http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
다공관 출구로부터 방사된 충격성 소음에 관한 실험적 연구
허성욱(Sung-Wook Heo),제현수(Hyun-Su Je),양수영(Soo-Young Yang),이동훈(Dong-Hoon Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This experimental study describes the propagation characteristics and suppression of the impulse noise emitted from the exit of<br/> a perforated pipe attached to the open end of a simple shock tube. The experiment is performed through the systematic change of<br/> the shock wave Mach number and the geometrical parameters such as the porosity, hole diameter and length of the perforated pipe.<br/> The experimental results for the near and far sound field are presented and explained in comparison with those for a straight pipe.<br/> The results obtained show that for the near sound field the impulse noise strongly propagates toward to the pipe axis, but for the far<br/> sound field the impulse noise uniformly propagates toward to the all directions, indicating that the directivity pattern is almost same<br/> regardless of the pipe type. Moreover, the noise reduction performance of perforated pipe depends upon the condition of sound field.<br/> For the near sound field the perforated pipe has a little performance to suppress the impulse noise, but for the far sound field the<br/> perforated pipe has little performance to suppress the impulse noise.