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工程力学双语课件chEquilibrium of a rigid body
1 Chapter 5 Equilibrium of a rigid body Specialized Vocabulary Particle:质点 Support condition:支撑条件 Roller:卷轴; 辊子, 滚轴, 滚子 Cable:缆, 索, 钢丝绳 Pin:钉, 栓, 销; Hinge:铰链; 折[合]叶; 活页; 转轴 Fixed:固定的; 确定的; 不变的; 固执的 Clamp:夹子, 夹钳, 卡钉 Chapter Objectives. .1.Draw complete and accurate free-body diagrams. 2.Write and solve the equations of equilibrium for a rigid body. 3.Describe the equilibrium for two- and three-force bodies. 5.1 Introduction. 5.2 Support conditions for bodies in plane 5.3 Construction of free-body diagrams 5.4 Equations for equilibrium of a rigid body 5.4 Equations for equilibrium of a rigid body 5.4.2 Example. Example 5.4-5.7 (P131). 5.4.3 Problems. Do the problems 5.1-4.36 by yourself, and then I will tell you the answers of them. ③the equations of three moments ③三矩式 Condition: the points A, B and C are not collinear 条件:A,B,C不在同一直线上 ②the equations of two moments ②二矩式 Condition: the axis x is not line AB 条件:x 轴不 AB 连线 5.4 Equations for equilibrium of a rigid body [Example] P and a are given. Determine the reaction forces of the constraints at the point A and B. [例] 已知:P, a , 求:A、B两点的支座反力? Solution: 解: ①investigate beam AB, ①选AB梁研究 ②draw the forces diagram ②画受力图 (If we write “free from constraints” under the diagram, 以后注明 解除约束) free from constraints 解除约束 5.4 Equations for equilibrium of a rigid body ( we can directly draw the reaction forces of the constraints on the original diagram of the whole structure.可把支反力直接画在整体结构的原图上) free from constraints 解除约束 5.4 Equations for equilibrium of a rigid body Therefore, the equations for the equilibrium of the coplanar system of parallel forces are: 平面平行力系的平衡方程为: Condition: line AB is not parallel to the line of the action of the force. 条件:AB连线不能平行于力的作用线 the equations of two moments 二矩式 the equations of one moment 一矩式 5.4 Equations for equilibrium of a rigid body Actually, the x projections of all the forces are zero, .Therefore, there are only two independ
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