Measures against the noise of an aerial conveyor

On-Site Green Technique (OGT)
Category:Noise and Vibration; Data No.604

Japanese version is here.

Update: July 1996

Among the noises made in a workshop, the aerial conveyor makes the biggest noise, 83dB. The company decided to take measures to reduce it.

By inspecting the apparatus of the aerial conveyor, the company found the following conditions;
The driving motor alone makes noise of 72.3dB itself.
The driving chain was exhausted and a sprocket was worn away.
The rotating part and chain on the side of conveyor smoothly move and do not make very much noise.
Considering the above condition, the company took measures as follows;
Restoration of the apparatus...The chain and the sprocket are respectively swapped with new ones.
Increasing accuracy...Spin finishing of the sprocket and the chain
Adjustment of a position to install a motor
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Reduction by 0.7dB
By dismantling and inspecting the motor gear, the company found that the cause of the noise was the wearing away the inside of the gear.

The noise of the conveyor itself was reduced from 83.0dB to 70.3dB and the whole noise at the workshop was reduced by 1.4dB.

The company decides measuring points around the equipment and establishes methods to reduce the noise source.
The noise is caused by wear and tear of the equipment. Therefore, the company always distinguishes the stereotyped sound to find anomalies in the equipment.