Sound radiation from a finite length unflanged circular duct with uniform axial flow. II. Computed radiation characteristics

1980 ◽  
Vol 68 (6) ◽  
pp. 1871-1883 ◽  
Author(s):  
G. W. Johnston ◽  
K. Ogimoto
Keyword(s):  
Finite Length ◽  
Sound Radiation ◽  
Axial Flow ◽  
Radiation Characteristics ◽  
Circular Duct

Study on Applicability of Sound Radiation Characteristics of Thin Finite Length Cylindrical Shells Using Wave Propagation Approach

2012 ◽  
Vol 190-191 ◽  
pp. 1325-1330 ◽  
Author(s):  
Bing Ru Li ◽  
Xuan Yin Wang ◽  
Hui Liang Ge ◽  
Yue Peng Jiang
Keyword(s):  
Wave Propagation ◽  
Boundary Conditions ◽  
Finite Length ◽  
Cylindrical Shells ◽  
Great Influence ◽  
Sound Radiation ◽  
Radiation Characteristics ◽  
Stiffened Shells ◽  
Wave Propagation Method ◽  
Mode Truncation

Based on Donnell’s thin shell theory and basic equations, the wave propagation method is discussed here in detail, which is used to investigate the vibration and sound radiation characteristics of thin finite length circular cylindrical shells and ring stiffened shells under various boundary conditions. The effects of boundary conditions, mode truncation, shell’s length, thickness and rings on the acoustic radiation are explored. It is shown that the wave propagation method is more effective for the long cylindrical shell, and the mode truncation can satisfy the calculation accuracy. The conclusion is drawn that the stiffeners have a great influence on the total mechanical impedance while have a slight influence on radiation impedance. The work will give some guidelines for noise reduction of this kind of shell.

Analysis of Sound Radiation Characteristics of Rail by BEM.

1999 ◽  
Vol 65 (638) ◽  
pp. 3986-3991
Author(s):  
Mitsuru ENDO ◽  
Tsutomu NISHIGAKI ◽  
Ko MIZUNO
Keyword(s):  
Sound Radiation ◽  
Radiation Characteristics

Vibration and Sound Radiation Characteristics of Composite Flat-Panel Sound Radiator

2013 ◽  
Vol 431 ◽  
pp. 177-181
Author(s):  
C.H. Jiang ◽  
T.Y. Kam
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Response Spectrum ◽  
Sound Radiation ◽  
Laminated Composite ◽  
Element Model ◽  
Flat Panel ◽  
Radiation Characteristics ◽  
Experimental Approaches ◽  
Vibration And Sound Radiation

The vibration and sound radiation characteristics of laminated composite flat-panel sound radiators are studied via both theoretical and experimental approaches. In the theoretical study, a finite element model is presented to formulate the forced vibration of the sound radiators. The first Rayleigh integral is used to construct the sound pressure level curve of the sound radiators. In the experimental study, a laminated composite sound radiator was subjected to sweep sine excitation to determine the frequency response spectrum from which the natural frequencies of the sound radiator were identified. The sound radiator with salt powder distributed on its top surface was excited to generate the vibration shapes of the sound radiator at several selected frequencies. The SPL curve of the sound radiator was also measured experimentally. The experimental results are then used to verify the feasibility and accuracy of the proposed finite element model.

Sound Radiation Characteristics of Lightweight Roof Constructions Excited by Rain

1994 ◽  
Vol 1 (4) ◽  
pp. 249-270 ◽  
Author(s):  
Hiromi Suga ◽  
Hideki Tachibana
Keyword(s):  
Transmission Loss ◽  
Power Level ◽  
Sound Radiation ◽  
Sound Intensity ◽  
Sound Power ◽  
Radiation Characteristics ◽  
Natural Rainfall ◽  
Artificial Rainfall ◽  
Sound Power Level ◽  
Measurement Results

In order to investigate the sound radiation characteristics of lightweight roof constructions when excited by rainfall, an artificial rainfall apparatus was constructed to simulate natural rainfall conditions. From the measurement results, it can be seen that the facility developed is practically applicable for the examination of the sound radiation characteristics of rain noise. It was therefore used in the measurement of sound power of 20 lightweight roofs. In addition, the relationship between sound power level and sound transmission loss measured by the sound intensity method was investigated statistically. As a result, it has been shown that a linear relationship exists between them and there is a possibility of estimating the sound power level from the transmission loss.

How the sound adjustment process of cymbals affects their vibration and sound radiation characteristics

2016 ◽  
Vol 140 (4) ◽  
pp. 3161-3161
Author(s):  
Fumiyasu Kuratani ◽  
Tatsuya Yoshida ◽  
Toshio Koide ◽  
Taiji Mizuta ◽  
Kozo Osamura
Keyword(s):  
Sound Radiation ◽  
Adjustment Process ◽  
Radiation Characteristics ◽  
Vibration And Sound Radiation
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