scholarly journals On Relation between Similarity Ratio and Acoustic Damping Ratio in One Dimensional Sound Field Partitioned by Perforated Plate with Geometric Similarity

2021 ◽  
Vol 8 (02) ◽  
Author(s):  
Kunihiko ISHIHARA ◽  
Akari GOTO
Keyword(s):  
Damping Ratio ◽  
Perforated Plate ◽  
Sound Field ◽  
Acoustic Damping ◽  
One Dimensional ◽  
Geometric Similarity ◽  
Similarity Ratio

Acoustic natural frequency of one dimensional sound field partitioned by perforated plate

2017 ◽  
Vol 2017.55 (0) ◽  
pp. K1114 ◽  
Author(s):  
Kunihiko Ishihara ◽  
Satoru Kudo ◽  
Takayuki Masumoto ◽  
Masaaki Mori
Keyword(s):  
Natural Frequency ◽  
Perforated Plate ◽  
Sound Field ◽  
One Dimensional

Study on a Countermeasure Using Walls Made of Perforated Plate for High Level Sound

2015 ◽  
Author(s):  
Kunihiko Ishihara ◽  
Masanori Nakaoka
Keyword(s):  
Gas Flow ◽  
Perforated Plate ◽  
Sound Field ◽  
The Self ◽  
Tube Bank ◽  
Perforated Plates ◽  
Acoustic Damping ◽  
Suppression Effect ◽  
High Level ◽  
Very High

Vortices occur when gas flow passes through a duct with a tube bank of heat exchangers, such as a gas heater and/or a boiler. Very high level noise called a “self-sustained tone” occurs due to the interference of the vortices and the sound field in the duct. In general, baffle plates are used to suppress the self-sustained tone. However, it is difficult to use them effectively, because insertion conditions are vague. Then, perforated plates are used in both sides of the duct walls to suppress the self-sustained tones. Because we thought that the perforated plate might have acoustic damping and resonance mode of the duct perpendicular direction to the flow may be suppressed by its damping effect, when the self-sustained tone occurred. Some experiments were carried out to examine the suppression effect of the perforated plates installed. As a result, the suppression effect appeared in all cases. The purpose of this study is to clarify the effectiveness of the perforated plates for self-sustained tones.

Acoustic Natural Frequency and Its Mode of One Dimensional Sound Field Partitioned by Perforated Plate

2017 ◽  
Vol 2017 (0) ◽  
pp. 449 ◽  
Author(s):  
Kunihiko ISHIHARA ◽  
Satoru KUDO ◽  
Takayuki MASUMOTO ◽  
Masaaki MORI
Keyword(s):  
Natural Frequency ◽  
Perforated Plate ◽  
Sound Field ◽  
One Dimensional
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