Influence of the circular perforation holes perimeter length on sound insulation properties of sheet material and gas-dynamic resistance
EDN: ZHTYMM
Abstract
Introduction (problem statement and relevance). Since the information on the dependence of perforated plates geometric parameters and influence of their characteristics on suppression degree when transmitting sound waves, as well as on resistance to the gas flow, is limited but required when designing noise suppressor elements of internal combustion engine gas exchange systems, there is a need to study this matter and to determine these interrelations.
The purpose of the study is to reveal the dependence of parameters of sound insulation capability and gas-dynamic resistance and the length of perimeter of various number of circular holes on given area of the sheet material surface with the same perforation coefficient (equal total area of the holes).
Methodology and research methods. Experimental studies of various plate samples with perforation variants have been performed using laboratory facilities of FSUE “NAMI” Automotive Industry Product Testing Center, along with simulation of acoustic and gas-dynamic characteristics in the COMSOL Multiphysics and ANSYS software environment.
Scientific novelty and results. Parameters of sound transmission loss measured on the “Cold engineless installation” and backpressure measured on the “Air filter test bench” for perforated plates have been presented in comparison with the calculated values. It was revealed that there is an expressed dependence of the mentioned properties on the total perimeter length of the circular perforation holes of different diameter.
Practical significance. Analysis of the obtained results allowed the authors to make conclusions that the method of determining sound insulation properties of perforated structures in the impedance tube with normal sound waves incidence is in some degree limited in terms of its application and needs further research with other parameters of the acoustic environment.
About the Authors
I. V. Malkin
Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Russian Federation
Russian Federation
Malkin I.V. – PhD (Eng), chief specialist, Center “Power units”
Moscow 125438
A. O. Glazkov
Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Russian Federation
Russian Federation
Glazkov A.O. – postgraduate, leading research engineer, Center “Power units”
Moscow 125438
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Review
For citations:
Malkin I.V., Glazkov A.O. Influence of the circular perforation holes perimeter length on sound insulation properties of sheet material and gas-dynamic resistance. Trudy NAMI. 2025;(1):106-116. (In Russ.) EDN: ZHTYMM
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