| The high angle of attack equipment in wind tunnel is the key equipment to analyzethe aerodynamic characteristics of fighter aircraft at high angle of attack (AOA), whichis used to imitate the flying attitude of fighter aircraft. The airplane model of the hugehigh angle attack equipment is usually driven synchronously by two hydraulic motorsystems. The two motor synchro-driven systems has the following advantages ofreducing the size and weight of equipments, as well as improving its stiffness andnatural frequency, as a result of which the overall performance of the equipment can beimproved. For the reason of the hydraulic system having nonlinear and time-varyingcharacteristics, this thesis designed the fuzzy controllers in the synchronous subchanneland error compensation channel respectively by cross-coupling synchronization schemeto improve the synchronization accuracy.The paper set up the mathematical model of the two motor synchro-driven systems,considering the stiffness of the frame. And then this paper simplifies the coupling modelin order to analyze the system simply. The frequency-domain indices of the single motorsystem was analyzed and revised preliminarily, which lay the foundation forsynchronous control.For the purpose of preparing for system simulation, the paper studies the cause ofsynchronous error as well as corresponding solutions. On the basis of analyzing severalcommon synchronization schemes, this paper proposes a kind of cross-couplingsynchronization scheme and verifies its rationality.Comparing error compensation effect between single factor, double factors, theadjusting factor method as well as Fuzzy-PI control, improved Fuzzy-PI control, theimproved Fuzzy-PI adjusting factory method is set as the error compensation controller;and then this paper designs a Fuzzy-PID controller as the synchronization Subchannelcontroller; Via of simulation, the paper compares synchronous effect of cross couplingscheme under the following four situation: the traditional controller calibrating andcompensating, fuzzy PID correcting, fuzzy error compensating, double fuzzy controllercalibrating and compensating. The results prove that fuzzy controller can reduce thesynchronous error caused by time-varying parameters and external disturbance torquebetter and has high robustness and synchronization accuracy. Of the above four situation,double fuzzy controller has the highest synchronization accuracy.Based on XPC Target and rapid prototyping technology, the author built controlsoftware platform of double cylinder synchronous motion, and experiment on a series ofcontroller strategy adopted by this paper. The result proves further the correction ofsimulation conclusion and verified the validity of synchronous control strategy adopted by this paper. |
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