Assessment of random logitudinal and lateral vibration on human body fatigue using a physiological approach

Abstract

Lateral and logitudinal mechanical oscillations occuring during the use of transportation means, constructional machines, and other similar means influence human body fatigue. As a rule, they have random character. Former investigations in this field were mainly based on determination of human body behavior under the influence of harmonic oscillations. Recent studies indicate that man is more 1.5(2)–10(Hz) in the range of sensitive to random oscillations. In this paper an effort is made to define recommendations for estimating random logitudinal and lateral 0.2–30(Hz) oscillations. It was done by examining the human head acceleration when walking, first. Those accelerations were divided with corresponding transfer head-seat function and the curve characteristics were found. On the base of literature data, the ratios between effective value of random logitudinal oscillatory accelerations and time interval up to the occurrence of human body fatigue were defined which enabled plotting of the curves of equal fatigue for logitudinal directions. On the basis of theoretical ratios existing between the lateral and logitudinal accelerations while walking, the corresponding curves of equal fatigue for lateral direction were defined.

Some Aspects of the Investigation of Random Vibration Influence on Ride Comfort

“…In Figures 19 and 20, equivalent comfort curves for one-directional random [10]; ))))))) , ISO 2631-1 (1985) [12]; } } }, Howarth and Gri$n [1]; ----, Leatherwood [18]; *᭺*, Goldman [1]; } ) ) } ) )}, Dupuis et al [1]; -) -) -) -, Donati et al [1]; } ) } ) } ) }, Corbridge and Gri$n [15]; ))))᭝))))), DemicH [19]; *᭝*, Oborne and Boarer [1]. } ) } ) ) } ) } ) ), Gri$n et al [1]; } } }, Donati et al [1]; ----, ISO 2631-1 (1985) [12].…”

Effects of posture and vibration magnitude on seat to head transmissibility during exposure to fore-and-aft vibration

“…1–3 Despite the high magnitudes of horizontal vibration, the biodynamic responses of the seated body to fore-and-aft vibration have been addressed in a few studies. 4–12 Paddan and Griffin 13 reviewed published studies of the transmission of translational seat vibration to the heads of seated subjects, in order to determine the variations in transmissibility results. Donati et al.…”

Ride comfort uncertainty analysis and reliability design of a passenger vehicle undergoing random road excitation

“…Shoenberger 8 considered the subjective effects of combined-axis vibration on ride comfort through experimentation. Demic 9 investigated the physiological effect of whole body vibration on human body fatigue. Incorporating all of the efforts made through the 1980s, several quantitative measuring indices for the ride comfort of a vehicle were introduced by several institutions, such as the International Standardization Organization (ISO) 10 and the British Standard Institution (BSI).…”