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http://dx.doi.org/10.9766/KIMST.2021.24.5.545

FxLMS Algorithm for Active Vibration Control of Structure By Using Inertial Damper with Displacement Constraint  

Kang, Min Sig (Department of Mechanical Engineering, Gachon University)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.24, no.5, 2021 , pp. 545-557 More about this Journal
Abstract
Engine is the main source of vibration that generates unwanted noise and vibration of vehicle chassis. Especially, in submarine applications, radiation of noise signatures can be detected at some distance away from the submarine using a sonar array. Thus quiet operation is crucial for submarine's survivability. This study addresses reduction of the force transmissibility originating from engines and transmitted to hull through engine mounts. An inertial damper, as an actuator of hybrid mount system, is addressed to reduce even further the level of vibration. Narrow band FxLMS algorithms are broadly used to cancel the vibration of engine mount because of its excellent performance of canceling narrow band noise. However, in real active dampers, the maximum displacement of damper mass is kinematically restricted. When the control input signal from the FxLMS algorithm exceeds this limitation, the damper mass will collide with the mechanical stops and results in many problems. Originated from these, a modified narrow band FxLMS algorithm based on the equalizer technique with the maximum allowable displacement of active damper mass is proposed in this study. Some simulation results showed that the propose algorithm is effective to suppress vibration of engine mount while ensuring given displacement constraint.
Keywords
Engine Vibration; Submarine; Active Mount; Inertial Damper; Narrow Band FxLMS; Displacement Constraint; Equalizer;
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