Engineering Acoustics

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Acoustics is the science that studies sound, in particular its production, transmission, and effects. Sound is defined as a small mechanical disturbance that may propagate at a speed characteristic of the medium, provided the medium is of great extent compared to a typical size of the disturbance. Sound may exist in gases, liquids or solids.

The applications of acoustics can be broken down into four main categories: Earth Sciences, Engineering, Life Sciences, and the Arts. Within Earth Sciences, acoustics is used in such applications as the development and refinement of underwater detection devices, the measurement of seismic waves and sound levels in the atmosphere. Engineering applications of acoustics include Noise Control, Electro-Acoustics, Sonic and Ultrasonic Engineering systems, non-destructive material testing, shock and vibrations of mechanical systems, and sound quality design of products. Life Sciences use Acoustics in hearing, speech production, bioacoustics, and psychoacoustics. In the Arts, Acoustics is involved in musical instruments, room acoustics, and communications. The following article describes some of the fundamental principles of Acoustics.

For more information about further applications of acoustics, please visit these Application Websites.

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Part 1: Lumped Acoustical Systems

1. Simple Oscillation
2. Forced Oscillations (Simple Spring-Mass System)
3. Mechanical Resistance
4. Characterizing Damped Mechanical Systems
5. Electro-Mechanical Analogies
6. Methods for checking Electro-Mechanical Analogies
7. Examples of Electro-Mechanical Analogies
8. Primary variables of interest
9. Electro-acoustic analogies
10. Transducers - Loudspeaker
11. Moving Resonators

Part 2: One-Dimensional Wave Motion

1. Transverse vibrations of strings
2. Time-Domain Solutions
3. Boundary Conditions and Forced Vibrations

Part 3: Applications

1. Room Acoustics and Concert Halls
2. Bass Reflex Enclosure Design
3. New Acoustic Filter For Ultrasonics Media
4. Noise in Hydraulic Systems
5. Basic Acoustics of the Marimba
6. How an Acoustic Guitar works
7. Specific application-automobile muffler
8. Bessel Functions and the Kettledrum
9. Filter Design and Implementation
10. Flow-induced oscillations of a Helmholtz resonator and applications
11. Acoustics in Violins
12. Moving Coil Loudspeaker
13. Attenuation of Sound Waves
14. Car Mufflers
15. Noise from cooling fans
16. Human Vocal Fold
17. Microphone Design and Operation
18. Piezoelectric Transducers
19. Microphone Technique
20. Sealed Box Subwoofer Design
21. Acoustic Guitars
22. Basic Room Acoustic Treatments
23. Boundary Conditions and Wave Properties
24. Rotor Stator Interactions

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