Measurement of Human Body Surface Vibrations Induced by Complex Low-Frequency Noise Composed of Two Pure Tones

Takahashi, Yukio; Maeda, S.

doi:10.1260/026309203323022580

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…When a person is exposed to high-level low-frequency noise, actual body vibration is induced [19][20][21] . The levels of this vibration (noise-induced vibration) are not especially high, but we found that noise-induced vibrations measured on the chest or abdomen were closely related to vibratory sensation perceived in each corresponding part of the body 22) .…”

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confidence: 99%

A Study on the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-level Low-frequency Pure Tones

et al. 2005

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Human body surface vibrations induced by high-level low-frequency pure tones were measured at the chest and the abdomen. At the same time, the subject rated the unpleasantness that he had just perceived during the exposure to low-frequency noise stimulus. Examining the relationship between the measured vibration and the rating score of the unpleasantness revealed that the unpleasantness was in close correlation with the vibration acceleration level (VAL) of the vibration measured. Taking previous results into account, this finding suggests that noise-induced vibrations primarily induce vibratory sensations and through the vibratory sensation or together with some other factors, secondarily contribute to the unpleasantness. The present results suggest that in evaluating high-level low-frequency noise, the effect of vibration should be taken into account.

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Section: Introductionmentioning

confidence: 99%

A Study on the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-level Low-frequency Pure Tones

et al. 2005

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A Consideration of the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-Level, Complex Low-Frequency Noise

Takahashi

2006

Journal of Low Frequency Noise, Vibration and Active Control

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To investigate the relationship between subjective unpleasantness and body surface vibrations induced by high-level, complex low-frequency noise, we carried out two expetiments. Body surface vibrations were measured at the right and left anterior chest and the right and left anterior abdomen of male subjects. Subjective unpleasantness was rated on a scale of 1 to 5, and correlated with the vibration acceleration levels (VALs) of the vibrations measured on the body surface. As a result, it was found that the ratings of unpleasantness did, on the whole, significantly correlate with the VALs. In addition, we estimated the frequency-weightings for the VAL to optimize the correlation with the rating of unpleasantness. Based on a reasonable hypothesis, the frequency-weightings estimated in the present study were considered to be consistent with those estimated in our previous study using low-frequency pure tones. The present results support the idea that not only the loudness of a noise, but also the vibrations induced by that noise, contribute to the subjective unpleasantness experienced by persons exposed to high-level low-frequency noise. The effect of vibration should be taken into consideration in evaluating high-level low-frequency noise.

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A Consideration of an Evaluation Index for High-Level Low-Frequency Noise by Taking into Account the Effect of Human Body Vibration

Takahashi

Harada

2007

Journal of Low Frequency Noise, Vibration and Active Control

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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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Measurement of Human Body Surface Vibrations Induced by Complex Low-Frequency Noise Composed of Two Pure Tones

Cited by 4 publications

References 14 publications

A Study on the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-level Low-frequency Pure Tones

A Study on the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-level Low-frequency Pure Tones

A Consideration of the Relationship between Subjective Unpleasantness and Body Surface Vibrations Induced by High-Level, Complex Low-Frequency Noise

A Consideration of an Evaluation Index for High-Level Low-Frequency Noise by Taking into Account the Effect of Human Body Vibration

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