| Main Title |
An evaluation of high level noise and its reduction in a 3000 BTU/HR gasoline-engine-powered field refrigeration unit. |
| Other Authors |
|
| Publisher |
Defense Technical Information Center, |
| Year Published |
1975 |
| Report Number |
USAMC-ITC-02-08-75-403; AD-A009 314 |
| OCLC Number |
907643936 |
| Subjects |
Air Condition, Heating, Lighting & Ventilating ;
Civil Engineering ;
Noise reduction ;
Engine noise ;
Refrigeration systems ;
Sources ;
Measurement ;
Fans ;
High intensity ;
Sound pressure ;
Electric motors ;
Sound analyzers ;
Acoustic insulation ;
Compressor noise
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EKBD |
AD-A009 314 |
Microfiche collection |
Research Triangle Park Library/RTP, NC |
04/27/2015 |
|
| Collation |
73 pages. |
| Notes |
"AD-A009 314." "USAMC-ITC-02-08-75-403." "Filmed 6-5-75 NTIS." Microfiche. |
| Contents Notes |
The report describes the results of research intended to determine the sources of high level airborne noise transmitted from a 3000 BTU/hr mobile refrigeration unit using an air-cooled engine as the prime mover. An electric motor was adapted to power the unit and the major noise producing components of the system (compressor, motor, fan) were analyzed separately to determine their contribution to the overall noise. Noise measurements with a sound level meter and octave band analyzer indicated the gasoline engine to be the major source of high level noise. A significant reduction of noise levels was accomplished by addition of sound suppression materials and relocation of the engine exhaust outlet. Design changes which would further reduce engine noise emission are recommended for future procurement of the mobile refrigeration unit. |
