机械原理英语版
机械原理英文版答案
C 1
b a
B 2
C 2
θ
Ψ
m a x D
c
ω
1
A
d
B 1
(e) will any dead-point occur during the whole cycle of the motion? No. (d) find the maximum pressure angle αmax and the minimum transmission angle γmin. γmin =min{γmin′, γmin′′} 不能只求γmin′ !!!
C2 C1 B2 A B1 max
=0°
D
C 1
b a
B 2
C 2 m a x D
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A B 1 F
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V
若DC为原动件，图示两位置的γ不是γmin！！
γ
γ
4-5 In the offset slider-crank mechanism shown in Fig.4-5, the driver crank AB rotates at a constant speed. Let LAB=120mm, LBC=250mm, offset e=60mm, and ϕAB=60o. Find
机械原理英文Mechanical principles
十四、Mechanical principlesDegrees of freedomIn mechanics, degrees of freedom are the set of independent displacements and/or rotations that specify completely the displaced or deformed position and orientation of the body or system.FormulaPl——lower pair , surface contactPh——higher pair , point or line contactn——activity component3——every component have 3 degrees of freedom 2——lower pair have 2 degrees of freedom1——high pair have 1 degrees of freedomF>1 , we can not know what happen next timeF=1 , we can know what happen next timeF=0 , mechanics will not move三审，笔试，有三个图，分别计算哪个结构是稳定的，第一个是稳定的，第二个是稳定但是有过度约束，第三个不稳定可运动。
在过度约束中，审核官问我知道不知道一个公式s=2k-3,我不明白，回来和同学讨论觉得这个应该是计算虚约束的公式，请多注意。
Plane mechanism`s motion analysisInstantaneous center of velocityRevolute pair join, two mechanism , instantaneous center of velocity in center of revolute pair.Rod 1 and rod 2 are combined by revolute pair, P12 is instantaneous center of velocity.Pure-slide pair join, two mechanism , instantaneous center of velocity infinite distance of vertical motion direction.A move along rod B. P12 in infinite distance of vertical rodB .High pair join , two mechanism , they are pure rolling , instantaneous center of velocity in contact point of two mechanism.P12 is instantaneous center of velocityHigher pair join , two mechanism , they are relative slide , instantaneous center of velocity in base tangent.P12 in t-t.Kennedy-Aronhold theoremP13 in P12 and P23 join line. P13 in P14 and P34 join line. P24 in P12 and P14 join line. P24 in P23 and P34 join line.2 and 4 velocity is same in P24Plane four bar mechanismA and D fix called stander , AB CD called side link. Link can rotation called crank--ABLink can shake in range of degree called rocker--CD Crank-rocker mechanismRadarDouble-crank mechanismTrain wheelDouble-rocker mechanismCraneCam mechanismAdvantag e: structure is simple, respond is quickly. Disadvantage: cam produce is difficult, easily wear between cam and follower.GearA gear is a component within a transmission device that transmits rotational force to another gear or device. Spur gearSpur gear are used for low speed applications and those situations where noise control is not a problem.Helical gearHelical gear operate more smoothly than do spur gear. The use of helical gears is indicated when the application involves high speeds , large power transmission or where noise abatement is important,A disadvantage of helical gear is a resultant thrust along the axis of the gear , which needs to be accommodated by appropriate thrust bearing , and a greater degree of sliding friction between the meshing teeth , often addressed with specific additives in the lubricant. Double helical gearsDouble helical gears , also know as herringbone gears , overcome the problem of axis thrust presented by single helical gears by having teeth that set in a "V" shape. Bevel gearThe angle between the shafts can be anything except 0 and 180 degree.Worm gearThe prime feature of a worm-and-gear set is that it allows the attainment of a high gear ratio with few parts in a small space.Rack and pinionTorque cam be converted to linear force by meshing a rack with a pinion : the pinion turns the rack moves in a straight line.Planet gear。
机械原理英语
机械原理英语Mechanical Principles in English。
Mechanical principles are the foundation of engineering and technology. Understanding these principles is crucial for anyone working in the field of mechanical engineering. In this document, we will discuss some of the key mechanical principles in English.First and foremost, it is important to understand the concept of force. Force is a vector quantity that can cause an object to accelerate, decelerate, or change direction. It is measured in units of newtons and is represented by the symbol F. The magnitude and direction of a force are essential in determining its effect on an object.Next, let's consider the concept of work and energy. Work is done when a force acts on an object to move it a certain distance. The amount of work done is equal to the force applied multiplied by the distance moved in the direction of the force. Energy, on the other hand, is the ability to do work. There are different forms of energy, including kinetic energy (energy of motion) and potential energy (energy of position).Another important mechanical principle is the study of simple machines. Simple machines are basic mechanical devices that apply a force to accomplish work. The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw. These simple machines can be combined to create more complex machines that make work easier.Furthermore, it is crucial to understand the concept of mechanical advantage. Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device, or machine system. It is calculated by dividing the output force by the input force. Understanding mechanical advantage is essential for designing and optimizing mechanical systems.Additionally, the study of motion and its principles is fundamental in mechanical engineering. Motion is described in terms of displacement, velocity, and acceleration.The laws of motion, formulated by Sir Isaac Newton, are the foundation of classical mechanics. These laws describe the relationship between the motion of an object and the forces acting on it.Moreover, the study of fluid mechanics is essential in understanding the behavior of fluids (liquids and gases) and their interactions with solid objects. Fluid mechanics plays a crucial role in various engineering applications, including the design of pumps, turbines, and hydraulic systems.In conclusion, the study of mechanical principles in English is essential for anyone working in the field of mechanical engineering. Understanding concepts such as force, work and energy, simple machines, mechanical advantage, motion, and fluid mechanicsis crucial for designing and optimizing mechanical systems. By mastering these principles, engineers can develop innovative solutions to complex engineering problems and contribute to the advancement of technology and society.。
机械原理英语版
Characteristics:
(1) It is a composition of links.
（人为构件的组合体）
(2) There is a determined relative motion between links.
（各构件之间有确定的相对运动）
(3) It can transform or transmit energy.
15
References
8 . Erdman A. G., Sandor G. N., Mechanism Design: Analysis and Synthesis, Prentice-Hall International Inc, 1984 9*. Eckhand H. D., Kinematic Design of Machines and Mechanisms , McGraw-Hill, 1998 10*. Shigley J. E. and Uicker J.J. Theory of Machines and Mechanisms, McGraw-Hill, 2nd edition, 1995 11*. Norton R. L., Design of Machinery – An Introduction to the Synthesis and Analysis of Mechanisms and Machines, McGraw-Hill, 2nd edition, 2001 * 影印版，机械工业出版社，2002
（国际机构与机器理论联合会）
2. Kinematics and Dynamics
(High speed, precision, efficiency, etc.)
（高速，高精度，高效率等）
机械原理中英文对照
径向槽 运动循环 运动系数 顶锥角 根锥角 顶隙
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Cam Gear Gear train
凸轮（机构） 齿轮（机构） 齿轮系
Statics
Indexing mechanism
间歇运动机构
1
1 Composition and Mobility of Planar Mechanisms
Planar mechanism Mobility
Links Kinematic pairs Joints Elements Revolute Hinge Slider Cam pair Compound hinge Local DOF
0 Introduction
Machinery Machine Mechanism Link Kinematic pair Linkage 机械 机器 机构 构件 运动副 连杆（机构） Displacement Velocity Acceleration Kinematics Dynamics Kinetics 位移 速度 加速度 运动学 动力学 动力学（一般特指 在分析受力时考虑 物体所受的惯性力） 静力学
螺旋线 渐开螺旋面 端面 法面
Superscript Subscript Lead Ellipse
上标 下标 导程 椭圆
9
5 Gear Trains
Spur gears Helical gears Pinion Rack Bevel gears Worm Worm wheel External gears Internal gears Gear train with fixed axes Epicyclic gear train 直齿轮 斜齿轮 小齿轮 齿条 圆锥齿轮 蜗杆 蜗轮 外啮合齿轮 内啮合齿轮 定轴轮系 周转轮系 Planetary gear train Differential gear train Combined gear train Train ratio Sun gear Planet gear Planet carrier Peripheral velocity 行星轮系 差动轮系 复合轮系 （轮系的）传动比 太阳轮，中心轮 行星轮 转臂 圆周速度
机械原理英语版范文
机械原理英语版范文Mechanical PrinciplesIntroductionMechanical principles are the fundamental concepts and laws that govern the behavior and functions of machines and mechanical systems. These principles form the basis of mechanical engineering, providing engineers with the tools and knowledge necessary to design, analyze, and optimize mechanical systems. Understanding mechanical principles is essential for anyone working in the field of mechanical engineering.Newton's Laws of MotionOne of the most fundamental mechanical principles isNewton's laws of motion. These three laws describe the relationship between the motion of objects and the forces acting upon them. The first law states that an object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant velocity, unless acted upon by an external force. The second law states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. The third law states that for every action, there is an equal and opposite reaction.Mechanical AdvantageFrictionFriction is another important mechanical principle. It is the force that opposes the relative motion of two surfaces in contact with each other. Friction can be both beneficial and detrimental. On one hand, it allows us to walk, drive vehicles, and hold objects without slipping. On the other hand, it causes a loss of energy and wear and tear in mechanical systems. Engineers must take friction into account when designing machines to ensure they function efficiently and reliably.TorqueStress and StrainConclusionThese are just a few of the many mechanical principles that form the foundation of mechanical engineering. By understanding these principles, engineers can design efficient and reliable machines that meet the needs of society. Mechanical engineering continues to advance, with new technologies and principles being discovered and applied every day. The principles discussed here provide a solid starting point for aspiring mechanical engineers to build upon as they delve deeper into the field.。
机械原理英语作文模板
机械原理英语作文模板英文回答：Mechanical Engineering Principles。
Mechanical engineering principles are the fundamental concepts and laws that govern the behavior of mechanical systems. These principles provide a framework for understanding how machines and devices function, and how to design and analyze them.Some of the most important mechanical engineering principles include:Newton's laws of motion: These laws describe the relationship between an object's mass, velocity, and acceleration. They are essential for understanding how forces affect objects.Energy conservation: This principle states that energycannot be created or destroyed, only transferred or transformed. It is a fundamental principle of physics that applies to all mechanical systems.Momentum conservation: This principle states that the total momentum of a system remains constant, as long as there are no external forces acting on it. It is a fundamental principle of physics that applies to all mechanical systems.Angular momentum conservation: This principle states that the total angular momentum of a system remains constant, as long as there are no external torques acting on it. It is a fundamental principle of physics that applies to all mechanical systems.Elasticity: This property describes the ability of a material to deform under stress and then return to its original shape when the stress is removed. It is an important property for many mechanical systems, such as springs and shock absorbers.Plasticity: This property describes the ability of a material to deform permanently under stress. It is an important property for many mechanical systems, such as metals and polymers.Strength: This property describes the ability of a material to resist deformation or fracture under stress. It is an important property for many mechanical systems, such as beams and columns.Stiffness: This property describes the resistance of a material to deformation under load. It is an important property for many mechanical systems, such as springs and shafts.These are just a few of the many mechanical engineering principles that are used to design and analyze mechanical systems. By understanding these principles, engineers can create machines and devices that are safe, efficient, and reliable.中文回答：机械原理。
机械原理第一章cup英文版
Course information and requirements
Information
Shimin Zhang（张仕民） Office: Rm. 602, New Bldg. Tel.: 89733835(o) E-mail: smzhang@
Course information and requirements
How to analyze mechanism & How to synthesize mechanism？
What are we going to study in this course?
The Content of our course
It is broadly divided into two parts. 1. Kinematics of Mechanism: the study of motion
mechanisms & How to synthesize mechanisms
What are we going to study in this course?
Example of the Machines and Mechanisms
Mechanisms: pencil sharper, clock, folding chair, adjustable desk lamp, bike Machines: robots, bulldozer, park rides, elevator, engine. Can you give more examples? Some Mechanisms widely used in our life.
How to become an engineer