"Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces."
Studies the generation and propagation of sound in relation to fluid motion, such as in aircraft or wind turbines.
Sound wave propagation: Study of how sound waves travel through different media and how they are affected by various parameters like density, temperature, and pressure.
Acoustic wave equations: Mathematical models used to describe the behavior of sound waves in different environments.
Fourier analysis: A mathematical technique used to separate complex signals into their component frequencies.
Boundary layer theory: The study of the layer of fluid adjacent to a solid boundary, where fluid velocity changes from zero at the boundary to the free-stream velocity.
Turbulence: The study of the chaotic, unsteady motion of fluids, which is a significant source of noise in aerodynamics.
Computational fluid dynamics (CFD): A tool used to simulate fluid flows and their interactions with structures.
Aeroelasticity: The study of interactions between aerodynamic and structural forces.
Wind tunnel testing: Experimental tool used to study the behavior of fluids and structures under controlled conditions.
Noise control techniques: Methods used to reduce or eliminate unwanted noise, including active and passive noise control.
Aeroacoustic measurement techniques: Techniques used to measure and analyze aerodynamic noise, including sound pressure level (SPL) and sound intensity.
Acoustic materials: Materials used for sound absorption, insulation or damping.
Helmholtz resonators: A simple device used for acoustic attenuation at specific frequencies.
Aeroacoustic simulations: Tools and methods used for predicting noise behavior in complex aerospace systems.
Propeller noise and its reduction.: Propeller noise and its reduction refer to the study and implementation of strategies to minimize the loud, unwanted sound generated by rotating propellers in order to improve overall aircraft noise levels and reduce potential negative effects on human health and the environment.
Jet noise and its reduction.: Jet noise is the study and mitigation of sound generated by jet engines during flight to minimize its environmental impact and enhance aviation safety and comfort.
Microphone theory and usage in noise measurement.: Microphone theory and usage in noise measurement refers to the understanding and application of microphones for capturing and analyzing sound waves in order to quantify and study noise levels in various environments.
Aerodynamic noise: Produced by turbulent airflow over solids, also known as airframe noise.
Jet noise: Generated by supersonic exhaust gases of jet engines, which can cause significant environmental and human health impacts.
Boundary layer noise: Produced by the turbulent boundary layer on surfaces, which is a factor in aircraft wing noise.
Cavity noise: Created by aerodynamically induced ventilation flows within cavities, such as landing gear bays.
Rotor noise: Generated by the interaction of helicopter rotors and the air, causing complex noise sources.
Shock wave noise: Arises when the shock waves created by supersonic airflow cause sound waves.
Wind turbine noise: Produced by the motion of turbine blades through the air and can be both mechanical and aeroacoustic.
Underwater acoustics: Deals with the propagation of soundwaves underwater and marine noise.
Sonic boom noise: The very loud sound caused by shock waves from aircraft flying at supersonic speed.
Flow-induced vibration: The coupling between flow and structural movement, such as that observed in a violin.
"Noise generation can also be associated with periodically varying flows. A notable example of this phenomenon is the Aeolian tones produced by wind blowing over fixed objects."
"Although no complete scientific theory of the generation of noise by aerodynamic flows has been established..."
"...most practical aeroacoustic analysis relies upon the so-called aeroacoustic analogy, proposed by Sir James Lighthill in the 1950s..."
"...proposed by Sir James Lighthill in the 1950s while at the University of Manchester."
"...whereby the governing equations of motion of the fluid are coerced into a form reminiscent of the wave equation of 'classical' (i.e. linear) acoustics in the left-hand side..."
"...reminiscent of the wave equation of 'classical' (i.e. linear) acoustics..."
"...with the remaining terms as sources in the right-hand side."
"...while at the University of Manchester."
"Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces."
"Noise generation can also be associated with periodically varying flows."
"A notable example of this phenomenon is the Aeolian tones produced by wind blowing over fixed objects."
"...most practical aeroacoustic analysis relies upon the so-called aeroacoustic analogy..."
"...proposed by Sir James Lighthill..."
"Although no complete scientific theory of the generation of noise by aerodynamic flows has been established..."
"...the governing equations of motion of the fluid are coerced into a form reminiscent of the wave equation of 'classical' (i.e. linear) acoustics..."
"...with the remaining terms as sources in the right-hand side."
"...proposed by Sir James Lighthill in the 1950s..."
"A notable example of this phenomenon is the Aeolian tones produced by wind blowing over fixed objects."
"...aerodynamic forces interacting with surfaces."