Recently, the quiet fan development is one of important issues for comfort of railroad car. The purpose of this study is to find the vibration and noise source of the line flow fan for reduction the noise level. For a vibration and noise source identification, experiments with microphone and acceleration were carefully carried out. The noise of line flow fan is caused by various factors, such as turbulent flow noise, blade passing frequence and unbalance. In order to reduce the fan noise, the blade shape, distance and angle of housing guide should be modified.

Abstract
 1. 서론
 2. 라인 플로우 팬의 소음 진동 특성
  2.1 소음 측정 및 분석
  2.2 진동 측정 및 분석
 3. 소음원 규명과 저소음화 대책
 4. 결론
 참고문헌

• 이진갑(경기과학기술대학 기계자동화과) | J. K. LEE