1,720,981 research outputs found
A comparison of different methods for the evaluation of repeated shocks for assessment of human response
No full textComparison of alternative methods of evaluating whole-body vibration and repeated shocks in vehicles
No full textAn adaptive electro-mechanical model for simulating the driving point force response of the human body with different input motions
No full textVariability in measurements of seat transmissability with an active anthropodynamic dummy and with human subjects
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Predicting the effects of vertical vibration frequency, combinations of frequencies and viewing distance on the reading of numeric displays
No full textThis paper describes a series of experiments to determine the effects of vibration frequency, viewing distance and multiple frequency motions on the reading of numeric characters. Contours of vertical (z-axis) whole-body vibration levels resulting in equal degradation of the reading task were determined over the frequency range 2·8 Hz to 63 Hz. With the seating condition employed, the task was found to be most sensitive to vibration acceleration at a frequency of 11·2 Hz. A marked correlation was observed between reading error and reading speed. The effects of vibration on reading performance were found to be dependent on viewing distance for distance of less than 1·5 m, with the effect increasing as the viewing distance was decreased. The effect of 3·15 Hz vibration was found to increase more rapidly with reductions in viewing distance than that of 16 Hz vibration. The effects of 3·15 and 16 Hz vibration were independent of viewing distance greater than 1·5 m, indicating that the effects of rotational eye motion are dominant at these distances. Four methods were compared for predicting the effects of multiple frequency motion on reading performance given a knowledge of the effect of each component alone. The best predictions of reading error were obtained from the most severe weighted spectral component alone. Inspection of individual subject's data suggests that in many cases the effect of multiple frequency vibration on reading is even less than the effect of the largest sinusoidal component alone.</p
A review of the effects of vibration on visual acuity and continuous manual control, part II: Continuous manual control
No full textThis second, and final, part of a review of the effects of vibration on human performance is concerned with continuous manual control, or tracking. As in the first part, which dealt with the effects of vibration on vision, the task and vibration variables which have been shown to affect the sensitivity of a task to vibration are discussed separately. Other sections are concerned with the measurement of tracking performance in vibration environments, general conclusions about the nature and mechanisms of the effects of vibration on tracking and the application of these conclusions in the form of predictive models. The procedures and results of most of the laboratory studies of vibration and tracking performance are separately summarized in tabular form in the Appendix as a convenient guide to the relevant literature.</p
The use of passive and active anthropodynamic dummies for measuring the vibration isolation provided by vehicle seats
No full textA review of the effects of vibration on visual acuity and continuous manual control, part I: Visual acuity
No full textThis is the first part of a review of the effects of vibration on vision and continuous manual control. In this part experimental research into the effects on human vision of both object vibration and whole-body vibration is summarized. Knowledge of the respective effects of vibration variables (principally amplitude, frequency and direction) and visual task variables (such as illumination, size and viewing distance) is discussed in separate sections. It is shown that while many factors are important and current understanding is far from complete, the literature does contain useful information. The conditions studied in those experiments concerned with the effects of whole-body vibration on vision are tabulated in the Appendix so as to provide a convenient guide to the literature.</p
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