Coupled vibration and sound radiation from a fluid‐filled and submerged or embedded vascular tube with internal turbulent flow due to a constriction

2005 ◽  
Vol 117 (4) ◽  
pp. 2587-2588
Author(s):  
Yigit Yazicioglu ◽  
Thomas J. Royston ◽  
Todd Spohnholtz ◽  
Bryn Martin ◽  
Francis Loth ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Sound Radiation ◽  
Coupled Vibration ◽  
Vibration And Sound Radiation

Simulation of Vibration and Acoustic Radiation of Finite Underwater Cylindrical Shells

2000 ◽  
Author(s):  
X. M. Zhang ◽  
G. R. Liu ◽  
K. Y. Lam
Keyword(s):  
Acoustic Analysis ◽  
Acoustic Radiation ◽  
Cylindrical Shells ◽  
Sound Radiation ◽  
Coupled Vibration ◽  
Response Curves ◽  
Vibration And Sound Radiation ◽  
Acoustic Domain ◽  
High Sound ◽  
Element Method

Abstract A coupled structural-acoustic analysis of vibration and sound radiation of underwater finite cylindrical shells is investigated in this paper. The coupled vibration and radiation problem is formulated using Finite Element Method (FEM) for the structure and Boundary Element Method (BEM) for the acoustic domain. Vibration and sound radiation under symmetrical and unsymmetrical point force excitations are examined. It is shown that the coupled modals are the causes of large vibration of the shell and high sound pressure radiation of the acoustic fields. The shapes of frequency response curves of pressure are quite similar in the far fields but change greatly in the near fields.

scholarly journals Sound Radiation and Vibration of Composite Panels Excited by Turbulent Flow: Analytical Prediction and Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-18 ◽  
Author(s):  
Joana Rocha
Keyword(s):  
Turbulent Flow ◽  
Random Noise ◽  
Sound Radiation ◽  
Analytical Framework ◽  
Mathematical Framework ◽  
Composite Panels ◽  
Analytical Prediction ◽  
The Difference ◽  
Vibration And Sound Radiation ◽  
Aluminum Panels

The present study investigates the vibration and sound radiation by panels exited by turbulent flow and by random noise. Composite and aluminum panels are analyzed through a developed analytical framework. The main objective of this study is to identify the difference between the vibroacoustic behaviour of these two types of panels. This topic is of particular importance, given the growing interest in applying composite materials for the construction of aircraft structures, in parts where aluminum panels were traditionally being used. An original mathematical framework is presented for the prediction of noise and vibration for composite panels. Results show the effect of panel size, thickness of core, and thickness of face layers on the predictions. Smaller composite panels generally produced lower levels of sound and vibration than longer and wider composite panels. Compared with isotropic panels, the composite panels analyzed generated lower noise levels, although it was observed that noise level was amplified at certain frequencies.

Effect of Different Input Loading Form on Structure-Born Sound Radiation

2012 ◽  
Vol 518-523 ◽  
pp. 3768-3771
Author(s):  
Zhi Yong Xie ◽  
Qi Dou Zhou ◽  
Gang Ji
Keyword(s):  
Experimental Data ◽  
Forced Vibration ◽  
Sound Radiation ◽  
Added Mass ◽  
Elastic Vibration ◽  
Simulation And Experiment ◽  
Radiation Induced ◽  
Vibration And Sound Radiation ◽  
Loading Form ◽  
Good Agreement

The exciting force’s accurate measurement of is crucial to the structure-born sound radiation. Forced vibration and sound radiation of the ribbed cylinder is examined in the anechoic room. An approach called added mass and damping method is proposed to calculate the elastic vibration and acoustic field of the cylinder. Results obtained from simulation are show to be in good agreement with the experimental data. Sound radiation induced by different input loading form is examined via simulation and experiment. And the equipollence of force and pressure acting on the base is validated.

scholarly journals Sound Radiation from Turbulent Flow near Flexible Surfaces

1964 ◽  
Vol 36 (10) ◽  
pp. 2012-2012
Author(s):  
John E. Ffowcs‐Williams
Keyword(s):  
Turbulent Flow ◽  
Sound Radiation

Vibration and sound radiation of a plate

1975 ◽  
Vol 58 (S1) ◽  
pp. S43-S43 ◽  
Author(s):  
Robert J. Hannon
Keyword(s):  
Sound Radiation ◽  
Vibration And Sound Radiation

scholarly journals Characteristics of Vibration and Sound Radiation of Metro Resilient Wheel

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Xin Zhou ◽  
Jian Han ◽  
Yue Zhao ◽  
Bing Wu ◽  
Gong Cheng ◽  
...  
Keyword(s):  
Sound Radiation ◽  
Vibration And Sound Radiation

Vibrational and acoustic radiation from a submerged periodic cylindrical shell with axial stiffening

2009 ◽  
Vol 223 (5) ◽  
pp. 1083-1089 ◽  
Author(s):  
C-J Liao ◽  
W-K Jiang ◽  
H Duan ◽  
Y Wang
Keyword(s):  
Cylindrical Shell ◽  
Analytical Study ◽  
Acoustic Radiation ◽  
Sound Radiation ◽  
Mechanical Impedance ◽  
Stiffened Cylindrical Shell ◽  
Reaction Forces ◽  
Radial Forces ◽  
Vibration And Sound Radiation ◽  
Finite Cylindrical Shell

An analytical study on the vibration and acoustic radiation from an axially stiffened cylindrical shell in water is presented. Supposing that the axial stiffeners interact with the cylindrical shell only through radial forces, the reaction forces on the shell from stiffeners can be expressed by additional impedance. The coupled vibration equation of the finite cylindrical shell with axial stiffening is derived; in this equation additional impedance caused by the axial stiffeners is added. As a result, the vibration and sound radiation of the shell are dependent on the mechanical impedance of the shell, the radiation sound impedance, and the additional impedance of the axial stiffeners. Based on the numerical simulation, it is found that the existence of axial stiffeners decreases the sound radiation and surface average velocity, whereas it increases the radiation factor. The characteristics of the acoustic radiation can be understood from the simulation with good results, which show that the presented methodology can be used to study the mechanism of the acoustic radiation of the complicated cylindrical shell and to optimize its design.

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