
	Where results make sense

Topic: Mechanical Resonance

	PIRA 3A60.00 DRIVEN MECHANICAL RESONANCE (Site not responding. Last check: 2007-10-14)
		Enough "wine" is poured in to reach resonance and then enough "coffee" is poured in to overshoot resonance.
		A large scale resonance reed set is driven by a motor.
		A set of resonance reeds is mounted on a slightly unbalanced gyrowheel.
	www.physics.ncsu.edu /pira/3oandw/3A60.html (961 words)

	R. Parker --- Aeroacoustics (Site not responding. Last check: 2007-10-14)
		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.
	www.mae.cornell.edu /IJFD/1997_vol1/paper1/Parker.Mechanical.html (287 words)

	Servo Control
		Mechanical resonance forces designers to reduce servo gains, which reduce the ultimate performance of the servo system.
		Resonance is caused by compliant components in the drive train such as belts, couplings, gear boxes, and long shafts.
		Mechanical resonance can be corrected by improving the drive train, such as by strengthening compliant couplings, or by converting to direct drive technology, which removes the transmission altogether.
	www.motionvillage.com /training/handbook/drive/servocontrol/index.html (433 words)

	EEProductCenter.com :: Piezoelectric Technology: A Primer
		Mechanical compliance, which is the inverse of spring constant, is a function of the shape, mounting method, modulus, and type of load.
		The equation shown above states that the resonant frequency is equal to the speed of sound in the material divided by the acoustic length of the device.
		This is because the initial mechanical model assumed a single vibration node located at the center of the stack, which is only true when the transformer is driven at fundamental resonance.
	www.eeproductcenter.com /showArticle.jhtml?articleID=192200838 (2279 words)

	Physics 20 - Harmonics, Resonance and Interference
		An understanding of the causes and effects of mechanical resonance must be considered in the selection and design of materials for specific applications.
		In certain applications, particularly in civil and mechanical engineering, an understanding of mechanical resonance is essential to prevent the failure of materials.
		The resonance boxes can also be used to demonstrate that if one tuning fork is struck with the open ends of the resonance boxes facing the other, then the other tuning fork will begin to vibrate, since it has the same resonant frequency.
	www.sasked.gov.sk.ca /docs/physics/u5c42phy.html (1866 words)

	Piezoelectric transducers modeling
		To establish the very general concept of mechanical loading of piezoelectric converters (where mechanical load is presented in normalized form using the mechanical-load units comparable to internal resistance of the converter-driving electric circuit, or ultrasonic power supply).
		The same situation becomes more interesting when external mechanical excitation is originated from a dynamical, high frequency vibration source, which is in the same frequency range where sensor has its resonant frequencies, because this type of excitation usually has very low, or close to zero average-level of amplitudes (regarding its average force or average velocity).
		For instance, in series resonance zone we shall have maximal motional current and maximal motional force mutually in phase (presenting natural, series mechanical resonance), but maximal velocity and maximal displacement (in the same zone) would be realized on two other resonant frequencies (and all of them would be relatively close to each other).
	www.mpi-ultrasonics.com /transducers1.html (3982 words)

	Resonance (Site not responding. Last check: 2007-10-14)
		Resonance is a relatively large selective response of an object or a system that vibrates in step or phase, with an externally applied oscillatory force.
		An example of acoustical resonance is the vibration induced in a violin or piano string of a given pitch when a musical note of the same pitch is sung or played nearby.
		Mechanical resonance, such as that produced in bridges by wind or by marching soldiers, is known to have built up to proportions large enough to be destructive, as in the case of the destruction of the Tacoma Narrows Bridge in 1940.
	abyss.uoregon.edu /~js/glossary/resonance.html (156 words)

	StereoTimes -- Commentary: The Art and Science of Audio System Tuning: Part Two
		While mechanical resonance’s contribute to the sound of everything in audio, these contributions are not always detrimental.
		The sum total of the resonance’s of every constituent part of an audio system (which includes the listening room and everything in it, as well as all-electronic components and "accessories") is that system's resonance response.
		An even distribution of resonance’s establishes a level playing field for all of music's notes and overtones, allows the proper harmonic balance of the music to be preserved, and maximizes listening enjoyment.
	www.stereotimes.com /comm0400.shtml (1921 words)

	Resonance
		Resonance is an operating condition where an excitation frequency is near a natural frequency of the machine structure.
		In a machine that produces a broad spectrum of vibration energy, a resonance shows up in the vibration spectrum as a peak whose frequency is constant even as the machine speed is varied.
		The behavior of a resonant system when subjected to an external force is interesting and somewhat counter intuitive.
	www.dliengineering.com /vibman/resonance.htm (536 words)

	Resonance control using an SSt servo
		The effect of this mechanical resonance on settling time and disturbance rejection may be anywhere from insignificant to highly detrimental (long settling times and slow disturbance rejection).
		If, however, the servo is amplifying a resonance at a frequency above the bandwidth inherently required to execute the type motion you desire (or if you can compromise a bit), the SST servo drive’s all digital torque control and built-in tuning stimulus allows you to tailor the torque response bandwidth to control the resonance excitation.
		Resonance control along with Anti-Hunt is also used to limit annoying intermittent servo whine (caused by marginal high frequency instability) that may occur in an axis that otherwise operates well.
	www.worldservo.com /html/features/resonanc.htm (436 words)

	Mburns.com > Visualizing NonlinearResonance in Classicaland Quantum Mechanics: by Marshall Burns, Ph.D. in Computers ...
		In classical mechanics, the resonance occurs when the angular frequency, in action-angle space, of the unperturbed atom is close to the frequency of one or more of an infinite number of rotating cosine potentials representing the perturbation.
		This resonance is manifested in the evolution of the atom by a structure of resonance zones, regions of stability in the space of states of the atom.
		In classical mechanics this migration is by the evolution of the orbit, in quantum mechanics it is by the spreading of probability.
	www.ennex.com /~Marshall/physics/CompInPhys.asp (5864 words)

	Intuitor Physics of Resonance, ABC's of Resonance
		Resonance causes an object to move back and forth or up and down.
		The oscillation can be a mechanical vibration as is the case when the string of a guitar is strummed.
		Damping is a means of removing electrical or mechanical energy by converting it to heat.
	www.intuitor.com /resonance/abcRes.html (470 words)

	SoundStage! Max dB - Mechanical Resonances and Wire Directionality -- Part 1 (01/1999)
		This month’s discussion of mechanical resonances and wire directionality and how they affect the sound of your audio system (and home-theater system) is just the tip of the iceberg.
		We know that the string of a guitar or violin or other instrument resonates at different frequencies depending on how tight the tension on the string is and on where the musician places the fingers to create specific notes.
		An electrical wire has a natural resonant frequency and profile, a spectral fingerprint, which is controlled by the length, number, size, and geometric layout of the conductors; the materials used in making the wire; and how tightly all the elements are bundled together under the wire’s insulation.
	www.soundstage.com /maxdb/maxdb011999.htm (3607 words)

	StereoTimes -- Commentary: The Art and Science of Audio System Tuning
		As a result, energy from a mechanical resonance affects the flow of electrical energy through a conductor in such a way as to audibly emphasize the notes and overtones that coincide with the frequency of that resonance.
		All resonance’s affect the tonality of the sound of your audio system, whether they are electrical or mechanical...or a combination of the two.
		The significance of an audio component's resonance’s, to both consumer and designer alike, is a hidden aspect that confounds and confuses those seeking to build a truly enjoyable system.
	www.stereotimes.com /comm0200a.shtml (1773 words)

	Mechanical Resonance - Understanding Resonance
		A part passing through its "critical" or "critical speed" may also be said to be "resonant" or "resonating." However, the expression "critical speed" or "critical" is more accurately used when it is the rotor itself that is resonant.
		Therefore, it is very common today to mix the terms and use the words "critical speed" to mean "resonant frequency" or "resonance frequency," even when referring to a non-rotating part.
		Resonance magnifies the amplitude of vibrations in relatively undampened systems anywhere from 5 to 10 and sometimes 20 times over that of non-resonant vibrations.
	www.update-intl.com /VibrationBook2a.htm (548 words)

	ORMEC -- Coupling Servos to Mechanical Loads
		Mechanical design for servos adds an additional set of constraints to the design rules normally used for power transmission design.
		While many mechanical problems can be resolved using notch filters, they don't address the root cause of the problem and therefore are not a universal cure all.
		One thing to remember is that resonances are usually a greater problem when the system is stopped that when it is moving under load.
	www.ormec.com /csedocs/coupling.htm (2806 words)

	Seacor Piezo Ceramics - Definitions and Terminology
		The various modes of resonance are shown schematically in the Modes of Vibration section.
		The coupling coefficient (electromechanical coupling coefficient) is defined as the ratio of the mechanical energy accumulated in response to an electrical input or vice versa.
		Young’s modulus describes the mechanical stiffness properties and is expressed as the ratio fo stress to strain.
	www.seacorpiezo.com /def.html (384 words)

	International Union of Pure and Applied Chemistry (Site not responding. Last check: 2007-10-14)
		To find the value of the resonance energy (RE), the difference must be calculated between a quantity characterizing experimentally determined energy of a given molecule (such as heat of atomization or heat of formation) and the same characteristic obtained with the aid of an additive scheme, e.g.
		Dewar resonance energy, DRE, is the quantity which allows one to account for the effects of cyclic electron delocalization and thus serves as a measure of the aromatic stabilization (see aromaticity) of a cyclic molecular entity.
		In semiempirical quantum mechanical methods resonance integrals are adjustable parametric functions or parameters designed to achieve better agreement with experimental data.
	www.iupac.org /reports/1999/7110minkin/q-r.html (1193 words)

	Mass Acceleration and Mechanical Resonance - Forums powered by UBB.threads™
		The acceleration a or force F is applied at resonance or in phase with the velocity v of the electrons
		of energy amplitude amplification at mechanical resonance have to be re-interpreted.
		The advantage of the extended research allowed for the discovery of an automatic return mechanism which theoretically returns the traveler to their origin after two years of data collection.
	www.timetravelinstitute.com /ttiforum/showflat.php?Board=energies&Number=12981 (2914 words)

	Sensor Technology Limited
		The various modes of resonance are shown schematically in Figure 4.
		The coupling coefficient (sometimes referred to as the electromechanical coupling coefficient) is defined as the ratio of the mechanical energy accumulated in response to an electrical input or vice versa.
		Young's modulus describes the mechanical stiffness properties and is expressed as the ratio of stress to strain.
	www.sensortech.ca /site/index.cfm?DSP=Page&ID=64 (654 words)

	SoundStage! Network Ultra Audio -- Archived Article
		Each of these resonances interferes with the others, affects them, feeding back on them, so what you end up with, if you’re lucky, is something that represents the original signal yet, which isn’t true to the original.
		One is insulated with a plastic chosen for its minimal resonance; the other is insulated with a coating of baked enamel and then moisture proofed to prevent oxidation.
		The negative and positive pieces are arched in yet another proprietary configuration for further EM and resonance control, and then soldered (which is said to add still more resonance control), to their corresponding longer polarities upstream.
	www.ultraaudio.com /equipment/sahuaro_cables.htm (1905 words)

	Alberta PhysicsSource - eLab - Mechanical Resonance
		If energy is added at the right time, "in tune" with the natural frequency (mechanical resonance), the swing will go higher and higher.
		But if the energy is added "out of tune" with the natural frequency, it will result in the swing losing height to their swing.
		Compare the mechanical resonance in your spring system to the mechanical resonance occurring in a tall brick building as a result of the added energy from earthquake vibrations.
	www.scienceman.com /physics/pgs/2003_per_elab_14.html (1199 words)

	Mechanical Resonance - Resonating a Rotor's First Critical Speed that is Twice its Operating Speed
		Also, it could instead excite the resonant frequency of one of the non-rotating parts of the support structure or machine frame.
		Sometimes a roll can be subject to excessive vibration at 2 x rpm, due not to unequal flexibility but to misalignment of non-parallel rolls.
		Yet, if the 2 x rpm vibration it creates matches frequencies of some resonance in the support structure, then correction is in order.
	www.update-intl.com /VibrationBook2h.htm (478 words)

	Dr. Porter's PHY100 Homework: 20. Mechanical resonance (Site not responding. Last check: 2007-10-14)
		Mechanical resonance is important in the design of autos, airframes, buildings and bridges.
		Here is an excellent demonstration of this phenomenon which relies on the fact that, at least for small amplitudes, the period of a pendulum depends only on its length and not on its mass.
		That is, which of the other four pendulums moves with the greatest amplitude of swing.
	www.physics.emich.edu /jporter/phy100/100v1hwk20.htm (425 words)

	Interdisciplinary Laboratory Resonance Experiment (Site not responding. Last check: 2007-10-14)
		Use this data to construct a resonance curve.
		Please submit either an electronic version or a hardcopy of your resonance curve to Professor Haskell (Richard_Haskell@hmc.edu), Parsons 2367, no later than 7 PM on the Monday before your first laboratory period (October 25 or November 15).
		Describe a hypothesis that you would like to test regarding mechanical resonance of our model high-rise buildings.
	www2.hmc.edu /~karukstis/idlab/2004_2005/prelabresonance.htm (124 words)

	Video disc player with compensation for stylus holder mechanical resonance (US4516232)
		A video disc player includes a pick-up cartridge in which the stylus is supported by a stylus holder that is mechanically resonant at a frequency within an audio frequency range.
		A pick-up converter coupled to the stylus provides a broad audio video output signal that is undesirably modulated due to the stylus holder mechanical resonance.
		The audio signal is demodulated to baseband and linearly combined with the un-demodulated broadband signal to provide a resultant audio output signal in which audio frequency noise components, due to the mechanical resonance of the resulus holder, are attenuated.
	www.delphion.com /details?pn=US04516232__ (358 words)

	Mburns.com > Nonlinear Resonancein the Hydrogen Atom: by Marshall Burns, B.S., Ph.D. Ph.D. Dissertation atThe ...
		A separate paper, Visualizing Nonlinear Resonance in Classical and Quantum Mechanics, was later published in Computers in Physics to explain the computer-graphical techniques used to discover patterns in the huge volume of numerical data arising from the numerical simulations.
		Also included is the first demonstration of the existence of resonance zones in the quantum mechanical Hilbert space, and the overlap of the zones in a manner exactly analogous to the classical behavior.
		It is conjectured here that it takes the full series of primary resonances, which are all present implicitly in the energy in the physical phase space, to bring the resonances in the lower region up to their full width.
	www.ennex.com /~Marshall/physics/ThesisPrecis.asp (9249 words)

	Driven Mechanical Resonance with a Pasco Dynamics Cart (Site not responding. Last check: 2007-10-14)
		Mechanical resonance is easily demonstrated with a Pasco Dynamics Cart, Track, and Variable speed driver, as shown above.
		Cart mass can be used to vary the resonant frequency.
		If the springs are too loose, so that they are slack part of the time, the resonant frequency will be off the predicted value.
	www.physics.isu.edu /physdemos/waves/resonc1.html (123 words)

Try your search on: Qwika (all wikis)