&lt;title&gt;Active control of vibration transmission through struts&lt;/title&gt;

Pelinescu, Ion; Balachandran, Balakumar

doi:10.1117/12.316929

Cited by 5 publications

(2 citation statements)

References 9 publications

(12 reference statements)

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“…These efforts can provide valuable information for the selection of appropriate actuators and understanding the dynamics and control of wave transmission through finite-length active struts. To address the need for integrated mechanics models, in the authors' previous work [13,14], analytical efforts were initiated. The present article follows along the lines of these two previous efforts.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of active control of wave transmission through cylindrical struts

Pelinescu

Balachandran

2001

Smart Mater. Struct.

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In this article, analytical investigations conducted into active control of longitudinal and flexural vibrations transmitted through a cylindrical strut are presented. Mechanics based models for struts fitted with piezoelectric and magnetostrictive actuators are developed, and for harmonic disturbances, a linear dynamic formulation describing the motion of the actuators is integrated with the formulation describing wave transmission through the strut. The resulting system is studied in the frequency domain and open-loop control studies are conducted with the aid of numerical simulations. Comparisons are made between control schemes based on piezoelectric actuators and magnetostrictive actuators, and the effectiveness of these schemes in attenuating wave transmission is also discussed. The studies presented here, which can form the bases for analog feedforward control schemes and model based feedback schemes, illustrate the potential for active suppression of longitudinal and lateral displacements in cylindrical struts over the frequency range extending from 10 Hz to 5 kHz.

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Section: Introductionmentioning

confidence: 99%

Analytical study of active control of wave transmission through cylindrical struts

Pelinescu

Balachandran

2001

Smart Mater. Struct.

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“…In similar research on the control of flexural vibration transmission through cylindrical structures, Pelinescu and Balachandran (1998, 2001a, 2001b and Ortel and Balachandran (1999) conducted analytical and experimental studies to explore the potential of actuators based on piezoelectric and magnetostrictive materials for the active control of wave transmission through cylindrical struts. These studies demonstrated that vibratory disturbances transmitted through a cylindrical strut can be attenuated by controlling the corresponding longitudinal and flexural wave components transmitted to the host structure in the frequency range extending from 10 Hz up to 5 kHz.…”

Section: Introductionmentioning

confidence: 99%

Flexural Vibration Control of the Circular Handlebars of a Bicycle by Using MFC Actuators

Chien

Wei

et al. 2007

Journal of Vibration and Control

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The newly developed Macro Fiber Composite (MFC) actuators are more flexible and conformable than traditional monolithic isotropic piezoceramic actuators, and capable of being surface-bonded in curved structures. In this study, both analytical prediction and experimental investigation are implemented to evaluate the effectiveness of active control of flexural vibration of the handlebars of a bicycle by using MFC actuators. The handlebars are simulated as a cantilevered hollow cylindrical rod surface-bonded with three flexible MFC actuators, two placed at the clamped end and the third at the bent location subjected to flexural vibration transmitted from a head tube. A finite element model and a Euler Bernoulli beam model are utilized to obtain the analytical predictions of natural frequencies and mode shapes of the MFC/handlebars. In the experimental verification, a primary disturbance is assumed to be transmitted from the clamped end, and a secondary force from the MFC actuators. Velocity feedback and a Linear Quadratic Regular (LQR) controller are utilized to determine appropriate voltage input into the MFC actuators. Close agreement is found between the theoretical assumptions and the experiments. The results obtained suggest that using the MFC actuators to control the flexural vibration of the MFC/handlebars of the bicycle is effective.

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Active periodic struts for a gearbox support system

Asiri¹,

Baz²,

Pines³

2006

Smart Mater. Struct.

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Active periodic structures exhibit unique dynamic characteristics that make them act as tunable mechanical filters for wave propagation. As a result, waves can propagate along the periodic structures only within specific frequency bands called the ‘pass bands’ and wave propagation is completely blocked within other frequency bands called the ‘stop bands’. The spectral width of these bands can be tuned according to the nature of the external excitation. In this paper, the emphasis is placed on developing a new class of these periodic structures called active periodic struts (APS) which can be used to support gearbox systems on the airframes of helicopters. When designed properly the APS can stop the propagation of vibration from the gearbox to the airframe within critical frequency bands and consequently minimize the effects of transmission of undesirable vibration and sound radiation to the helicopter cabin. The theory governing the operation of this class of APS is presented and their tunable filtering characteristics are demonstrated experimentally as a function of their design parameters. The presented concept of the APS can be easily employed in many applications to control the wave propagation and the force transmission in an attempt to stop/confine the propagation of undesirable disturbances.

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<title>Active control of vibration transmission through struts</title>

Cited by 5 publications

References 9 publications

Analytical study of active control of wave transmission through cylindrical struts

Analytical study of active control of wave transmission through cylindrical struts

Flexural Vibration Control of the Circular Handlebars of a Bicycle by Using MFC Actuators

Active periodic struts for a gearbox support system

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