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1 OVERVIEW---an example of mechanical engineers design
FIGURE 1.1 Mechanical engineers design and test complex high speed machinery such as this diesel power plant （柴油机动力装置 ）for highway construction equipment． Source：Reprinted courtesy of Caterpillar Inc.
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3 WHO ARE MECHANICAL ENGINEERS?-------working fields of mechanical engineers
replacement heart valves Acceleration sensors
equipment for detecting explosives
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1 OVERVIEW----discipline of mechanical engineering machine components
What "elements” is concerned in the discipline of mechanical engineering ?
forces materials energy motion design
FIGURE 1.3 Close-up view of a Space Shuttle main engine during attest in which it is swiveled to evaluate steering performance during simulated flight conditions. Source：Reprinted with permission of NASA．
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2 WHAT IS ENGINEERING?----engineers’ skill combination
Mathematics Engineering
Hardware
Science
Computer simulation
FIGURE1.5 Engineers combine their skills in mathematics, science, computers, and hardware.
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1 OVERVIEW--- The ability to be available in this chapter
Describe the differences between engineers and scientists and mathematicians. Describe the type of work that mechanical engineers do, and list some of the technical issues that they address.
LOGO
An
introduction
to
mechanical engineering
Lecturer: Liu Ju-rong
1
CHAPTER1 The Mechanical Engineering Profession
1 2
OVERVIEW WHAT IS ENGINEERING? WHO ARE MECHANICAL ENGINEERS?
3
Vocabulary
turbopump 涡轮泵 turbines 汽轮机 condenser 压缩机 Space Shuttle 航天飞机 robot 机器人 machine tool 机床 materials handling system 物料搬运系统 industrial production equipment 工业生产装备 acceleration sensor 加速度传感器
FIGURE 1.6 Percentages of engineers working in various engineering fields.
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3 WHO ARE MECHANICAL ENGINEERS?---definition
Mechanical engineers research, develop, design, manufacture and test tools, engines, machines, and other mechanical devices.
automobiles
robotic manufacturing systems jet engines
aircraft
implants
The field of Mechanical Engineers
computer hard drives
microelectromechanical
3 4
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CAREER PATHS TYPYCAL PROGRAM OF STUDY
2
Vocabulary
internal combustion engine 内燃机 robotic welding equipment 机械手焊接装置 prosthetic limb 弥补性的，置换的，假肢 jet engine 喷气式发动机 physical quantity 物理量 trillionfold 百万兆 （1012） autofocus lens 自聚焦透镜 rowing machine 划船机 stair climber 爬楼梯机 drill press 台钻
Materials Petroleum 1% 1% Nuclear 1%
Chemical 3% Aerospace 4%
Mining 1%
Industrial 9%
All other engineers 28%
Civil 13% Mechanical 15%
Electrical and electronics 24%
They work on power-producing machines such as electricity-producing generators, internal combustion engines, steam and gas turbines, and jet and rocket engines.
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2 WHAT IS ENGINEERING?--- Basic concepts
What is engineering?
The word engineering derives from the Latin root ingeniere, meaning to design or to devise, which also forms the basis of the word ingenious.
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2 WHAT IS ENGINEERING?---an example
FIGURE 1.4 A remarkable engineering achievement, the Space Shuttle Atlantis thunders into orbit as its twin solid rocket boosters and three main engines produce 7 million pounds of thrust. Source：Reprinted with permission of NASA．
After study, what should you be able to have?
Discuss the types of industries and governmental agencies that employ mechanical engineers.
List some of the products, processes, and hardware with which mechanical engineers work. Describe notable achievements of the mechanical engineering profession. Understand the structure and objectives of a typical curriculum for mechanical engineering students.
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2 WHAT IS ENGINEERING?---traditional disciplines
mechanical
electrical
the traditional disciplines of engineering
civil
materials
chemical
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2 WHAT IS ENGINEERING?----working fields of engineers
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1 OVERVIEW----mechanical power range
Ultrasonic motor Machine tools Shuttle fuel pump
10-3hp
1hp Horsepower Automobil e engine
103hp106hp NhomakorabeaAthlete
Power plant
10-3W
1W
103W Watt
106W
109W
FIGURE 1.2 Mechanical engineers work with machines the produce or consume power over a remarkably wide range
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1 OVERVIEW---- an example of mechanical high power