A study of the noise conditions in the Rotary Testing Laboratory at the Mining Research and Development Establishment, Bretby

A detailed survey of the noise levels within the laboratory was made during the months of May, June and July 1970. The average exposure of individual workers was estimated from observations of their work programme, A prediction of the expected hearing loss of the men in the absence of hearing protection was calculated.Reduction of the noise at source in the main laboratory might be achieved by design features in the machinery under test. This is the responsibility of the individual manufacturers and should be brought to their attention. Transmission of noise through the structural members of the floor could be reduced by the use of vibration damping alloys. It is impractical to reduce air transmission in the laboratory by enclosing individual items of machinery.The noise level in the enclosed engine testing cells within the main laboratory could be reduced by suitable changes in their design. Specific proposals for these changes are made.Since major reductions in the noise levels in the main laboratory cannot easily be achieved it is recommended that the men wear hearing defenders. Their use is only necessary when the noise reaches a dangerous intensity. It is pointed out that the main difficulty in the adaption of such a system is in ensuring that the men appreciate the fact that the noise has reached a high level. Instruction on the subject should be given to the staff at an early stage. A system which will give visual warning of dangerous noise levels should be installed. “”