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Title: Multi-Mode Vibration Control of Plates Using Single Actuator and Single Sensor
Other Titles: التحكم متعدد الأشكال في الاھتزازات باستخدام التغذیة متأخرة السرعھ في
Authors: Altaf Faisal F. Al-Snafi 
Supervisor: Dr. Majed Majeed
Keywords: Mechanical Engineering Multi-Mode Vibration Control Plates Single Actuator Single Sensor
Issue Date: 2015
Publisher:  Kuwait university - college of graduate studies
Abstract: Multi-mode vibration control is one of the most difficult control schemes. Most researchers use multi-actuators and multi-controllers to control multi-mode vibration in structures. The use of a single actuator to control multi-mode vibration is rare due to its difficulties. In the present work, a multi-mode model that consists of a single actuator and a single sensor attached at the top of a simply-supported thin plate is developed. In this study, a piezoelectric actuator is used and it is assumed to be perfectly bonded to the plate, in which the bonding thickness is neglected. The sensor is an accelerometer, and its signal is integrated and filtered to include only the first and the second modes. The linear equations of motion of the simply-supported plate are derived and discretized using Galerkin’s Method. The resulting coupled equations are combined with a velocity delay feedback controller to simulate the reduction of structural vibrations. Although this method is applied on a plate, the proposed technique can be implemented on any multi-mode structure. In this study, a single actuator and a single sensor are used to apply a multi-mode velocity delay feedback control scheme. The actuator is assumed to be of a fix size while the location and orientation can be optimized. The sensor location can be changed to enhance the performance of the controller. For the delay controller, the delay duration and the amplification gain are altered to control the structure. In order to find the optimum controller values of this multi-variable problem, a Genetic Algorithm (GA) is used. The root mean square of the input signal is used as an objective function in the GA scheme. To get the optimum solution and to show the effect of optimization on the delay feedback controllers, several steps are used in the GA method. It begins with two physical variables, and it continues to seven. It is shown that the number of variables included in the GA technique enhances the controller performance. In fact, the performance is enhanced by 46% compared to the two variable case. The results show that the use of single input single output (SISO) delay feedback multi-mode controller can be implemented on any structure.
Appears in Programs:0630 Mechanical Engineering

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