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Topic: Acoustic resonance

In the News (Thu 16 Feb 12)

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Pakistan

Family compact

	R. Parker --- Aeroacoustics
		The acoustic mode of each resonance was explored with a probe microphone which disclosed that the wavelength along the cascade at each frequency corresponded to an effective acoustic velocity less than the "velocity of sound" and the amplitudes decreased progressively with distance upstream and downstream of the cascade.
		Although still not fully understood, acoustic resonances which are believed to have caused blade failures have been observed in high speed, multistage compressors associated with aero-engine research and development but, for commercial reasons, the details have not been published.
		This generates acoustic energy at the vortex shedding frequency and the phase, relative to the excitation due to shedding, varies according to the distance downstream and the convection velocity.
	www.mae.cornell.edu /IJFD/1997_vol1/paper1/Parker.Flow.html (2811 words)

	Void detector for buried pipelines and conduits using acoustic resonance - US Patent 6386037 (Site not responding. Last check: 2007-10-16)
		The void is detected by monitoring an acoustic response from the conduit in response to acoustic excitation of the interior of the conduit.
		By comparing the acoustic frequency response to a baseline frequency response range, a void is detected as an acoustic frequency response outside a baseline frequency.
		Acoustic frequency sensor 18 is connected by a connector 20 to a microprocessor 22 and, in a preferred embodiment, produces an output signal by converting the mechanical vibration component of the acoustic frequency response into a corresponding electrical output signal.
	www.patentstorm.us /patents/6386037.html (2855 words)

	Acoustic resonance arc stabilization arrangement in a discharge lamp
		This application of acoustic resonance operation of a metal halide lamp is effective for substantially reducing color separation in the principal arc discharge region, however, this application also teaches that the lamp should be operated using this acoustic resonance frequency to achieve the stated advantage.
		Recognizing that such acoustic resonance frequency typically occurs on the kilohertz range which is suitable for operating an electroded discharge lamp, electrodeless discharge lamps on the other hand are typically operated at frequencies approaching or exceeding the megahertz region and therefore could not benefit from these teachings.
		The acoustic resonance condition is one wherein periodic oscillations in pressure occur in phase with the amplitude-modulating component of the input power thereby producing standing pressure waves.
	www.freepatentsonline.com /5306987.html (5222 words)

	CUPOL: Acoustic Resonance
		In this experiment, the resonance tube speaker is being driven by a sinusodial wave function at constant frequency.
		A moveable piston is inserted into one end of the resonance tube, thereby closing that end of the tube.
		When resonance was achieved, the position of the piston (i.e., the tube's length) was recorded.
	phoenix.phys.clemson.edu /labs/cupol/resonance/index.html (437 words)

	Scarre, Painting by Resonance
		Their results suggest that the acoustics of the caves played a significant part in determining where the paintings were located, and this observation leads directly to the supposition that music or chants were important elements in cave ceremonies around 20,000 years ago.
		The resonance of the caves is not in itself surprising.
		Reznikoff and Dauvois remark from their own experience on the impressive effect of cave resonance, which would have been all the more striking in the flickering half-light of the simple lamps or tapers used by the original artists.
	cogweb.ucla.edu /ep/Art/Scarre_89.html (491 words)

	Electronic ballast for a high intensity discharge lamp with automatic acoustic resonance avoidance
		A ballast for a high intensity discharge lamp which detects the onset of acoustic resonance instability by detecting an asymmetry in a signal which is otherwise symmetric in the absence of such instability.
		at the onset of acoustic resonance is asymmetric, and
		The onset of acoustic resonance instability is detected by measuring the symmetry of a characteristic signal which appears in the lamp voltage.
	www.freepatentsonline.com /5942860.html (3640 words)

	Emerson Process Management - CSI (Site not responding. Last check: 2007-10-16)
		Acoustic resonances occur when the sonic velocity of a gas matches the geometry of a piping system so that a standing wave is created.
		Removing the acoustic resonance is generally the preferred option, but unfortunately it is usually the most difficult and expensive as well.
		Very often the acoustic resonance would not be so detrimental except for the fact that it coincides with a mechanical natural frequency of the pipe or that the pipe is too flexible.
	www.compsys.com /drknow/aplpapr.nsf/06b6f5a4de2eae6285256a3f004d9758/1d43e57f55719b63852565a200632d69!OpenDocument (2940 words)

	Fissile-Material Detection Using Nuclear -Acoustic Resonance (Site not responding. Last check: 2007-10-16)
		A Nuclear Acoustic Resonance (NAR)-based detector would bypass this obstacle because the technology is not based on radiation signals.
		The process is simultaneously accompanied by strong interactions between the nuclear electric moments and the oscillating electric-field gradients, and the nuclear and electron magnetic dipoles and the oscillating magnetic fields.
		If the acoustic wave frequency is made to match the electron or the nuclear-resonant frequency, transitions among nuclear spin energy levels are induced which can in turn induce small but observable changes in the material’s bulk magnetization properties.
	rdc.llnl.gov /rdp/fissile.html (457 words)

	R. Parker --- Aeroacoustics (Site not responding. Last check: 2007-10-16)
		The results showed that the acoustic and mechanical systems cannot be considered separately but must be treated as parts of one system if the response either to mechanical excitation or to vortex shedding is to be predicted for cases where the resonance frequencies of the two systems are close to each other.
		The acoustic resonance can act as a vibration absorber when excitation is mechanical but, more importantly in relation to aeroacoustics, the relative motion of the vortex shedding body and the surrounding fluid controls the correlation of the vortex shedding and therefore the oscillatory energy input to the resonance.
		When the mechanical natural frequency is higher than the acoustic resonance frequency acoustic and mechanical velocities are in phase so the relative velocities are small, the vibration amplitudes are small and tend to vary cyclically.
	elecpress.monash.edu.au /ijfd/1997_vol1/paper1/Parker.Mechanical.html (287 words)

	Acoustic resonance analysis in manufacturing - processes and practical applications
		Acoustic resonance analysis for non-destructive testing of materials in mass-production, as offered by RTE Akustik + Prüftechnik GmbH is a proven technology, having been successfully implemented in various industries.
		Acoustic testing technology for non-destructive testing of materials is very old: for instance, merchants excite glass or porcelain goods by tapping, thus causing them to vibrate; the object's quality is assessed by the sound produced.
		Acoustic resonance analysis is a new, non-destructive testing process that allows rapid and cost-effective 100% testing of a wide spectrum of test objects.
	www.ndt.net /article/v05n01/hertlin/hertlin.htm (1630 words)

	ACOUSTIC ECOLOGY \| Ocean Issues: Balcomb report
		The killing is largely due to resonance phenomena in the whales cranial airspaces that are tearing apart delicate tissues around the brains and ears.
		The NATO report I referred to for resonance calculations was concerning the mass stranding of at least twelve Cuviers beaked whales in Greece on 12 May, 1996 coincident with a NATO acoustic trial employing both LFA (450-700 Hz) and mid-frequency sonar (2.8-3.3 kHz).
		The two largest of these remaining airspaces (pterygoid sacs or sinuses) are bilaterally adjacent to the earbones and the base of the brain (via the large foramen for the oversize VIII cranial nerve); and, their diminishing volume at depth is compensated for by retia mirabilia (a corpus cavernosum-like vascular network extending to the middle ear).
	www.acousticecology.org /oceanlfasbalcomb.html (1783 words)

	223 Physics Lab: Acoustic Resonance
		As shown in Figure 2, other resonant modes may be detected by slowly varying the length of the tube by moving the piston.
		By moving the piston, the resonant modes may be detected.
		The motion of a standing wave on a vibrating string in the previous experiment is very similar to the motion of sound waves in a resonance tube.
	phoenix.phys.clemson.edu /labs/224/resonance/index.html (1946 words)

	RESONANCE - Definition (Site not responding. Last check: 2007-10-16)
		An electric phenomenon corresponding to that of acoustic resonance, due to the existance of certain relations of the capacity, inductance, resistance, and frequency of an alternating circuit.
		(Acoustics) A prolongation or increase of any sound, either by reflection, as in a cavern or apartment the walls of which are not distant enough to return a distinct echo, or by the production of vibrations in other bodies, as a sounding-board, or the bodies of musical instruments.
		{Vocal resonance} (Med.), the sound transmitted to the ear when auscultation is made while the patient is speaking.
	www.hyperdictionary.com /dictionary/resonance (223 words)

	Acoustic resonance (Site not responding. Last check: 2007-10-16)
		We define the acoustic pressure as the difference between the air pressure and the equilibrium atmospheric pressure.
		To a first approximation the acoustic pressure is zero at the open ends of the tube.
		However, in reality, the acoustic pressure amplitude is generally much higher in the tube than outside, meaning that this condition gives a reasonable first approximation for the wavelengths of sound which lead to resonance.
	www.ph.ed.ac.uk /~jonathan/thesis/node9.html (280 words)

	美国专利申请公开说明书 20020148606 - Method and apparatus to vibrate a downhole component by use of acoustic ... (Site not responding. Last check: 2007-10-16)
		A method and apparatus of vibrating a tubing string in a wellbore comprises a rigid carrier or conveyance structure coupled to an acoustic resonance apparatus.
		A portion of the acoustic wave energy is reflected by a reflector in the acoustic resonance apparatus.
		The operating frequency of the pulser or other device is adjusted to achieve acoustic resonance in the fluid.
	cxp.paterra.com /uspregrant20020148606cn.html (127 words)

	IHS ESDU: Data Item 88028
		After outlining the nature of acoustic resonance, calculation methods are given for the acoustic frequency in both rectangular and cylindrical ducts.
		Procedures, based on a correlation of all the available acoustic data (all data on periodic wake shedding derived from measurements in the flow field were discarded because of their inapplicability), are given for the prediction of resonance.
		Possible damage caused by acoustic resonance is considered, and the means by which a design can be modified, before or after fabrication, are discussed.
	www.esdu.com /graphics/dataitem/88028.htm (152 words)

	AHCI Discussion Board
		Mechanically coupled resonance is a perfectly valid term as far as I can see; in fact, in pendulum resonator clocks the pendulums are coupled mechanically by the movements, which was the basis of Huygen's original observation of resonating pendulums.
		Resonance effects can occur where the frequency of the powered oscillator is slightly different from the frequency of the passive oscillator.
		Resonance can occur when the frequency of the powered oscillator is close to, but not necessarily an infinitely precise match with, the natural resonating frequency of the unpowered oscillator.
	www.network54.com /Forum/thread?forumid=125316&messageid=1109849794 (6935 words)

	Safeguards Seal's Program (Site not responding. Last check: 2007-10-16)
		We have begun to quantify the ability of acoustic resonance spectroscopy (ARS) to detect the removal and replacement of the lid of a simulated special nuclear materials drum.
		Conceptually, the acoustic spectrum of a container establishes a baseline fingerprint, which we refer to as an intrinsic seal, for the container.
		Simply removing and replacing the lid changes some of the resonant frequencies because it is impossible to exactly duplicate all of the stress patterns between the lid and container.
	www.sandia.gov /doe-oss/documents/acoustic-seals/acoustic.html (188 words)

	Evidences of Creation.com
		Resonance is defined as the harmony of frequencies (vibrations) of two different materials.
		There are other resonances in physics that are not simple at all and in the case of atomic nuclei, the resonances can be quite complex and sensitive.
		The resonance mentioned here occurs as follows: when two atom nuclei fuse, the new emerging nucleus both takes on the total of the massive energy of the two nuclei forming it and their kinetic energy.
	www.evidencesofcreation.com /creationuniverse04.htm (4210 words)

	Flow Science Acoustic Resonance in Piping Systems Projects
		Acoustic resonance in piping may lead to severe problems due to overstressing of components or significant losses of efficiency.
		Steady oscillatory flow can be induced by the pulsating flow introduced by compressors or may be set up by self-excitation related to pipeline geometry.
		The compressor flow is developed from design specifications and the complete pressure and flow response of the sysetm are predicted as a function of compressor speed.
	www.flowscience.com /acoustic_projects.php (161 words)

	The Tom Bearden Website
		While doing some background work looking into material acoustic resonance, I found some interesting references to "Cymatics." Apparently based on the results of Dr. Hans Jenny's 3D visualizations and mathematical analysis of Chladni figures, Cymatics involves an application of complex acoustic waveforms for the healing of certain ailments.
		The gist of this area of study is that disease represents a discord within the body's healthy resonance.
		According to practitioners of Cymatics, the body can be brought back into resonance and, hence, made healthy again, by dosing the body with the proper complex acoustic waveforms.
	www.cheniere.org /correspondence/092001.htm (256 words)

	AHCI Discussion Board
		The definition of resonance, as you mentioned, is generally an oscillator being externally driven by something that gives it a periodic 'push' at something close to one of its natural frequencies.
		The basic definitions I've seen of mechanical (vs. acoustic, nuclear, or chemical) resonance all pretty much say the same thing: that it consists of an oscillator being driven periodically by a force applied at something very near one of the natural frequencies of the oscillator.
		The advantage that I can see to a resonator- potentially- is that coupling the two balances doubles the effective mass and thereby increases the Q of the system overall.
	www.network54.com /Forum/message?forumid=125316&messageid=1109870246 (854 words)

	Paperback Writer: Resonance
		Acoustic resonance is defined as the intensification and prolongation of sound, especially of a musical tone, produced by sympathetic vibration.
		We writers may have our characters shout their brains out on the page, but our product is as soundless as if we shoved the reader into outer space.
		How they became blockbusters was by recognizing that first twang and building on what they did that resonated so strongly with the readers.
	pbackwriter.blogspot.com /2005/03/resonance.html (417 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The tablets were positioned at the vertex of the quartz tube in Fig.
		The swept-frequency acoustic excitation signal was applied to the input transducer at the top left arrow in Fig.1.
		Acoustic and/or near-IR light could be applied to the bottom of the tablet (in the direction of the bottom arrow) using an additional transmitting transducer or optics positioned there.
	kerouac.pharm.uky.edu /ASRG/Papers/nirars/NIRARSexp.html (405 words)

	Dr. Porter's PHY100 Homework: 21. Acoustic resonance (Site not responding. Last check: 2007-10-16)
		Resonance enables many musical instruments to couple their vibrations to the surrounding air.
		Here the springiness of the air in the belly of a bottle, coupled with the mass of the air in the neck of the same bottle determines the resonant frequency when air is blown across the lip of the bottle.
		Relate your observations to the phenomenon of resonance.
	www.physics.emich.edu /jporter/phy100/100v1hwk21.htm (168 words)

	Lyrics - Eternity (Part 3) (Acoustic) by ANATHEMA from album Resonance (2001) (Free Words of the song)
		You are viewing lyrics of Eternity (Part 3) (Acoustic) by ANATHEMA from the album Resonance (2001) at LyricsAndSongs.COM
		The Lyrics above are to Eternity (Part 3) (Acoustic) and are (Mostly correct, Yet...
		The Lyrics seem to be the lyrics to Eternity (Part 3) (Acoustic) But they are (Wrong)
	www.lyricsandsongs.com /song/13060.html (326 words)

	Abstract: ACOUSTIC RESONANCE ANALYSIS FOR SAFETY PARTS IN MASS PRODUCTION (Site not responding. Last check: 2007-10-16)
		Hertlin RTE Akustik + Prüftechnik; Pfinztal; Germany Sound testing by tapping a specimen is said to be one of the oldest NDT methods and still used in many applications, not only with chinaware or glasses.
		Acoustic resonance analysis (AR), developed by RTE, is a volume-oriented NDT method that allows fast 100 % testing of components and materials in metal and ceramic industry at low costs.
		A crack in a component causes certain resonances displaced to low frequencies whilst others remain the same.
	www.ndt.net /abstract/wcndt2004/209.htm (247 words)

	definition of resonance
		A prolongation or increase of any sound, either by reflection, as in a cavern or apartment the walls of which are not distant enough to return a distinct echo, or by the production of vibrations in other bodies, as a sounding-board, or the bodies of musical instruments.
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		Acoustic, Act, Alternating, Apartment, Are, As, Being, Capacity, Circuit, Distinct, Echo, Either, Enough, Frequency, In, Inductance, Or, Phenomenon, Quality, Reflection, Resistance, Resonance, Return, Sound, State, That, To, Which
	www.brainydictionary.com /words/re/resonance212593.html (261 words)

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