A Study on the Characteristics of Vibration in Seat System

Baik, Sungshik; Lee, Jong-Bum; Suh, Jin-Kwan

doi:10.4271/2003-01-1603

Cited by 16 publications

(15 citation statements)

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“…It is, however, shown in the literature that the occupied vehicle seat has three main lateral, fore-aft and twisting structural vibration modes in frequencies below 80 Hz (Doolan and Mannino 1995;Baik, Lee, and Suh 2003;Ramkumar et al 2011;Lo et al 2013). Nevertheless, the possible effects of the structural vibration modes of the occupied seat have not been considered in the current (ISO 2631(ISO -1 1997 for the assessment of the seated human body comfort.…”

Section: Discussionmentioning

confidence: 86%

“…Nevertheless, according to the literature (Doolan and Mannino 1995;Baik, Lee, and Suh 2003;Ramkumar et al 2011;Lo et al 2013), the occupied seat structure has lateral, fore-aft and twisting, structural vibration modes at frequencies below 80 Hz. The effects of seat structural dynamics on comfort assessment are important as the occupied seat modes occur at frequencies below 80 Hz at which the human body has considerable sensitivity to vibration (Griffin 1990;ISO 2631ISO -1 1997Toward and Griffin 2011).…”

Section: Introductionmentioning

confidence: 98%

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Effects of seat structural dynamics on current ride comfort criteria

Fard

Subic

et al. 2014

Ergonomics

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 98%

Effects of seat structural dynamics on current ride comfort criteria

Fard

Subic

et al. 2014

Ergonomics

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“…Vibration transmitted to the human body contributes signi cantly towards human perception and ride comfort quality [1,8,9]. Fundamental mode of automotive body which can transmit vibration to the seat structure occur at a frequency below 60 Hz [19].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the effects of vibration on seated driver alertness

Azizan

Fard

Azari

2014

Nonlinear Engineering

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Although performance of vehicle drivers under fatigue conditions has been investigated in many types of environments, there is insu cient research data about the e ects of vibration speci cally on levels of mental alertness in seated drivers. In addition to the paucity of research in this area, the study of drowsiness caused by whole body vibration is complex due to several confounding factors (such as lack of sleep, air temperature, health). Hence, we investigated the relationship between whole body vibration and driver drowsiness. A human vibration test setup was designed for this study. Ten subjects were exposed to low frequency sinusoidal and random whole body vibration in multi-axial vibration at 0.3 m/s² (rms) for 20 minutes. Changes in drowsiness during vibration exposure were measured by recording electroencephalographic signals. Two brainwave spectrums (theta and beta waves) were used for analysis. Exposure to whole body vibration was found to be correlated with a reduction in alertness. Reduction in beta wave and increase in theta wave activity, caused by vibration, were found to be statistically signi cant. The data presented here quantify for the rst time the drowsiness caused by whole body vibration and will help de ne the threshold limit for safe driving.

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“…It is widely known that the transmitted vibration affects the human perception and ride comfort [14][15][16]. ISO 2631-1 (1997) international standard has been used efficaciously to assess human exposure to whole-body vibration.…”

Section: Introductionmentioning

confidence: 99%

Lane keeping performances subjected to whole-body vibrations

Azizan¹,

Padil²

2018

IJET

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Despite the fact that many research have been carried out on the characterization of the effects of whole-body vibration on seated occupants’ comfort, there is still very little scientific knowledge regarding drowsiness caused by the vibrations. Furthermore, there are less verified measurement methods available to quantify the whole body vibration-induced drowsiness of the vehicle occupants. This study is therefore set out to evaluate the effect of vibrations on drowsiness. 20 male volunteers have been recruited for this experiment. The data for this study is gathered from 10-minute simulated driving sessions under both no-vibration conditions and with a vibration that is randomly organized. Gaussian random vibration, with 1-15 Hz frequency bandwidth at 0.2 ms-2 r.m.s. for 30 minutes, is applied. During the driving session, the volunteers are required to obey the speed limit of a 100 kph and keep a consistent position in the left-hand lane. The deviation in the lateral position are recorded and analyzed. Additionally, the volunteers are also asked to rate their subjective drowsiness level by means of Karolinska Sleepiness Scale (KSS) scores for every five minutes. Based on the results, the role of vibration in promoting drowsiness can be observed from the driving impairment following 30-mins exposure to vibration.

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A Study on the Characteristics of Vibration in Seat System

Cited by 16 publications

References 1 publication

Effects of seat structural dynamics on current ride comfort criteria

Effects of seat structural dynamics on current ride comfort criteria

Characterization of the effects of vibration on seated driver alertness

Lane keeping performances subjected to whole-body vibrations

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