spContent=1) The comprehension of the latest development in modern machinery and mechanisms, as well as the generic process of the conceptual designs of mechanical systems with the establishment of a correct and justified design ideology and historical perspective of mechanical systems.
2) Through the development of the capabilities of modeling, analysis, and evaluation of mechanical system models, to help students to develop innovative design skills when analyzing a solving practical engineering problems.
3) Emphasizes on the cultivation of engineering and innovative thinking. By teaching the basic properties, design principles, and design methods for common mechanisms, let students to master the ability to design basic mechanical systems.
1) The comprehension of the latest development in modern machinery and mechanisms, as well as the generic process of the conceptual designs of mechanical systems with the establishment of a correct and justified design ideology and historical perspective of mechanical systems.
2) Through the development of the capabilities of modeling, analysis, and evaluation of mechanical system models, to help students to develop innovative design skills when analyzing a solving practical engineering problems.
3) Emphasizes on the cultivation of engineering and innovative thinking. By teaching the basic properties, design principles, and design methods for common mechanisms, let students to master the ability to design basic mechanical systems.
—— 课程团队
课程概述
Theory of Machines and Mechanisms is a basic technical subject that aims to cultivate the students’ thinking skills in engineering and the ability of the students to innovatively design mechanical systems. This course is a fundamental course in machinery engineering.
Through the combination of theoretical teaching and practical applications such as experiments and actual machine operation, the students are expected to learn the principles of machine mechanisms and the basic theory and methods of structural designing with the development of the students’ ability to design mechanisms with an intermediate complexity or motion schemes for mechanical systems. Additionally, this course aims to develop the students’ ability to proof, analyze, and evaluate questions in complex locomotive mechanical engineering. At the end of this course, the students are expected to acquire a rudimentary understanding of modern machinery techniques and skills and advanced designing systems that students should be able to operate and apply to practical situations with proficiency. In addition, the students should also obtain an extensive knowledge and develop skills to solve relative practical questions in machinery designing.
授课目标
This course aims to cultivate the ability of the students in innovatively design of mechanisms with an intermediate complexity. Students are expected to learn the principles of machine and mechanism composition, to master the related theories and methods for kinematic analysis, to acquire a good understanding of the methods for the design of various types of mechanisms widely used in industry. At last, the students should obtain an extensive knowledge and develop skills to solve relative practical questions in machinery designing.
课程大纲
Introduction
课时目标:Acknowledge the study objects, goals and primary contents in this course.
1.1 Objectives of this course
1.2 Study objects of the course-machines
1.3 Study objects of the course-mechanisms
Composition of mechanisms
课时目标:Know the plotting methods for simple diagrams of mechanism motions, capable of understanding the simple diagrams and use the diagrams to express design conceptions; understand the conditions for kinematic chains to become mechanisms; understand the calculation method for the degree of freedom of mechanisms; understand the principles of the formation of mechanisms and the methods for structural analysis.The emphasis of this chapter is the calculation of the degree of freedom of planar mechanisms. The difficulty of this chapter is the redundant constraint problems within the calculations for mechanism’s degree of freedom
2.1 Elements of Mechanisms
2.2 Kinematic Chain & Mechanism
2.3 Kinematic diagram
2.4 Degree of Freedom of Mechanisms
2.5 Principle of composition
2.6 Summary
Kinematic Analysis of Mechanisms
课时目标:Learn the purposes and methods for kinematic analysis of mechanisms, especially the graphical method and analytical method. Understand the process of applying the instantaneous center method to conduct velocity analysis for planar mechanisms; understand the process of applying the analytic method to conduct motion analysis for mechanisms;
3.1 Purpose and methods of kinematic analysis
3.2 Instantaneous center of velocity
3.3 Kinematic analysis by using the instantaneous center of velocity
3.4 Kinematic analysis by analytical method
3.5 Summary
Planar Linkage Mechanisms
课时目标:Know all types of planar linkage mechanisms; understand the categorization of planar linkage mechanisms; understand the determinant for the existence of cranks within planar four-bar mechanisms; understand the method to determine the quick-return characteristic of mechanisms; understand the basic methods to design planar linkage mechanisms.The emphasis for this chapter is the performance characteristic analysis, motion analysis, and the design methods of planar linkage mechanisms. The difficulty of this chapter is the design of function mechanisms and the rigid-body guidance mechanisms that have given fixed hinge positions
4.1 Introduction to planar linkage mechanisms
4.2 Conditions of crank existence
4.3 Motion transmission characters
4.4 Force transmission characters
4.5 Design of linkage mechanisms
4.6 Summary
Cam Mechanisms
课时目标:Comprehend the types, characteristics, and the applicable fields of cam mechanisms; understand the process of selecting different types of cam mechanisms when given a task requirement and application field; understand the method of assembling for different displacement curves with different motion patterns; understand the method of selecting or designing the motion pattern of followers according to the performance requirements; understand the principles and methods of determining the basic parameters for cam mechanisms; understand and use with proficiency the reverse method to design the profile of all kinds of cams.The emphasis of this chapter is the design of profile curves of the disk-shaped cams. The difficulty of this chapter is the design of the analysis method for the profile curves of the cams
5.1 Introduction to cam mechanisms
5.2 Working procedure of cam mechanisms
5.3 Follower’s motion
5.4 Introduction to the design of cam mechanisms
5.5 Graphical design of cam mechanisms
5.6 Analytical design of cam mechanisms
5.7 Force transmission of cam mechanisms
5.8 Determination of basic parameters
5.9 Summary
Gear Mechanisms
课时目标:Know the types and application of gear mechanisms; comprehend the principles in machine work of the involute profiles; comprehend the basic parameters, correct meshing conditions, and the calculation of the physical dimensions of nonstandard gears and helical gears; understand the fundamental laws and the conditions of constant drive ratios; understand the undercut phenomenon and the minimum amount of teeth to have no undercuts; understand the meshing characteristics of involute gears; understand the calculations of the physical dimensions and the basic parameters for spur gears; understand the meshing conditions for gears.The emphasis of this chapter is the calculation of geometric dimensions and the meshing conditions for standard involute spur gears. The difficulties of this chapter are the meshing process, the correct meshing conditions, the installation of the gears, the conditions for continuous transmission, the cutting of the profile of the gear, nonstandard gears, etc. for involute gears
6.1 Features and types of gear mechanisms
6.2 Law of gearing
6.3 Involute gear profiles
6.4 Geometrical dimensions of spur gears
6.5 Conditions of mating, installation, and continuous meshing of spur gears
6.6 Manufacturing of gears
6.7 Undercutting and modification manufacturing
6.8 Helical gears
6.9 Bevel gears
6.10 Worm and worm gears
6.11 Summary
Gear Trains
课时目标:Comprehend the categorization of gear trains; Acknowledge the function of gear trains; understand the design of epicyclic gear train and the method to determine the number of gear teeth on each gear; understand the calculation of the transmission ratio for ordinary gear trains, epicyclic gear trains, and combined gear trains.The emphasis for this chapter is the calculation of the transmission ratio for ordinary gear train, epicyclic gear train, and combined gear trains. The difficulty of this chapter is the calculation of the transmission ratio for combined gear trains.
7.1 Definition and classification of gear trains
7.2 Gear ratio of ordinary gear trains
7.3 Gear ratio of epicyclic gear trains
7.4 Gear ratio of combined gear trains
7.5 Design of planetary gear trains
7.6 Applications of gear trains
7.7 Summary
Other mechanisms
课时目标:Comprehend the kinematic characteristics and the working principles of incomplete gear mechanisms and incomplete pin wheel mechanisms; understand the working principles, kinematic characteristic, functions, and designs of ratchet mechanisms, Geneva mechanisms, screw mechanisms, and universal joints.The emphasis of this chapter is the working principles, kinematic characteristics, and the functions of the ratchet mechanism and the Geneva mechanism. The difficulty of this chapter is the method to design all kinds of intermittent mechanisms.
8.1 Introduction
8.2 Ratchet mechanisms
8.3 Geneva mechanisms
8.4 Intermittent gear mechanism
8.5 Screw mechanisms
8.6 Universal joint
Friction and Efficiency of Mechanisms
课时目标:Acknowledge friction characteristics of prismatic pairs and turning pairs and the forces in mechanisms when considering friction. Learn mechanical efficiency and self-locking problems related to friction.
9.1 Friction in kinematic pairs
9.2 Force analysis in mechanisms
9.3 Efficiency in mechanisms
9.4 Bevel transmission
9.5 Summary
Balance of machinery
课时目标:Master methods of static balance and dynamic balance of rigid rotors and balance methods for planar mechanisms. The main contents including: (1) Static balance calculation of rigid rotors; (2) Dynamic balance calculation of rigid rotors; (3) Balance methods of planar mechanisms.
10.1 Introduction
10.2 Static balance of rigid rotors
10.3 Dynamic balance of rigid rotors
10.4 Balance test of rigid rotors
10.5 Brief introduction of balance for mechanisms
10.6 Summary
Kinetics of mechanical systems
课时目标:Acknowledge the undesirable effects of speed fluctuation; comprehend the relationship between the work done by an outer force and the change of operational speed of driving parts during operations of the machine; understand the principle of using flywheels to regulate the periodic speed fluctuation in machines; understand the method to solve for the equivalent rotary inertia and equivalent torque; capable of establishing the equivalent kinematic model for single degree of freedom of mechanical systems; capable of solving for the real motion for mechanical systems when the equivalent torque is a function of mechanical position function; capable of calculation of the moment of inertia of the flywheel during the regulation of periodic speed fluctuation in mechanical systems.The emphasis of this chapter is the establishment of equivalent kinematic models, solving for real motion, and the regulation of periodic speed fluctuation. The difficulties for this chapter are the evaluation for real motion and the regulation of speed fluctuation.
11.1 Introduction
11.2 Equivalent kinetic model
11.3 Determination of actual motion
11.4 Control of speed fluctuation
11.5 Summary
展开全部
预备知识
Advanced Mathematics, Mechanical Drawing, Theoretical Mechanics
参考资料
1. Norton R. L., Design of Machinery: An Introduction to Synthesis and Analysis of Mechanisms and Machines, Third Edition, McGraw-Hill Inc., 2004
2. David H.Myszka, Machines & Mechanisms: Applied Kinematic Analysis, Fourth Edition, Pearson, 2010
3. 郭卫东.2013.机械原理.第2版.北京:科学出版社