Empirical analysis on the effect of design variables of automotive seat lumbar support on the initial sitting discomfort

Yang, Jungtae; Choi, Hyung Yun; Lee, J. H.; Lee, Shi-Uk

doi:10.1007/s12239-014-0069-8

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…To reduce drivers' tiredness, a lot of studies are being done about lumbar support for supporting the lumbar of drivers, side bolsters to hold the driver's body at sharp corners, and warm or cool seats to adjust the driver's condition in hot or cold weather. In this study, we worked on research on extension framed of cushions that are able to adjust the length of the seat cushion to the driver's legs, and analyzed the results about damage from weight and impact depending on the material [1][2][3][4][5][6][7][8]. Figure 1 were used for this study of damage depending on materials of mechanical extension frames of seats.…”

Section: Introductionmentioning

confidence: 99%

A study on damage to mechanical seat cushion made from different materials of extension frame

Kim¹,

Cho²,

Cho³

et al. 2018

IJET

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Background/Objectives: : Automotive seat is a very important component to prevent accidents by reducing passenger’s tiredness, thus, this study worked on analyzing damage with different materials of extension frames of mechanical seat cushions.Methods/Statistical analysis: In this study, we performed an experiment on cushion extension frames by splitting it into two parts. We studied about the damage prediction of slave body for each material property of ABS, PP, PLA, and PA6.6. For analyzing the condition, we assigned the side part of the master body for fixed support, and we progressed on analysis by applying with 690N on the entire part of the slave body.Findings: This research worked on the study of damage to different materials of extension frames of seat cushions. After confirming the stress equivalence of the entire model for each material, PP showed the highest equivalent stress of 180.88MPa, and ABS showed the lowest equivalent stress of 151.73MPa. Overall, we could see that in the order of ABS, PA6.6, PLA, PP have a higher tendency to be broken. In addition, when confirming equivalent stress of master body depending on materials of slave body, PA6.6 showed the highest equivalent stress of 166.3MPa, and ABS showed the lowest equivalent stress of 124.06MPa. Overall, we could see that in the order of ABS, PP, PLA and PP6.6 have a higher tendency to be broken. In comparing shear stress on the gear part, which has the highest tendency to be broken in among the entire model, depending on the material of the slave body, PLA showed the greatest shear stress of 88.945MPa, and ABS showed the lowest shear stress of 69.766MPa.Improvements/Applications: This study worked for the improvements and applications of cushion extension frames as the securement of material by investigating these factors.

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Section: Introductionmentioning

confidence: 99%

A study on damage to mechanical seat cushion made from different materials of extension frame

Kim¹,

Cho²,

Cho³

et al. 2018

IJET

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“…An automobile seat must ensure the safety and comfort of both drivers and passengers. [1][2][3] Established systematic design methods exist to ensure that safety criteria are met; however, comfort is more difficult to evaluate because it is fundamentally subjective. 4,5 Some studies have reported evaluation criteria for comfort based on the mechanical behaviour, such as the body pressure distribution, the reaction force when seated and the dynamic characteristics of the seat.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of the viscoelastic deformation of seat foam in response to long-term driving

Kim

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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The aim of this paper is to carry out a quantitative evaluation of the time-dependent mechanical characteristics of seat foam and to suggest a process for predicting the viscoelastic deformation of the seat assembly in response to long-term driving. Several tests were conducted to obtain the mechanical properties of the seat components, and the test data were applied in the construction of the material models of the foam pad, the slab foam and the seat cover. An explicit solver (PAM-COMFORT® from ESI) was used to analyse and construct the seat assembly model, and we assumed that the time-dependent behaviour of the seat foam is based on degradation of the material. To describe the behaviour, we used time-dependent stress–strain relationships to account for the viscoelastic characteristics of the seat foam to enable the PAM-COMFORT solver to be used. On multiplying the normalized relaxation modulus by the stress–strain relation, the time-dependent stress–strain relationships can be obtained. In this approach, the material modelling is not a direct method to describe the viscoelasticity using a built-in material model in the commercial program. In order to verify the process, an indenter was used to apply a compressive load to the seat, and the time dependences of the applied load and the deformation were measured experimentally and compared with the results of the numerical analysis. There was good agreement between the experimental results and the numerical analysis results.

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“…Assim, o dispositivo (especialmente pensado para o lugar do condutor) deverá parar o movimento da cabeça, em caso de impacto ou colisão, sem causar lesões ao condutor do veículo(FERREIRA, 2013, outubro 14). Diversos autores (por exemplo:MATSUI et al, 2018; YANG, Y. et al, n.d.;YANG, J., 2014;YANG, Z., 2018; ZHANG et al, n.d.; FERREIRA, 2013, outubro 14) e as recomendações de vários fabricantes de automóveis, apontam que a altura correta do encosto de cabeça é atingida quando a parte superior da cabeça fica ao mesmo nível do encosto de cabeça. No que concerne à utilização/ajuste, recomenda-se que a separação ou a distância entre o encosto e a cabeça, tanto do condutor como dos ocupantes, não seja inferior a quatro centímetros, nem superior a sete centímetros; Figura 6.…”

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Tópicos Para Design E Ergonomia: O Apoio De Cabeça Do Banco Dianteiro Automóvel

Fernandes

2023

Ergonomia: Tópicos Atuais Em Pesquisa

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Os apoios de cabeça dos bancos do automóvel, em particular os dianteiros (lugares da frente: condutor e passageiro) apresentam um conjunto de funções técnicas e aspetos ergonómicos fundamentais à segurança e ao conforto do usuário. Este capítulo tem por objetivo apresentar as principais diretrizes a considerar na concepção e projeto de design dos apoios de cabeça dos bancos dianteiros dos automóveis, de modo a cumprir requesitos funcionais, ergonómicos e de conforto. Para o efeito, identificam-se Normas de projeto aplicáveis ao sector automotivo, Legislação entre outras recomendações/observações identificadas pela autora. Os resultados apontam essas Normas e Legislação aplicável ao projeto dos bancos dianteiros dos automóveis e outras observações tidas por pertinentes, em particular quando considerados usuários seniores cuja condição física é de maior fragilidade e fraqueza, comparativamente com usuários mais jovens e robustos. Concluimos que existe falta de dados antropométricos atualizados das populações, bem como de modelos de teste antropométrico (ATDs) representativos de utilizadores seniores, para análise dimensional e teste (sem os quais se torna difícil avaliar métricas dimensionais e de segurança mais adequadas). Por conseguinte, importa pensar o projeto para o público-alvo, pelo que é necessário selecionar grupos de pessoas (homens e mulheres, jovens e seniores), ou seja, para os perfis antropométricos dos usuários (com as métricas padrão dos indivíduos dos países a que se destinam). Assim, é fundamental uma validação experimental dos protótipos dos apoios de cabeça dos bancos dianteiros do automóvel, em projeto de design ou desenvolvimento de produto, para garantia do sucesso, ao nível da segurança, conforto e qualidade.

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Empirical analysis on the effect of design variables of automotive seat lumbar support on the initial sitting discomfort

Cited by 7 publications

References 7 publications

A study on damage to mechanical seat cushion made from different materials of extension frame

A study on damage to mechanical seat cushion made from different materials of extension frame

Numerical prediction of the viscoelastic deformation of seat foam in response to long-term driving

Tópicos Para Design E Ergonomia: O Apoio De Cabeça Do Banco Dianteiro Automóvel

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