Showing result: 1 - 10 of 18
Acoustics Module
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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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The Acoustic Behavior of a Woofer in a Bass Reflex Enclosure
This example models the acoustic behavior of a woofer mounted in a bass reflex enclosure and placed in the corner of a room.
One of the most important design parameters for a loudspeaker driver is its sensitivity as a function of the frequency. To isolate the driver’s performance from that of t...
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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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Loudspeaker
A woofer is made from, a cone-shaped diaphragm with a voice coil wound around its apex. When an electric signal is applied to the coil, the coil and the cone start vibrating, creating sound with the same frequency as the signal.
This model computes the coil’s electrical impedance and then feed...
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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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Muffler with Perforates
Reflective mufflers are best suited for the low frequency range where only plane waves can propagate in the system, while dissipative mufflers with fibers are efficient in the mid-to-high frequency range. Dissipative mufflers based on flow losses, on the other hand, work also at low frequencies....
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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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Flow Duct
The modeling of aircraft-engine noise is a central problem in the field of computational aeroacoustics. The acoustic field in a model of an axially symmetric aero-engine duct, generated by a noise source at the boundary, is computed and visualized.
Results are presented for situations with as we...
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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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Cylindrical Subwoofer
In this model, the acoustic field inside and outside a down-firing subwoofer is computed.
This model is set up in 2D axisymmetry using the Pressure Acoustics application mode. The modeled physical domain is a hemisphere with a radius of 1 m. To minimize the effect of non-physical reflections at...
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