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Videos search results: "acoustic"
 
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Title          
Acoustic Levitation Chamber 
   
 
Abstract    
This is an acoustic levitation chamber I designed and built in 1987 as a micro-gravity experiment for NASA related subject matter. The 12 inch cubed plexiglas Helmholtz Resonant Cavity has 3 speakers attached to the cube by aluminium acoustic waveguides. By applying a continuous resonant(600Hertz) sound wave, and by adjusting the amplitude and phase relationship amongst the 3 speakers; I was able to control levitation and movement in all 3 (x,y,z) axis of the ambient space. This research was used to show the effects of micro-gravity conditions that exist in the space shuttle environment in orbit, but done here on Earth in a lab.
 
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Added By - matlabuser
Subject - Physics
Document Type - Experiments
Video Duration - 00:01:49
 
 
 

 

Title          
Twin cylinder thermo-acoustic Stirling Engine... 
   
 
Abstract    
A precision-built twin cylinder twin piston thermo-acoustic Stirling engine. These engines are sometimes called Lag engines and sometimes called Lamina flow engines.
 
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Added By - quantum
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:01:14
 
 
 

 

Title          
Cavitation driven weapon for Pistol Shrimp 
   
 
Abstract    
Acoustic weapon for Pistol Shrimp.The snapping shrimp competes with much larger animals, like the Sperm Whale and Beluga Whale, for the title of 'loudest animal in the sea'. The animal snaps a specialized claw shut to create a cavitation bubble that generates acoustic pressures of up to 80 kPa at a distance of 4 cm from the claw. The pressure is strong enough to kill small fish. It corresponds to a zero to peak pressure level of 218 decibels relative to one micropascal (dB re 1 μPa), equivalent to a zero to peak source level of 190 dB re 1 μPa at the standard reference distance of 1 m. Au and Banks measured peak to peak source levels between 185 and 190 dB re 1 μPa at 1 m, depending on the size of the claw. Similar values are reported by Ferguson and Cleary. The duration of the click is less than 1 millisecond.

The snap can also produce sonoluminescence from the collapsing cavitation bubble. As it collapses, the cavitation bubble reaches temperatures of over 5,000 K (4,700 °C). In comparison, the surface temperature of the sun is estimated to be around 5,800 K (5,500 °C). The light is of lower intensity than the light produced by typical sonoluminescence and is not visi...

 
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Added By - justin
Subject - Bioengineering
Document Type - Documentary
Video Duration - 00:01:33
 
 
 

 

Title          
Effect of gas on voice 
   
 
Abstract    
Effect of gas on voice
 
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Added By - reberg
Subject - Music
Document Type - Demonstration
Video Duration - 00:04:09
 
 
 

 

Title          
Diffraction 
   
 
Abstract    

Diffraction is normally taken to refer to various phenomena which occur when a wave encounters an obstacle. It is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings. Very similar effects are observed when there is an alteration in the properties of the medium in which the wave is travelling, for example a variation in refractive index for light waves or in acoustic impedance for sound waves and these can also be referred to as diffraction effects. Diffraction occurs with all waves, including sound waves, water waves, and electromagnetic waves such as visible light, x-rays and  

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Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:05:54
 
 
 

 

Title          
Sound Resonance 
   
 
Abstract    

An experiment showing the breaking of a glass beaker due to sound resonance is presented. In physics, resonance is the tendency of a system to oscillate at larger amplitude at some frequencies than at others. These are known as the system's resonant frequencies (or resonance frequencies). At these frequencies, even small periodic driving forces can produce large amplitude vibrations, because the system stores vibrational energy. When damping is small, the resonant frequency is approximately equal to the natural frequency of the system, which is the frequency of free vibrations. Resonance phenomena occur with all types of vibrations or waves: there is  

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Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:03:43
 
 
 

 

Title          
Cavitation in zero-g (Shockwave-Nuclei) 
   
 
Abstract    

Hydrodynamic cavitation inside a freefloating water drop produced in microgravity. (Credits: ESA, Danail Obreschkow, Philippe Kobel, Nicolas Dorsaz, Aurèle de Bosset, Mohamed Farhat).

http://en.wikipedia.org/wiki/Cavitation

Cavitation is a general term used to describe the behavior of voids or bubbles in a liquid. Cavitation is usually divided into two classes of behavior: inertial (or transient) cavitation and non-inertial cavitation. Inertial cavitation is the process where a void or bubble in a liquid rapidly collapses, producing a shock wave. Such cavitation often occurs in pumps, propellers, impellers, and in the vascular tissues of plants. Non-inertial cavitation is the process where a bubble in a fluid is forced to oscillate in size or shape due to some form of energy input, such as an acoustic field. Such cavitation is often employed in ultrasonic cleaning baths and can also be observed in pumps...

 
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Added By - matlabuser
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:38
 
 
 

 

Title          
Resonance Curves 
   
 
Abstract    

In physics, resonance is the tendency of a system to oscillate at larger amplitude at some frequencies than at others. These are known as the system's resonant frequencies (or resonance frequencies). At these frequencies, even small periodic driving forces can produce large amplitude vibrations, because the system stores vibrational energy. When damping is small, the resonant frequency is approximately equal to the natural frequency of the system, which is the frequency of free vibrations. Resonance phenomena occur with all types of vibrations or waves: there is mechanical resonance,

 
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Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:10:41
 
 
 

 

Title          
Lamina Flow Stirling Engine 
   
 
Abstract    

This amazingly simple engine runs at 700rpm heated only by a small candle.

Thermoacoustic hot air engines (Sonic heat pump and refrigeration or thermoacoustic heat pump and refrigeration) of which nearly all are thermoacoustic stirling engines is a technology that uses high-amplitude sound waves in a pressurized gas to pump heat from one place to another - or uses a heat temperature difference to induce sound, which can be converted to electricity with high efficiency, with a (piezoelectric) loudspeaker.

This type of heat pump or refrigerator has no

 
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Added By - quantum
Subject - Energy
Document Type - Demonstration
Video Duration - 00:01:00
 
 
 

 

Title          
MIT Researcher Joe Pompei's Audio Spotlight  
   
 
Abstract    

The Audio Spotlight uses a beam of ultrasound as a "virtual acoustic source", enabling unprecedented control of sound distribution. The graph to the right shows the real sound field of the Audio Spotlight versus the theoretical maximum directivity of any loudspeaker, panel, dome, or "shower" of the same size. As shown by this comparison, no loudspeaker in the world can approach the level of control provided by Audio Spotlight technology. For more on the theory of this device, go to http://www.holosonics.com/tech_directivity.html or download Joe Pompei's PhD thesis from DSpace at MIT Joe Pompei's PhD Thesis

 
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Added By - autocrawler
Subject - Physics
Document Type - Patents and Inventions
Video Duration - moderate
 
 
 

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