Turbomachinery Laboratory at Hanyang University. Rotordynamics. Bearings. Seals. Dampers.

Hanyang University Department of Mechanical Engineering

Last revised: Nov. 15, 2023

COE2004 Dynamics

1. Class information
• Class Year and semester: 2022, Fall semester
• Course No. : COE2004
• Course title: Dynamics
• Credit-Lecture Hour-Practice Training: 3.00-3.00-0.00
• Course outline: Two 90-min. lectures/week
• Organizing Department: Mechanical Engineering

2. Instructor information
• Name: Dr. Keun Ryu
• Department: Mechanical Engineering
• Email: kryu@hanyang.ac.kr
• Web: http://turbolab.hanyang.ac.kr/COE2004.html

• Office hours: By scheduled appointment (E-mail in advance required)
• About office hours: This is to encourage individual interaction between the students and the instructor. Students should prepare by organizing questions in advance.
　

3. Course objective
To introduce fundaments for modeling mechanical systems, to derive differential equations of motion (kinetics and kinematics), find (predict) the dynamic response of systems using mathematical analysis, and to provide knowledge for practice in understanding mechanical systems behavior.

4. Course Description (IC-PBL) :
Students will learn how to Identify, analyze, formulate and solve engineering problems involving accelerating motion. We will also learn how to apply knowledge of mathematics, science and statics to solve dynamics problems.
　

* Note that this class follows the IC-PBL format.

The IC-PBL is an "industry-linked, problem-based, project course method" focused on the development of various capabilities required for future leaders of society.

5. Textbook

Title: Mechanics for Engineers, Dynamics, 14th Edition in SI Edition, Global Edition.
Author: R.C. Hibbeler
Available in the University Bookstore

6. Grading
• Homework (10%), Mid-term Exam (40%), Final Exam (40%), Attendance (5%), and Class participation (5%)
• For full credit, homework should be presented in a professional way, including the problem(s) statement and objective, the steps in the modeling and procedure of solution, including a nomenclature and a sound discussion of the results obtained.

• There will be NO partial credit for mishandling of physical units.

• Attendance to the lectures is a must for success.

• About Exams: Two in-class exams. No make-up exams will be given.

7. One minute paper
At end of class, the instructor will request students to fill “One Minute Paper” to establish their degree of understanding and address to questions or issues still unanswered. Please download the template.

8. Group Project: IC-PBL Subject

Problem statement (scenario):
Build your own simple gyroscope and present the fundamental physics in your prototype.

The objectives of the current group project are as follows:
TBA

At the end of the semester (week 15), the final report and presentation must have the following outline and contents:
TBA
　

Demonstration of gyroscope

https://youtu.be/ty9QSiVC2g0

https://youtu.be/NeXIV-wMVUk

https://youtu.be/vqHXFKJddfM

https://youtu.be/5cRb0xvPJ2M

https://youtu.be/cquvA_IpEsA

https://youtu.be/xQb-N486mA4

Recommended URL resources RESOURCES on the web (there are a million more, below is just a minuscule sample)
https://en.wikipedia.org/wiki/Gyroscope

Mechanics: The Gyroscope (1 of 5) The Concept of Torque Revisited: https://youtu.be/bYF0PGsF92k

Mechanics: The Gyroscope (2 of 5) The Torque of a Non-Spinning Gyroscope: https://youtu.be/ho2P3KHhEMQ

Mechanics: The Gyroscope (3 of 5) The Torque of a Spinning Gyroscope: https://youtu.be/qS_dcNqs3d4

Mechanics: The Gyroscope (4 of 5) Why Does the Precession Velocity Change?: https://youtu.be/WR7hqUq7aNQ

Mechanics: The Gyroscope (5 of 5) Cool Demonstration of Gravity Defying: https://youtu.be/fv_AinDLHJY

Gyroscopic Precession is Easier Than You Think!: https://youtu.be/mRZGdvJQnPU

Gyroscopic precession -- An intuitive explanation: https://youtu.be/n5bKzBZ7XuM

Scientific toy: https://youtu.be/8r1sOVkH7ao

- Gyroscopic Instruments: https://youtu.be/hVsx4XWafXg

- Gyroscopic Instruments - U.S. Navy Aviation Training Film (1960): https://youtu.be/JnKloSdUJLo

- https://youtu.be/nBci3aQJHCk

- http://gmkt.kr/gCLiM-K

- https://m.blog.naver.com/PostView.naver?isHttpsRedirect=true&blogId=jaramsci1208&logNo=221317328255

Rules for Group Formation and Weekly Presentation
- 5 students/group
- Group presentation for group assignments: 15~20 minutes for each group, 5 minute for discussion
- Total #s of Slides: 15~20 pages
The weekly presentation must show the 1) Problem statement, 2) Goal, 3) Brief introduction, 3) Justification/Motivation, 4) Scope, 5) Tasks, 6) Methodology, and 7) Schedule for the project. Recall Template for weekly task plan.

Need more information about literature review?

- See Guideline for Literature Review

- https://writingcenter.tamu.edu/Grads/Writing-Speaking-Guides/Alphabetical-List-of-Guides/Academic-Writing/Literature-Reviews

- https://youtu.be/9la5ytz9MmM

NOTE: Important support announcement from Innovation Center for Engineering Education: Notice, Application form

9. No Plagiarism Policy
Plagiarism consists of passing off as one’s own ideas, words, writings, etc., which belong to another. Plagiarism is one of the worst academic sins, for the plagiarist destroys the trust among colleagues without which knowledge and learning cannot be safely communicated.

10. Lecture material and topics

• Week 1 (Sep. 6)

1) Welcome to COE2004 Dynamics class!

- Class information, Course objective, Course introduction, Textbook, Grading, Lecture topics
- Method of class teaching, Other class policy

- Instructor information (http://turbolab.hanyang.ac.kr/director.html)
- About yourself

• Week 2 (Sep. 13)

1) Introduction to Dynamics (Chap. 12.1)

Galileo's "falling bodies" experiment re-created at Pisa: https://youtu.be/_Kv-U5tjNCY

Apollo 15 falling objects experiment: https://youtu.be/ZVfhztmK9zI

Brian Cox visits the world's biggest vacuum | Human Universe - BBC: https://youtu.be/E43-CfukEgs

The Pendulum and Galileo: https://youtu.be/MpzaCCbX-z4

Mechanical Energy Conservation: https://youtu.be/9gUdDM6LZGo?t=2736 (Start at 45:36)

2) Chap. 12 Kinematics of a Particle: Note 1

Quick review: Basic Calculus
See Appendix A through Appendix C in your textbook.

Radius of Curvature: Proof and Examples

3) HW Assignment 1

- Read the article "What You Don’t Necessarily Learn in School" by Dave Wisler.
- Report format: Minimum 1 page (up to 2 pages)

- Due: Oct. 04, 2022
- What I expect from you:
· Justification: why is this important (to you)?
· Brief summary of the article
· Answers for two questions
Q1) What is the issue or issues that impacted you more?
Q2) Discuss about how to embrace the needs of an engineering career.
· What was learned?

• Week 3

Chap. 13 Kinetics of a Particle: Force and Acceleration: Note 2

Angles between Tangent Lines and Radial Vectors in Polar Coordinates
- Homework 1 (Study for Quiz): Examples 12.3 / 12.7 / 12.10 / 12.13 / 12.14 / 12.15 /12.18 / 12.20/ 12.23 / 12.24 / 12.26 /12.27

• Week 4

Chap. 14 Kinetics of a Particle: Work and Energy: Note 3
- Homework 2 (Study for Quiz): Examples 13.2 / 13.4 / 13.5 / 13.7 / 13.8 / 13. 10 / 13.11 / 13.12

- Quiz 1

• Week 5

Chap. 15 Kinetics of a Particle: Impulse and Momentum: Note 4

- Homework 3 (Study for Quiz): Examples 14.1 / 14.3 / 14.5 / 14.6 / 14.8 / 14.9 / 14.11

• Week 6

Chap. 16 Planar Kinetics of a Rigid Body: Note 5
- Quiz 2: Directly taken from HWs 1, 2, and 3

- Homework 4 (Study for Mid-term exam): Examples 15.2 / 15.4 / 15.8 / 15.10 / 15.11 / 15.12 / 15.15/ 15.17

• Week 7 (Oct. 18, 2022)

Review: Chap. 12 ~ 16.

* Magazine article about Prof. Keun Ryu's research: HYPER (Hanyang Perspective), 2021 Autumn, Vol. 259, pp. 24-29

• Week 8 (Oct. 25, 2022)

Mid-term exam: Nov. 1

• Week 9 (Nov. 1, 2022)

Chap. 17 Planar Kinetics of a Rigid Body: Force and Acceleration: Note 6

- Homework 5 (Study for Quiz): Examples 16.5 / 16.6 / 16.8 / 16.9 / 16.11 / 16.12 / 16.13

• Week 10 (Nov. 8, 2022)

Chap. 18 Planar Kinetics of a Rigid Body: Work and Energy: Note 7
- Homework 6 (Study for Quiz): Examples 17.4 / 17.8 / 17.11 / 17.12 /17.14 / 17.15
- Homework 7 (Due date: Nov. 22, 2021): The Fabric of the Cosmos (https://www.pbs.org/wgbh/nova/series/the-fabric-of-the-cosmos/)

The Fabric of the Cosmos: The Illusion of Time (Introduction: https://youtu.be/2mHUWCoAU_s) ℃ It defines our lives, but what is time really? Have a look into its true nature.

Instruction for your HW: See the documentary https://youtu.be/n2qjkAHA2fk and write a 1-page report with the answers for the questions below:
1) Brief summary (0.5 page)
2) What was learned? (0.5 page)

• Week 11 (Nov. 15, 2022)

Lecture by Teaching Fellow, Homin Lim: Gyroscope 1: Two-Dimensional Kenetics

Chap. 19 Planar Kinetics of a Rigid Body: Impulse and Momentum: Note 8

- Homework 8 (Study for Quiz): Examples 18.4 / 18.5 / 18.6 /18.8

- Homework 9 (Due date: Nov. 29, 2021): Gravity and Me: The Force That Shapes Our Lives (https://www.imdb.com/title/tt6677418/)

Professor Jim Al-Khalili investigates the science of gravity, recreating ground-breaking scientific experiments including the moment when Galileo first discovered how to measure gravity.

Instruction for your HW: See the documentary https://vimeo.com/311529284 and write a 1-page report with the answers for the questions below:
1) Brief summary (0.5 page)
2) What was learned? (0.5 page)

• Week 12 (Nov. 22, 2022)

Lecture by Teaching Fellow, Homin Lim: Gyroscope 2: What are gyroscopic motions?

Chap. 16 Review

Chap. 20 Three-Dimensional Kinematics of a Rigid Body: Note 9 (Not covered)

• Week 13 (Nov. 29, 2022)

Lecture by Teaching Fellow, Homin Lim: Three-Dimensional Kinetics of a Rigid Body

Quiz 3: Directly taken from HWs 5, 6, and 8

Chap. 21 Three-Dimensional Kinetics of a Rigid Body: Note 10 (Not covered)

• Week 14 (Dec. 06, 2022)

Chap. 22 Vibrations: Note 11 (Not covered)

• Week 15

Review: Chap. 13 ~ 21

* Let's talk about career path after graduation
　

Tips for final exam: What to study

1) Read your text book from Chapter 16 to Chapter 19 with the lecture notes (from Note 5 to Note 8)

2) Review Chap. 16 Review & Chapters 17-19 Review

3) Solve the example problems below:

   Chap. 16: Examples 16.6, 16.9, 16.12
   Chap. 17: Examples 17.8, 17.12, 17.15
   Chap. 18: Examples 18.4, 18.6, 18.8
   Chap. 19: Examples 19.4, 19.6, 19.7

• Week 16

Final exam: Dec. 20