Numerical Prediction of Minor Losses in High Amplitude Acoustic Resonators

2002 ◽  
Author(s):  
Said Boluriaan ◽  
Philip Morris
Keyword(s):  
High Amplitude ◽  
Numerical Prediction ◽  
Acoustic Resonators ◽  
Minor Losses

Acoustic energy harvesting from vortex-induced tonal sound in a baffled pipe

2011 ◽  
Vol 225 (8) ◽  
pp. 1847-1850 ◽  
Author(s):  
R Hernandez ◽  
S Jung ◽  
K I Matveev
Keyword(s):  
Acoustic Pressure ◽  
Electrical Energy ◽  
High Amplitude ◽  
Acoustic Mode ◽  
Acoustic Energy ◽  
Electric Load ◽  
Mean Flow ◽  
Acoustic Resonators ◽  
Acoustic Energy Harvesting ◽  
Mean Flow Velocity

Energy of high-amplitude sound that often appears in acoustic resonators with mean flow can be harnessed and converted into electricity for powering sensors and other devices. In this study, tests were conducted in a simple setup consisting of a pipe with a pair of baffles and a piezoelement. Tonal sound, corresponding to the second acoustic mode of the resonator, was excited due to vortex shedding/impinging on baffles in the presence of mean flow. Generated sound energy was partially converted into electrical energy by a piezoelement. About 0.55 mW of electric power was produced on a resistive electric load at acoustic pressure amplitudes in the pipe about 170 Pa and mean flow velocity 2.6 m/s.

Introduction to Acoustic Compressors

2000 ◽  
Author(s):  
Bart Lipkens ◽  
Fred Lalande ◽  
David Perkins
Keyword(s):  
Fluid Dynamic ◽  
New Technology ◽  
Acoustic Resonance ◽  
High Amplitude ◽  
Transfer Energy ◽  
Acoustic Resonators ◽  
Variable Reluctance ◽  
Low Profile ◽  
Variable Capacity ◽  
Spot Cooling

Abstract The emergence of acoustic compressors has been made possible by the development of a new technology called Resonant MacroSonic Synthesis (RMS). RMS allows the creation of macrosonic standing waves in acoustic resonators. The shape of the resonator controls the nonlinear fluid dynamic processes by which energy is transferred to higher harmonics. Through this process resonators have been designed that allow high-amplitude shock-free waveforms. A variable reluctance driver is used to transfer energy into the resonator. The entire resonator is oscillated along its axis at the fundamental acoustic resonance frequency. This process is called entire resonator drive. The valve technology used in these compressors is similar to that of conventional reciprocating compressors. Acoustic compressors are inherently variable capacity and oil-free. Other unique characteristics are flexible orientation and low profile packaging option. Development focuses on vapor-compression applications. The application discussed here is spot-cooling.

Optimal shaping of acoustic resonators for the generation of high-amplitude standing waves

2014 ◽  
Vol 136 (3) ◽  
pp. 1003-1012 ◽  
Author(s):  
Milan Červenka ◽  
Martin Šoltés ◽  
Michal Bednařík
Keyword(s):  
Standing Waves ◽  
High Amplitude ◽  
Acoustic Resonators

Cue utilization in a numerical prediction task

1974 ◽  
Author(s):  
Sarah Lichtenstein ◽  
Timothy C. Earle ◽  
Paul Slovic
Keyword(s):  
Numerical Prediction ◽  
Cue Utilization ◽  
Prediction Task
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