Predicting the discomfort caused by simultaneous vertical and fore-and-aft whole-body vibration

Fairley, Thomas E.; Griffin, Michael J.

doi:10.1016/s0022-460x(88)81410-x

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…Experiments have explored the relative discomfort caused by different directions of vibration at the same location [12,18,19]. This has made it possible to adjust the weightings from equivalent comfort contours so that, after weighting (by both frequency and direction) a weighted vibration has a magnitude representative of the likely discomfort.…”

Section: Weightings For the Direction Of Vibrationmentioning

confidence: 99%

Discomfort from feeling vehicle vibration

Griffin

2007

Vehicle System Dynamics

187

102

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Vehicle refinement should include a consideration of the discomfort likely to be caused by vibration. This paper reviews the measurement, the evaluation, and the assessment of vehicle vibration felt by drivers and passengers.The feeling of vibration that gives rise to judgements of vibration discomfort can be predicted using evaluation procedures that take account of human sensitivity to different magnitudes, frequencies, directions, and durations of vibration. The evaluation methods make it possible to optimise vehicles via dynamic modelling before the production of prototypes and they assist the testing and optimisation of prototypes and production vehicles.Vibration evaluation provides imperfect predictions of discomfort when driver or passenger opinion is influenced by factors other than the vibration that is being measured and evaluated. Vibration evaluation can detect changes that are not detectable subjectively since smaller changes can be detected by measurement and evaluation than by subjective assessment.

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Section: Weightings For the Direction Of Vibrationmentioning

confidence: 99%

Discomfort from feeling vehicle vibration

Griffin

2007

Vehicle System Dynamics

187

102

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“…Studies on the subjective response to vibration which have considered multi-axis vibration have usually only considered two axes of vibration at any one time, have only considered single frequency vibration (sinusoids), and have generally used the method of adjustment psychophysical method (e.g. Griffin and Whitham, 1977;Fairley and Griffin, 1988;Shoenberger, 1987;Shoenberger 1988;Mistrot et al 1990;Griefahn and Brode, 1999;Mansfield and Maeda, 2005;Forta et al 2008). The methods for evaluating the subjective response of the seated person to complex multi-axis stimuli still require validation such that the boundaries of their applicability can be established.…”

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confidence: 99%

Subjective ratings of whole-body vibration for single- and multi-axis motion

Mansfield

Maeda²

2011

The Journal of the Acoustical Society of America

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If evaluating vibration with respect to human response, most investigators will use methods defined in ISO 2631-1. This uses frequency weightings that were originally derived from laboratory studies of the subjective responses to vibration in one direction at a time. This paper describes experiments carried out using a 6 degree-of-freedom vibration simulator to validate the applicability of ISO 2631-1 in multi-axis environments.15 subjects were exposed to 87 stimuli comprising single-axis, dual-axis and tri-axial random vibration, to which they were required to produce subjective ratings. It is shown that in this study the root-sum-of-squares method of summation of subjective ratings in individual axes was an adequate technique for prediction of subjective rating of multiaxis vibration. Better agreement between objective and subjective measures of vibration was obtained for unweighted vibration than for frequency weighted signals.The best agreement for this study was achieved when axis multiplying factors were set at 2.2 and 2.4 for x-and y-axis vibration respectively. Different values could be appropriate for other postures, seats, and vibration conditions and should be determined in future studies.

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“…Some studies have explored the discomfort of seated people exposed to non-vertical vibration (e.g., Griffin et al, 1982;Morioka and Griffin, 2006), and some have investigated methods of predicting the vibration discomfort of standing people Griffin, 2011a,b,c, 2012). A few studies have investigated the discomfort caused by dual-axis vibration (e.g., Griffin and Whitham, 1977;Fairley and Griffin, 1988;Mistrot et al, 1990;Griefahn and Brode, 1999) but there are no known systematic investigations of methods of predicting the discomfort caused by the tri-axial vibration of either seated or standing people.…”

Section: Introductionmentioning

confidence: 99%

“…The findings suggest that the discomfort caused by multi-axis vibration can be predicted from the square-root of the sums of the squares of the components in each axis, weighted according to their individual contributions to discomfort (e.g., Griffin and Whitham, 1977;Fairley and Griffin, 1988;Mistrot et al, 1990;Griefahn and Brode, 1999). This is the basis for British Standard 6841 (1987) and International Standard 2631-1 (1997) recommending the calculation of the root-sum-ofsquares when evaluating the severity of multi-axis vibration.…”

Section: Introductionmentioning

confidence: 99%

“…A different approach was taken by Fairley and Griffin (1988) who predicted the discomfort of seated subjects exposed to dual-axis (fore-and-aft and vertical) vibration from the discomfort (i.e., the subjective magnitudes) caused by the two component motions rather than from their physical magnitudes, and assumed a power summation method could be used to predict the discomfort, similar to Equation (1). The optimal exponent was found to be around 2, with no large difference when the vibration frequency varied from 2.5 Hz to 10 Hz.…”

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confidence: 99%

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The vibration discomfort of standing people: evaluation of multi-axis vibration

Thuong

Griffin

2015

Ergonomics

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Few studies have investigated discomfort caused by multi-axis vibration and none has explored methods of predicting the discomfort of standing people from simultaneous fore-and-aft, lateral, and vertical vibration of a floor. Using the method of magnitude estimation, 16 subjects estimated their discomfort caused by dual-axis and tri-axial motions (octave-bands centred on either 1 Hz or 4 Hz with various magnitudes in the fore-and-aft, lateral, and vertical directions) and the discomfort caused by single-axis motions. The method of predicting discomfort assumed in current standards (square-root of the sums of squares of the three components weighted according to their individual contributions to discomfort) provided reasonable predictions of the discomfort caused by multi-axis vibration. Improved predictions can be obtained for specific stimuli, but no single simple method will provide accurate predictions for all stimuli because the rate of growth of discomfort with increasing magnitude of vibration depends on the frequency and direction of vibration. Practitioner summary (<50 words)Useful estimates of the vibration discomfort of standing people can be obtained from the root-sums-of squares of the floor acceleration in each of the three directions (fore-andaft, lateral, and vertical) if the three components are frequency-weighted according to the dependence of discomfort on the frequency of vibration in each axis.

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Predicting the discomfort caused by simultaneous vertical and fore-and-aft whole-body vibration

Cited by 21 publications

References 9 publications

Discomfort from feeling vehicle vibration

Discomfort from feeling vehicle vibration

Subjective ratings of whole-body vibration for single- and multi-axis motion

The vibration discomfort of standing people: evaluation of multi-axis vibration

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