||An evaluation of high level noise and its reduction in a 3000 BTU/HR gasoline-engine-powered field refrigeration unit.
|| Defense Technical Information Center,
||USAMC-ITC-02-08-75-403; AD-A009 314
Air Condition, Heating, Lighting & Ventilating. ;
Civil Engineering. ;
Noise reduction. ;
Engine noise. ;
Refrigeration systems. ;
High intensity. ;
Sound pressure. ;
Electric motors. ;
Sound analyzers. ;
Acoustic insulation. ;
||Research Triangle Park Library/RTP, NC
"AD-A009 314." "USAMC-ITC-02-08-75-403." "Filmed 6-5-75 NTIS." Microfiche.
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.