| A Study on the Improvement of Acoustic Characteristics of Wheeled Armored Command Vehicles
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| Myoung Woon Kim , Seong Mok Moon , Ho Bum Kim |
| Analysis and Evaluation Team , Hyundai-Rotem Company |
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| ABSTRACT |
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The acoustic characteristics of Wheeled Armored Command Vehicles (WACV), a wheel-driven military combat vehicle, were improved by applying sound absorption materials. An analysis program was developed using index that can objectively evaluate the S&R (Squeak & Rattle) perceived subjectively by passengers, and the improvement of S&R and noise level at each stage of the study was confirmed. After the sound absorption material was selected in the material unit through analytical and experimental method based on Biot theory, the degree of improvement in acoustic characteristics during driving was evaluated while installing it in the vehicle. After installing the sound absorption materials on the partition wall of the engine room in the vehicle hull structure state, the vehicle was assembled and installed in the order of the interior top, side, and driver’s cabin, and finally, engine encapsulation was performed to shield the engine surface with sound absorption materials. Through a series of processes, the noise level was improved by 8.76 dBA and S&R level by 9.64, and it was confirmed that the engine cooling performance was not deteriorated by the engine encapsulation through a temperature test using thermocouples.
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| Key Words:
Wheeled armored command vehicle, Squeak & Rattle, Noise level, Sound absorption material, Encapsulation
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Corresponding Author.
Myoung Woon Kim , Email. 
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