Zusammenfassung
At high sound pressure levels, actual body vibrations (noise-induced
vibrations) are induced by low-frequency noise. The purpose of this
trial study was to show that considering the effects of noise-induced
vibration is effective in evaluating high-level low-frequency noise.
Using the A-weighted sound pressure level and the Wk-weighted vibration
acceleration level of noise-induced vibration measured on the chest
as independent variables, empirical evaluation indices (HLLF1, HLLF2
and HLLF3) for evaluating the unpleasantness caused by high-level
low-frequency noise were estimated. The HLLF indices were found to
be able to evaluate the unpleasantness caused by high-level low-frequency
noise better than the A-weighted pressure level. In addition, the
slopes of tentative frequency-weighting characteristics corresponding
to the HLLF indices were estimated to be gentler than that of the
A-weighting characteristic within 25-50 Hz, which was consistent
with many previous results that indicated that noise content at lower
frequencies should be given more importance when evaluating low-frequency
noise Although there are several areas where the HLLF index needs
to be improved before it is put in practical use, the results of
this study suggest that high-level low-frequency noise could be more
effectively evaluated by taking into account the effect of human
body vibration.
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