Graduation Design (Dissertation) of Wuhan University of Technology

Compact Car General Layout and Design

College (Department): International Institute of Education

Specialty amp; Class: Vehicle engineering gj1302

Student name: He Zhicheng

Tutor: Guo Huiru

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Abstract

The auto-body has become one of the largest system that influence of various properties such as power, fuel economy, ride comfort and so on while vehicle has developed nowadays. It will have a great impact on consumers’ buying desire especially for the body appearance. People have higher demand of safety, comfort, reliability and the society has incresing requirements for energy saving, low carbon style, environmental protection at the same time. Therefore, research on the compact car body layout has realistic meaning.

The content of this design is the auto-body layout and design of the compact car, according to the parameters of existing Sagitar models, internal layout of the body, to meet the basic principle of ergonomics, and in strictly accordance with the positioning method given in SAE. In the layout process, we try to select the larger size cab.

This paper introduces the ergonomics and automobile layout tools: human template, eyellipse, head envelop surface. Theselection of hard point size is the difficulty of this design, because many parameters cannot be obtained, so we choose some parameters through the real vehicle measurement, finally completed the CATIA seat, Eyellipse, head profile enveloping surface modeling and rendering Auto-CAD simplified version of body layout.

Keywords: Auto-body general layout; Ergonomics; Vehicle layout tools

Contents

Abstract 4

Contents 1

1. Intorduction 3

1.1 Research purpose and meaning 3

1.2 Research status at domestic and overseas 4

1.2.1 The domestic research status 4

1.2.2 Research status abroad 5

1.3Basic content, technical scheme, measures 6

1.3.1 The basic content 6

1.3.2 Technical scheme 6

1.3.3 Design flow chart 7

2. Automobile body design methodology 8

2.1 Traditional automobile body design methodology 8

2.2 Modern body design method 9

2.3Ergonomics software 10

3. Consideration of the body layout 12

3.1 Body load type 12

3.2 Standard line for vehicle layout - Determination of zero line 12

3.3 Body arrangement and layout 13

3.4 The content of body layout 14

3.4.1 Overview of the body layout work 14

3.4.2 The body layout of the design 14

3.4.3 The principle of the body layout 14

3.5 The object car in this design 16

4 The application of ergonomics 17

4.1 The overview of ergonomics 17

4.2 The Man-machine relationship 17

4.3 The influence of ergonomics on the general layout of auto-body 18

4.4 Human model 18

4.4.1 Body size 18

4.4.2 Body size choice 19

4.4.3 Sitting posture template 20

4.5 Seat position determination 23

4.5.1 H point machine 23

4.5.2 The benchmark on shoes and pedals 23

4.5.3 The determination of the H-point’s location 24

4.5.4 The geometric parameters of the seat 25

4.6 The eyellipse 26

4.6.1 The defination of the eyellipse 26

4.6.2 The intorduction of eye ellipse theory 26

4.6.3 The calculation of eyellipse’s location 27

4.6.4 The significance of eyellipse 30

4.7 Head profile envelope 30

4.7.1 The definition of head profile envelope 30

4.7.2 The head envelope surface 31

4.7.3 The location of head envelope surface 31

5 The overview of the vehicle interior layout 33

5.1 The pedal layout 33

5.2 The steering wheel arrangement 34

5.3 Eye point and front window sight check 34

5.4 Hard point size calculation 35

Conclusion 36

Reference paper 37

Ackonwledgement 38

1. Intorduction

1.1 Research purpose and meaning

China’s automobile industry started from the scratch. At the beginning, we were dependent on pre-designed drawings, technical documents and manufacturing processes, then we turned to reverse engineering and added some creative ideas, finally we can embrace the golden age of indigenous research and development. Nevertheless automobile body technology is still a young discipline. Traditional body design depends much on the designer’s experience, and they have to change the parameter date over and over again ever since they found something wrong. That is the reason why it is laborious and inefficient. It takes two or three years normally. Development and product preparation cycle is long too. On the other hand, modern body design technology overcomes these difficulties by relying on computer technology which can greatly shorten the development cycle. These auxiliary tools conclude CAD\CAE\CAM technology, digital body design and VR technology (under research). These technologies provide us conditions to develop multiple products at the same time and sharing information together. They improve the flexibility and convenience of body design.

Consumer’s choice and attractions make the larger proportion in the design of a vehicle body. Because of it, automobile companies around the world increase the tech investment on body development and each brand has its own special features and blends enterprise culture in it. In USA and Europe people-oriented” design concept has been deeply remembered by their minds therefore, we should ensure the ride comfort, body sealing, heat insulation, sound insulation, safety, control convenience, vision, easiness on up and down and so on. For these reasons, ergonomics becomes the core of the auto-body layout. Ergonomics is a science about the interaction between human, machine and environment. Its purpose is to make car’s all kinds of performance suit people’s requirement physiology and mentally better in both subjective and objective.