Abstract
Noise-control techniques applicable to quieting crawler and wheel tractors ranging from 20 to 500 hp were surveyed. Two levels of technology were considered: (1) retrofit technology which did not require major machine modifications and (2) machine redesign. Noise reductions achievable where shown to average 2–6 dBA using retrofit techniques and 6–9 dBA utilizing machine redesign with the larger noise reductions being achieved on lower horsepower machines. Problems associated with machine performance, maintenance, and safety arising from noise-control applications, were investigated and found to be limiting factors in the noise reduction achievable through retrofit techniques. [Work supported in part by EPA.]
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