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.

Electromagnetic and mechanical characterizations of noise and vibration in permanent magnet synchronous machines

Abstract: The effect of electromagnetic and mechanical characteristics in permanent magnet (PM) synchronous machines on noise and vibration is presented. Some mechanisms of electromagnetic and mechanical interaction of the machine resulting in noise and vibration are analyzed and calculated. Computational and experimental results are also compared. Noise and vibration resulting from electromagnetic forces dominates in the noise and vibration of PM electrical machine on rated load. When the exerting force frequencies coincide with modal frequencies of the stator, the motor can generate high noise and vibration peak

Active vibration control of composite sandwich beams with piezoelectric extension-bending and shear actuators

Abstract: We have used quasi-static equations of piezoelectricity to derive a finite element formulation capable of modelling two different kinds of piezoelastically induced actuation in an adaptive composite sandwich beam. This formulation is made to couple certain piezoelectric constants to a transverse electric field to develop extension-bending actuation and shear-induced actuation. As an illustration, we present a sandwich model of three sublaminates: face/core/face. We develop a control scheme based on the linear quadratic regulator/independent modal space control (LQR/IMSC) method and use this to estimate the active stiffness and the active damping introduced by shear and extension-bending actuators. To assess the performance of each type of actuator, a dynamic response study is carried out in the modal domain. We observe that the shear actuator is more efficient in actively controlling the vibration than the extension-bending actuator for the same control effort.

An experimental study of active vibration control of composite structures with a piezo-ceramic actuator and a piezo-film sensor

Abstract: In order to reduce the vibrational level of lightweight composite structures, active vibration control methods have been applied both numerically and experimentally. Using the classical laminated beam theory and Ritz method, an analytical model of the laminated composite beam with piezoelectric sensors and actuators has been developed. Smart composite beams and plates with surface-bonded piezoelectric sensors and actuators were manufactured and tested. It is found that the developed analytical model predicts the dynamic characteristics of smart composite plates very well. Utilizing a linear quadratic Gaussian (LQG) control algorithm as well as well known classical control methods, a feedback control system was designed and implemented. A personal computer (PC) was used as a controller with an analogue - digital conversion card. For a cantilevered beam the first and second bending modes are successfully controlled, and for cantilevered plates the simultaneous control of the bending and twisting modes gives a significant reduction in the vibration level. LQG has shown advantages in robustness to noise and control efficiency compared with classical control methods. In this study examples of control spillover are demonstrated via the instantaneous power spectrum of the sensor output.

Design and implementation of tuned viscoelastic dampers for vibration control in milling

Abstract: Passive means of vibration attenuation have been employed successfully and efficiently in machining systems such as turning and milling. Traditional approach to controlling vibration in a milling s ...