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Acoustics is the science of sound, particularly 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: Fundamentals of Acoustics
- Lumped Acoustic Systems
- Simple Oscillation
- Forced Oscillations (Simple Spring-Mass System)
- Mechanical Resistance
- Characterizing Damped Mechanical Systems
- Electro-Mechanical Analogies
- Solution Methods: Electro-Mechanical Analogies
- Examples of Electro-Mechanical Analogies
- Primary variables of interest
- Electro-acoustic analogies
- Transducers - Loudspeaker
- Moving Resonators
- One-Dimensional Wave Motion
- Three-Dimensional Wave Propagation
- Non-Linear Acoustics
Part 2: Applications
- Earth Sciences
- Atmospheric Phenomena
- Noise Control
- Noise in Hydraulic Systems
- Specific application-automobile muffler
- Flow-induced oscillations of a Helmholtz resonator and applications
- Car Mufflers
- Sound Absorbing Structures and Materials
- Noise from cooling fans
- International Space Station Acoustics Challenges
- Rotor Stator Interactions
- Noise control with self-tuning Helmholtz resonators
- Outdoor Sound Propagation
- Sonic or ultrasonic systems
- Noise Control
- Life Sciences