Numerical evaluation of time-dependent sagging for low density polyurethane foams to apply the long-term driving comfort on the seat cushion design

Kim, Dae Young; Bang, Jun Ho; Lee, Chung An; Kim, Heon Young; Choi, Kwon Yong; Lim, Byung Guk

doi:10.1016/j.ergon.2016.08.010

Cited by 17 publications

(5 citation statements)

References 19 publications

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“…In short, for the ejection seat cushion, too soft and hard slow-recovery cushions will cause a decline in comfort; the overall performance in comfort of the N3 seat cushion is the best. For pilots on extended missions, lack of support can affect sitting comfort (Cascioli et al, 2011;Kim et al, 2018). Further analysis of the evaluation of support showed that the support rating was significantly positively correlated with 65% IFD.…”

Section: Discussionmentioning

confidence: 99%

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Comfort Evaluation of Slow-Recovery Ejection Seat Cushions Based on Sitting Pressure Distribution

Jiayi

Zhou

Wang

et al. 2021

Front. Bioeng. Biotechnol.

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Sitting discomfort not only affects the health of pilots carrying out long-endurance missions but also affects operational performance. The experimental objects included four ejection seat cushions: N1 was a fast-recovery foam as the comparison group, and the experimental groups were slow-recovery foams with different indentation force deflection (IFD), named N2 (hard), N3 (mid), and N4 (soft). The sitting comfort of 20 participants was tested on the four cushions by using subjective rating and sitting pressure distribution analysis. The results showed that compared with fast-recovery cushion N3 and N4 slow-recovery cushions have lower contact pressure and more uniform pressure distribution. Slow-recovery cushions that were too soft or too hard would reduce the comfort. No matter from the subjective rating or the analysis of the contact pressure data, the N3 cushion with a thickness of 3 cm and 65% IFD of 280 N had the highest comfort. In addition, the seat pressure distribution (SPD%) has a significant correlation with the subjective rating (p = 0.019, R = −0.98), which is more suitable for evaluating the comfort of the cushions. However, the slow-recovery cushions would show a decrease in support after a period of sitting, while the fast-recovery cushion could always maintain constant support.

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Section: Discussionmentioning

confidence: 99%

“…For pilots on extended missions, lack of support can affect sitting comfort ( Cascioli et al, 2011 ; Kim et al, 2018 ). Further analysis of the evaluation of support showed that the support rating was significantly positively correlated with 65% IFD.…”

Section: Discussionmentioning

confidence: 99%

Comfort Evaluation of Slow-Recovery Ejection Seat Cushions Based on Sitting Pressure Distribution

Jiayi

Zhou

Wang

et al. 2021

Front. Bioeng. Biotechnol.

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“…In recent studies, polyurethane (PU) performs excellent energy absorption and resilience for the functional protective materials [246][247][248]. Wu et al [249], experimented STF with 30%, 50%, and 70% for flexible woven composite with polyurethane glycol (PEG).…”

Section: Background Of Stfmentioning

confidence: 99%

Enhancement of impact toughness and damage behaviour of natural fibre reinforced composites and their hybrids through novel improvement techniques: A critical review

Ahmed

Dhakal

Zhang

et al. 2021

Composite Structures

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“…The cushion contour had a greater effect on seat pan interface pressure [ 21 ]. There is also literature that analyzes the bearing capacity and pressure distribution characteristics of seat cushions through numerical simulation methods [ 22 , 23 ]. Most of the current studies on the comfort of seating surfaces are based on existing product surfaces or comparative studies of a single contour.…”

Section: Introductionmentioning

confidence: 99%

Influences of cushion contour on passenger comfort and interface pressure in high-speed train

Lian²,

Wu³

2023

PLoS ONE

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In this paper, eight different contoured cushions (S1-S8) in two categories (flat and wrapped) were designed to study the influence of different contoured cushions on passenger comfort in high-speed trains. Meanwhile, subjective data investigation by the comfort Likert Scale questionnaire and objective physical variables collection by the body-cushion contact pressure test was carried out. In addition, one-way ANOVA and Pearson correlation analysis were performed on the subjective survey and objective test data. The results show that the cushion contours had a significant effect on the subjective evaluation of the overall comfort of the participants, in which the overall comfort below the waist of the separated wrapped cushion S8 has the highest subjective comfort score. The overall comfort of the flat-front bulge type cushion S4 and the local comfort of the thighs and the root of the thighs were rated higher than other flat types. Under the flat cushion, the effect of stature characteristics (mainly weight and hip-width) on the overall comfort subjective ratings was insignificant, and the effect on the contact pressure distribution variables was significant, but the contact pressure distribution variables were not correlated with the comfort ratings. Under the wrapped cushion, the effect of stature characteristics on the overall comfort subjective ratings and contact pressure distribution variables was significant. There were positive and negative correlations between the average peak contact pressure and average contact pressure and comfort ratings, respectively.

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Numerical evaluation of time-dependent sagging for low density polyurethane foams to apply the long-term driving comfort on the seat cushion design

Cited by 17 publications

References 19 publications

Comfort Evaluation of Slow-Recovery Ejection Seat Cushions Based on Sitting Pressure Distribution

Comfort Evaluation of Slow-Recovery Ejection Seat Cushions Based on Sitting Pressure Distribution

Enhancement of impact toughness and damage behaviour of natural fibre reinforced composites and their hybrids through novel improvement techniques: A critical review

Influences of cushion contour on passenger comfort and interface pressure in high-speed train

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