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.

Active vibration control of piezoelectric laminated beams with electroded actuators and sensors using an efficient finite element involving an electric node

Abstract: This paper presents an efficient finite element (FE) model for the active vibration control response of smart laminated beams integrated with electroded piezoelectric sensors and actuators. The FE model is based on an efficient layerwise theory with a quadratic variation of electric potential across the piezoelectric layers. The beam element has two conventional nodes and one electric node, which has no physical coordinate. The electric potential degrees of freedom (DOF) at the electroded piezoelectric surfaces are attached to the electric node which is connected to multiple elements belonging to the same electroded surface. This models the equipotential surface of the electroded sensors and actuators conveniently, and eliminates the cumbersome task of averaging the electric DOF over the surface. The control system is designed using a reduced-order modal state space model. The constant gain velocity feedback (CGVF) and optimal control strategies are studied for smart composite and sandwich beams with single-input–single-output (SISO) and multi-input–multi-output (MIMO) configurations under step and impulse excitations. The numerical study for CGVF control is performed on cantilever smart beams with both conventionally and 'truly' collocated actuators and sensors. The reasons for experimentally observed instability in CGVF control with conventional collocated sensors and actuators is explained. The effect of multiple segmentation of electrodes on the control performance is investigated.

INTEGRATED PASSIVE/AcTIVE VIBRATION ABSORBER FOR MULTISTORY BUILDINGS

Abstract: In this paper, a passive isolator, an active vibration absorber, and an integrated passive/active (hybrid) control are studied for their effectiveness in reducing structural vibration under seismic excitations. For the passive isolator, a laminated rubber bearing base isolator, which has been studied and used extensively by researchers and seismic designers, is studied. An active vibration absorber concept, which can provide guaranteed closed-loop stability with minimum knowledge of the controlled system, is used to reduce the passive isolator displacement and to suppress vibration. A three-story building model is used for the numerical simulation. The performance of an active vibration absorber and a hybrid vibration controller in reducing peak structural responses is compared with the passively isolated structural response under the N00W component of the El Centro 1940 and N90W component of the Mexico City 1985 earthquake excitation records.

Active Vibration Control of Intelligent Composite Laminate Structures Incorporating an Electro-Rheological Fluid:

Abstract: This paper addresses an active vibration control of intelligent composite laminate structures containing an electro-rheological (ER) fluid. Firstly, complex shear modulus of the ER fluid itself is obtained as a function of imposed electric fields and excitation frequencies through a rotary oscillation test. By incorporating the measured complex modulus with a conventional sand wich beam theory, elastodynamic properties of the structures are then predicted. Subsequently, an experimental investigation is undertaken in order to identify modal characteristics such as damped natural frequencies, damping ratios, and mode shapes of the structures. As for the validation of the modeling methodology, the comparison between the predicted elastodynamic properties and the measured ones is performed. Characteristics of the ER fluid actuator explicitly representing the relationship between elastodynamic properties and imposed electric fields are also inferred. A control system model is then formulated by combining the a...

Driving circuit for vibration wave motor

Abstract: A driving circuit for a vibration wave motor, in which a periodic voltage is supplied to electromechanical energy converting elements generates a travelling vibration wave in a vibrating member, thus causing a relative movement between the vibrating member and a movable member. For achieving effective operation of the vibration wave motor, the driving circuit controls the amplitude of the periodic voltage supplied to the electromechanical converting elements according to the drive state of the vibration wave motor.