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  • Zhiyi, Zhang  (3)
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  • 1
    Online Resource
    Online Resource
    Design and optimization of periodic structure mechanical filter in suppression of foundation resonances
    Elsevier BV ; 2011
    In:  Journal of Sound and Vibration Vol. 330, No. 20 ( 2011-9), p. 4689-4712
    Details
    In: Journal of Sound and Vibration, Elsevier BV, Vol. 330, No. 20 ( 2011-9), p. 4689-4712
    Type of Medium: Online Resource
    ISSN: 0022-460X
    URL: Article
    DOI: 10.1016/j.jsv.2011.05.027
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2011
    detail.hit.zdb_id: 1471444-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Design scheme of a passive isotropic multi-strut vibration isolation platform constructed by three-parameter isolators based on the optimum damping frequency concept
    SAGE Publications ; 2018
    In:  Journal of Vibration and Control Vol. 24, No. 17 ( 2018-09), p. 3931-3943
    Details
    In: Journal of Vibration and Control, SAGE Publications, Vol. 24, No. 17 ( 2018-09), p. 3931-3943
    Abstract: A design procedure based on the optimum damping frequency of the three-parameter isolator is proposed to construct a passive isotropic multi-strut vibration isolation platform (VIP) with three-parameter isolators. Two steps are necessary to implement the proposed design scheme. The first step is determination of the optimal damping frequency of the three-parameter isolator; the second step is designing the isofrequency VIP with natural frequencies tuned as the optimal damping frequency in three orthogonal directions. Three methods are summarized to identify the optimal damping frequency theoretically or experimentally. A frequency response function (FRF)-based substructuring method is proposed to predict natural frequencies of the VIP in an isolation system, which accounts for the coupling between different directions and structural flexibilities. Analytical expressions of configurations to implement isofrequency VIP are derived from FRF-based substructuring method for special cases. The three-parameter isolator by employing bellows is manufactured and a hexapod VIP is built. The proposed design scheme is verified by identifying the optimal damping frequency and comparing acceleration transmissibility under vertical and horizontal base displacement excitation for varying loaded mass. The study can shed some light on the design of a passive multi-strut VIP with three-parameter isolators.
    Type of Medium: Online Resource
    ISSN: 1077-5463 , 1741-2986
    URL: Article
    DOI: 10.1177/1077546317717403
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2070247-4
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  • 3
    Online Resource
    Online Resource
    Multi-channel Active Vibration Isolation for the Control of Underwater Sound Radiation From A Stiffened Cylindrical Structure: A Numerical Study
    ASME International ; 2012
    In:  Journal of Vibration and Acoustics Vol. 134, No. 1 ( 2012-02-01)
    Details
    In: Journal of Vibration and Acoustics, ASME International, Vol. 134, No. 1 ( 2012-02-01)
    Abstract: Numerical simulation of vibration control of a submerged stiffened cylindrical structure with active vibration isolators is presented. Vibration transmission from vibrating machinery to the cylindrical structure through the active vibration isolators is analyzed by a numerical model synthesized from frequency response functions (FRFs) and impedances. The coupled finite element/boundary element (FE/BE) method is employed to study the vibro-acoustic behavior of the fluid-loaded cylindrical structure. Sound pressure in the far-field is calculated in terms of the pressure and normal acceleration of the outer surface of the cylindrical shell. An adaptive multichannel control based on the filtered-x least mean squares (FxLMS) algorithm is used in the active vibration isolation. Simulation results have demonstrated that suppression of vibration of the four elastic foundations attached to the cylindrical shell will reduce the spatial-average mean-square velocity and the instantaneous radiated power of the cylindrical shell. As a result, suppression of vibration of the foundations leads to attenuation of sound radiation in the far-field induced by the radial displacement dominant mode of the shell. Moreover, vibration suppression is greatly influenced by the strong couplings among control channels. According to these results, it can be concluded that the proposed method is effective in the analysis of underwater sound radiation control of cylindrical structures.
    Type of Medium: Online Resource
    ISSN: 1048-9002 , 1528-8927
    URL: Article
    DOI: 10.1115/1.4004684
    Language: English
    Publisher: ASME International
    Publication Date: 2012
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