Effects of seat structural dynamics on current ride comfort criteria

Fard, Mohammad; Lo, Leon; Subic, Aleksandar; Jazar, Reza N.

doi:10.1080/00140139.2014.934300

Cited by 22 publications

(12 citation statements)

References 19 publications

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“…In order to minimize any possible effects of noise on the results of this study, care was taken to run all experiment in similar noise conditions. Prior to drowsiness measurement, measurement of total transmitted vibration (seat pan and backrest) to each volunteer have been done in accordance with ISO 2631-1 (1997) and used the method reported by Fard et al 11 , 29 ) . The measurement was carried out to adjust the required hydraulic input force for every volunteer to become 0.2 ms −2 r.m.s.…”

Section: Methodsmentioning

confidence: 99%

“…Two tri-axial accelerometer pads (SVANTEK SV-38V model) were used to measure the transmitted vibration to the human volunteer body at both seat cushion and the seatback 29 ) . This magnitude was calculated according to ISO2631-1 (1997) International Standard, which represents a total transmitted vibration value measured from the transducer or accelerometer pad that was placed at the interface between seat supporting surface (seat cushion and seatback) and human interface.…”

Section: Methodsmentioning

confidence: 99%

“…The frequency weighting curves define the values by which the vibration magnitude at each specific frequency is to be multiplied in order to weight the measured vibration in accordance with the human body 8 ) . The multiplication factors ( Table 1 ) were used to weight the effects of seatback and seat pan vibrations on the ride comfort assessment 11 , 29 ) .…”

Section: Methodsmentioning

confidence: 99%

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The influence of vibration on seated human drowsiness

et al. 2016

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Although much is known about human body vibration discomfort, there is little research data on the effects of vibration on vehicle occupant drowsiness. A laboratory experimental setup has been developed. Vibration was applied to the volunteers sitting on the vehicle seat mounted on the vibration platform. Seated volunteers were exposed to a Gaussian random vibration, with 1–15 Hz frequency bandwidth at 0.2 ms−2 r.m.s., for 20-minutes. Two drowsiness measurement methods were used, Psychomotor Vigilance Test (PVT) and Karolinska Sleepiness Scale (KSS). Significant changes in PVT (p<0.05) and KSS (p<0.05) were detected in all eighteen volunteers. Furthermore, a moderate correlation (r>0.4) was observed between objective measurement (PVT) and subjective measurement (KSS). The results suggest that exposure to vibration even for 20-minutes can cause significant drowsiness impairing psychomotor performance. This finding has important implications for road safety.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The influence of vibration on seated human drowsiness

et al. 2016

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“…For security and efficiency reasons, researchers usually prefer using laboratory devices to using real vehicles, for example, Fard discussed the effects of seated structural dynamics on ride comfort criteria using a vibration simulation system [ 15 ]. With the development of simulation technology, a motion simulation system now can convey the effect of gravitational forces and cues participants experience during kinematic changes in acceleration.…”

Section: Introductionmentioning

confidence: 99%

Using Hand Grip Force as a Correlate of Longitudinal Acceleration Comfort for Rapid Transit Trains

Guo

Gan

Fang

2015

Sensors

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Longitudinal acceleration comfort is one of the essential metrics used to evaluate the ride comfort of train. The aim of this study was to investigate the effectiveness of using hand grip force as a correlate of longitudinal acceleration comfort of rapid transit trains. In the paper, a motion simulation system was set up and a two-stage experiment was designed to investigate the role of the grip force on the longitudinal comfort of rapid transit trains. The results of the experiment show that the incremental grip force was linearly correlated with the longitudinal acceleration value, while the incremental grip force had no correlation with the direction of the longitudinal acceleration vector. The results also show that the effects of incremental grip force and acceleration duration on the longitudinal comfort of rapid transit trains were significant. Based on multiple regression analysis, a step function model was established to predict the longitudinal comfort of rapid transit trains using the incremental grip force and the acceleration duration. The feasibility and practicably of the model was verified by a field test. Furthermore, a comparative analysis shows that the motion simulation system and the grip force based model were valid to support the laboratory studies on the longitudinal comfort of rapid transit trains.

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“…Piecewise linear is a vibration isolator whose system has nonlinear geometric characteristics of sti ness and damping, where nonlinearity is a result of moving among nite number of liner segments, [15]. These systems potentially can model and a variety of practical applications [17][18][19]. The piecewise linear systems are di cult to analyze as sudden changes in system parameters display unprecedented complex behavior.…”

Section: Introductionmentioning

confidence: 99%