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Topic: Bistable


In the News (Fri 22 Mar 19)

  
  Introduction to Bistable Mechanisms
Bistable mechanisms make up a class of mechanisms which have two stable equilibrium states within their range of motion.
Bistable mechanisms require no power input to remain stable at each equilibrium state.
Although compliant segments offer challenges such as limited motion and reduction in energy output, they may be effectively integrated into bistable mechanisms allowing motion and energy storage to occur within the same member.
research.et.byu.edu /llhwww/special/bistable.html   (262 words)

  
  Simon Guest: Bistable Structures   (Site not responding. Last check: 2007-10-26)
Bistable tubes are split tubes with essentially the same geometry as a carpenter's tape; however, unlike a carpenter's tape, which is only stable when extended (b), these structures have a second stable state, they are also stable when coiled (a).
There are two ways to make a tube bistable; either by altering the bending stiffnesses of the structure so that it is no longer isotropic, for instance by using a fibre-reinforced composite, or by setting up an initial prestress in the structure.
In order to make a tube bistable without prestress, it is necessary to: (i) increase the torsional stiffness, and (ii) increase the coupling between bending in the longitudinal and transverse directions.
www2.eng.cam.ac.uk /~sdg/bistable   (383 words)

  
 Nanoparticle-polymer bistable devices invention
The doped nanofibers impart bistable electrical characteristics to the polymer body, such that the polymer body is reversibly convertible between a low resistance state and a high resistance state by application of an electrical voltage.
The combination of the nanofibers and nanoparticles provides for a bistable polymer body that is converted between the low resistance state and the high resistance state by application of an electrical voltage to the bistable polymer body.
In addition to the bistable devices, such memory devices include a memory input element for applying a voltage to the bistable polymer body to convert the bistable polymer body between the low electrical resistance state and the high electrical resistance state.
www.freshpatents.com /Nanoparticle-polymer-bistable-devices-dt20051208ptan20050270442.php   (1315 words)

  
 Control springback, create shape memory in thin materials.
Effects of overlapping: Bistable domes with overlapping perimeters are structurally connected and the band of material through their connected perimeters is higher (or lower) in profile toward the centers of the domes.
The bistable domes are forced to adjust to their flattened state patterns during formation but will have a tendency or memory to assume their preferred bistable patterns when released to do so.
Bistable dome pump- a flexible pump that pumps when bent.
home.earthlink.net /~barkingpo/bistablearray.html   (1174 words)

  
 Flex-actuated bistable dome pump - Patent 6132187
The metal strip carries at least one bistable shallow metal dome that is formed in the metal strip, and preferably the metal strip carries a linear, elongated row of a number of the metal domes.
When bistable dome 16 moves to its stable concave state 20, interior volume 17 is reduced, pump pressure is produced, and flowable material within interior volume 17 flows out of flow out check valve 14, into conduit 24, and thereby into a flow in source (not shown).
When bistable dome 16 moves to its stable convex state 21, interior volume 17 is increased, pump suction is produced, and flowable material held by a flow in source (not shown) flows into conduit 25, into flow in check valve 13, and into interior volume 17.
www.freepatentsonline.com /6132187.html   (4791 words)

  
 Controller for Bistable Brakes
To switch a bistable brake from "on" to "off" or vice versa, all that is needed is a pulse of direct current with a duration of the order of 100 milliseconds.
Bistable brakes were chosen for these joints because 34 ordinary electromagnetic brakes would consume too much energy.
In another application, a bistable brake is part of a droplet-deployment servo system in a droplet-combustion flight experiment; the use of the bistable brake in this system minimizes heat gain by fuel droplets.
www.nasatech.com /Briefs/Apr00/LEW16818.html   (530 words)

  
 Data-storage devices and bistable circuits therefor - Patent 4300211
A data-storage device embodying such bistable circuits is also disclosed; a rotatable disc carries a plurality of such circuits at regular spacings adjacent its periphery, and several setting devices at different positions are each operable to illuminate one of the circuits passing the setting device to switch that circuit to the ON state.
A data-storage device as claimed in claim 2 further comprising electrical circuit means for supplying electrical current to said plurality of bistable circuits and signal means for detecting a predetermined current level in said electrical circuit means corresponding to the combined current drawn by a predetermined minimum number of said bistable circuits.
A data-storage device as claimed in claim 11 further comprising electrical circuit means for supplying electrical current to said plurality of bistable circuits and signal means for detecting a predetermined current level in said electrical circuit means corresponding to the combined current drawn by a predetermined minimum number of said bistable circuits.
www.freepatentsonline.com /4300211.html   (2882 words)

  
 MEMS Bistable Mechanisms at BYU
As the name suggests, bistable mechanisms are mechanisms that are stable in two positions.
These mechanisms gain their bistable behavior from the energy stored in the flexible segments which deflect to allow mechanism motion.
Currently, studies are being done to investigate the usefulness of bistable mechanisms on the micro-level as valves and switches.
research.et.byu.edu /llhwww/current_research/bistable_mech/bistable_page.html   (174 words)

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