1. 研究目的与意义（文献综述）

1. Purpose and significance (including analysis of theresearch status at home and abroad)

With thevigorous development of the automobile industry, people gradually have higherrequirements on the handling stability and smoothness of automobiles. But inthis domain scope, the automobile suspension has the pivotal role. Automobilesuspension from the most simple leaf spring to the spiral spring, and then tothe passive suspension, semi-active suspension, active suspension. Through manyreforms. But the domestic start is late, therefore the active suspensionapplication scope is not very broad, overseas already relatively mature. Safe,intelligent and clean intelligent suspension will be the development trend ofautomobile suspension in the future. The research on semi-active and activesuspension started late in China and there is a big gap between China andforeign countries. In western developed countries, semi-active suspension hasbeen mature since 1980s. However, due to the limitations of other aspects,active suspension was proposed early, but it is difficult to make abreakthrough.

2. 研究的基本内容与方案

2. Research (design) of thebasic content. Objectives. Proposed technical solutions and measures

2.1 design parameter

In this design,among the intermediate cars, the 2018 version of the manual comfort 1.4l isselected as the reference. The specific parameters are as follows:

length（mm）	3730
width（mm）	1650
height（mm）	1530
Wheel base（mm）	2410
Front gauge（mm）	1420
Track rear（mm）	1430
Curb weight（kg）	1020
Maximum power（KW）	74
Maximum torque（N·m）	135
Front tire specification	165/60 R14
Rear tire specification	165/60 R14
drive mode	FF
The type of front suspension	McPherson independent suspension
The type of rear suspension	Torsion beam type non-independent suspension
Maximum torque speed	4000

2.2 basic content

(1) tounderstand the development status of automobile suspension technology at homeand abroad.

(2) refer torelevant standards and regulations of suspension.

(3) determineand analyze the suspension design scheme of premium cars.

(4) complete thedesign and calculation of the suspension and components.

(5) complete thestructural design of components.

(6) draw 3dassembly drawings and main part drawings.

2.3 technical route

(1) selection offront and rear suspension structures;

(2)determination and calculation of technical parameters (main technicalparameters, suspension performance parameters, suspension static deflection,suspension dynamic deflection, suspension elastic characteristic curve);

(3) design ofelastic elements;

(4) shockabsorber design;

(5) design ofhorizontal stabilizer bar;

(6) suspensionguide mechanism design;

(7) smoothness analysis

2.4 Measures adopted

In order to meet the requirements of good ridecomfort, the natural frequency of the vibration system composed of spring massand elastic components should be in the appropriate frequency band and as lowas possible. Therefore, catia is used to model and complete the assembly of theautomobile suspension after the calculation of each software.

3. 研究计划与安排

3. scheduling

1-2 (week 19-20of the 7th semester) determine the graduation project topic selection, improvethe graduation project assignment (relevant parameters), and collectinformation on campus

3 (week 1,semester 8) project conception, literature retrieval, and completion of theproposal report

4. 参考文献（12篇以上）

4. there are no less than 15 papers on graduationproject, including 5 foreign papers

[1] 王望予.汽车设计（第3版）[m].北京：机械工业出版社，2000.

[2] 陈佳瑞.汽车构造（上）（第3版） [m].北京：机械工业出版社，2005