Effect of set position of perforated plate on acoustic natural frequency of one dimensional sound field

Kudo, Satoru; Ishihara, Kunihiko

doi:10.1299/jsmeenv.2018.28.128

Cited by 2 publications

(2 citation statements)

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“…It has been confirmed that the perforated plate suppressed the self-sustained tone generated from heat exchangers like a boiler by using it on a duct wall [3]～ [6]. The effects of the perforated plate on the acoustic natural frequency of an one dimensional sound field partitioned with the perforated plate has been studied in our previous investigations [7], [8]. It was clarified that the acoustic natural frequency of the one dimensional sound field partitioned with the perforated plate becomes lower as the aperture ratio becomes smaller.…”

Section: Introductionmentioning

confidence: 74%

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Relation between peak value and acoustic damping of sound pressure level of one dimensional sound field partitioned with perforated plates

Ishihara¹,

Goto²,

Kashino³

2019

IJEAS

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In an industry field, the acoustic characteristics such as a resonance frequency and an acoustic damping ratio are often required. The response test due to a random noise wave and the sweep test due to a sinusoidal wave can be performed in those cases. In vibration theory, it is well known that the peak value at resonance is inversely proportional to the damping ratio. Is it true even in the acoustic theory? If it can be true the acoustic damping ratio can be obtained simply by the peak sound pressure level after the relation between the peak value and the damping ratio is examined only once. In this study, the sound pressure level of the one dimensional duct with the perforated plate will be calculated by the transfer matrix method in various parameters such as the aperture ratio, the hole's length and the set position of the plate. These calculations are conducted for the first mode, the second mode and third mode. And the relation between the peak value and the damping ratio are examined.

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Section: Introductionmentioning

confidence: 74%

“…This is coincident with the result derived from the calculation result. As a result, it was reasonable that the damping to the one dimensional sound field partitioned with the perforated plate can be given like the equation (8).…”

Section: Consider the Viscous Coefficient C (N・smentioning

confidence: 99%

Relation between peak value and acoustic damping of sound pressure level of one dimensional sound field partitioned with perforated plates

Ishihara¹,

Goto²,

Kashino³

2019

IJEAS

Self Cite

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Study on a method for estimating acoustic natural frequency of one dimensional sound field partitioned by perforated plate

Ishihara

Kudo

2019

Transactions of the JSME (In Japanese)

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A perforated plate is used as an acoustic absorption material for compressors and acoustic barriers for roads and railways. The effects of the perforated plate on the acoustic natural frequency of an one dimensional sound field partitioned with the perforated plate has been studied in our previous investigations. And it was clarified that the acoustic natural frequency of the one dimensional sound field partitioned with the perforated plate becomes lower as the aperture ratio becomes smaller. There are two methods obtaining the acoustic natural frequencies. One is the method based on the eigenvalue analysis. And the other is the one based on the peak frequency of the response analysis. In this paper, the impedance derived by Melling is used for the response analysis. we compared two acoustic natural frequencies calculated by different two methods. As a result, it was clarified that the acoustic natural frequency calculated by the response analysis was a little smaller than that calculated by the eigenvalue analysis in all conditions. But its difference is small, and both the acoustic natural frequencies calculated by two methods agree with experimental results. And it has become easier to physically understand the analytical and experimental results by considering and comparing the element of transfer matrix.

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Effect of set position of perforated plate on acoustic natural frequency of one dimensional sound field

Cited by 2 publications

References 0 publications

Relation between peak value and acoustic damping of sound pressure level of one dimensional sound field partitioned with perforated plates

Relation between peak value and acoustic damping of sound pressure level of one dimensional sound field partitioned with perforated plates

Study on a method for estimating acoustic natural frequency of one dimensional sound field partitioned by perforated plate

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