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Topic: Stiction

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	Brainboost - what is stiction (Site not responding. Last check: 2007-09-12)
		Stiction Stiction is the resistance to the start of motion, usually measured as the difference between the driving values required to overcome static friction upscale and down scale.
		Valve stiction is characterized by a period of time when the actuator attempts to move the valve but the valve does not move, followed by the valve jumping open and then moving smoothly.
		The stiction is regulated by a friction model whose parameters you specify.
	www.brainboost.com /search.asp?Q=what+is+stiction (302 words)

	How To Measure And Combat Valve Stiction On Line (Site not responding. Last check: 2007-09-12)
		On-line measurements of stiction are much more valuable than off-line measurements of stiction since when the valve is in service the line pressure and material in the line effect the stiction and mechanics of the valve.
		The stiction in the loop is the total amount of controller output change required to make the process variable move.
		Using this method, when the valve is within the stiction band, the integral action is missing from the controller, the controller output will not integrate, having the end effect of removing the stiction cycle from the loop.
	www.expertune.com /articles/isa2001/StictionMR.htm (973 words)

	anti-stiction coatings for MEMS
		In-use stiction may be caused by capillary forces, electrostatic attraction, and direct chemical bonding.
		To circumvent the stiction problem, many MEMS developers are forced to switch to bulk micro-machining, which is less capable and versatile than surface micromachining in terms of device function.
		One attractive approach to tackle the stiction problem is to provide low-energy surface coating in the form of an organic passivation layer on the inorganic surface [3, 4].
	memsurface.com /stiction.html (855 words)

	Stiction - The Hidden Menace
		Stiction is the resistance to the start of motion, usually measured as the difference between the driving values required to overcome static friction upscale and down scale.
		The word stiction is a combination of the words stick and friction, created to emphasize the difference between static and dynamic friction.
		Stiction can keep the stem from moving for small control input changes, and then the stem moves when there is enough force to free it.
	www.expertune.com /articles/RuelNov2000/stiction.html (1867 words)

	News Release - Diamond Micromachines
		The machines at the Department of Energy's national security facility are etched from a surface of amorphous diamond, the hardest material in the world after crystalline diamond in a manner compatible with current silicon chip and surface micromachine manufacturing techniques.
		Diamond interests researchers because of its superior wear-resistant qualities, resistance to stiction -- a combination of stickiness and friction -- and potential as a biocompatible material that could be used inside the human body for medical purposes without generating an allergic reaction.
		(Stiction is a tendency for an object resting on another to stick, rendering devices useless.) This is because, says Sullivan, while silicon is hydrophilic and therefore attracted to water that may be present in the atmosphere, diamond is not.
	www.sandia.gov /media/NewsRel/NR2000/diamond.htm (825 words)

	oe magazine - making MEMES reliable (Site not responding. Last check: 2007-09-12)
		One major failure mechanism is stiction, or the tendency of two silicon surfaces to stick to each other.
		Stiction is recognized as a major potential failure mechanism in surface micromachined MEMS.
		Stiction manifests itself as a yield issue to the supplier and a delivery issue to the customer.
	oemagazine.com /FromTheMagazine/sep02/tutorial.html (1526 words)

	About Bob Ashurst's Research...
		Stiction refers to unintentional adhesion of compliant micromechanical surfaces either to each other or their substrate.
		Engineering approaches to avoid release stiction (stiction that occurrs during the release step as a result of liquid capillary forces) include supercritical drying techniques, vapor release techniques, and freeze sublimation.
		However, these techniques are not capable of addressing the problem of in-use stiction (stiction that occurrs after the release, i.e., while the device is in operation) and other approaches must be investigated.
	www.eng.auburn.edu /~ashurwr/research.html (929 words)

	Laboratory Services Coating nano hardness tester adhesion wear scratch nano indenter (Site not responding. Last check: 2007-09-12)
		Stiction refers to the adhesion originating from the tribological contact of moving parts, which can result in immobilisation of the device.
		With this kind of microsystem, stiction can occur between the sides of the blade and their respective stopper surfaces.
		Stiction problems need to be solved in all types of devices, e.g., relay contacts, motion-stopping structures, valves, etc. Currently, the friction in bearings is the main requirement for tribology research in non-silicon micro actuators.
	www.microphotonics.com /NSTAB3.html (1149 words)

	Stiction - Wikipedia, the free encyclopedia
		Over $70,000 has been donated since the drive began on 19 August!
		"Stiction" is an informal contraction of the term "static friction" (perhaps also influenced by the verb "stick").
		In the context of hard disk drives, stiction refers to the tendency of read/write heads to stick to the platters, preventing the disk from spinning up and possibly causing physical damage to the media.
	en.wikipedia.org /wiki/Stiction (113 words)

	UCL Eprints - Modelling valve stiction (Site not responding. Last check: 2007-09-12)
		Stiction is the most commonly found valve problem in the process industry.
		In spite of many attempts to understand and model the stiction phenomena, there is a lack of a proper model, which can be understood and related directly to the practical situation as observed in real valves in the process industry.
		This study focuses on the understanding, from real-life data, of the mechanism that causes stiction and proposes a new data-driven model of stiction, which can be directly related to real valves.
	eprints.ucl.ac.uk /archive/00000435 (196 words)

	[ Thine Eyes ] : Interview - Stiction - Issue 10 (Site not responding. Last check: 2007-09-12)
		Our friend MC Death thought he heard Tanner and/or I say this as we were walking to McMin's one night.
		Stiction: Your previous release, From the Taunt, was self released.
		The music and rhythms in the Goth/Industrial camp are pretty prudish and, though often very emotional, predictably dependent on the same slow, Teutonic tone.
	www.aracnet.com /~jester/thineeyes/thine.eyes-5.interview.html (738 words)

	Fork Stiction Tuning
		Honda themselves recommends this in a pair of bulletins sent to dealers, because the foam, intended to keep the tube oiled and so help reduce stiction, instead gets caught in the seal, making the fork leak profusely.
		The word "stiction" is a contracted form of the words static and friction.
		But the stiction in your bike's fork can be reduced, and so easily, and with such remarkable results, it will surprise you.
	vmaxoutlaw.com /tech/fork_stiction_tuning.htm (1126 words)

	Powering Down Drives Is a Sticky Problem - Computerworld
		Some experts say stiction is caused by "grunge" accumulating on the drive head.
		An advisory published by the SANS Institute in Bethesda, Md., warned of grunge-based stiction among drives that have been running for months prior to being shut down for Y2K.
		But Paller said that, to his knowledge, no stiction problems occurred as a result of the year 2000 rollover.
	www.computerworld.com /printthis/2000/0,4814,40587,00.html (411 words)

	(WO 01/59504) STICTION RELEASE MECHANISM (Site not responding. Last check: 2007-09-12)
		Stiction is thereby overcome and the movable electrode is caused to be released from the contact surface.
		Alternatively, electric fields are applied at a resonant frequency of the movable electrode so that transverse resonant vibrations are excited in the portions of the movable electrode spaced apart from the contact surface.
		Stiction is thereby progressively overcome, and the movable electrode is caused to be released from the contact surface.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/59504.010816 (263 words)

	WombatNation » Stiction? (Site not responding. Last check: 2007-09-12)
		On the assumption that the problem with the drive was stiction (a.k.a., static friction), I tried to break it loose by rotating the drive with a quick wrist snap while it was running and making the clicking sounds.
		If the problem is stiction, it will require a pretty strong force to overcome it.
		Since I was already down to the last GB or two of free space on the second drive, I decided to go to Fry’s Saturday and I picked up a 200 GB Hitachi Deskstar ($195 - a $90 mail-in rebate).
	www.wombatnation.com /2004/03/stiction (463 words)

	CU MEMSweb: Dealing with MEMS stiction and other sticking problems (Site not responding. Last check: 2007-09-12)
		The most common definition is that stiction is the strong interfacial adhesion present between contacting crystalline microstructure surfaces.
		But the term has evolved to often include sticking problems such as contamination, friction driven adhesion, humidity driven capillary forces on oxide surface, processing errors that can result in structures call “streamers”, and many more.
		But, put simply, stiction is the unintentional adhesion of MEMS surfaces that, at one point or another, is the bane of almost all MEMS researchers.
	mems.colorado.edu /c1.gen.intro/c2.notes/stiction.shtml (883 words)

	Elasto-Plastic Friction Model: Contact Compliance and Stiction - Dupont, Armstrong, Hayward (ResearchIndex) (Site not responding. Last check: 2007-09-12)
		Abstract: The presliding displacement and stiction properties of friction models are investigated.
		It is found that existing single-state-variable friction models possess either stiction or presliding displacement.
		A class of general one-state models is derived that is stable, dissipative and exhibits both stiction and presliding displacement.
	citeseer.ist.psu.edu /dupont00elastoplastic.html (413 words)

	ChiefDelphi Forums - how do u figure out the torque req'd to move a robot?
		A certain amount of force is needed to break this bond, or overcome the "stiction." Stiction comes from many places in a mechanical system other than the wheels, too: ball bearings, grease in gearboxes, and many others.
		Stiction -- to my knowledge -- is not a real scientific term, but it is commonly used.
		It is a contraction of "stick-slip friction" and is characterized as the force required to overcome static adhesion/bonding forces that may occur when two objects are at rest with respect to one another.
	www.chiefdelphi.com /forums/showthread.php?t=31044 (2657 words)

	BMW motorcycle front fork stiction, BMW fork stiction, stiction
		The friction is great enough to cause the forks to stick until forces break it loose and then it jumps to another location and sticks again.
		The first test for stiction is very easy, but takes two persons.
		If the bike fails either stiction test, try a friends BMW, try everyone's BMW at the next club meeting.
	w6rec.com /duane/bmw/stiction.htm (768 words)

	Actuator cylinder with mechanism to reduce stiction (US5727445)
		A linear actuator cylinder reduces the stiction otherwise present during initiation of rod extension or retraction.
		The rotator mechanism typically includes a hydraulic or electric motor connected to the rod by, for example, a chain engaged with a pair of sprockets.
		Method for reducing seal stiction in a hydraulic cylinder
	www.delphion.com /details?pn=US05727445__ (306 words)

	Stiction in surface micromachining (Site not responding. Last check: 2007-09-12)
		In order to make a fail-safe device stiction during its operational life-time should be anticipated.
		Electrostatic forces and acceleration forces caused by shocks encountered by the device can be large enough to bring structures into contact with the substrate.
		This is possible by coating the device with weakly adhesive materials, by using bumps and side-wall spacers and by increasing the surface roughness at the interface.
	stacks.iop.org /0960-1317/6/385 (312 words)

	Typical_Olympus_Tests
		The breakaway stiction of the head is measured, along with the takeoff friction during acceleration, landing friction during deceleration, takeoff and landing velocities.
		Changes in the take-off time and stiction values are used as an indicator.
		This test includes measurements of both the friction and stiction characteristics and the magnetic signal characteristics at each start-stop cycle.
	www.cetr.com /Brochures/Typical_Olympus_Tests.htm (695 words)

	index (Site not responding. Last check: 2007-09-12)
		Apply pressure on the front brake, step down on the foot peg, (while you are standing beside the bike not on it.) If you rear end drops, but the front of the bike does not, or you can tell it is sticking.
		There is a good chance you have stiction.
		Don't listen to what we say about Forslyk, go see what all the chatter is on the web.
	www.miedosoracing.com (270 words)

	Measurement of Vertical Stiction (Site not responding. Last check: 2007-09-12)
		Measurement of Vertical Stiction (Adhesion) Forces in a Head-Disc Interface
		Figure 2 presents the data for a pull-off test of a so-called 30% head slider from a laser-textured carbon overcoated disk; the pull-off force was found to be 38 cN.
		The Micro-Tribometer allows to investigate effects of vertical speed, time of stationary contact (rest), head and suspension design, head and disc materials, lubricant, etc. on vertical stiction (adhesion).
	www.cetr.com /Brochures/Vertical_Stiction.htm (252 words)

	UCL Eprints - A data-driven model for valve stiction (Site not responding. Last check: 2007-09-12)
		Choudhury, M.A.A.S. and Thornhill, N.F. and Shah, S.L. A data-driven model for valve stiction.
		Striction is the most common problem in spring-diaphragm type valves, which are widely used in the process industry.
		stiction, stickband, deadband, hysteresis, backlash, control valve, static friction, viscous friction, nonlinearity, slip jump, control loop performance
	eprints.ucl.ac.uk /archive/00000486 (169 words)

	STICTION REPAIR FOR MEMS STRUCTURES AND DEVICES
		BACKGROUND: Stiction (adhesion of suspended structures and the underlying surface) is a considerable problem for batch fabricated MEMS devices.
		INNOVATION: A non-contact process has been developed to over come the MEMS stiction problem.
		Laser spallation is an innovative technology for de-adhering and measuring adhesion strength of film and multilayer film interfaces.
	www.research.ucla.edu /tech/ucla04-003.htm (332 words)

	A physical model to predict stiction in MEMS (Site not responding. Last check: 2007-09-12)
		A physical model to predict stiction in MEMS
		One of the most important reliability problems in micro-electromechanical systems (MEMSs) is stiction, the adhesion of contacting surfaces due to surface forces.
		After reviewing the known physical theory, and the measurement method commonly used to investigate stiction, we present a model that can be used to investigate the sensitivity of MEMS to stiction.
	stacks.iop.org /0960-1317/12/702 (306 words)

	cursor stiction problem in A2004 - AutoCAD
		Posted: Thu Oct 28, 2004 11:06 pm Post subject: cursor stiction problem in A2004
		Posted: Thu Oct 28, 2004 11:41 pm Post subject: Re: cursor stiction problem in A2004
		Posted: Fri Oct 29, 2004 4:50 pm Post subject: Re: cursor stiction problem in A2004
	www.cadforums.net /post-78.html (227 words)

	General Hardware Forum - Help, HDD Stiction Problem - Club CD Freaks
		General Hardware Forum - Help, HDD Stiction Problem - Club CD Freaks
		Discuss Help, HDD Stiction Problem, on CD Freaks, the worlds largest CD DVD Community.
		Hy IBM 20.3GB drive has suffered stiction (I think it means the heads are stuck in).
	club.cdfreaks.com /showthread.php?t=7714 (201 words)

	Best way to get rid of stiction in suspension forks (Site not responding. Last check: 2007-09-12)
		Best way to get rid of stiction in suspension forks
		Thanks in advance Polly Owner Polly's reCycle www.cyclescanada.com
		Re: Best way to get rid of stiction in suspension forks
	www.cyclingforums.com /t24130.html (544 words)

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