Underwater sound radiation from an elastically coated infinite plate with periodic inhomogeneities of finite width

2017 ◽  
Vol 142 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Yanni Zhang ◽  
Hai Huang ◽  
Jie Pan
Keyword(s):  
Infinite Plate ◽  
Sound Radiation ◽  
Finite Width ◽  
Underwater Sound ◽  
Periodic Inhomogeneities

Underwater sound radiation apparatus

2008 ◽  
Vol 123 (5) ◽  
pp. 2462
Author(s):  
Takayuki Watanabe ◽  
Shinji Kishinaga
Keyword(s):  
Sound Radiation ◽  
Underwater Sound

Active vibration isolation and underwater sound radiation control

2008 ◽  
Vol 318 (4-5) ◽  
pp. 725-736 ◽  
Author(s):  
Zhiyi Zhang ◽  
Yong Chen ◽  
Xuewen Yin ◽  
Hongxing Hua
Keyword(s):  
Vibration Isolation ◽  
Sound Radiation ◽  
Underwater Sound ◽  
Radiation Control ◽  
Active Vibration ◽  
Active Vibration Isolation

Influence of Acoustic Coating on the Underwater Sound Radiation of a Double Hull Cylindrical Shell Structure

2011 ◽  
Vol 338 ◽  
pp. 406-410
Author(s):  
Fu Zhen Pang ◽  
Fu Bin Pang ◽  
Xu Chao Yin ◽  
Shuai Lv
Keyword(s):  
Cylindrical Shell ◽  
Noise Reduction ◽  
Shell Structure ◽  
Sound Radiation ◽  
Radiation Characteristic ◽  
Underwater Sound ◽  
Surrounding Water ◽  
Covering Density ◽  
Hull Structure ◽  
Double Hull

This paper studies the influence of acoustic coating to the underwater sound radiation characteristic of a double hull cylindrical shell by the Statistical Energy Analysis (SEA) method. Influence of covering density and laying location of acoustic coating to the underwater sound radiation characteristic of the double hull cylindrical shell structure are discussed. Study shows that low covering density of acoustic coating will cause “sound leaking” phenomena, sound will leak out from the uncovered area of the double hull cylindrical hull structure and radiate into the surrounding water, which harms the underwater noise reduction performance of the acoustic coating; however, the noise reduction capacity of the acoustic coating improves gradually as the covering density increases. Besides, laying location of acoustic coating also impact the underwater sound radiation performance of the double hull cylindrical shell structure; inner hull covered with acoustic coating is better than the outer hull covered from the noise treatment point of view

Research on Vibration and Sound Radiation from Submarine Functionally Graded Material Nonpressure Cylindrical Shell

2013 ◽  
Vol 690-693 ◽  
pp. 3046-3049
Author(s):  
Yan Bing Zhang ◽  
Chun Yu Ren ◽  
Xi Zhu
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Radiation ◽  
Radiation Power ◽  
Sound Radiation ◽  
Functionally Graded ◽  
Underwater Sound ◽  
Graded Materials ◽  
Graded Material ◽  
Vibration And Sound Radiation ◽  
Sound Radiation Power

In this paper, we establish the finite element (FEM) and boundary element (BEM) models of a submarine section, and study the underwater sound radiation field of three different non-pressure shells made of steel, steel with anechoic tile, and the functionally graded materials (FGM) separately using a method combining of FEM and BEM . Research shows that the combination of FEM and BEM can address the acoustic radiation calculation problem of FGM, and in comparison with steel and anechoic tile laying submarine section, the weight of FGM non-pressure shell reduces 1600kg, and the sound radiation power decreases 4db and 2.5db respectively, thus having better performance in vibration and noise reduction.

The Approximate Distribution of Stress in a Finite Plate Having a Stress-Free Circular Cut-Out

1964 ◽  
Vol 68 (639) ◽  
pp. 204-208 ◽  
Author(s):  
H. Waters
Keyword(s):  
Outer Boundary ◽  
Practical Importance ◽  
Infinite Plate ◽  
Approximate Solutions ◽  
Finite Width ◽  
Infinite Length ◽  
Uniform Tension ◽  
Approximate Distribution ◽  
Axis Of Symmetry ◽  
Distribution Of Stress

The distribution of stress in a flat plate having a circular cut-out and subjected to known forces at its outer boundary is of considerable practical importance. Assuming that (i) the plate is thin, so that the problem is one of plane stress, and (ii) the material of which it is formed is isotropic and obeys Hooke's law, exact or approximate solutions have been obtained for a limited number of particular cases. Most of these solutions relate to a plate which is infinite in extent in one or more directions. The case of a plate of finite width and infinite length having a circular hole on the axis of symmetry was discussed by Howland, and by Howland and Stevenson. Wang gave an approximate solution for a perforated shear web, and Mindlin investigated the stress distribution around a hole near the edge of a semi-infinite plate under uniform tension.

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