ME 525 Course Description

APPLIED ACOUSTICS: Mechanical Engineering 525

Lectures: MWF, 11:30-12:20 Spring Quarter 2009

Instructors: Professor Peter Dahl
Instructor Contact: dahl@apl.washington.edu, 206.543.2667

Textbook: Foundations of Physical Acoustics, David T. Blackstock, Wiley-Interscience, 2000. Additional references provided by instructor.

Prerequisites: Graduate standing, or permission from instructor. Familiarity with Matlab or equivalent application for use in homework-related data analysis and problems.

Homework: Homework will be assigned weekly in the class or communicated by email.

Grading Policy:
1/3 Homework
1/3 Mid term (Exam 1, take home)
1/3 Final (Exam 2, take home)

Course philosophy and goal: To introduce acoustics through its various applications and sub-fields, such as medical ultrasound, sonar and underwater sound, noise control and vibrations. The student obtains both a new perspective, and valuable working knowledge that can be applied to his or her particular field of research.

Topic

Sound wave phenomena in fluids

linear acoustics and the wave equation
plane-wave and spherical-wave solutions, acoustic scales

Acoustic Sources

simple sound sources, large & small ka limits
Green’s Theorem
more complex sound sources, the Rayleigh integral
sound radiation from structures

Reflection, Transmission and Impedance Tubes

Absorption in air and water media

Underwater waveguides

Snell’s law, acoustic rays and modes

Ambient noise in air and underwater environments, acoustic data analysis and spectral methods

Noise from different environments in air and underwater

Scattering of sound from a rough air-water interface as computed with the parabolic wave equation (PE) method. Sound source is on the left at depth 30 m. Sound penetration into and reflection from the seabed (depth 95 m) illustrates refraction and Snell’s law.

Noise pressure spectral density from an EA-6B jet flyover measured over water. The streaks are the result of interference between the direct path of sound from the jet, and a sound path reflected from the sea surface (the Lloyd mirror effect). The jet is directly over the microphone at time 25 s.

EDGE INFORMATION
Distance Learning Details:	For information on how to participate as an EDGE student, see the Course Access page.
Lectures:	Class meets on campus three times per week. EDGE students view these lectures via streaming video, CD-ROM or videotape. Students who are watching live may call into the classroom with questions, and office hours will be conducted through web conferencing.
Computer Requirements:	PC (Windows, Macintosh or Solaris) with Internet connectivity at 56 Kbps or higher (384 Kbps strongly recommended for streaming video); sound card; Microsoft Windows Media Player version 7.0 or greater; and Adobe Acrobat Reader version 4.0 or greater. Students choosing to receive CD-ROMs or videotapes must still have Internet access.
Credits:	3 credits. Audit option available.
Cost:	$1,860 ($620 per credit) plus textbooks, supplies and $35 registration fee, and $13 Technology Fee. Optional borrowing of CD-ROMs or videotapes is available for an additional fee.
Registration:	See the EDGE Program How to Apply page for information on taking a course as a non-matriculated student. Registration should be completed by March 17, 2008. Registration after this date will be accepted on a space-available basis. To earn credit toward a graduate degree, apply for Graduate Non-Matriculated (GNM) status by March 1, 2008.
For more information:	UW/EDGE Program University of Washington 4311 11th Avenue NE Seattle, WA 98105 Phone: 206.685.2242 Fax: 206.616.9704 edgeuw@u.washington.edu www.engr.washington.edu/edge/