Showing result: 1 - 10 of 26
Acoustics
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Piezo-Acoustic Transducer
People that use piezoelectric transducers are interested in phased-array microphone, ultrasound equipment, ink-jet drop actuators, drug discovery, Sonar transducers, bio-imaging and acousto-bio-theraputics. Basically anyone who is trying to create sound in air or liquids turns to a version of this p...
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Acoustic Transmission Loss through Periodic Elastic Structures
In this model, two fluids are separated by a solid elastic structure. An acoustic pressure wave impacts the structure resulting in a reflected wave and a wave transmitted with a loss through the structure. This model investigates the transmission loss through the structure. The effects of incident a...
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Hollow Cylinder
Fluid acoustics coupled to structural objects, such as membranes or plates, represents an important application area in many engineering fields.
Some examples are:
• Loudspeakers
• Acoustic sensors
• Nondestructive impedance testing
• Medical ultrasound diagnostics
This model pro...
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Absorptive Muffler
The sound level from a car depends to a great extent of the quality of the muffler. Over the years, researchers in car industry have struggled to produce mufflers that are efficient in both acoustic and environmental perspective.
This model describes the pressure wave propagation in a muffler for...
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Acoustic-Structure Interaction
Liquid or gas acoustics coupled to structural objects such as membranes, plates or solids are important applications in many engineering fields. Some application examples include:
loudspeakers, acoustic sensors, nondestructive impedance testing, medical ultrasound diagnostics of the human body....
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Loudspeaker
This is a model of a loudspeaker of the dynamic cone driver type, common for low and medium frequencies. The instructions walk you through modeling its electromagnetic, structural, and acoustic properties. The output from the model includes the total electric impedance and the on-axis sound press...
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Ultrasound Scattering Off a Cylinder
This 2D model studies the scattering of ultrasound waves off a cylindrical obstacle with different acoustic properties than those of the surrounding medium.
The ultraweak variational formulation (UVWF) makes it possible to resolve the short wavelengths on a standard mesh.
The main advantage o...
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Jet Pipe
This example models the radiation of fan noise from the annular duct of a turbofan aeroengine. When the jet stream exits the duct, a vortex sheet appears along the extension of the duct wall due to the surrounding air moving at a lower speed. The near field on both sides of the vortex sheet is calcu...
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Vibrations of a Disk Backed by an Air-Filled Cylinder
The modes of vibration of a thin or thick circular disk are well known, and the corresponding eigenfrequencies can be calculated to arbitrary precision from a series solution. The same is true for the acoustic modes of an air-filled cylinder with perfectly rigid walls. A more interesting question is...
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Automotive Muffler
This is a model of the pressure wave propagation in a muffler for a combustion engine. The approach is general for analysis of damping of propagation of harmonic pressure waves.
The model shows how 3D acoustics can be modelled in fairly complex geometries. It also shows COMSOL Multiphysics' coup...
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