Equivalent-Continuous Noise Level as a Measure of Injury from Impact and Impulse Noise

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Abstract
An expression is given from which ‘equivalent-continuous noise level’ in A-weighted sound level can be calculated for impact and certain types of impulse noise. For this calculation knowledge is required of three quantities; the peak height, the repetition rate and the decay-time constant of the waveform envelope. Results from a study of drop-forging are used to show that values of equivalent-continuous noise level can be used to calculate the cumulative frequency-weighted sound energy (immission). Hearing tests on drop-forgers show that these calculated immissions can be used to predict the men's hearing levels when used in an expression which relates continuous noise to injury. The view is stated that equivalent-continuous noise level for a typical working day may safely be used to calculate immission and hence risk of injury to hearing for noise of any type. Methods for the derivation of equivalent-continuous noise level are discussed.

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