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 article, a module-type three-degree-of-freedom vibration isolation system using modified zero-power control is proposed, which consists of a common base, an individual middle mass and a common isolation table.
34 citations
TL;DR: In this article, a moving-coil-type actuator is used as a two-port sensing and driving device for active vibration control, and four velocity identification algorithms are tested and their capability of reducing structural vibrations is compared.
Abstract: Active vibration control requires a velocity signal which is fed back to the force actuator to produce the damping force to the structure. Usually a gap sensor is used to detect the displacement and a differentiator is needed to produce the velocity signal. Moreover, it is very difficult to install the sensor at the same position of the actuator. Setting the gap sensor close to the magnetic actuator may cause an undesirable interaction between them. Sometimes there is no space for installing the sensor. This paper introduces a method of using a moving-coil-type actuator as a two-port sensing and driving device. Four types of velocity identification algorithms are tested and their capability of reducing structural vibrations is compared.
34 citations
TL;DR: In this article, a combined approach based on a conventional tuned mass absorber, but whose characteristics can be strongly influenced by applying shunted piezoceramics, is presented.
Abstract: In order to reduce structural vibrations in narrow frequency bands, tuned mass absorbers can be an appropriate measure. A quite similar approach which makes use of applied piezoelectric elements, instead of additional oscillating masses, are the well-known resonant shunts, consisting of resistances, inductances, and possibly negative capacitances connected to the piezoelectric element. This paper presents a combined approach, which is based on a conventional tuned mass absorber, but whose characteristics can be strongly influenced by applying shunted piezoceramics. Simulations and experimental analyses are shown to be very effective in predicting the behavior of such electromechanical systems. The vibration level of the absorber can be strongly attenuated by applying different combinations of resistant, resonant, and negative capacitance shunt circuits. The damping characteristics of the absorber can be changed by applying a purely resistive or resonant resistant shunt. Additionally, the tuning frequency of the absorber can be adapted to the excitation frequency, using a negative capacitance shunt circuit, which requires only the energy to supply the electric components.
34 citations
TL;DR: In this paper, an active vibration control system is designed to suppress the undesirable chaotic vibration in a constrained flexible pipe conveying fluid, which exhibits regions of flutter and chaotic motions at sufficiently high flow velocity.
34 citations
TL;DR: In this paper, a distributed piezoelectric sensor and actuator have been designed for the efficient vibration control of a plate, where the actuator design is based on the criterion of minimizing the system energy in the control modes under a given initial condition.
Abstract: A distributed piezoelectric sensor and actuator have been designed for the efficient vibration control of a plate. Optimization of the electrode pattern of polyvinylidene fluoride (PVDF) film has been performed to realize the concept of modal transducer for a two-dimensional structure. The finite element method is used to model the structure that includes the PVDF sensor and actuator. Various lamination angles of transducers are taken into consideration to utilize the anisotropy of the PVDF film, The electrode pattern over the entire surface of the plate is determined by deciding on or off of each electrode segment. The actuator design is based on the criterion of minimizing the system energy in the control modes under a given initial condition. The sensor is designed to minimize the observation spillover, Modal control forces for the residual (uncontrolled) modes have been minimized during the sensor design. A genetic algorithm, which is suitable for this kind of discrete problem, has been utilized for optimization. A discrete linear quadratic Gaussian control law has been applied to the integrated structure for real-time vibration control. The performance of the sensor, the actuator, and the integrated smart structure has been demonstrated by experiments.
34 citations