Research On MIMO Sine On Random Vibration Control System

With increasing demands for product reliability, one technology called vibration test has been widely used in this filed. Some unknown problems can also be found during the product testing. At Present, a variety of broad-band random and sine vibration control system has been developed and widely used in many kinds of fileds. However, it is so little study about multiple inputs multiple outputs sin on random vibration control system. For the complexity of the MIMO sin on random virbration control system, we use the pure broad-band random or sin vribration control system instead previously. The control system in this paper is designed to simulate physical environment more factually.As we known, when testing the large scale specimen, the single-point sin on vibration control system can not supply the enough force. The specimen can not been incentived uniformly. To solve these problems, an in-depth study of the vibration control system about multiple inputs multiple outputs sin on random has been done in this paper. The framework of the testing system has been completed.First, the current development of the vibration environment test is reviewed. Many problems in this field are discussed.Second, the basic virbration control theories are given at the beginning of the paper. A control scheme with cross-coupling compensator about the MIMO sinusoidal vibration control system is put forwarda to solve the coupling between the multi-input multi-input signals.In this control system, signals are controlled in two steps. When random signal is controlled, the sin sigal is added in the time domain. One technical difficulty is that to isolate the sine and random singals from the mixed singals correctly. We use one method called correlation integral to isolate the signal.In this way, we can get the amplitude of the sin wave to complete the closed-loop control.Third, a beam is created in the simulate enviorment. A numerical simulation of control algorithm has been done. The results are compared in the literature to ensure the control algorithm and also make prepare for the next.Finally, a uniform steel beam is chosen and the test platform is built for the test. Control program is written by LabVIEW. Data acquisition and transmission are executed by PXI. The results show that the algorithm can achieve the desired objectives.