Research And Implementation On Control Methode Of The Precision Centrifuge In The Composite Platform Body

Aerospace equipment generally works in the dynamic environment of the vibration and line acceleration. Navigation system needs the simulation experiment in this kind of complicated dynamic environment. Composite environment experiment provided by centrifuge and linear vibrator, can predict the unknowable characteristics and potential failures of the single environment experiment and be conducive to improve the performance of the aircraft navigation system or other equipment and the reliability. It can also improve the understanding of complex dynamic environment, calibrate the technical index of the inertial components and establish precise error coefficients. It can massively increase the reliability of aircraft navigation system, and enhance the research methods on simulation of space flight on the ground and the cognition of the consistency of heaven and earth. In this paper, as a background of the establishment of the ideal ground simulation overload and vibration experimental environment, study the control method and implementation of the centrifuge of the composite platform.By analysis of fluctuation torque of the precision centrifuge system and studying the whole structure of precision centrifuge, this paper explains the unbalanced form of the system, summarizes the vibration caused by dynamic unbalance in the high-speed rotating system is one of the causes of the system fluctuation torque, designs the implementation of dynamic balance, analyzes and calculates the feasibility of the method, designs the unbalance measurement system, including the choice of measuring surface, hardware design and software programming of the test system. It describes the influence of the roundness of the rotating shaft in the unbalance test, and tests the roundness of the shaft, gives the accurate data. Second, it analyzes the problem of moment fluctuation of Brushless DC motor, determines the relationship between the electromagnetic fluctuation torque and the pole number and the speed of the system. As a result, the periodic signal of the fluctuation torque of the system is related to the speed of the system.For the period interference torque, this paper puts forward the necessity of application of repetitive control theory, introduces the structure of the repetitive control system, analyzes its performance index, gives the design method of repetitive controller. Modeling and Simulation of complex platform precision centrifuge is given, and on the basis of designing the classical controller, a repetitive controller is designed. The suppression effect of the periodic interference signal is given through the simulation of continuous and discrete domains. For the problem of the time delay of the discrete internal model can not delay fractional period, a repetitive controller of digital low-pass filter based on linear interpolation is proposed. And the simulation verifies its control effect.The key issues of the control and implementation of the composite centrifuge system are studied and the design and research work is carried out, including the design of embedded digital controller composing of DSP and FPGA, and its hardware debug, software writing work, D/A circuit board debug, and the circuit design and debugging of the grating angle measuring system, DSP controller programming and PC man-machine interface programming. The closed-loop control of precision centrifuge is realized. And after debugging it reached a certain performance index requirements, established the engineering foundation for realizing the whole operation of the structure of vibrator composite centrifuge.