Electromagnetic Actuator and Stacked Piezoelectric Sensors for Controlling Vibrations of a Motor on a Flexible Structure
TL;DR: In this paper, an actuator with a sensor for controlling vibrations of machines is presented, which consists of a voice coil-type electromagnetic actuator connected to a piezoelectric sensor and a coil spring.
About: This article is published in Journal of Sound and Vibration.The article was published on 2000-03-23. It has received 10 citations till now. The article focuses on the topics: Plant & Actuator.
Citations
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TL;DR: In this article, four actuation concepts for active suppression of gearbox mesh frequency vibrations due to transmission error excitation from the gear pair system are modelled and compared by computing the required actuation forces and amplifier power spectra.
59 citations
01 Jan 1991
TL;DR: In this paper, a second-order acceleration feedback controller that acts as an active vibration absorber is proposed to provide guaranteed stability margins for collocated accelerometer/actuator pairs in the absence of accelerometer and actuator dynamics and computational time delay.
Abstract: The development of control technology for large flexible structures must include practical demonstrations to aid in the understanding of controlled structures in space. To support this effort, a testbed facility has been developed to study practical implementation of new control technologies. The paper discusses the design of a second-order acceleration feedback controller that acts as an active vibration absorber. This controller provides guaranteed stability margins for collocated accelerometer/actuator pairs in the absence of accelerometer/actuator dynamics and computational time delay. Experimental results in the presence of these factors are presented and discussed. The primary performance objective considered is damping augmentation of the first nine structural modes. Comparison of experimental and predicted closed-loop damping is presented, including test and simulated-time histories for open- and closed-loop cases. Although the simulation and test results are not in full agreement, robustness of this design under model uncertainty is demonstrated. The basic advantage of this second-order controller design is that the stability of the controller is model-independent for collocated accelerometers and actuators.
34 citations
TL;DR: In this paper, a hybrid vibration absorber (HVA) is proposed to suppress stationary random vibration in flexible structures using a special pole-placement controller, such that all vibration modes of the flexible structures become critically damped.
28 citations
Cites background from "Electromagnetic Actuator and Stacke..."
...Keywords: Global vibration control, Vibration absorber, Hybrid control, Active damping...
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TL;DR: In this article, a bibliography is given containing 1224 references published during 1999 and 2000 on piezoelectric and pyroelectric properties of materials and their applications, including journal articles and some conference proceedings.
Abstract: A bibliography is given containing 1224 references published during 1999 and 2000 on piezoelectric and pyroelectric properties of materials and their applications. It includes journal articles and some conference proceedings. Complete bibliographic citations and additional information such as language and original sources of translations are given. This bibliography is the continuation of a series published semi-annually.
12 citations
10 Jul 2002
TL;DR: In this article, four actuation concepts for active suppression of gearbox mesh frequency vibrations caused by transmission error excitation from the gear pair system are modeled and compared by computing the required actuation force and amplifier power spectra.
Abstract: Four actuation concepts for the active suppression of gearbox housing mesh frequency vibrations caused by transmission error excitation from the gear pair system are modeled and compared by computing the required actuation force and amplifier power spectra. The proposed designs studied consist of (i) active inertial actuators positioned tangentially on the gear body to produce a pair of reactive force and moment, (ii) semi-active gear-shaft torsional coupling to provide tuned vibration isolation and suppression, (iii) active bearing vibration control to reduce vibration transmissibility, and (iv) active shaft transverse vibration control to suppress/tune gearbox casing or shaft response. Numerical simulations that incorporate a transmission error term as the primary excitation are performed using a finite element model of the geared rotor system (dynamic plant) constructed from beam and lumped mass/stiffness elements. Several key comparison criteria, including the required actuation effort, control robustness and implementation cost, are examined, and the advantages and disadvantages of each concept are discussed. Based on the simulated data, the active shaft transverse vibration scheme is identified as the most suitable approach for this application.
8 citations
References
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TL;DR: In this paper, a semiactive hydraulic bridge vibration absorber that can be retrofitted to an existing bridge is described, and a practical feedback control that uses either strain-gauge or accelerometer readings to sense the state of the system is synthesized.
Abstract: Heavy truck traffic on highway bridges is known to produce impact loads that cause large vibrations. This phenomenon can reduce the expected service life of many highway bridges. A means to mitigating those deleterious vibrations using an automatic control system that requires no pumps or line power is proposed. A semiactive hydraulic bridge vibration absorber that can be retrofitted to an existing bridge is described. The bridge/vehicle system is modeled, and a practical feedback control that uses either strain-gauge or accelerometer readings to sense the state of the system is synthesized. The results of an experimental test of the new system indicates reductions of peak amplitudes of 65–70%.
91 citations
TL;DR: The Delayed Resonator as mentioned in this paper is a tunable active vibration absorber that completely removes oscillations from the primary structure, and it can be tuned in real time using a control which has a time delayed feedback of the absorber mass displacement.
Abstract: This paper elaborates upon a novel concept, the Delayed Resonator, a tunable active vibration absorber. This technique uses a control which has a time delayed feedback of the absorber mass displacement. The substance of this process is in that the absorber completely removes oscillations from the primary structure. Two very strong features that should be mentioned are : (a) the excitation frequency range can vary over a semi-infinite interval, and (b) the absorber can be tuned in real time. These are the unique characteristics of the technique distinguishing it from the others. Stability issues of the primary system combined with the Delayed Resonator are addressed following Nyquist and root locus methods. In particular, the absorption performance for cases with time varying excitation frequency is studied. The primary focus of this paper is on the analysis of transient absorption behavior of the Delayed Resonator during its tuning. An example case is provided which considers a step change in the excitation frequency. A well-pronounced manifestation of the tunability feature of the Delayed Resonator is observed. The superiority of the Delayed Resonator absorber over the conventional a priori tuned absorbers is also demonstrated.
63 citations
TL;DR: In this article, 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 in the Mexico City 1985 earthquake excitation records.
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.
54 citations
53 citations
TL;DR: In this paper, active control of flexural waves on a slender beam is discussed for a secondary source array which comprises either point forces or pairs of moments generated by piezoelectric actuators.
40 citations