&lt;title&gt;Active/passive piezoelectric vibration suppression&lt;/title&gt;

Agnes, Gregory S.

doi:10.1117/12.174112

Cited by 19 publications

(17 citation statements)

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“…Their results closely parallel those [1][2][3] for an MVA [11]. The inductance adjusts the shunt natural frequency, while the resistance changes the response amplitude over some frequency range [14].…”

Section: Piezoelectric Vibration Absorberssupporting

confidence: 74%

“…While this is sufficient for some problems, passive shunts cannot provide the broadband response control required in many applications [2]. For broadband control, active feedback is necessary.…”

Section: Piezoelectric Vibration Absorbersmentioning

confidence: 99%

“…Agnes and Wang, et al, have both suggested a hybrid active/passive piezoelectric shunt network [2], [18]. In this setup, the vibration energy of the structure is partially transformed into electrical energy and passively dissipated in the shunt circuit.…”

Section: -5mentioning

confidence: 99%

“…A hybrid active/passive piezoelectric shunt network has been suggested by both Agnes [2] and Wang, et al [18]. Wang and Tang studied a system similar to the one shown in Figure 1.1, with a PVA attached to each blade.…”

Section: Piezoelectric Vibration Absorbersmentioning

confidence: 99%

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<title>Vibration suppression of a rotationally periodic structure using an adaptive/PPF control law</title>

Keller¹,

Agnes²

2002

SPIE Proceedings

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Section: Piezoelectric Vibration Absorberssupporting

confidence: 74%

Section: Piezoelectric Vibration Absorbersmentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

Section: Piezoelectric Vibration Absorbersmentioning

confidence: 99%

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<title>Vibration suppression of a rotationally periodic structure using an adaptive/PPF control law</title>

Keller¹,

Agnes²

2002

SPIE Proceedings

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“…While the studies on APPN have indeed illustrated promising results, the previous investigations [Agnes, 1994;Wang, 1994, 1995] have not addressed the issue of system robustness.…”

Section: Robust Control Law For Active-passive Hybrid Piezoelectric Nmentioning

confidence: 99%

Active-Passive Hybrid Adaptive Structures for Vibration Controls -- An Integrated Approach

Wang¹

2000

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Public Reporting binden for this collection of infoimation is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and SUPPLEMENTARY NOTESThe views, opinions and/or findings contained in this report are those of the authors) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by the documentation. The objective of this research is to develop, validate and evaluate novel active-passive hybrid adaptive structures for real-time vibration suppressions. These structures could have the advantages of both the passive (stable, low power requirement, fail-safe) and active (high performance, feedback actions) systems. Two types of smart structure configurations have been investigated and advanced: structures with enhanced active constrained layer (EACL) treatment, and structures with active-passive piezoelectric networks (APPN). Accomplishments include: (a) Robust control laws have been synthesized for APPN to compensate for uncertainties, (b) Nonlinear analysis and control methods have been developed to utilize the high authority actions of APPN. (c) The integrated EACL-APPN configuration has been analyzed, it is shown that both the narrowband and broadband controls can be achieved with such configurations, (d) A detailed non-dimensional analysis on EACL performance has been developed to provide design guidelines, (e) A new hybrid constrained layer (HCL) configuration has been developed by mixing both active and passive materials to form hybrid coversheets -such a design can outperform systems with pure active PZT coversheets. SUBJECT TERMS STATEMENT OF THE PROBLEM STUDIEDThe objective of this research is to develop and evaluate novel active-passive hybrid smart structures for real-time vibration controls. This investigation is to advance the current activepassive hybrid technology (the active-passive piezoelectric network (APPN) and the active constrained layer (ACL) approaches) and to eventually achieve an optimally control-configured, high performance vibration rejection system with low power requirements and high reliability and robustness. Being an optimized hybrid structure, it will have the benefits of both the passive (stability, fail-safe, lower power consumption) and active (high performance, feedback and feedforward actions) systems. SUMMARY OF THE MOST IMPORTANT RESULTSThe major achievements are described in the following paragraphs.

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Flexural wave absorption by lossy gradient elastic metasurface

Cao

Yang

et al. 2020

Journal of the Mechanics and Physics of Solids

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In this research, we systematically study the flexural waves diffraction. Based on the diffraction mechanism, we propose the concept of subwavelength lossy gradient elastic metasurface for flexural waves absorption. We theoretically reveal that the highefficiency absorption behavior stems from maximum multireflection-enhanced absorption of 0 th order diffraction, and experimentally show that robust flexural wave quasi-omnidirectional absorption in the frequency range extending approximately from 340 Hz to 1000 Hz (larger than 1.5 octaves). In addition, we propose a general approach which involves new physics of adjusting the arrangement sequence of subunits to suppress the 1 st diffraction mode, to further reduce the sub-wavelength thickness of the metasurface while maintaining its high-efficiency absorption. Our designs could provide new routes to broadband vibration suppression and cancellation in lowfrequency by lossy elastic metamaterials and metasurfaces.

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<title>Active/passive piezoelectric vibration suppression</title>

Cited by 19 publications

References 0 publications

<title>Vibration suppression of a rotationally periodic structure using an adaptive/PPF control law</title>

<title>Vibration suppression of a rotationally periodic structure using an adaptive/PPF control law</title>

Active-Passive Hybrid Adaptive Structures for Vibration Controls -- An Integrated Approach

Flexural wave absorption by lossy gradient elastic metasurface

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