This report presents the three-phase program to design, fabricate, test, and demonstrate economical and practical methods of reducing noise levels on underground coal mining portal buses (mantrip vehicles). The noise-control treatments applied to a production-model portal bus were: wheel-rail vibrations were isolated from the vehicle frame by inserting elastomeric materials between suspension components, vibration-induced noise was reduced by replacing all large sheet metal panels, except floor plates, with damped steel panels, motor noise was reduced by tight-fitting covers made from damped steel and lined with sound-absorbing material and elastomeric motor mounts, and the standard spur gears used in the traction drive system were replaced with helical gearsets. The program reduced the average sound level to below 85 dbA for typical operating conditions.
Integration of Quieting Technology into New Mantrip Vehicles
1981
165 pages
Report
Keine Angabe
Englisch
Mineral Industries , Noise Pollution & Control , Human Factors Engineering , Mine cars , Passenger transportation , Noise reduction , Underground mines , Coal mines , Noise pollution , Motor noise , Vehicle wheels , Railroad tracks , Damping , Acoustic measurement , Human factors engineering , Noise source , Wheel rail interactions , Diagnostic tests
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