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|Title:||INVESTIGATION OF ACTIVE VIBRATION CONTROL OF SMART SHELL STRUCTURE|
|Authors:||Shravan, Jadhav Vishal|
|Keywords:||MECHANICAL INDUSTRIAL ENGINEERING;ACTIVE VIBRATION CONTROL;SMART SHELL STRUCTURE;SMART MATERIALS|
|Abstract:||Recent advances in materials science have led to the development of a range of functional materials which when embedded into a structure can produce and monitor structural deformations. These structures have been labeled `smart structures' and such materials are known as `smart materials'. Smart materials have the ability to change shape or size dramatically thus have the capability to `feel' a stimulus and suitably react to it just like any living organism. Each individual type of smart material has a different property which can be significantly altered, such as viscosity, volume, and conductivity. The property that can be significantly altered influences the likely applications of the smart material. In the recent years, the field of smart structures and its control has come up as an emerging area of research especially in aerospace industry. This work deals with the experimental and numerical assessment of the vibration suppression of smart structures using piezoelectric materials. These materials are usually thin wafers, which are poled in the thickness direction and bonded to the surfaces of the host structures. Piezoelectric material such as PZT patch (Piezoceramic patch) is equally effective as sensor and. actuator. PZT patch is useful in vibration control because of advantages of high stiffness, light weight, low power consumption and easy implementation. A cantilevered semi-circular shell with piezoelectric material patches (PZT) is modeled using finite element method. PZT patches_ are considered to be bonded on the top and bottom surfaces of the shell. These patches act as sensors and actuators. In the finite element model of the shell and PZT have been modeled using same element and the effect of mass and stiffness of PZT has been included in the analysis. Different strategies such as proportional and negative velocity feedback control have been implemented under different loading conditions. In both control strategies the feedback voltage has been generated as functions of position quantities (the rotation of extremities of sensor). The sensed voltage is multiplied by the proper gain to obtain the feedback voltage. This feedback voltage is supplied to the actuator to obtain control action. Proportional control method uses the difference of the position quantities (rotation) between the nodes considered and in the negative velocity feedback control the negative of the rate of change of position quantities is used. PZT has been used as both the sensor and the actuator in a closed loop vi algorithm to actively control the dynamic response of a structure. The control actions of the two control strategies have been compared.|
|Research Supervisor/ Guide:||Jain, S. C.|
Mishra, B. K.
|Appears in Collections:||MASTERS' DISSERTATIONS (MIED)|
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