The Experts below are selected from a list of 16044 Experts worldwide ranked by ideXlab platform

Yanzheng Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Thermal buckling and Sound Radiation behavior of truss core sandwich panel resting on elastic foundation
    International Journal of Mechanical Sciences, 2019
    Co-Authors: Zhaobo Chen, Yanzheng Zhao
    Abstract:

    Abstract Due to high stiffness and other potential multifunctional application characteristics, truss core sandwich structure offers a promising alternative to traditional stiffened or corrugated sandwich plates used in aerospace and marine industry. And Sound Radiation from plate structures is a design factor indicating the power reduction, which can help the lattice truss core sandwich structure meet the acoustic requirements for practical engineering design, but the Sound Radiation performance of this sandwich structure remains unclear. Based on that, the thermal buckling and Sound Radiation behavior analyses of truss core sandwich structure resting on elastic foundation in thermal environment are presented in this paper. The mechanical behavior of structure–foundation interaction is modeled as two-parameter model including Winkler and shear foundation. The Sound Radiation due to a concentrated harmonic force in thermal environment is computed by solving the Rayleigh integral. By comparing with numerical simulation results calculated by commercial finite element software, the accuracy and feasibility of theoretical model developed in this paper are validated. The effects of several key parameters including the truss core radius, inclination angle and height, temperature field and elastic foundation stiffness coefficient on thermal buckling and Sound Radiation behavior have been subsequently investigated.

Hong Yi - One of the best experts on this subject based on the ideXlab platform.

  • Vibration and Sound Radiation of submerged finite cylindrical shells with pre-stress
    Scientific Reports, 2019
    Co-Authors: Hongdong Wang, Hong Yi
    Abstract:

    Theoretical solutions of vibration and Sound Radiation of submerged finite cylindrical shells with pre-stress were derived by using a modal summation method. Motion equations of cylindrical shells with pre-stress were established on the basis of Flugge theory. Additional impedance caused by pre-stress was added to the basic vibration equation. Pre-stress was expressed by uniform and trigonometric forms to obtain the Sound Radiation power, mean quadratic velocity and Radiation efficiency of cylindrical shells. Numerical calculation was conducted to study the effects of tensile and compressive stresses, stress direction, value size and distribution on vibration and Sound Radiation of cylindrical shells. This study may provide a reference for controlling Sound Radiation of underwater vehicles.

Cheuk Ming Mak - One of the best experts on this subject based on the ideXlab platform.

Zhaobo Chen - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of Dynamic Vibration Absorbers for Suppressing Sound Radiation of Plate Structures
    Journal of Vibration and Acoustics, 2020
    Co-Authors: Guanghe Huo, Zhaobo Chen, Jiao Yinghou, Xuezhi Zhu
    Abstract:

    Abstract Dynamic vibration absorber (DVA) is a practical tool used for Sound and vibration suppression in the specific frequency band. The parameters of DVAs should be optimally tuned to obtain the best Sound and vibration suppression application effects. When the DVAs are used for structural vibration reduction, DVAs’ two parameters which are the optimal frequency ratio and damping ratio have simple analytical expressions. However, the concise analytical expressions of the DVAs that are used for suppressing the structural Sound Radiations have not been reported. First, this paper investigates the characteristics of DVAs in suppressing Sound Radiation from thin plates. Second, the fixed points’ phenomenon of the Sound Radiations of the plate carrying DVAs is revealed. In addition, the classical fixed points’ theory is extended into the optimization process of the DVAs that are used for Sound Radiation control of the plate. The analytical expression of the optimal frequency ratio, as well as the damping ratio optimization method of the DVA, is simultaneously proposed. Third, the installation position of DVAs is also presented to obtain a better acoustic Radiation effect. Finally, the numerical simulations are performed to verify the availability of the method. It is showed that the best Sound Radiation control effect could be obtained by adopting the optimization means proposed in this paper.

  • Thermal buckling and Sound Radiation behavior of truss core sandwich panel resting on elastic foundation
    International Journal of Mechanical Sciences, 2019
    Co-Authors: Zhaobo Chen, Yanzheng Zhao
    Abstract:

    Abstract Due to high stiffness and other potential multifunctional application characteristics, truss core sandwich structure offers a promising alternative to traditional stiffened or corrugated sandwich plates used in aerospace and marine industry. And Sound Radiation from plate structures is a design factor indicating the power reduction, which can help the lattice truss core sandwich structure meet the acoustic requirements for practical engineering design, but the Sound Radiation performance of this sandwich structure remains unclear. Based on that, the thermal buckling and Sound Radiation behavior analyses of truss core sandwich structure resting on elastic foundation in thermal environment are presented in this paper. The mechanical behavior of structure–foundation interaction is modeled as two-parameter model including Winkler and shear foundation. The Sound Radiation due to a concentrated harmonic force in thermal environment is computed by solving the Rayleigh integral. By comparing with numerical simulation results calculated by commercial finite element software, the accuracy and feasibility of theoretical model developed in this paper are validated. The effects of several key parameters including the truss core radius, inclination angle and height, temperature field and elastic foundation stiffness coefficient on thermal buckling and Sound Radiation behavior have been subsequently investigated.

Jie Pan - One of the best experts on this subject based on the ideXlab platform.

  • Sound Radiation from a fluid-loaded plate with periodic inhomogeneities of finite width
    The Journal of the Acoustical Society of America, 2016
    Co-Authors: Yanni Zhang, Hai Huang, Jie Pan
    Abstract:

    This paper focuses on the frequency-filtering behavior of the structural vibration and Sound Radiation of a fluid-loaded plate with periodic inhomogeneities of finite width. The passbands of the flexural waves in the plate and the frequency bands of effective Sound Radiation from the plate are examined for air and water loading conditions. The mechanisms that generate the differences in these two bands are explained by analyzing the dispersion curves of the waves in the plate and the Sound Radiation behavior of supersonic wavenumber components in the plate vibration. The effects of fluid loading on the properties of these two bands are highlighted. A parametric study is also conducted to illustrate the effects of the width and magnitude of the inhomogeneities on the Sound Radiation characteristics.

  • Underwater Sound Radiation from an elastically coated plate with an embedded and distributed inhomogeneity
    The Journal of the Acoustical Society of America, 2015
    Co-Authors: Yanni Zhang, Jie Pan
    Abstract:

    This paper studies the effects of an embedded and distributed inhomogeneity on the underwater Sound Radiation from an elastically coated plate. Embedding a signal conditioning plate (SCP) in the coating material provides an extra parameter for controlling the Sound Radiation of the plate, as compared with the previous design with an SCP on the coating surface [Y. Zhang and J. Pan, J. Acoust. Soc. Am. 133(1), 173–185 (2013)]. For such a configuration, the vibration and Sound responses of the coated plate to a point force excitation are described by three coupled Fredholm integral equations of the second kind. Its acoustical properties are examined by comparing the Radiation powers from plates without an SCP, with a surface SCP, and with an embedded SCP. The differences in the Sound powers are explained through resonance and scattering caused by the interaction of the embedded SCP with structural waves. The effects of the depth of the embedded SCP in the coating material on the Sound Radiation properties of the plate are discussed in detail.

  • Sound Radiation from a fluid-loaded infinite plate with a patch
    The Journal of the Acoustical Society of America, 2013
    Co-Authors: Yanni Zhang, Jie Pan
    Abstract:

    This paper focuses on the solution to the vibro-acoustic response of a line-driven fluid-loaded plate with an elastic patch acting as a distributed inhomogeneity. The patch affects the plate's Sound Radiation by adding extra loading to the driving force and by scattering structural waves. When the driving force is located beneath the patch, the extra loading reduces the plate's supersonic velocity response and Sound Radiation. At some frequencies, however, the constructive superposition of scattered structural waves and near-field waves by the driving force outweighs the effect of patch loading and results in an increased Sound Radiation power. When the patch is located away from the driving force, wave scattering phenomena dominates the plate vibration and subsequent Sound Radiation. By examining the effect of the length and location of the patch on the Sound power, it is possible to relate the changes in the Sound power to the changes in supersonic velocity spectrum and velocity distribution contributed by the trapped modes in the patched area and interference between the scattered waves by the patch and the near- and far-field structural waves directly generated by the driving force.

  • Sound Radiation of a plate into a reverberant water tank
    2012
    Co-Authors: Jie Pan
    Abstract:

    This paper presents a study on Sound Radiation from a finite plate into a reverberant water tank and its dependence on the modal coupling of the plate’s modes through their radiating field. The results of this study are compared with that of Sound Radiation of the plate into a free space for establishing a general understanding of the effects of fluid loading on the structural vibration and Sound Radiation into various spaces.

  • Underwater Sound Radiation by a layered infinite elastic plate with discontinuity
    2010
    Co-Authors: Yanni Zhang, Jie Pan, Darryl Mcmahon
    Abstract:

    The underwater Sound Radiation from layered structu re is determined by the properties of elastic waves in the structure and by interaction between structural/structur al waves and between structural/fluidal waves. In t his paper, a model of a layered infinite plate is used to addres s how the properties and interaction influence the near field and far field characteristics of the radiated Sound. In par ticular, the effect of structural discontinuity int roduced to the layered plate by a finite signal conditioning plate on unde rwater Sound Radiation is investigated. The scatter ing of structural waves in the layered plate by the signal conditioni ng plate is used to explain the changes in the radi ated Sound due to the discontinuity.