Construction Of Experimental Platform And Verification Of Stabilization For Networked Control System

There are three aspects of the research on the network control system:control of network?control through network?integrated control and network.In this book,we will mainly focus on the design of the controller which belongs to the category of the control through network so that we can obtain the stability region in the hyper-sampling mode.The main contents of this research are organized as follows:We propose a new idea that design the feedback controller gain matrix by analyzing the asymptotic behavior of the critical eigenvalues.The main reason for this problem is we can't get the analytic solution of the status transfer matrix in the hyper-sampling mode.In other words,we can't get the stability region of the system by analytical method.By analyzing the asymptotic behavior of the critical eigenvalues which on the unit circle,we can know the movement trend of the characteristic root,and then we should adjust the elements of the feedback gain matrix according to the movement trend of the characteristic root so that the root loci can converges to the unit circle.At the same time,we can not only obtain a new feedback gain matrix but also obtain the new asymptotic stability condition.The stability region of the networked control system can be obtained by apply the above step in an iterative manner.An experimental platform of DAQ based on Lab VIEW is built to verify the theory proposed above.The application object of the theoretical research in this paper is a DAQ system which consists a direct current(DC)brushed motor,a data acquisition(DAQ)card and a photoelectric encoder.In order to complete the verification of the theory,we will regard the theoretical value as the transmission signal and have a control on the experimental platform.In addition.the problem of the selection of the sub sampling periodic and data synchronization can be solved in the in the LabVIEW program when designing the software which applied on the platform.Combined with the theoretical calculation results and the different dynamic performances of the DC speed motor,we achieve the goal of solving the stability region of the network control system in the hyper-sampling mode.