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 J. KIMS Technol > Volume 19(4); 2016 > Article
 Journal of the Korea Institute of Military Science and Technology 2016;19(4):453-461. DOI: https://doi.org/10.9766/KIMST.2016.19.4.453
 An Experimental Study on Installation of the Shielding Material to Reduce the Shock Noise of a Gun Haesuk Lee, Junhee Hong 1The 8th Research and Development Institute, Agency for Defense Development2Department of Mechanical Engineering, Chungnam National University 화포소음 저감을 위한 차폐재 설치에 관한 실험적 연구 이해석, 홍준희 1국방과학연구소 제8기술연구본부2충남대학교 기계공학과 Abstract The paper represents the experimental analysis of the shock noise of medium caliber guns when a projectile is passed through the shielding material. In the study, the shielding material was constructed and tested in three separate experiments. The shielding material was not installed for medium caliber gun in Case 1. A medium caliber gun was fully covered with shielding material in Case 2, and another one was put with shielding material near muzzle in Case 3. In each experiment, the experimental data was compared with each other. Results showed the firing shielding material achieved a significant noise reduction in $90^{circ}$ to the noise source. Case 3 is confirmed to be better effective than Case 2 in the near field. But, the noise reduction in the far field is small in quantity due to the low frequency. The paper is considered that further study is necessary for the shielding material which can absorb a low frequency noise in the future. Key Words: Shock Noise, Shielding Material, Noise Reduction