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2020　Self-excited vibration

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Academic unit or major
Graduate major in Mechanical Engineering
Instructor(s)
Nakano Yutaka 
Class Format
Lecture    (ZOOM)
Media-enhanced courses
Day/Period(Room No.)
Wed1-2(Zoom)  
Group
-
Course number
MEC.D433
Credits
1
Academic year
2020
Offered quarter
3Q
Syllabus updated
2020/9/28
Lecture notes updated
-
Language used
English
Access Index

Course description and aims

【Course description】
This lecture deals with self-excited vibration phenomena. The lecture aim and the lecture plan are as follows.

【Aims】
The course aims to teach basic concepts and recent developments related to mechanical vibrations, structural dynamics, acoustics, and vibration control.

Student learning outcomes

By the end of this course, students will be able to:
(1) Understand the difference between self-excited vibration and forced vibration
(2) Understand the generation mechanism of self-excited vibration
(3) Explain the countermeasures against self-excited vibrations in consideration of their generation mechanism

Keywords

Self-excited vibration, Stability criterion, Unstable vibration, Negative damping, Friction induced vibration, Parametric excitation, Dry friction, Surging, Galloping, Time delay, Chatter, Coulomb friction, Flutter

Competencies that will be developed

✔ Specialist skills Intercultural skills Communication skills Critical thinking skills ✔ Practical and/or problem-solving skills

Class flow

The course is taught in lecture style. Handouts are given in class when necessary. Exercise problems will be assigned.

Course schedule/Required learning

  Course schedule Required learning
Class 1 Introduction Find some examples of self-excited vibration
Class 2 Stability analysis Understand the stability analysis
Class 3 Unstable vibration caused by negative damping Understand the unstable vibration caused by negative damping
Class 4 Unstable vibration caused by time delay Understand the unstable vibration caused by time delay
Class 5 Unstable vibration caused by asymmetries of stiffness matrix 1 Understand the friction vibration caused by the asymmetries of stiffness matrix
Class 6 Unstable vibration caused by asymmetries of stiffness matrix 2 Understand flutter
Class 7 Countermeasure against self-excited vibration and review of the whole course Understand the countermeasures against self-excited vibrations and review of the whole course

Out-of-Class Study Time (Preparation and Review)

To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.

Textbook(s)

None required.

Reference books, course materials, etc.

J. P. Den Hartog著, “Mechanical vibrations”, Dover Publications, ISBN-13: 978-0486647852
Singiresu S. Rao著, “Mechanical Vibrations”, Prentice Hall; 5th Revised, ISBN-13: 978-9810687120
The Japan Society of Mechanical Engineers, “Mechanical Engineering Handbook Fundamentals (α2) mechanical dynamics”, The Japan Society of Mechanical Engineers, ISBN-13: 978-4888981163

Assessment criteria and methods

Learning achievement is evaluated by exercise problems(100%).

Related courses

  • Mechanical vibrations (MEC.D201)
  • Vibration analysis (MEC.D311)
  • Rotor dynamics (MEC.D432)

Prerequisites (i.e., required knowledge, skills, courses, etc.)

Students must have successfully completed both Mechanical vibrations (MEC.D201) and Vibration Analysis (MEC.D311) or have equivalent knowledge.

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