"Nonlinear acoustics (NLA) is a branch of physics and acoustics dealing with sound waves of sufficiently large amplitudes."
Studies the behavior of sound in highly nonlinear media, such as intense waves or shock waves.
Nonlinear wave propagation: The study of how sound waves behave when they interact with each other, creating new frequencies and harmonics.
Nonlinear phenomena in fluids: The behavior of fluids under intense acoustic waves, including bubble dynamics and cavitation.
Ultrasonics: The use of high-frequency sound waves in medical imaging and industrial applications, including non-destructive testing and cleaning.
Nonlinear scattering: The scattering of sound waves by complicated structures or materials, including random media and periodic structures.
Nonlinear acoustic spectroscopy: The use of acoustic waves to study the properties of materials, such as their elasticity or viscosity.
Nonlinear acoustic imaging: The use of acoustic waves to create images of internal structures, including biological tissues and geological features.
Nonlinear acoustic waves in solids: The propagation of sound waves through different types of materials, including metals, ceramics, and polymers.
Acoustic nonlinearity in temperature measurement: The use of acoustic waves to measure temperature changes in materials.
Nonlinear acoustics in underwater acoustics: The effects of nonlinear acoustic waves in underwater environments, including sonar applications and underwater communication.
Numerical methods in nonlinear acoustics: The use of mathematical models to simulate the behavior of acoustic waves in different materials and structures.
Nonlinear acoustics in biomechanics: The study of how acoustic waves interact with biological systems, including the human body.
Nonlinear acoustics in material testing: The use of acoustic waves to test material properties, including elasticity and softness.
Nonlinear acoustics in vibroacoustics: The interaction between nonlinear waves and structure vibrations.
Nonlinear ultrasound in engineering: The use of nonlinear ultrasound to detect and analyze cracks in structures.
Nonlinear acoustics in shock waves: The study of nonlinear waves created by shock waves, including blast waves.
Harmonic generation: This is the production of new frequencies and harmonic distortion in a sound wave due to nonlinear effects.
Wave mixing: This is when two or more waves interact and create a new waveform that is different from the original waves.
Shock waves: This is when a wavefront is compressed to produce a sudden, steep pulse of energy and is seen in explosives, blasting and some medical therapies like lithotripsy.
Acoustic streaming: This is the flow of particles induced by sound waves moving in a non-uniform manner in a fluid.
Nonlinear propagation: This is the general term for nonlinear effects on the propagation characteristics of waves, such as dispersion, absorption, and reflection.
Modulation of waves: This is the effect whereby a wave is modulated by another wave to create new frequencies and sidebands.
Self-interaction of waves: This is the interaction between different parts of a wave, leading to nonlinear effects such as self-focusing or self-defocusing.
Nonlinear Langevin-type systems: This occurs when a complex system is driven by a nonlinear force, generating a nonlinear response.
"NLA is a branch of physics and acoustics."
"Sound waves of sufficiently large amplitudes" fall under NLA.
"Full systems of governing equations of fluid dynamics (for sound waves in liquids and gases) and elasticity (for sound waves in solids) are required."
"These equations are generally nonlinear."
"Large amplitudes require using full systems of equations, and their traditional linearization is no longer possible."
"The solutions of these equations show that, due to the effects of nonlinearity, sound waves are being distorted as they travel."
"Sound waves are being distorted as they travel" due to the nonlinear effects.
"Nonlinear sound waves exhibit phenomena like wave steepening, wave breaking, and shock formation."
"The amplitude range for NLA depends on the specific system being studied."
"The behavior of nonlinear sound waves is influenced by the properties of the medium, such as fluid dynamics and elasticity."
"Large amplitudes require using full systems of equations, and their traditional linearization is no longer possible."
"NLA bridges the fields of physics and acoustics."
"Full systems of governing equations of fluid dynamics" are used to describe sound waves in liquids and gases.
"Full systems of governing equations of elasticity" are used for sound waves in solids.
"The solutions of these equations show that, due to the effects of nonlinearity, sound waves are being distorted as they travel."
"NLA also deals with sound waves in solids, using the equations of elasticity."
"Their traditional linearization is no longer possible" for sound waves of sufficiently large amplitudes.
"NLA provides a framework to study sound waves with large amplitudes and analyze their distortion effects."
"NLA focuses on the behavior and distortion of sound waves with sufficiently large amplitudes."