Graduation Design of Wuhan University of Technology

(Application for Bachelor of Engineering dissertation)

Design and simulation of cab mount system for commercial vehicles

Facult: International Institute of Education

Professional classes: gj1601 of vehicle engineering

Name of student: Xiao Yi Ge

Mentors: Zhong Shaohua

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Abstract

Summary With the continuous improvement of China's highway traffic network,the road traffic logistics industry is developing rapidly,commercial vehicles are an important carrier in modern road transportation.Modern logistics generally has the characteristics of long transportation time and changeable driving conditions.In this kind of working condition long-term driving,drivers are easy to appear driving fatigue,thus causing traffic accidents.In addition,the driver's body will suffer a lot of irreversible damage in the low comfort commercial vehicle cab for a long time.At present,the suspension of commercial vehicles generally adopts leaf spring,the structure is simple,and the damping effect is difficult to guarantee.Therefore,the excellent commercial vehicle cab mount system is particularly important to improve the comfort of commercial vehicle cab.This paper mainly carries on the parameterized modeling to the commercial vehicle cab,analyzes and the influence of the different damping coefficient on the ride comfort of the commercial vehicle cab,provides the reference for the realization of the commercial vehicle semi-active mount system.

Firstly,in the early stage of reading a lot of literature,the structure and control strategy of cab mount system for domestic and foreign vehicles are summarized and summarized,which provides ideas and research methods for this paper,introduces the principle and research methods of multi -body dynamics,and also explains the interface ADAMS multi -body dynamics software and the modules needed in this paper.

Secondly,considering the complexity of building vehicle model and the lack of data in hand.Using the model of mount system which has been established in CATIA 3D modeling software and reading the mass and moment of inertia of each component in the CATIA model,a simplified model of cab and mount system is established by parameterization in the ADAMS/VIEW.

Lastly,the MATLAB software is used to generate random input of different strength,then the vertical drive acting on the front and rear mount is established in the

ADAMS/VIEW.The damping of each part of the suspension system is set as a variable to analyze the influence of the change of damping coefficient on the ride comfort of commercial vehicle cab,including the vertical displacement and acceleration of the cab,and finally the control strategy of semi-active suspension system is summarized.

Key Words ：Commercial vehicle ADAMS ride comfort semi-active control

Directory

abstract I

Chapter 1 Introduction 1

1.1Background and Significance of Research 1

1.1.1 background 1

1.1.2 research significance 3

1.2 Current situation of cab mount system of commercial vehicle 4

1.2.1overview of cab mount system for commercial vehicles 4

1.2.2 domestic and foreign research status 9

1.3 Main elements of the study 11

Chapter 2 Theory of Dynamics and Smoothness Analysis of Multibody Systems 12

2.1 Multi-body dynamics theory 12

2.1.1 the dynamics of a multi-rigid system 13

Dynamics of a 2.1.2 flexible system 14

2.2 Multi-body System Dynamics Software 15

2.2.1 ADAMS Software Overview 15

2.2.2ADAMS Software Module Classification 16

2.2.3ADAMS post-processing module 16

2.3 Related theory of cab vibration isolation 18

2.4 Evaluation criteria for vehicle ride comfort 20

2.5 Summary of the chapter 21

Chapter 3 ADAMS Modeling of Suspension Systems 23

3.1 Infrastructure for commercial vehicle mount systems 23

3.2 Modelling Implementation Method in ADAMS 25

3.3 Establishment of cab mount model 26

3.3.1 Acquisition of parameters required for model building 26

3.3.2Establishment of Front Suspension Model 30

3.3.3 Establishment of Post-Suspension Model 30