technical guide line such as dynamic performance, stability and accuracy, but also had the bad-control factor such as large moment of inertia, over high speed characteristic, large timing range and nonlinear and so on. With the angle of controlling difficulty and designing cost, it was not suitable to develop and test on the real servo directly. It would be necessary to develop a loaded servo test-bed to simulate the function of real servo. The main task of this paper was stated as follows:(1) The total blue print and framework was designed. The loaded servo test-bed with up-down architecture into modules was carved up by function. Working principle was stated. The key departments was designed and the working process was researched deeply. The parameters was computed and the principle on the choice of main parts of loaded servo test-bed was analyzed.(2) The hardware of loaded servo test-bed was developed. Both the servo controller and parallel interface board were included. Axial angle coding , serial port increasing, RS-422 interface conversing , D/A conversing and operation magnifying were realized in the servo controller. Parallel communication interface conversing, RS-422 serial port communication were realized in the parallel interface board.(3) The software of loaded servo test-bed was designed. The communication software of servo controller and parallel interface board were designed. The total flow chart was got with the idea of software project. The detailed designing was given by the function need. The monitor software of upper controlling computer which could do the signal-producing, performance-analyzing, curve-showing was designed.(4) Servo controlling methods were researched. By the particularity of this loaded servo test-bed, three typical controlling methods which were PID algorithm with separated integrator, PID algorithm with divided scopes and feedforward-feedback compound controlling were designed. After installation and testing in the spot, the data result proved that this loaded servo test-bed had realized the required function and reached the technical guide line.