Topic
Active vibration control
About: Active vibration control is a research topic. Over the lifetime, 6770 publications have been published within this topic receiving 76599 citations. The topic is also known as: active vibration damping.
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TL;DR: In this paper, the authors proposed a new formulation for active vibration control of a rectangular plate based on the optimal positions/orientations of piezoelectric actuators/sensors attached to the plate.
Abstract: The purpose of this study is to suggest a new formulation for active vibration control of a rectangular plate based on the optimal positions/orientations of piezoelectric actuators/sensors attached to the plate. The free vibration and modal properties are derived by using Rayleigh–Ritz and the transient response by assumed modes methods based on the classical plate theory. Three criteria are proposed for optimal location of piezoelectric patches attached to the simply supported plate. In other words, the optimal positions/orientations of piezoelectric patches can be determined based on spatial controllability/observability gramians of the structure, as well as the consideration of residual modes to reduce the spillover effect. These criteria are used to achieve the optimal fitness function defined for a genetic algorithm optimizer to find the optimal locations/orientations of piezoelectric sensors/actuators. To control the vibrations of the plate, a negative velocity feedback control algorithm is designed. The results of simulations indicate that by locating piezoelectric patches in the optimal positions, the depreciation rate of the structure increases and the amplitudes of the plate vibrations reduce effectively. The effect of number of piezoelectric devices on the active damping property of the system is also analyzed.
40 citations
01 Jan 2004
TL;DR: In this paper, a tool adaptor with built-in active vibration damping device to dynamically stabilize the turning process is presented, which can be used in standard CNC-lathes and allows the usage of off-the-shelf tool heads.
Abstract: A tool adaptor with built-in active vibration damping device to dynamically stabilize the turning process is presented in this paper. It can be used in standard CNC-lathes and allows the usage of off-the-shelf tool heads. The vibration compensation system is based on a multilayer piezoactuator that is in collocation with a piezoelectric force sensor. An analogue controller based on the integral force feedback method is used for active damping.
40 citations
20 Mar 2005
TL;DR: In this paper, the PZT patches are surface bonded near the fixed end of flexible steel cantilever beam and the dynamic model of the flexible steel beam is derived, and active vibration control methods, such as optimized parameter PID compensator, strain rate feedback control are investigated and implemented.
Abstract: Considerable attention has been devoted recently to active vibration control using intelligent materials as actuators. This paper presents results on active control schemes for vibration suppression of flexible steel cantilever beam with bonded piezoelectric actuators. The PZT patches are surface bonded near the fixed end of flexible steel cantilever beam. The dynamic model of the flexible steel cantilever beam is derived. Active vibration control methods, such as optimized parameter PID compensator, strain rate feedback control are investigated and implemented using xPC target real-time system. Experimental results demonstrate that the proposed methods achieve effective vibration suppression results of steel cantilever beam.
40 citations
TL;DR: In this article, multiple phase-shift notch filters are proposed to suppress the harmonic current in AMB rotor system to improve the closed-loop stability of flywheel and to maintain system stability.
Abstract: An active magnetic bearing (AMB) rotor system has such advantages as no friction and active vibration control. However, harmonic current caused by mass imbalance and sensor runout of magnetically suspended rotor system will lead to harmonic vibration. The harmonic current frequency is changed with the variation of rotation speed. The harmonic current suppression at variable rotation speed is a challenging research topic. In order to suppress harmonic current in AMB whose frequencies are integer multiples of the rotation frequency of rotor and to maintain system stability, multiple phase-shift notch filters are proposed in this paper. The closed-loop stability is ensured by adjusting the phase at variable rotation speed. Experiments are carried out on vibration measurement table and magnetically suspended flywheel prototype to show the effectiveness of the proposed method.
40 citations
TL;DR: In this article, the on-orbit and launch environment isolation performance of a vibration isolator using bellows and viscous fluid has been evaluated and the structural safety of the isolation system is evaluated through sine and random vibration and shock tests.
40 citations