Effect of the Rib and Material Change for Noise Reduction and Lightweight of a Cylindrical Shell Type Gearbox

2017 ◽  
Vol 27 (6) ◽  
pp. 776-783
Author(s):  
Chan IL Park
Keyword(s):  
Cylindrical Shell ◽  
Noise Reduction ◽  
Material Change ◽  
Shell Type

Noise Reduction in a Cylindrical Shell

1966 ◽  
Vol 39 (6) ◽  
pp. 1254-1255 ◽  
Author(s):  
Jerome E. Manning
Keyword(s):  
Cylindrical Shell ◽  
Noise Reduction

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

scholarly journals Simulation Analysis of Cylindrical Shell Cavity Noise with Melamine Foam Lining

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Menghui Qi ◽  
Bin Li ◽  
Shilin Yan ◽  
Qinghua Yan ◽  
Qiyu He
Keyword(s):  
Cylindrical Shell ◽  
Noise Reduction ◽  
Simulation Analysis ◽  
Cylindrical Shells ◽  
Element Model ◽  
Measured Data ◽  
Frequency Noise ◽  
Precision Instrument ◽  
Different Thickness ◽  
Melamine Foam

To solve the problem of the harsh midlow frequency noise of rocket fairing, the cylindrical section of the protective precision instrument fairing is simplified as cylindrical shells, and different lining strategies of melamine foam (MF) are studied experimentally and numerically. Based on Virtual.Lab Acoustic software, a finite element model of the cylindrical cavity is established, and the correctness is verified by comparison with the measured data. On that basis, the influences of the lining position of different thickness MF on the noise reduction of cylindrical shells are investigated. It is shown that the thickness and location of the laying material have a significant effect on the noise reduction at the same specific gravity.

Vertical elastic dynamic impedance of a large diameter and thin-walled cylindrical shell type foundation

2017 ◽  
Vol 95 ◽  
pp. 138-152 ◽  
Author(s):  
Rui He ◽  
Lizhong Wang ◽  
Ronald Y.S. Pak ◽  
Zhen Guo ◽  
Jinhai Zheng
Keyword(s):  
Cylindrical Shell ◽  
Large Diameter ◽  
Dynamic Impedance ◽  
Shell Type ◽  
Thin Walled
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