2025Year

First Semester

Advanced Vibroacoustic Control

Lecture

Advanced Vibroacoustic Control

Z1900035 Advanced Vibroacoustic Control

KAIZUKA Tsutomu

2.0Credits

Fri.6Period

Hachioji Remote

A) A high degree of specialized expertise　100%
B) The skills to use science and technology　0%
C) The ability to conduct research independently, knowledge pertaining to society and occupations, and sense of ethics required of engineers and researchers　0%
D) Creative skills in specific areas of specialization　0%

About this class:
Quietness is an important factor for our comfortable lives. Methods to achieve a quiet space can be categorized into two approaches: one is passive methods; and the other is active methods. Examples of the former approach are sound absorbing materials and vibro-isolating materials. In the latter approach, structural vibration and sound are measured and controlled by sensors and actuators. This class focuses on the latter approach. At first, theories of vibration and sound are lectured to understand the vibroacoustic behaviors. Then, control system designs to reduce vibration and sound are discussed.

Goals of this class: Understanding acoustic behaviors in free space and enclosure; understanding the relationship between structural vibration and sound; and understanding basics for controlling structural vibration and sound.

Basic knowledge on mechanical vibrations

Not used

1. One-dimensional wave equation
2. Plane wave: Sound speed and periodic sound
3. Plane wave: Solving Helmholtz equation (Infinite duct)
4. Plane wave: Solving Helmholtz equation (Finite duct)
5. Three-dimensional wave equation
6. Sound wave in a free space
7. Sound wave in an enclosure: Solving homogeneous Helmholtz equation
8. Sound wave in an enclosure: Solving inhomogeneous Helmholtz equation
9. Active noise control in a free space
10. Active noise control in an enclosure
11. Vibrating panel and its sound radiation in a free space
12. Active vibration control in a free space; Active structural acoustic control in a free space
13. Vibrating panel and its sound radiation in an enclosure; Active vibration control in an enclosure; Active structural acoustic control in an enclosure
14. Sound control techniques such as loudspeaker arrays
15. Review of the class

Grading evaluation is based on the reports.

Comments on the submitted reports will be presented in the 15th class.

Not specified.

F. Fahy and P. Gardonio, Sound and Structural Vibration: Radiation, Transmission, and Response, Academic Press

from 17:30 to 18:30, Tuesday: Due to Covid-19, please email me if you have any question. You can find my email address on the front page of the lecture materials.

I guess that most students know noise-cancelling headphones and earphones, i.e., active noise control. That is an example of what you will learn in this class. You may feel that mathematics to describe vibration and sound are a little complicated. However, I believe that you can do learning with a motivation, because vibration and noise are quite common problems in our daily lives.

Not applicable

Mechanical Engineering Program