• 한국자동차공학회논문집
• /
• 제12권3호
• /
• pp.91-100
• /
• 2004

This study presents the development of a new aluminum seat frame for the commercial bus. Back moment and seat belt anchorage analysis of the conventional steel seat frame was conducted as a base model. Effective aluminum section dimensions for aluminum pipe were calculated from equivalent stiffness and equivalent weight study. Back moment and seat belt anchorage strength with the developed aluminum seat frame were compared to those of the base model. Additionally, to pass the fatigue test, shape modification of side frame assembly was conducted. From this study we could reduce the weight of seat frame more than 5 kg. And the current analysis model and procedure can provide useful informations in designing a new commercial car seat and can reduce the overall design cost and time.

• 한국자동차공학회논문집
• /
• 제7권6호
• /
• pp.241-247
• /
• 1999

This study presents the structural analysis of car a seat frame by the finite element method. The load-deformation characteristics of seat frame are simulated according to the test requirements by FMVSS. Three dimensional modeling technique is applied to the components of the seat frame. The shell, solid , gap and rigid elements are employed to model the car seat frame assembly. Numerical results show that the recliner and kunckle plate are identified as the possible weak part of frame, and the results are well consistent with the experimental static load test. The current analysis model can provide useful informations to design a new car seat and can reduce the overall design cost and time.

• 한국자동차공학회논문집
• /
• 제14권5호
• /
• pp.155-163
• /
• 2006

Car seat is one the most important element to make comfortable drivability. It can absorb the impact or vibration during driving state. In addition to those factors, it is needed to have enough strength for passenger safety. From energy efficiency and environmental point of view lighter passenger car seat frame becomes hot issue in the auto industry. In this paper, weight optimization methodology is investigated for commercial car seat frame using CAE. Optimized designs for seat frame are developed using commercially available finite element code(ANSYS) and design of experiment method. At first, car seat frame is modelled using 3-D computer aided design tool(CATIA) and simplified for finite element modelling. Finite element analysis is carried out for the case of FMVSS 202 Head Restraint test to check the strength of the original seat frame. Two base brackets are selected as optimized elements that are the heaviest parts in the seat frame. After finite element analysis for the brackets with similar load condition to the previous test optimization technique is applied for 10% to 50% weight reduction. Design of experiment is utilized to obtain optimization design for the bracket based on the modified 50% weight reduction model in which outer shape of the bracket is conserved. Weight optimization models result in the decrease of the strength in spite of weight reduction. The more design points should be considered to get better optimized model. The more advanced optimization technique may be utilized for more parts of the seat frame to increase whole seat frame characteristics in the future.

• 자동차안전학회지
• /
• 제11권4호
• /
• pp.57-62
• /
• 2019

The seat back frame of the vehicle is subjected to load on the passenger behavior. Because of steel material, it is necessary to optimize the frame considering lightweight and safety. In this paper, finite element analysis is used for the optimal design of the seat back frame. First, a lightweight material is applied to reduce the weight of the seat back frame. Secondly, the design position of the pipe part fastened in the seat back frame was selected by considering the strength against the load generated by the occupant. Third, the shape of the side frame was derived by performing the phase optimization analysis for the AFT load condition. And we have compared the initial model with the optimal model to verify the light weighting and safety. As a result, the optimal design model of the seat back frame satisfying the weight reduction and safety has been proposed.

• 한국안전학회지
• /
• 제15권1호
• /
• pp.80-85
• /
• 2000

The hydroforming process is rapidly gaining popularity in the sheet metal forming industry. In this study, hydroforming process is applied to the seat back frame. The load-deformation characteristics of seat frame are simulated according to the test requirements by FMVSS. Structural analyses were performed with an analysis package program named I-DEAS for the conventional and the hydroforming seat back frame. The seat back frame made by hydroforming is not only about 23 percent lightweight, but also about 20 percent high strength compared with conventional that.

• 자동차안전학회지
• /
• 제14권4호
• /
• pp.27-34
• /
• 2022

In the development of automated driving, interest in the interior parts of vehicle is to become more significant in terms of the occupant safety and comfort. This study proposed an optimal design of front seat according to the design requirements for frame stiffness and seat comfort. For the seat comfort, the appropriate foam thickness was obtained using the structural analysis under reclined occupant loadings. While the strength and stiffness analyses were performed to evaluate the seat frame structure. Topology optimization was carried out based on the simulation results and the derived optimal model and baseline seat design was updated. The conceptual seat design for the autonomous vehicle in this study showed that the model development process is appropriate for the design parameters in both frame stiffness and seat comfort.

• 한국자동차공학회논문집
• /
• 제11권6호
• /
• pp.205-212
• /
• 2003

This paper may provide a basic design data for the safer car seat mechanism and the quality of the material used by finding out the passenger's dynamic behavior when protected by seat belt during collision. A computer simulation with finite element method is used to accomplish this objective. At first, a detailed geometric model of the seat is constructed using CAD program. The formation of a finite element from a geometric data of the seat is carried out using Hyper-Mesh that is the commercial software for mesh generation and post processing. In addition to seat modeling, the finite element model of seat belt and dummy is formed using the same software. Rear impact analysis is accomplished using Pam-Crash with crash pulse. The part of the recliner and right frame is under big stress in rear crash analysis because the acceleration force is exerted on the back of the seat by dummy. The stress condition of the part of the bracket is checked as well because it is considered as an important variable on the seat design. Front impact model which including dummy and seal belt is analyzed. A Part of anchor buckle of seat frame has high stress distribution because of retraction force due to forward motion of dummy at the moment of collision. On the basis of the analysis result, remodeling and reanalysis works had been repeatedly done until a satisfactory result is obtained.

• 한국융합학회논문지
• /
• 제9권8호
• /
• pp.155-160
• /
• 2018

자동차 시트는 주행시 운전자의 편의와 안전을 제공하는 하나의 부품이다. 최근 그 시트는 의자와 같은 용도 외에 외부의 충격이나 진동으로부터 운전자를 보호하고 편의를 주는 역할을 하고 있다. 자동차의 충돌 안전성 및 내구성과 같이 시트 프레임의 구조적인 기능에 대한 설계가 중요하다. 본 연구에서는 시트 프레임의 구조적인 안전성과 내구성을 높이기 위하여 시트 백 프레임 부분에 환봉을 1개씩 증가하여 시트를 설계하였다. 설계 및 해석 프로그램으로는 CATIA와 ANSYS를 사용하여 본 연구를 수행하였다. 구조해석과 진동해석을 통한 본 연구 결과로서는 Model 4가 타 모델 대비 더 뛰어난 내구성을 가지는 것을 알 수 있었다. 이 결과를 이용함으로서 구조적인 안전성과 내구성을 가진 자동차 시트 프레임 설계를 할 때에 유용한 자료가 될 것이라고 사료되며, 자동차 시트 프레임의 디자인을 융합기술에 접목하여 미적 감각을 나타낼 수 있다.

• 한국기계가공학회지
• /
• 제19권10호
• /
• pp.16-23
• /
• 2020

Vehicle seats provide a comfortable ride for passengers by properly absorbing vibrations and shocks transmitted during driving. Vibration analyses on three models with different shapes were carried with the same material properties and constraint conditions. By varying the height of the seat-back, models 1, 2, and 3 were designed according to the inclined angle of the seat-back frame. Models 1, 2, and 3 were modeled with relatively simple designs using CATIA. The areas touching the buttocks of passengers show the most deformation. This work shows that seat durability and stability can vary depending on the shape of the seat design.

• 한국생산제조학회지
• /
• 제8권5호
• /
• pp.83-89
• /
• 1999

A seat frame structure in automotive vehicles made of polymer matrix composite to achieve weight reduction at low cost was developed. In order to design and manufacture the actual product studies on material selection and structural analysis were performed. Structural analysis was performed with a finite element method. The analysis was done for several cases suggested in various safety regulations. Each results was utilized to modify the actual shape to obtain a lighter, safer and more stable design. The final design was used to produce a sample bottom plate of the seat structure with reinforced by X-shape frame. Substitution of the material resulted in a weight reduction effect with equivalent strength fatigue and impact characteristics.