Active Wave Control of a Flexible Beam. Fundamental Characteristics of an Active-Sink System and Its Verification.

Tanaka, Nobuo; Kikushima, Yoshihiro

doi:10.1299/jsmec1988.35.236

Cited by 26 publications

(24 citation statements)

References 6 publications

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“…Among the less intrusive methods, Zhu and Zheng [6] investigated the effect of moving the boundary and varying the length of a string; Shahruz and Kurmaji [7] proposed the use of a vertical force at one support for axially moving strings; Li et al [8] investigated boundary velocity feedback to stabilize a nonlinear model obtained using Hamilton's principle; and Zhang et al [9] designed boundary controllers for a general class of string-actuator systems. Other boundary control methods in the literature include wave control [10,11], wave cancellation [12,13], and active sinks [14]. An approach to string vibration control that can be viewed as direct physical interaction or boundary control is the work by Alsahlani and Mukherjee [15], where a scabbard-like actuator is used to impose a zero-displacement constraint over some length of the string from one boundary.…”

Section: Introductionmentioning

confidence: 99%

Vibration suppression of a string through cyclic application and removal of constraints

AlSahlani

Mathis

Mukherjee

2012

Journal of Sound and Vibration

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Section: Introductionmentioning

confidence: 99%

Vibration suppression of a string through cyclic application and removal of constraints

AlSahlani

Mathis

Mukherjee

2012

Journal of Sound and Vibration

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“…This discussion suggests two novel active vibration control schemes for a distributed-parameter structure, progressive wave control [6][7][8][9] and standing wave control. 6,10 In contrast to conventional active control whereby the vibration level at sensing points is attenuated, progressive wave control reduces vibration by eliminating its source, reflected waves, and hence the standing waves these reflected waves produce.…”

Section: Introductionmentioning

confidence: 99%

“…6,10 In contrast to conventional active control whereby the vibration level at sensing points is attenuated, progressive wave control reduces vibration by eliminating its source, reflected waves, and hence the standing waves these reflected waves produce. In such a case, the entire infinity of vibration modes remain dormant.…”

Section: Introductionmentioning

confidence: 99%

Active control of a distributed-parameter structure using vortex power flow confinement

Tanaka

Kikushima

Kuroda

et al. 1997

The Journal of the Acoustical Society of America

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This paper considers the active power flow control of a distributed-parameter planar structure, with particular emphasis on a vortex power flow which has the potential to confine the vibrational power into a restricted area of the structure. Without letting the vibrational power, a cause of exciting structural modes, disperse into the structure, control of the structural response can be achieved. This paper begins by deriving the necessary condition for producing a vortex power flow in the vicinity of a disturbance point force at an arbitrary exciting frequency. Then, with a wave visualization system newly developed, it becomes possible to observe the wave propagation ͑the vortex power flow͒ taking place in the structure. In order to investigate the contribution of structural modes to the vortex power flow configuration, an energy stream function as well as a vorticity function is derived in a general form. By using these functions, the generation mechanism of a vortex power flow actively induced around a disturbance force location is quantitatively studied.

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“…This phenomenon of vibration being suppressed is referred to by the author as the progressive-wave suppression method. 5,6 The progressivewave suppression method introduces control energy into the structure to produce progressive waves over the structure.…”

Section: Introductionmentioning

confidence: 99%

“…On account of this aspect, the author refers to a control strategy that uses this idea as the standing-wave suppression method. 5,6 In an attempt to pursue the dormancy of the vibration modes of a distributed parameter structure, this paper adopts the standing-wave suppression method, which can be realized by minimizing the kinetic energy of the struc-ture as will be discussed in Sec. 3.…”

Section: Introductionmentioning

confidence: 99%

Vibrational and acoustic power flow of an actively controlled thin plate

Tanaka¹

1996

Noise Control Eng. J.

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This paper examines the characteristics of real vibrational power flow in a simply supported rectangular panel under the action of feedforward vibration control, induced by a control source input which is slightly sub-optimal such that the primary source is producing a slight amount of real vibrational power, and the control source is absorbing the same amount. It is found that the path of the power flow is a combination of translations and rotations, the rotations being induced by the interference of two modes which produces a ''vortex generating block.'' A qualitative formula for predicting the number of power flow vortices, as well as the discussion of the vortex period, is presented. Then, a quantitative formula for expressing the power flow vortices is discussed from the viewpoint of a stream function. A novel method to induce a vortex at an arbitrary location in the plate is also shown, which may have practical applications in controlling the path of vibrational power flow in systems of large extent. Moreover, the influence of the induced vortex power flow in the plate on the acoustic intensity distribution is investigated, showing that the rotational direction of the vortex in the plate is not always the same as that of the acoustic intensity in the near field. © 1996 Institute of Noise Control Engineering.

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Active Wave Control of a Flexible Beam. Fundamental Characteristics of an Active-Sink System and Its Verification.

Cited by 26 publications

References 6 publications

Vibration suppression of a string through cyclic application and removal of constraints

Vibration suppression of a string through cyclic application and removal of constraints

Active control of a distributed-parameter structure using vortex power flow confinement

Vibrational and acoustic power flow of an actively controlled thin plate

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