Vibratory Sensation Induced by Low-Frequency Noise: The Threshold for “Vibration Perceived in the Head” in Normal-Hearing Subjects

Takahashi, Yukio

doi:10.1260/0263-0923.32.1-2.1

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…The high truck traffic load of the area suggests the importance of LF assessment. Large parts of this LF-component may have been caught by the question on vibration perception [83,84,85]. …”

Section: Discussionmentioning

confidence: 99%

Community Response to Multiple Sound Sources: Integrating Acoustic and Contextual Approaches in the Analysis

Coensel

Dekonink

Botteldooren

2017

IJERPH

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Sufficient data refer to the relevant prevalence of sound exposure by mixed traffic sources in many nations. Furthermore, consideration of the potential effects of combined sound exposure is required in legal procedures such as environmental health impact assessments. Nevertheless, current practice still uses single exposure response functions. It is silently assumed that those standard exposure-response curves accommodate also for mixed exposures—although some evidence from experimental and field studies casts doubt on this practice. The ALPNAP-study population (N = 1641) shows sufficient subgroups with combinations of rail-highway, highway-main road and rail-highway-main road sound exposure. In this paper we apply a few suggested approaches of the literature to investigate exposure-response curves and its major determinants in the case of exposure to multiple traffic sources. Highly/moderate annoyance and full scale mean annoyance served as outcome. The results show several limitations of the current approaches. Even facing the inherent methodological limitations (energy equivalent summation of sound, rating of overall annoyance) the consideration of main contextual factors jointly occurring with the sources (such as vibration, air pollution) or coping activities and judgments of the wider area soundscape increases the variance explanation from up to 8% (bivariate), up to 15% (base adjustments) up to 55% (full contextual model). The added predictors vary significantly, depending on the source combination. (e.g., significant vibration effects with main road/railway, not highway). Although no significant interactions were found, the observed additive effects are of public health importance. Especially in the case of a three source exposure situation the overall annoyance is already high at lower levels and the contribution of the acoustic indicators is small compared with the non-acoustic and contextual predictors. Noise mapping needs to go down to levels of 40 dBA,Lden to ensure the protection of quiet areas and prohibit the silent “filling up” of these areas with new sound sources. Eventually, to better predict the annoyance in the exposure range between 40 and 60 dBA and support the protection of quiet areas in city and rural areas in planning sound indicators need to be oriented at the noticeability of sound and consider other traffic related by-products (air quality, vibration, coping strain) in future studies and environmental impact assessments.

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Section: Discussionmentioning

confidence: 99%

Community Response to Multiple Sound Sources: Integrating Acoustic and Contextual Approaches in the Analysis

Coensel

Dekonink

Botteldooren

2017

IJERPH

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“…It appears that rotational traumatic brain injury because of "shearing of brain tissues occurs mainly in the higher frequency modes while translational brain injury occurs in the lower frequency modes". 24 Most of the published documents showed frequency spectrum of human head using traditional frequency extraction approach ignoring the influence of damping. As previously noted, three damps factors are involved in this complex eigenvalue problem.…”

Section: Discussionmentioning

confidence: 99%

Frequency spectrum of the human head–neck to mechanical vibrations

Shi

Wang

Xiao

et al. 2017

Journal of Low Frequency Noise, Vibration and Active Control

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This study is based on a real finite element human head-neck model and concentrates on its numerical vibration characteristic. Frequency spectrum and mode shapes of the finite element model of human head-neck under mechanical vibration have been calculated. These vibration characteristics are in good agreement with the previous studies. The simulated fundamental frequency of 35.25 Hz is fairly similar to the published documents, and rarely reported modal responses such as "mastication" and flipping of nasal lateral cartilages modes, however, are introduced by our threedimensional modal analysis. These additional modes may be of interest to surgeons or clinicians who are specialized in temporomandibular or rhinoplasty joint disorder. Modal validation in terms of modal shapes proposes a necessity for elaborate modeling to identify each individual part's extra frequencies. Furthermore, it also studies the influence of damping on resonant frequencies and biomechanical responses. It is discovered that damping has an inverse proportionality between damping effect on natural frequency and that on biomechanical responses.

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“…Furthermore, the observed presence of strong low frequency components can induce further vibration perceptions through cross-modality interactions [78,79]. Such cross-over effects are not covered in typical "mono-sensory" guideline assessments, where primary and secondary airborne sound and ground vibration effects are assessed separately.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Psychoacoustic and Vibration-Related Parameters to Track the Reasons for Health Complaints after the Introduction of New Tramways

Cik

Lienhart

2016

Applied Sciences

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Abstract:Background: A change to new tramways in Graz (Austria) led to severe complaints in residential areas. To understand the underlying reasons for these complaints, a systematic measurement campaign was designed. Methods: Six locations in Graz and two locations in a comparably sized city were selected. Parallel indoor recordings of sound and vibrations were conducted from 8:00 p.m. to 8:00 a.m. (due to sleep problems) at all locations. Results: Vibration levels remained below the limits of the Austrian standard (Wm-weighting) although variability was observed among sites, tram types and pass-bys. A complex characteristic of the acoustic feature space was found with A-weighting (differences between A-and C-weighting of more than 15 dB were observed). C-weighted background to peak noise ratios clearly distinguished "old" from "new" trams. Psychoacoustic indices indicated a high variability between locations and tram types. Roughness and loudness was higher in "new" versus "old" trams at most locations. "New" trams exhibited high sharpness values and variability, especially at higher speeds-when compared with trams from a control city. Conclusions: Standard indicators of sound and vibration were not sensitive enough to uncover the reasons for the complaints. Only the integrated analysis of the ambient soundscape (high signal-to-noise-ratio), the more noticeable sound (in psychoacoustic terms) and the observed high variance of the immissions provided guidance to implement appropriate technical solutions.

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Vibratory Sensation Induced by Low-Frequency Noise: The Threshold for “Vibration Perceived in the Head” in Normal-Hearing Subjects

Cited by 12 publications

References 8 publications

Community Response to Multiple Sound Sources: Integrating Acoustic and Contextual Approaches in the Analysis

Community Response to Multiple Sound Sources: Integrating Acoustic and Contextual Approaches in the Analysis

Frequency spectrum of the human head–neck to mechanical vibrations

Analysis of Psychoacoustic and Vibration-Related Parameters to Track the Reasons for Health Complaints after the Introduction of New Tramways

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