Noise Assessment of Dumpers under Loaded and Empty Conditions

摘要

That the vibration of a body of higher mass will be lower compared to that of a body having lower mass. Therefore, the sound produced by a body of lower mass should be higher than that of a body having higher mass. This principle was used in the present investigation to study the sound level produced by dumpers under loaded and empty conditions. The study revealed the equivalent continuous sound level for dumpers under loaded condition to be lower than that under empty condition. The difference in A -weighted equivalent continuous sound level of all the four dumpers under loaded and empty conditions varied from 0.4 dB to 1.0 dB. The one-third octave band spectrum indicated that loaded dumpers generate 1 dB to 4 dB lower sound levels compared to empty ones at higher midband frequencies greater than 1 kHz. This lowering of sound pressure level at high frequencies for loaded dumpers can be attributed to the higher mass of the vibrating system.