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Journal of the acoustical society of America
602
HUMAN
RESPONSE
TO
VIBRATION
L,, dB(A) level was the noise measure most closely associated with subjective site median vibration nuisance ratings, accounting for about half the variance in the median ratings. However, a number of other noise measures were only slightly less well correlated and so no preferred noise index can be determined simply on the basis of the rank order of the correlation coefficients. Respondents considered large lorries to be the major cause of building vibration and concern about the possibility of building damage caused by traffic vibration was an important reason for being bothered by vibration. Topics: Buildings ; Vibration Measurements (Buildings) ; Ride (Buildings) ; Subjective Assessment (General) ; Combined Stress ( Vibration and Noise). G. R. Barnes 1983 Experimental Brain Research 49, 257-268. The effects of retinal target location on suppression of the vestibulo-ocular reflex. (12 pages, 8 figures, 1 table, 52 references) Author’s Abstract. Experiments on human subjects exposed to angular oscillation whilst viewing a head-fixed display have indicated that the degree of suppression of the vestibuloocular reflex is dependent upon the peripheral location of the visual target. Suppression is greatest when fixating a central target and decreases in a graded manner for targets placed more peripherally. During central fixation a low-velocity nystagmus is still evident and there is no indication of any complete cancellation of the vestibulo-ocular reflex. Topics: Perceptual Mechanisms (Vision, Vestibular). K. Kiramatsu and M. J. Griffin 1984 Journal of the Acoustical Society of America 76 (4), 1080-1089. Predicting the subjective response to nonsteady vibration based on the summation of subjective magnitude. (10 pages, 11 figures, 3 tables, 11 references) Authors’ Abstract. A purpose of this study was to determine the values of exponents of psychophysical functions for the discomfort produced by whole-body vertical vibration. In addition, the applicability of a method of predicting the average stimulus intensity of a stimulus the intensity of which varies with time was investigated. The first experiment investigated the effect on discomfort of the duration of vibration (for durations of 2, 5, 10, 20 and 50s) and of the vibration acceleration magnitude [for O-5, 0.75, 1.11, 1.67 and 2.5 ms-* (rms) at 8 Hz]. The magnitude estimation method was used. The results show that the logarithm of the magnitude estimation is in linear proportion to both the logarithm of the acceleration and the logarithm of the duration. The values of exponents for acceleration and duration were O-96 and 0.56, respectively. In the second experiment, the point of subjective equality of each of 16 non-steady vibrations was measured and compared with the stimulus intensity predicted by means of the method proposed by the authors. Good agreement was found between the measured and predicted stimulus intensity and it was confirmed that the prediction method could be applied to vibration as well as to noise. Topics: Subjective Assessment (Magnitude Estimation); Exposure Time: Complex Vibration (Impulses). I. Hirosawa 1983 International Archives of Occupational and Environmental Health 52, 209-214. Original construction of thermo-esthesiometer and its application to vibration disease. (6 pages, 3 figures, 1 table, 6 references) Author’s Abstract. A thermo-esthesiometer was devised for the investigation of sensory disorders among operators of vibration tools. Moreover, its usefulness for diagnosis was investigated. The esthesiometer was composed of a copper pipe 80 cm long that was heated at one end with an electric heater and chilled at the other end with a cooling mixture of NaCl and ice. The temperature at each point of the copper pipe was measured
HUMAN
RESPONSE
TO
VIBRATION
L,, dB(A) level was the noise measure most closely associated with subjective site median vibration nuisance ratings, accounting for about half the variance in the median ratings. However, a number of other noise measures were only slightly less well correlated and so no preferred noise index can be determined simply on the basis of the rank order of the correlation coefficients. Respondents considered large lorries to be the major cause of building vibration and concern about the possibility of building damage caused by traffic vibration was an important reason for being bothered by vibration. Topics: Buildings ; Vibration Measurements (Buildings) ; Ride (Buildings) ; Subjective Assessment (General) ; Combined Stress ( Vibration and Noise). G. R. Barnes 1983 Experimental Brain Research 49, 257-268. The effects of retinal target location on suppression of the vestibulo-ocular reflex. (12 pages, 8 figures, 1 table, 52 references) Author’s Abstract. Experiments on human subjects exposed to angular oscillation whilst viewing a head-fixed display have indicated that the degree of suppression of the vestibuloocular reflex is dependent upon the peripheral location of the visual target. Suppression is greatest when fixating a central target and decreases in a graded manner for targets placed more peripherally. During central fixation a low-velocity nystagmus is still evident and there is no indication of any complete cancellation of the vestibulo-ocular reflex. Topics: Perceptual Mechanisms (Vision, Vestibular). K. Kiramatsu and M. J. Griffin 1984 Journal of the Acoustical Society of America 76 (4), 1080-1089. Predicting the subjective response to nonsteady vibration based on the summation of subjective magnitude. (10 pages, 11 figures, 3 tables, 11 references) Authors’ Abstract. A purpose of this study was to determine the values of exponents of psychophysical functions for the discomfort produced by whole-body vertical vibration. In addition, the applicability of a method of predicting the average stimulus intensity of a stimulus the intensity of which varies with time was investigated. The first experiment investigated the effect on discomfort of the duration of vibration (for durations of 2, 5, 10, 20 and 50s) and of the vibration acceleration magnitude [for O-5, 0.75, 1.11, 1.67 and 2.5 ms-* (rms) at 8 Hz]. The magnitude estimation method was used. The results show that the logarithm of the magnitude estimation is in linear proportion to both the logarithm of the acceleration and the logarithm of the duration. The values of exponents for acceleration and duration were O-96 and 0.56, respectively. In the second experiment, the point of subjective equality of each of 16 non-steady vibrations was measured and compared with the stimulus intensity predicted by means of the method proposed by the authors. Good agreement was found between the measured and predicted stimulus intensity and it was confirmed that the prediction method could be applied to vibration as well as to noise. Topics: Subjective Assessment (Magnitude Estimation); Exposure Time: Complex Vibration (Impulses). I. Hirosawa 1983 International Archives of Occupational and Environmental Health 52, 209-214. Original construction of thermo-esthesiometer and its application to vibration disease. (6 pages, 3 figures, 1 table, 6 references) Author’s Abstract. A thermo-esthesiometer was devised for the investigation of sensory disorders among operators of vibration tools. Moreover, its usefulness for diagnosis was investigated. The esthesiometer was composed of a copper pipe 80 cm long that was heated at one end with an electric heater and chilled at the other end with a cooling mixture of NaCl and ice. The temperature at each point of the copper pipe was measured