Abstract
Research on Active Vibration Control System (AVCS) is being carried out to reduce structural vibration s caused by unwanted vibrations in many application a reas such as in space, aircraft structures, satelli tes, automobiles and civil structures (bridges), particu larly at low frequencies. The unwanted vibration ma y cause damage to the structure or degradation to the structure’s performance. The AVCS comprises physical plant, a sensor to detect the source vibration, a D SP based electronic controller using an actuator co nnected to the structure generates a counter force that is appropriately out of phase but equal in amplitude t o the source vibration. As a result two equal and opposit e forces cancel each other by the principle of supe r position and structure stops vibrating. The main ob jective of this research work is to develop an embe dded computer based real time AVCS for reducing low frequency tonal vibration response of a vibrating flexi ble cantilever beam by automatic modification of the vi brating beam’s structural response and to verify th e performance of the developed system experimentally. The developed AVCS is a generic design platform that can be applied for designing adaptive feed for ward AVC and feedback AVC. This study presents the vibration control methodology adapted for reducing tonal vibration generated by a sine generator conne cted to the primary source actuator attached to one end of the cantilever beam. The secondary actuator is attached to the beam on the other end through the A VCS to reduce primary vibration by destructive interference with the original response of the syst em, caused by the primary source of vibration. Adap tive feed forward Active Vibration Control (AVC) technique is used with Filtered-X Least Mean Square (FxLMS) algorithm using FIR digital filter. A canti lever beam was considered as plant and embedded computer based AVCS was tested and evaluated using an experimental setup. The experimental results are presented for the cantilever beam excited at one of its natural frequency using active vibration contr ol system and an appreciable reduction was achieved up to 20 dB.
Highlights
Research on Active Vibration Control (AVC) is being carried out in reducing unwanted vibrations of flexible structures as the unwanted vibrations have detrimental effect in many real life applications
This study presents the vibration control methodology adapted for reducing tonal vibration generated by a sine generator connected to the primary source actuator attached to one end of the cantilever beam
The cantilever beam is vibrating with a sinusoidal vibration at a frequency of 153Hz is chosen as the excitation source signal since it is one of the dominant natural frequencies of the beam
Summary
Research on Active Vibration Control (AVC) is being carried out in reducing unwanted vibrations of flexible structures as the unwanted vibrations have detrimental effect in many real life applications. Active vibration control is a promising technique to increase the performance of those lightly damped flexible structures with light-weight design, where sometimes attenuation of the vibrations by passive treatments is not sufficient or even impossible, i.e., large space structures, high precision machines. The various possible applications of active vibration control are increased material durability and fatigue life, lower operating costs due to reduced facility down-time for installation and maintenance and reduced operator fatigue and improved ergonomics. These advantages received new emphasis in the last few years. The compact size and modularity of active systems can provide additional flexibility in product design, even to the point of a complete product redesign
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