1.1.1 Definition of Mechanical EngineeringWHO ARE MECHANICAL ENGINEERS?---an exampleFiGURE1.4Robotsareextensivelyusedinautomatedindustrialassemblylinesandinmanufacturing applications that require precision when repetitive tasks are beingperformed,asintheassemblyandarcweldingoperationsshownhere.Source:ReprintedwithpermissionofFANUCRoboticsNorthAmericaInc11
② WHO ARE MECHANICAL ENGINEERS?-an example FIGURE 1.4 Robots are extensively used in automated industrial assembly lines and in manufacturing applications that require precision when repetitive tasks are being performed, as in the assembly and arc welding operations shown here. Source: Reprinted with permission of FANUC Robotics North America Inc. 11 1.1.1 Definition of Mechanical Engineering
1.1.1 Definition of Mechanical EngineeringWHOAREMECHANICALENGINEERS?-.-- Computer-aided engineering technology (examplesANSYMREModelExperimentFIGURE1.6ContactstressFIGURE1.7ThestampingFIGURE1.5Vibrationanalysisandanalysis ofrollinggear（齿轮滚processoftherear suspensionexperiment(振动分析与实验）动接触应力分析springbearingofacar(轿车后悬架弹簧支座冲压过程-丰建E11鑫11FIGURE1.8rolling(轧制）FIGURE1.9Injectionmolding(注FIGURE1.1oMovementofarmor塑成形)piercingfragments(穿甲碎片的运动2
② WHO ARE MECHANICAL ENGINEERS?- - Computer-aided engineering technology (examples) FIGURE 1.6 Contact stress analysis of rolling gear (齿轮滚 动接触应力分析) FIGURE 1.8 rolling(轧制) FIGURE 1.9 Injection molding(注 塑成形) FIGURE 1.5 Vibration analysis and experiment(振动分析与实验) FIGURE 1.7 The stamping process of the rear suspension spring bearing of a car(轿车后 悬架弹簧支座冲压过程) FIGURE 1.10 Movement of armor piercing fragments(穿甲碎片的运动12) 1.1.1 Definition of Mechanical Engineering
1.1.1 Definition of Mechanical Engineering Definition of Mechanical Engineering----discipline ofmechanical engineeringmachinecomponentsWhat"elementsforcesis concerned inthe discipline ofmaterialsmechanicalenergyengineering ?motion13
③ Definition of Mechanical Engineering-discipline of mechanical engineering 13 machine components forces materials energy motion What "elements” is concerned in the discipline of mechanical engineering ? 1.1.1 Definition of Mechanical Engineering
1.1.1 Definition of Mechanical EngineeringDefinition of Mechanical EngineeringMechanical engineering (ME) is the discipline that applies engineering.physics, engineering mathematics, and materials science principles to designanalyze,manufacture,andmaintainmechanical systems.It isone oftheoldestandbroadestoftheengineeringdisciplines.l机械工程（ME）是应用工程、物理、工程数学和材料科学原理设计、分析、制造和维护机械系统的学科。它是最古老和最广泛的工程学科之一。14
③ Definition of Mechanical Engineering 14 Mechanical engineering (ME) is the discipline that applies engineering, physics, engineering mathematics, and materials science principles to design, analyze, manufacture, and maintain mechanical systems. It is one of the oldest and broadest of the engineering disciplines.\ 机械工程（ME）是应用工程、物理、工程数学和材料科学原理设计、分 析、制造和维护机械系统的学科。它是最古老和最广泛的工程学科之一。 1.1.1 Definition of Mechanical Engineering
1.1.2 History of Mechanical EngineeringA Historical Review of the Development of Machinery--Ancient ChinaThe use of simple textile machinery （纺织机械） began five thousand years ago;The cam principle was applied to the connecting machine spine and water mill in Jin Dynasty;In the Western Han Dynasty, the guide car and Jili drum car were made by applying the principle ofwheeltraintransmission;The weathering geodynamometer invented by Zhang Heng in the Eastern Han Dynasty is the firstseismograph intheworld;Bronze bushes and herringbone gears, which are still used in many machines, canbe found in the cultural relics of the Eastern Han Dynasty.InancientChina,thereweremanyoutstandinginventionsand creations in mechanicalresearch and development.15
⚫ A Historical Review of the Development of Machinery- Ancient China 1.1.2 History of Mechanical Engineering The use of simple textile machinery （纺织机械）began five thousand years ago； The cam principle was applied to the connecting machine spine and water mill in Jin Dynasty； In the Western Han Dynasty, the guide car and Jili drum car were made by applying the principle of wheel train transmission； The weathering geodynamometer invented by Zhang Heng in the Eastern Han Dynasty is the first seismograph in the world； Bronze bushes and herringbone gears, which are still used in many machines, can be found in the cultural relics of the Eastern Han Dynasty. In ancient China, there were many outstanding inventions and creations in mechanical research and development. 15