SURFACE ACOUSTICAL INTENSITY MEASUREMENTS ON A DIESEL ENGINE
The use of surface intensity measurements as an alternative to the conventional selective wrapping technique of noise source identification and ranking on diesel engines was investigated. A six cylinder, in line turbocharged, 350 horsepower diesel engine was used. Sound power was measured under anechoic conditions for eight separate parts of the engine at steady state operating conditions using the conventional technique. Sound power measurements were repeated on five separate parts of the engine using the surface intensity at the same steady state operating conditions. The results were compared by plotting sound power level against frequency and noise source rankings for the two methods.
- Presented at the 99TH Acoust. Soc. Of AM. Meeting, Atlanta, 21-25 Apr. 1980.
Langley Research CenterNational Aeronautics and Space Administration
Hampton, VA United States 23665
- Mcgary, M C
- Crocker, M J
- Publication Date: 1980-4
- Pagination: 18 p.
- TRT Terms: Acoustic measuring instruments; Acoustics; Anechoic chambers; Diesel engines; Engines; Frequency (Electromagnetism); Frequency distributions; Loudness; Noise; Noise control; Noise sources; Power spectra; Sound level; Texture
- Old TRIS Terms: Acoustic measurement; Acoustic measurements; Diesel engine noise; Engine noise; Frequency ranges; Noise attenuation; Noise intensity
- Subject Areas: Environment; Highways; Railroads; Vehicles and Equipment;
- Accession Number: 00318307
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-TM-81807
- Files: TRIS
- Created Date: Sep 16 1980 12:00AM