# 대형 디젤엔진의 소음 개선에 대한 기초 연구

• 김규철 (회원, 전북대학교 대학원 정밀기계과) ;
• 이삼구 (회원, 전북대학교 대학원 정밀기계과) ;
• 주봉철 (회원, 전북대학교 기계공학부) ;
• 노병준 (회원, 전북대학교 기계공학부, 자동차신기술연구소)
• Published : 2001.01.01

#### Abstract

The evaluation of the noise for the an existing engine was carried out to improve the current noise level. The applied techniques were 1m air-borne noise, combustion noise analysis, torsional analysis at the front pulley and sound pressure intensity. In addition, the evaluation of the possibility to the noise reduction by means of wrapping the parts was performed to propose the detailed information in engine design. In view of the obtained results, the following countermeasures were recommended to reduce the current noise level through the above methods. Furthermore, in order to assess the influence of combustion noise on the overall engine noise, the noise test was also performed by the change of intake air temperature up to 5$0^{\circ}C$ in steps of 1$0^{\circ}C$. Finally, the fixed design specifications to reduce the engine noise will be decided in consideration of the test data for proto type engine.