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: The authors design the active vibration control and disturbance observers to solve the vibration problem of the flexible robotic manipulator under the external disturbances, namely, to reduce the shear deformation and the deflection of the flexibility Timoshenko link.
Abstract: The authors investigate the dynamic modelling problem and the active vibration control design problem for a flexible Timoshenko robotic manipulator in this study. For the practical robotic manipulator, the authors analyse the dynamic characteristic considering the shear deformation and elastic deflection of the flexible arm link and describe this flexible system with a coupled partial differential equation and ordinary differential equations (PDE–ODEs) model. Furthermore, the authors design the active vibration control and disturbance observers to solve the vibration problem of the flexible robotic manipulator under the external disturbances, namely, to reduce the shear deformation and the deflection of the flexible Timoshenko link. Besides, the manipulator is driven to track the given angular position with an active angular controller, simultaneously. The effectiveness of the designed vibration control laws is analysed by the theoretical analysis and verified by the numerical simulation.
29 citations
TL;DR: In this article, the authors describe experiments in which combined state and parameter estimation is used to determine viscous and Coulomb friction terms associated with a prototype electro-rheological (ER) vibration damper.
29 citations
TL;DR: In this paper, an active vibration control of a cylindrical shell using piezoelectric disks is studied both theoretically and experimentally in the presence of an adaptive feedforward controller based on steepest descent method.
Abstract: Active vibration control of a cylindrical shell using piezoelectric disks is studied both theoretically and experimentally in this paper. Hamilton’s principle is used for deriving dynamic motion equations of the cylinder coupled with piezoelectric disks. The equations are discretised by Rayleigh-Ritz method. An adaptive feedforward controller based on steepest descent method is implemented on a PC to control the modal vibration. The proposed method solves the drawback of using PCs that is sending and receiving data in block form. It is shown that the proposed control system which consists of piezoelectric disks and an adaptive controller is effective in reducing vibration and radiated acoustic noise.
29 citations
TL;DR: In this paper, the active vibration control and configurational optimization of a cylindrical shell are analyzed by using piezoelectric transducers, and the optimization procedure is designed based on desired controllability and observability of each contributed and undesired mode, in order to limit spillover effects, the residual modes are taken into consideration.
29 citations
Patent•
27 Feb 1990TL;DR: In this paper, the elastic member vibrates, being excited by the first electromechanical transducing element, and the impedance element is adjusted so that the vibration frequency and the resonance frequency should be almost the same.
Abstract: In the piezoelectric transducer, the elastic member vibrates, being excited by the first electromechanical transducing element. The impedance element on the second electromechanical transducing element is adjusted so that the vibration frequency and the resonance frequency of the elastic member should be almost the same. In the ultrasonic motor using the piezoelectric transducer, the vibration having the same frequency as that of the vibration of the elastic member is applied to the elastic member. This applied vibration has a direction differnt from that of the viration of the elastic member. The applied vibration and the vibration of the elastic member form approximate elliptical vibration, thereby rotating the rotor. The piezoelectric transducer of variable structure can control the resonance frequency in a wide range without electric power. The piezoelectric transducer can efficiently transduce applied electricity into approximate elliptical vibration of the elastic member, thereby generating great mechanical drive power. The electromechanical transducing element and the impedance element can compose a simple and compact vibration control unit. Since the electromechanical transcuding element and the impedance element form a closed circuit consuming no electric power, no power source circuit is required. The vibration control unit adjusts the resonance characteristic of the closed circuit, thus quantitatively controlling the frequency distribution and the amplitude of the mechanical vibration.
29 citations