Course Outline
MENG471 MECHANISMS
Year and Semester
:
FALL SEMESTER 2014
Instructor
Room
Phone
e-mail
Office Hours
:
:
:
:
:
Assoc. Prof. Dr. ERBİL AKBİL
ME Building 200 B
(0392) 630 1045,
Mobile: 0533 861 2245
erbil.akbil@emu.edu.tr
Tuesday 1, 2 & Friday 1, 2 Periods; other (by appointment)
Assistant
Room
Phone
e-mail
:
:
:
:
Sina Ghafoorpoor Yazdi
ME Building 200 A
(0392) 630 1614,
Mobile: 0533 888 6107
sina.ghy@gmail.com
Course Schedule
:
Tuesday 6, 7; Wednesday 7 (Tutorial); & Friday 3, 4 Periods
Catalog Description:
MENG471
Mechanisms (4,1) 4
Introduction: Kinematics fundamentals; degrees of freedom; types of motion; links, joints, and
kinematic chains; mobility analysis; mechanisms and structures; number synthesis; kinematic
inversion; four-bar mechanisms; the Grashof condition; linkages more than four-bars; springs as links.
Position, velocity, and acceleration analysis; position and displacement; transmission angles; toggle
positions. Linkage synthesis: Types of kinematic synthesis; graphical linkage synthesis; analytical
linkage synthesis; two and three position synthesis. Cam terminology and cam design. Gears and gear
trains; the fundamental law of gearing. Examples of intermittent motion mechanisms.
Pre/Co-requisite(s)
:
MENG233
Prerequisite by Topic:
The student taking this course will be expected to have a good background in physics, engineering
mechanics, linear algebra, trigonometry, and to have some computer programming capabilities.
Textbook: Design of Machinery, 1st. SI Edition, By R.L. Norton, McGraw-Hill, 2009.
References: Mechanisms, 3rd. Ed., by Erez Söylemez, METU Basım İşliği, Ankara-Turkey, 1999.
Course Objectives:
1. To introduce the concepts of analysis and synthesis of mechanisms.
2. To develop graphical and analytical synthesis techniques and problem formulation and
solution skills.
3. To develop a broad and basic comprehension of different methods of analysis for the
determination of motion characteristics of linkage mechanisms.
4. To develop an ability to solve mechanism problems that may involve selection, specification,
design and sizing of mechanisms to accomplish a given task.
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Course Outline
Course Outcomes:
After successfully completing this course, the student will acquire or enhance the following
knowledge and skills:
1. The terminology associated with kinematics and mechanisms.
2. Mobility of planar and spatial linkages.
3. Determination of motion characteristics of linkages.
4. Analytical vector and complex number methods applied to linkage design.
5. Analytical and graphical methods for finding linkage velocities and accelerations.
6. Design and selection of linkage mechanisms for specific applications.
7. Design and analysis of cam and gear mechanisms
8. Synthesis of linkages to produce predetermined motion.
9. Critical thinking applied to mechanism design.
10. Engineering creativity.
Course Outline
The topics, which will be covered in this course, include:
WEEK #
TOPICS
1.
Introduction: Scope and general principles; mechanisms and machines; links, joints, and
kinematic chains; degree of freedom; mechanisms and structures; number synthesis;
linkage transformation; kinematic inversion. [Norton: §1.1-1.6, §2.1-2.6]
2.
The Grashof condition; classification of four-bar linkages; linkages more than four bars;
six-bar linkages; geared five-bar linkages; rotatibility criteria; springs as links. Practical
considerations.[Norton: §2.12-2.13, §2.14-2.15]
3.
Graphical linkage synthesis: Function, path, and motion generation; limiting conditions;
dimensional synthesis; [Norton: §3.1-3.4]
4.
QUIZ 1 (Tentative!) Quick return mechanisms; coupler curves; cognates; straight-line
mechanisms; dwell mechanisms. [Norton: §3.5-3.9]
5.
Position analysis: Position and displacement; translation, rotation, and complex motion;
graphical position analysis of linkages; algebraic position analysis; the four-bar slidercrank and inverted slider-crank position analysis; [Norton: §4.1-4-7]
6.
Position analysis of linkages more than four-bar; position of any point on a linkage;
transmission-angle; toggle positions; circuits and branches of linkages [Norton: §4.84.12].
7.
MIDTERM EXAMINATION [To be announced!]
8.
Velocity Analysis: Graphical velocity analysis; Instant centers; velocity analysis with
instant centers; centrodes; velocity of slip; analytical velocity analysis; the geared five-bar
linkage; velocity of any point on a linkage. [Norton: §6.1-6.9]
9.
Acceleration Analysis: Graphical acceleration analysis; analytical solutions; the geared
five-bar linkage case; acceleration of any point on a linkage. Jerk. [Norton: §7.1-7.7]
10.
Analytical Linkage Synthesis: Types of kinematic synthesis; precision points; twoposition motion generation; two-position synthesis; three-position motion generation;
[Norton: §5.1-5.6]
11.
Synthesis for a specified fixed pivot location; center-point and circle-point curves;
synthesis of path and function generators; other methods [Norton: §5.8-5.13]
12.
QUIZ 2 (Tentative!) Cam design: Cam terminology; position, velocity, acceleration, and
jerk (SVAJ) diagrams; [Norton: §8.1-8.2]
13.
Single and double-dwell cam design; polynomial functions; sizing of a cam; critical path
motion; practical design considerations. [Norton: §8.4-8.9]
14.
Constant Velocity-Ratio Mechanisms: Gear and belt drives; fundamental law of gearing;
gear tooth; contact ratio; gear types; simple and compound gear trains; planetary gear
trains; efficiency of gear trains; belt drives. [Norton: §9.1-9.10]
15. FINAL EXAM [To be announced!]
16. Submission of Term Projects (With the Final Exams!)
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Course Outline
Computer Usage:
Excel programming will be used in different assignments throughout the course. Some application
software will be utilized in the design, analysis, and computer simulations and/or animations of motion
of some selected mechanisms.
Students are encouraged to use Internet to search for various topics, including contents of similar
courses offered elsewhere. Students can reach teaching material, solved problems, data sheets etc. on
the allocated Web sites.
Teaching Techniques:
PowerPoint and DryMarker-and-board will both be used in classroom presentations. Tutorials are
organized to review some key points and help establish a closer contact with students.
Laboratory/Studio Works:
There will be a total of 2 laboratory sessions. During these visits to the Mechanisms Laboratory, the
students will get acquainted with working models of different mechanisms and will be exposed to
several demonstrations involving straight-line motion, constant velocity motion, intermittent motion,
path generation, gear and cam mechanism applications.
Design Projects
Students will be given two design projects: The first one will be a team project that may involve the
design of a linkage mechanism, such as a straight-line motion mechanism to perform a specified task
or writing a computer program to help for the analysis or synthesis of a linkage mechanism. The
second project will require individual effort of each student and may involve either an analysis of an
existing mechanism/machine or synthesis of a new mechanism to perform a prescribed task.
Grading
- 2
- 1
- 2
- 1
Policy
Quizzes @ 7 % each
Midterm Exam
Project Work s
Final Examination
= 14 %,
= 20 %,
= 26 %
= 40 %,
Attendance:
Attendance records will be taken. You must be there to participate. If you miss more than one exams
or if your attendance during the semester (for any reason) falls below 75 %, your condition will be
considered as “Non-Gradable”, which may end up with an “NG” grade.
Prepared By: Assoc. Prof. Dr. Erbil Akbil
(Fall 2014-2015, EMU)
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