《理论力学》课程教学资源（PPT课件，英文）Introduction Theory Mechanics

SITYO1902Theory Mechanics

Theory Mechanics

Introduction. The subject of theoretical mechanics. Research content of theoreticalmechanics The study of theoretical mechanics. The purpose of learning theoreticalmechanics

• The subject of theoretical mechanics • Research content of theoretical mechanics • The study of theoretical mechanics • The purpose of learning theoretical mechanics Introduction

1. The subject of theoretical mechanicsTheoreticalMechanicsThe study of thegenerallaws of mechanical motion of objects.The position of an object in space varies overtime.Including: motionless, movement, rotation,vibration, deformation, flow, wave, diffusion,and so on

1. The subject of theoretical mechanics ——————————————————————— Theoretical Mechanics——The study of the general laws of mechanical motion of objects. The position of an object in space varies over time. Including: motionless, movement, rotation, vibration, deformation, flow, wave, diffusion, and so on

2. Research content of theoretical mechanicsTheoretical mechanics deals with the motion ofmacroscopic objects moving at speeds far lessthan the speed of light. It belongs to the categoryof classical mechanics.Including:1. StaticThe eguilibrium law of an object underMechanics:the action of a force is studied.2. kinematic:Study the description of motion.3. dynamics:Study the relationship between forceand the of change motion

2. Research content of theoretical mechanics ———————————————————————— Theoretical mechanics deals with the motion of macroscopic objects moving at speeds far less than the speed of light. It belongs to the category of classical mechanics. Including: 1. Static Mechanics： 2. kinematic： 3. dynamics： The equilibrium law of an object under the action of a force is studied. Study the description of motion. Study the relationship between force and the of change motion

3. The study of theoretical mechanicsEngineering ProblemAbstractionNotMechanical ModelKMechanicalKnowledgeMathematical ModelMechanicalknowledge &Mathematical toolsConformto Reality?- Analysis CalculationYesOver

3. The study of theoretical mechanics Over Yes Engineering Problem Abstraction Mechanical Model Mechanical Knowledge Mathematical Model Analysis Calculation Mechanical knowledge & Conform Mathematical tools to Reality? Not

4. The purpose of learning theoretical mechanics1. To lay a foundation for solving engineeringproblems;2. The basis for a series of subseguent courses:3. Develop the ability to analyze and solveproblems correctly

4. The purpose of learning theoretical mechanics ———————————————————————— 1. To lay a foundation for solving engineering problems; 2. The basis for a series of subsequent courses; 3. Develop the ability to analyze and solve problems correctly

Mechanical ModelMechanical ModelParticle & Particles' systemWhen the motion range of the object we studied is farbeyond its own geometric size, the shape and size of theobject have little influence on its motion, and its geometricshape and size can be ignored. At this time, it can beabstracted as a particle with only mass but no volume.System of particles -A system consisting of a finiteor infinite number of particles, includes particle, rigidbody, deformed body and fluid, etc

Mechanical Model —— Particle & Particles’ system When the motion range of the object we studied is far beyond its own geometric size, the shape and size of the object have little influence on its motion, and its geometric shape and size can be ignored. At this time, it can be abstracted as a particle with only mass but no volume. System of particles ——A system consisting of a finite or infinite number of particles, includes particle, rigid body, deformed body and fluid, etc. Mechanical Model

Mechanical ModelAn aircraft can beregarded as a particlewhen studying itstrajectory

Mechanical Model —————————————————————— An aircraft can be regarded as a particle when studying its trajectory

MechanicalModelA satellite can be regarded as a particlewhen studying its motion trajectory. Butwhen studying satellite attitude control, itshould be regarded as rigid body

Mechanical Model —————————————————————— A satellite can be regarded as a particle when studying its motion trajectory. But when studying satellite attitude control, it should be regarded as rigid body

Mechanics courseDiscipline classification :General Mechanics: The emphasis is on generalparticle systems and rigid systemsSolid Mechanics: Focus on solid (elastoplastic body)Fluid Mechanics: Focus on fluids (liquids and gases)Character of the subject :Mechanics is a basic subjectMechanics is a technical subjectMechanics is a bridge across science and engineering

Mechanics course ——————————————————————— Discipline classification： General Mechanics：The emphasis is on general particle systems and rigid systems. Solid Mechanics：Focus on solid (elastoplastic body) Fluid Mechanics：Focus on fluids (liquids and gases) Character of the subject ： Mechanics is a basic subject. Mechanics is a technical subject. Mechanics is a bridge across science and engineering