Sound radiation characteristics analysis for the honeycomb reinforced laminated structures with viscoelastic material fillers through the asymptotic homogenous method

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.

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Sound radiation characteristics of a box-type structure

Journal of Sound and Vibration ◽

10.1016/j.jsv.2009.04.016 ◽

2009 ◽

Vol 325 (4-5) ◽

pp. 835-851 ◽

Cited By ~ 14

Author(s):

Tian Ran Lin ◽

Jie Pan

Keyword(s):

Sound Radiation ◽

Type Structure ◽

Radiation Characteristics

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Sound Radiation Characteristics of Lightweight Roof Constructions Excited by Rain

Building Acoustics ◽

10.1177/1351010x9400100401 ◽

1994 ◽

Vol 1 (4) ◽

pp. 249-270 ◽

Cited By ~ 7

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.

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