Effects of postural and methodological changes on equal comfort contours for whole body, vertical, sinusoidal vibration

Jones, A.J.; Saunders, D.J.

doi:10.1016/0003-682x(72)90031-x

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…Equivalent sensation contour corresponding to magnitude estimate '140' in the present experiment ; Equivalent sensation contour corresponding to magnitude estimate '100' in Thuong and Griffin [12]. : Miwa [8]; : Miwa [17]; : Oborne and Clarke [7]; : Ashley [6]; : Jones and Saunders [5]; : Jones and Saunders [5]; : Chaney [4] ("perceptible"). Fig.…”

Section: Acknowledgementsmentioning

confidence: 97%

“…Equivalent-sensation contours have previously been constructed for standing people exposed to vertical vibration by Chaney [4], Jones and Saunders [5]), Ashley [6], Oborne and Clarke [7] and Miwa [8], and are compared with the equivalent comfort contours from the present study in Fig. 8.…”

Section: Figure 7 About Herementioning

confidence: 99%

“…When magnitude estimation is used, subjects are exposed to motion stimuli and asked to report the magnitude of discomfort associated with them, generally using numbers (sometimes, relative to the discomfort of a reference motion) or semantic labels. For the vertical vibration of standing people, equivalent comfort contours have been constructed from experimental studies employing a variety of experimental methods over various frequency ranges: magnitude production with a semantic scale, 1-27 Hz [4]; magnitude 4 production using a reference motion, 4-80 Hz [5]; method of adjustment with a random reference motion, 0.7-20 Hz [6]; magnitude estimation using numbers without a reference motion, 3-80 Hz [7]; magnitude production using a reference motion, 0.5-300 Hz [8]. Using a similar method and frequency range, Miwa [8] also constructed equivalent comfort contours for standing people exposed to horizontal vibration.…”

Section: Introductionmentioning

confidence: 99%

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The vibration discomfort of standing persons: 0.5–16-Hz fore-and-aft, lateral, and vertical vibration

Thuong

Griffin

2011

Journal of Sound and Vibration

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To minimise the discomfort of standing people caused by vibration of a floor, it is necessary to know how their sensitivity to vibration depends on the frequency of the vibration. This study was designed to determine how the discomfort of standing people exposed to horizontal and vertical vibration depends on vibration frequency over the range 0.5 to 16 Hz. Using the method of magnitude estimation, sixteen subjects judged the discomfort caused by fore-and-aft, lateral, and vertical sinusoidal vibration at each of the sixteen preferred one-third octave centre frequencies from 0.5 to 16 Hz at each of nine magnitudes. Subjects also reported the main cause of their discomfort.Equivalent comfort contours were constructed, reflecting the effect of frequency on subject sensitivity to vibration acceleration. With horizontal vibration, at frequencies between 0.5 and 3.15 Hz the discomfort was similar when the vibration velocity was similar, whereas at frequencies between 3.15 Hz and 16 Hz the discomfort was similar when the vibration acceleration was similar. At frequencies less than 3.15 Hz, the subjects experienced problems with their stability, whereas at higher frequencies vibration discomfort was mostly experienced from sensations in the legs and feet. With vertical vibration, discomfort was felt in the lower-body and upper-body at all frequencies. The frequency weightings in current standards for predicting the vibration discomfort of standing persons have been greatly influenced by the findings of studies with seated subjects: the weightings are consistent with the experimentally-determined frequency-dependence of discomfort caused by vertical vibration but inconsistent with the experimentally-determined frequency-dependence of discomfort caused by horizontal vibration. The results suggest that the responses of seated and standing people are similar for vertical vibration, but differ for horizontal vibration, partly due to greater instability in standing persons.

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Section: Acknowledgementsmentioning

confidence: 97%

Section: Figure 7 About Herementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The vibration discomfort of standing persons: 0.5–16-Hz fore-and-aft, lateral, and vertical vibration

Thuong

Griffin

2011

Journal of Sound and Vibration

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“…Although this additional input did not greatly change the acceleration required to produce similar overall discomfort to that with no backrest (Figure 6b), there was a tendency for the backrest to increase perception of vibration in the upper-body (upper back, shoulder, neck and head: Figure 7a and 7b) and increase discomfort at frequencies greater than 8 Hz ( Figure 6). Previous studies have produced equivalent comfort contours for whole-body vertical vibration of seated people with a backrest (Shoenberger and Harris, 1971;Oborne and Boarer, 1982, Donati et al, 1983, Corbridge and Griffin, 1986) and without a backrest (Miwa, 1967;Jones and Saunders, 1972;Dupuis et al, 1972;Griffin, 1976;Griffin et al, 1982;Morioka and Griffin, 2006), as shown in Figure 8. Differences between contours obtained with and without backrest seem to become apparent at frequencies greater than about 8 Hz: with a backrest, the contours tend to be lower, indicating a lower magnitude of vibration is required to cause similar discomfort (i.e.…”

Section: Effect Of the Backrestmentioning

confidence: 98%

“…Studies of the discomfort caused by the wholebody vertical vibration of people seated with no backrests have shown a strong dependence on the frequency of the vibration (e.g., Miwa, 1967;Jones and Saunders, 1972;Dupuis et al, 1972;Griffin et al, 1982;Morioka and Griffin, 2006). Studies of physical responses (e.g., apparent mass, mechanical impedance, transmissibility) to whole-body vertical vibration when sitting with no backrest also show a strong dependence on the frequency of the vibration (e.g.…”

Section: Introductionmentioning

confidence: 99%

Predicting discomfort from whole-body vertical vibration when sitting with an inclined backrest

Basri

Griffin

2013

Applied Ergonomics

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Current methods for evaluating seat vibration to predict vibration discomfort assume the same frequency weightings and axis multiplying factors can be used at the seat surface and the backrest irrespective of the backrest inclination. This experimental study investigated the discomfort arising from whole-body vertical vibration when sitting on a rigid seat with no backrest and with a backrest inclined at 0 (upright), 30, 60, and 90 (recumbent). Within each of these five postures, 12 subjects judged the discomfort caused by vertical sinusoidal whole-body vibration (at frequencies from 1 to 20 Hz at magnitudes from 0.2 to 2.0 ms -2 r.m.s.) relative to the discomfort produced by a reference vibration (8 Hz at 0.4 ms -2 r.m.s.). With 8-Hz vertical vibration, the subjects also judged vibration discomfort with each backrest condition relative to the vibration discomfort with no backrest. The locations in the body where discomfort was experienced were determined for each frequency at two vibration magnitudes.Equivalent comfort contours were determined for the five conditions of the backrest and show how discomfort depends on the frequency of vibration, the presence of the backrest, and the backrest inclination. At frequencies greater than about 8 Hz, the backrest increased vibration discomfort, especially when inclined to 30, 60, or 90, and there was greater discomfort at the head or neck. At frequencies around 5 and 6.3 Hz there was less vibration discomfort when sitting with an inclined backrest.

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References

1990

Handbook of Human Vibration

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Effects of postural and methodological changes on equal comfort contours for whole body, vertical, sinusoidal vibration

Cited by 10 publications

References 8 publications

The vibration discomfort of standing persons: 0.5–16-Hz fore-and-aft, lateral, and vertical vibration

The vibration discomfort of standing persons: 0.5–16-Hz fore-and-aft, lateral, and vertical vibration

Predicting discomfort from whole-body vertical vibration when sitting with an inclined backrest

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