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Recursive Fixed Memory Accessorial Variable Method And Simulation Research Networked Control Systems Based On ZigBee Protocol Stack

Posted on:2010-03-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y D HuFull Text:PDF
GTID:2178360275478138Subject:Control theory and control engineering
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Recursive Fixed Memory Accessorial Variable Method and Simulation ResearchThe Least Squares method is the most fundamental method of system identification.It is simple and practicable,and its recursive algorithm converging and reliable,while equation error is white noise the estimation results is unbiased, consistent and effective.So it is used very extensively.When identified model noise is complicated noise model,the least squares method estimated results is not unbiased or consistently.The recursive algorithm appears saturated phenomenon of data followed by data increasing,which causes it losing amendatory ability slowly. Recursive Accessorial Variable method(RAV) resolves the problem that estimated results is unbiased and consistent when noise is coloring and noise model is uncertain,but leaves the data saturated phenomenon.In the paper,the Recursive Accessorial Variable method is combined with fixed memory length,so the Recursive Fixed Memory Accessorial Variable(RFMAV) method is obtained.It resolves the problem that saturated phenomenon of data.Simulated result has indicated algorithmic validity of RFMAV.Networked Control Systems Based on ZigBee Protocol StackTraditional closed-loop control system made up of controller,actuator and transmitter communicate through cable to achieve the use of the standard current signal.It has the existence of economic,security,reliability and so on.This part of the paper put forward the closed-loop control system design program based on ZigBee wireless networking technology,which connect the controller,actuators and the transmitter of closed-loop control system to achieve the resource sharing and coordinate operations of network nodes. It is a full-distributed,network-based real-time feedback system,and simplifying the operating environment of the industrial field,reducing the system economic and maintenance costs.For the network,Networked Control Systems designs the hardware circuit and RF module of each node in the network,transplants the ZigBee protocol stack, and realizes the network communication between each node.In order to ensure network packet transmission accuracy,network control system is designed reliable application-layer program.
Keywords/Search Tags:parameter identification, fixed memory, accessorial variable method, recursive algorithm, closed loop control system, networked control systems, ZigBee
PDF Full Text Request
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