第1章《工程力学》结论.ppt

工程力学双语课件
辽宁省第八届教育软件大赛参赛作品
Chapter 1 Exordium
工程力学
engineering mechanics
第一章绪论
本章目标
chapter objectives
工程力学研究什么问题?
What is the contents of engineering mechanics?
工程力学怎样研究问题?
How to study the knowledge of engineering mechanics?
工程力学的研究对象是什么?
What is the studied object of engineering mechanics?
工程力学的研究对象
The studied objects of engineering mechanics
刚体
rigid body
就是在力的作用下,大小和形状都不变的物体
There is no deformation whenever a body subjected to any force
变形体
deformable body
在外力作用下,一切固体都将发生变形(尺寸和形状),故称为变形体。
It will tend to create the change of shape and size whenever a
body subjected to any force,we caller the changes deformation
and the body is called deformable solid body.
如图所示桥式起重机的主梁、吊钩、钢丝绳;悬臂吊车架的横梁AB,
斜杆CD都是工程力学的研究对象,工程上称为构件。
The crane is shown as in Fig 1-1,the principle beam, pothook,steel
cord ,the beam AB and the member CD are all studied bodies ,they
are called elements in engineering.
工程力学的研究内容
The contents of engineering mechanics
静力学
statics
主要研究刚体在力作用下的平衡问题,即根据力系平衡条件
分析平衡刚体的受力情况,确定各未知力的大小和方向,是
构件承载能力计算的基础。
Statics deals with the equilibrium of bodies,that is ,those that are
either at rest or move with a constant first step to solving
most mechanics problems requires drawing a diagram ,this step is
particularly important when solving equilibrium problems,and for
this reason drawing free-body diagrams is strongly emphasized
throughout the book.
物体的受力分析
the analysis of forces acted to the bodies
力系的等效简化
equivalent reduction of force systems
本篇主要研究三方面问题
we will study three problems in this part
力系的平衡条件及其应用
conditions and applying of equilibrium of force systems
工程静力学(statics)的理论和方法不仅是工程构件静力设计
的基础,而且在解决许多工程技术问题中有着广泛应用。
The principles and methods of statics are the basis of design,
They are widely applied in many engineering technology problems.
建立的力学模型
force model established
发动机原理图
Work principle of motor
静力学分析过程
procedures of analysis of statics
NA
NB
NO
NA’
M
N1
N2
NB’
构件承载能力计算(材料力学)
The analysis of ability