Modeling, Analysis and strategic study of Active dynamic control of complex mechanical system
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Date
2015
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Sam Higginbottom Institute of Agriculture, Technology & Sciences (SHIATS)
Abstract
In the past decade, lot of interest has been generated in area of intelligent system and structures because of their enormous possibility in vibration and acoustic control, shape control and health monitoring. A smart structure involved described actuator and sensors and one or more microprocessors. The responses from the sensors are analyzed by the microprocessors. Distributed parameter control theory is used to command the actuator to apply localized strains on the base structure with a view to minimize system response. Optimizing the effectiveness and reliability of integrated induced strain actuators requires an understanding of the mechanics of the mechanical interaction between the actuators and the host structures. Optimization in the vibration of automobile and structure with variable boundary condition is done by active vibration control through piezo electric patches. In this paper modelling, analysis and active vibration control of mechanical portal frame on which six piezoelectric patches are bonded in the beam as sensor/actuator. The piezoelectric patches are use to control such structures. The control may be P, PI and PID. However the paper addresses PID control because of its robustness. For computer experimentation a typical structure of portal frame is used to implement PID control. The structure is modelled using finite element method and solved for Eigen values. The piezo patches are fixed on different locations of the structure and PID controller is implemented to obtain the control response on the MATLAB platform of the Simulink toolbox. For modeling complex portal frame, numerical methods such as finite element method (FEM) are widely used. However commercially available FEM software such as ANSYS has the modelling capability to model a smart portal frame. The results are obtained and optimum location is found for the effective control of the structure. The control response obtained for the frame structure is optimized which be used for the controlling the vibration of mechanical equipment’s. There is a need to develop a methodology so that commercially available frame elements may be used to analyze the deformation pattern and dynamic behavior of smart structure.
Description
Thesis titled “Modeling, Analysis and strategic study of Active dynamic control of complex mechanical system” submitted in partial fulfillment of the requirements for the award of the degree of Doctor of Philosophy in Mechanical Engineering by Prabha Kumar Sinha.