Comparative analysis on noise continuous and instantaneous sampling
Chao Zhang, PO Box · 2000
Objective To compare and analyse the results of continuous and instantaneous sampling of industrial noise.Methods Some noisy types of work in machinery processing such as air compressoring, wood cutting, riveting, metal cutting, piercering and forging were chosen to measure the noise. Steady noise (dBA) and unsteady noise (LeqA) were instantaneously sampled with HS5660 sound level meter and continuously sampled with NL 2 personal sound level meter respectively.Results Steady or sub steady noise was basically in the same level in air compressoring and wood cutting,while pulse noise measured with the HS5660 was 6.3～12.5 dBA higher than LeqA with the NL 2. It was showed that the noise level was consistent with the type of work measured with the NL 2. Aperiodic instantaneous sampling in the same type of work demonstrated that the difference of the results related to the steady state of the noise.Conclusion The steady state of the noise could be reflected by the standard error of repetitious instantaneous sampling and expressed as ±s . Compared with the instantaneous sampling, the result of personal continuous sampling was much accurate and objective, although NL 2 itself needs improving.