Observer Based Controller for Magnetic Levitation System
This paper explains Magnetic Levitation system of a train which comprises of guidance track made with magnets. The main objective is to design a proper controller that can suspend and propelled the train on a guidance track made with magnets. To perform the desired task state space model of Magnetic Levitation system is derived. The response of the system is simulated in MATLAB. The open loop response showed that the derived model is unstable. Observer Based Controller (OBC) is designed to analyze the system in closed loop. The controller showed improved performance for different tracks. Different types of realization techniques (minimal realization, balanced realization, modal realization, observer canonical realization) are compared for minimum fragility in controller implementation. The difference among the different realization controllers has been analyzed in detail for rounding off error or truncation error and an optimal non fragile controller design has been presented. Different disturbances were imposed upon the simulated model. All the results are analyzed in open and closed loops. The closed loop response showed that the vehicle is suspend and propelled on the track and the desired results were achieved successfully.
Magnetic Levitation System with Interface for Position Control
This paper exposes the development of a magnetic levitation plant and interface for control the position of a suspended permanent magnet and for monitor the control signal. Its interface have a didactic purpose to allow the students to observe how the control variable of the system changes with perturbations, as well as the design of a PD controller for a linear approximation of a non-linear system. The implementation is composed of the controller circuit (OPAMP and Hall Effect sensor), the power circuit (transistor and electromagnet), and a microcontroller to communicate with the graphical interface through computer. The graphical interface was developed with the GUI editor of MATLAB. Different tests have been performed with the prototype, and they verified that the designed controller worked properly keeping the levitating object in the desired position. Keywords-Nonlinear system, Magnetic Levitation, controller design, MATLAB GUI.
ANALYSIS OF BOLT′S ANCHORING QUALITY BASED ON WAVELET NEURAL NETWORK
The dynamic response of bolt achieved by impact-echo method can be effected easily by some factors.It′s difficult to classify bolt′s anchoring quality according to the dynamic response of bolt.In this paper,a new analytical method of bolt′s dynamic response is put forward.The new analytical method combing with advantages of wavelet analysis and artificial neural network is presented.Firstly,the dynamic response of bolt by numerical simulation software FLAC3D is obtained.Secondlyt,he features are extracted from the dynamic response of bolt by wavelet analysis.Thirdlyt,hese features are fed into the artificial neural network for training.Finallyt,his artificial neural network to classify the bolt′s anchoring quality intelligent according to the dynamic response of bolt is employed.In order to validate this new analytical method,some practical signals of bolt′s dynamic response are used for the test.The results indicate that the new analytical method is practicable.