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A scale of human reaction to whole body, vertical, sinusoidal vibration
Jottrnal of Sotmd and Vibration (1973) 31(4), 501-504
HUMAN
RESPONSE TO
VIBRATION
REVIEWS AND ABSTRACTS
Prepared by M. J. Griffin and J. Griffin, Httman Factors Research Unit, hlstitute of Sound attd Vibration Research, University of Southampton, Southampton S09 5NH, England ABSTRACTS The 1973 meeting of the United Kingdom Informal Group on Human Response to Vibration was held at the University of Salford from 17th to 19th September. This month's section of abstracts is devoted solely to a selection of the twenty papers presented at that Conference. A. J. Jones 1973. Paper presented at United Kingdom hformal Group Meeting on Human Response to Vibration, Unir'ersity of Salford, 17th-19th September, 1973. A scale of human reaction to whole body, vertical, sinusoidal vibration. (7 pages, 2 figures, 2 tables, 5 references)
Summar), by M.J.G. This paper describes the use of a relative intensity estimation procedure carried out in order to determine whether subjects are abIe to consistentlyjudge the magnitude of one vibration stimulus in relation to another. From the results a scale ofsubjective response to vibration intensity has been developed. It was found that human reaction could be adequately described by a growth function of the form
y = kX o.93, where Y is the subjective magnitude of vibration, X is the objective magnitude of vibration acceleration and k is a constant. This type of function is commonly referred to as the Stevens Power Law, since S. S. Stevens has proposed its existence for several sensory modalities. The value of the exponent at 0.93 represents that found by pooling all the data for 30 men and 30 women who all adopted an unrestrained sitting position and carried out the experiment at several frequencies of vibration in the range 5 to 80 Hz. The results for each vibration frequency employed could also be satisfactorily described by a power law growth function. Generalized vibration contours and a vibration magnitude scale ha~'e been derived from the data. The author anticipates that when the mechanism of subjective addition of frequency components in a complex vibration is understood these scales may be used to give an overall "vibration level index". Topics: Subjective Assessment (hltensity Matchhtg, )~fagnitttde Esthnation) L. C. Fothergill 1973 Paper presented at United Kingdom htformal Group Meethzg on Htonan Response to Vibration, University of Salford, 17th-19th September, 1973. Psychophysical scaling of human response to whole-body vertical vibration. (9 pages, 3 figures, 2 tables, 6 references)
Author's Abstract. The vibration in many types of transport can be approximated by several sinusoidal components combined with a low level random vibration. A method of assessing the subjective human response to such a vibration has been determined by way of five experiments. In outline, the complex vibration signal is fed through a narrow band analyzer and 501
HUMAN
RESPONSE TO
VIBRATION
REVIEWS AND ABSTRACTS
Prepared by M. J. Griffin and J. Griffin, Httman Factors Research Unit, hlstitute of Sound attd Vibration Research, University of Southampton, Southampton S09 5NH, England ABSTRACTS The 1973 meeting of the United Kingdom Informal Group on Human Response to Vibration was held at the University of Salford from 17th to 19th September. This month's section of abstracts is devoted solely to a selection of the twenty papers presented at that Conference. A. J. Jones 1973. Paper presented at United Kingdom hformal Group Meeting on Human Response to Vibration, Unir'ersity of Salford, 17th-19th September, 1973. A scale of human reaction to whole body, vertical, sinusoidal vibration. (7 pages, 2 figures, 2 tables, 5 references)
Summar), by M.J.G. This paper describes the use of a relative intensity estimation procedure carried out in order to determine whether subjects are abIe to consistentlyjudge the magnitude of one vibration stimulus in relation to another. From the results a scale ofsubjective response to vibration intensity has been developed. It was found that human reaction could be adequately described by a growth function of the form
y = kX o.93, where Y is the subjective magnitude of vibration, X is the objective magnitude of vibration acceleration and k is a constant. This type of function is commonly referred to as the Stevens Power Law, since S. S. Stevens has proposed its existence for several sensory modalities. The value of the exponent at 0.93 represents that found by pooling all the data for 30 men and 30 women who all adopted an unrestrained sitting position and carried out the experiment at several frequencies of vibration in the range 5 to 80 Hz. The results for each vibration frequency employed could also be satisfactorily described by a power law growth function. Generalized vibration contours and a vibration magnitude scale ha~'e been derived from the data. The author anticipates that when the mechanism of subjective addition of frequency components in a complex vibration is understood these scales may be used to give an overall "vibration level index". Topics: Subjective Assessment (hltensity Matchhtg, )~fagnitttde Esthnation) L. C. Fothergill 1973 Paper presented at United Kingdom htformal Group Meethzg on Htonan Response to Vibration, University of Salford, 17th-19th September, 1973. Psychophysical scaling of human response to whole-body vertical vibration. (9 pages, 3 figures, 2 tables, 6 references)
Author's Abstract. The vibration in many types of transport can be approximated by several sinusoidal components combined with a low level random vibration. A method of assessing the subjective human response to such a vibration has been determined by way of five experiments. In outline, the complex vibration signal is fed through a narrow band analyzer and 501