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Topic: Vibrating structure gyroscope

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Gyroscope

Ring laser gyroscope

Inertial navigation system

Strapdown

Halteres

Inertial guidance system

Accelerometer

Gimbal

Gyrocompass

Guidance system

Sagnac interferometer

Optical fibre

Interference

Gimbal lock

Laser

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	Wikinfo \| Gyroscope (Site not responding. Last check: 2007-10-09)
		Gyroscopes can be used to construct gyrocompasses which replace magnetic compasses (in aircraft and spacecraft), to assist in stability (bicycle, Hubble space telescope), as a repository for angular momentum (momentum wheels) and as a means to conserve and deliver energy (flywheel energy storage) in some machines.
		where the vectors τ and L are the torque on the gyroscope and its angular momentum, the scalar I is its moment of inertia, the vector ω is its angular velocity, and the vector α is its angular acceleration.
		The torque on the gyroscope is supplied by a couple of forces: gravity acting downwards on the device's centre of mass, and an equal force acting upwards to support one end of the device.
	www.internet-encyclopedia.org /wiki.php?title=Gyroscope (517 words)

	Gyroscope
		The gyroscope effect was discovered in 1817 by Johann Bohnenberger and invented and named in 1852 by Léon Foucault for an experiment involving the rotation of the Earth.
		Gyroscopes can be used to construct gyrocompasses which complement or replace magnetic compasses (in ships, Aircraft and Spacecraft, vehicles in general), to assist in stability (Bicycle, Hubble Space Telescope, ships, vehicles in general) or be used as part of an Inertial guidance system.
		where the vectors τ and L are, respectively, the Torque on the gyroscope and its angular momentum, the scalar I is its moment of inertia, the vector ω is its angular velocity, and the vector α is its angular acceleration.
	www.ufaqs.com /wiki/en/gy/Gyroscope.htm (750 words)

	Gyroscope
		Some gyroscopes have mechanical equivalents substituted for one or more of the elements, e.g., the spinning rotor may be suspended in a fluid, instead of being pivotally mounted in gimbals.
		A control moment gyroscope (CMG) is an example of a fixed-output-gimbal device that is used on spacecraft to hold or maintain a desired attitude angle or pointing direction using the gyroscopic resistance force.
		In the first several decades of the 20th century, other inventors attempted (unsuccessfully) to use gyroscopes as the basis for early fl box navigational systems by creating a stable platform from which accurate acceleration measurements could be performed (in order to bypass the need for star sightings to calculate position).
	articles.gourt.com /en/gyroscope (1452 words)

	Method of calibrating bias drift with temperature for a vibrating structure gyroscope - Patent 7120548
		Vibrating structure gyroscopes are known in many forms such as tuning fork, cylinder or planar ring structures.
		In order to carry out this calibration process the vibrating structure gyroscope is placed inside a temperature chamber and over a period of time cycled over the operational temperature envelope, data-logging both the bias (while the gyro is stationary) and the output of the temperature sensor.
		The primary drive voltage P is a measure of the drive required to maintain the primary oscillation of vibrating structure 1 at a fixed amplitude.
	www.freepatentsonline.com /7120548.html (2848 words)

	VSG Rate Gyroscope Principles of Operation - Watson Industries
		Vibrating Structure Gyroscopes are solid state devices which provide an output voltage proportional to the rate of turn applied to the sensitive axis.
		To use the coriolis effect to detect angular rotation, a solid structure is forced to vibrate normally at its resonant frequency.
		When the structure is rotated, the coriolis forces cause the vibration motion of the structure to be coupled to another vibration mode or plane of the structure.
	www.watson-gyro.com /products/rate_gyro_principle.html (296 words)

	Method for matching vibration mode frequencies on a vibrating structure - Patent 5739410
		Vibration mode frequencies of a vibrating structure gyroscope sensing element are matched by removing and/or adding a desired variable amount of material from or to the sensing element (1) at at least one point (4) on or in the vicinity of the neutral axis (5).
		A vibrating structure sensing element for a vibrating structure gyroscope having material added thereto and/or removed therefrom according to the method of claim 1 to match vibration mode frequencies of the element.
		1A is a schematic diagram of a conventional vibrating structure sensing element driven resonantly on the cos 2.theta.
	www.freepatentsonline.com /5739410.html (1466 words)

	Digital control system for a vibrating structure gyroscope - Patent 6276204
		This invention relates to a digital control system for a vibrating structure gyroscope of the kind having a vibrating structure, primary and secondary drive means for putting and maintaining the vibrating structure in vibratory resonance and primary and secondary pick-off means for detecting vibration of the vibrating structure.
		Conveniently the digital processing unit is operable to adjust the frequency of the variable frequency oscillator to a multiple of the resonant frequency of the vibrating structure based upon the output signals received by the digital processing unit from the primary pick off means.
		Similarly the drive waveforms to excite the vibrating structure primary drive means 4 and secondary drive means 7 are generated by the digital to analogue converters 20 which are synchronised to the output from the variable frequency oscillator 23.
	www.freepatentsonline.com /6276204.html (3499 words)

	Qwika - similar:Sagnac-Interferometer
		For Gyroscope the Australian musical group see Gyroscope (band) A gyroscope is a device for measuring or maintaining orientation, based on the principle of conservation of angular momentum.
		In gyroscopic devices controlled by Euler mechanics or Euler angles, gimbal lock is caused by the alignment of two of the three gimbals together so that one of the rotation references (pitch/yaw/roll, often yaw) is cancelled.
		In science, a vibrating structure gyroscope is a type of gyroscope that functions much like the halteres of insects.
	www.qwika.com /rels/Sagnac-Interferometer (1244 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-09)
		In physics this phenomenon is also known as gyroscopic inertia or rigidity in space.
		Examples of some free-output-gimbal devices would be the attitude reference gyroscopes used to sense or measure the pitch and roll and yaw attitude angles in a spacecraft or airplane.
		Instead of falling, as might be expected, the gyroscope appears to defy gravity by remaining with its axis horizontal, when the other end of the axis is left unsupported and the free end of the axis slowly describes a circle in a horizontal plane, the resulting precession turning.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Gyroscope (1390 words)

	Gyroscope Summary
		Gyroscopes are mounted disks that spin so that their axes can turn freely and maintain a constant orientation in space.
		Gyroscopes are the heart of the space shuttle's Inertial Measurement Units (IMUs).
		Gyroscopes have become essential in space, allowing the craft to navigate from its actual position in space rather than relying on external information from radio signals or celestial bodies.
	www.bookrags.com /Gyroscope (2948 words)

	BAESYSTEMS.com (Site not responding. Last check: 2007-10-09)
		Gyroscope designers have responded by developing solid-state devices which use the electronic properties of solids such as a semiconductor.
		At less than one centimetre in diameter, the tiny sensor at the heart of the VSG can be integrated with control electronics to provide the high level of accuracy required at a cost which is significantly lower than other available available gyroscopes.
		Combine this with the fact that it's light, uses less power and is easier to manufacture in high volumes, and the Silicon VSG sets a new standard for future gyroscope design.
	www.baesystems.com /engineering/examples/vsg.htm (320 words)

	Draper Laboratory - Patents 1997 (Site not responding. Last check: 2007-10-09)
		Each vibratable structure is energizable to vibrate laterally, within a first plane, along an axis normal to the rotation sensitive axis.
		The lateral or inplane vibration of the first and second vibratable structures effects simultaneous vertical or rotational movement of at least a portion of the suspended structure upon the occurrence of angular rotation of the gyroscope about the rotation sensitive axis.
		Vertical or rotational movement of the suspended structure is sensed, and a voltage proportional to the movement is generated, for providing an indication of angular rate of rotation by the gyroscope.
	www.draper.com /publications/patents/patents97.htm (2275 words)

	Reference.com/Encyclopedia/Vibrating structure gyroscope
		In the engineering literature, this type of device is also known as a Coriolis vibratory gyro because as the plane of oscillation is rotated, the response detected by the transducer results from the coriolis term in its equations of motion ("Coriolis force").
		The oscillation can also be induced and controlled in the vibrating structure gyroscope for the positionning of spacecrafts such as Cassini-Huygens Theses small Hemispherical Resonator Gyroscopes made of quartz operate in vacuum.
		Vibrating structure gyroscopes are commonly used in radio-controlled helicopters to help control the helicopter's tail rotor or in radio-controlled airplanes to help keep the tail steady during take-off or hand (especially with discus launched gliders) launch.
	www.reference.com /browse/wiki/Vibrating_structure_gyroscope (588 words)

	Inertial guidance system Summary
		The strap-down inertial system has three gyroscopes and three accelerometers mounted directly to the vehicle, and their outputs are read every one hundredth of a second.
		New gyroscopes have been developed that are more precise and less prone to error, including the laser gyroscope and the electrostatic gyroscope.
		Less expensive navigation systems intended for use in automobiles, may use a Vibrating structure gyroscope to detect changes in heading, and the odometer pickup to measure distance covered along the vehicle's track.
	www.bookrags.com /Inertial_guidance_system (2610 words)

	Measuring and testing patents new
		Agent: Vinson & Elkins L.L.P. Method for monitoring a rotating rate sensor: The invention relates to a method for monitoring a rotation rate sensor comprising a vibration gyroscope that represents a band-pass filter and that is part of at least one control circuit.
		The vibration is attributable to a composite mechanical operation of the first and second subassemblies of the equipment.
		The substrate is structured to allow bacteria to colonize it at at least the rate of accumulation expected on the conduit walls or at an accelerated rate in order...
	www.freshpatents.com /Measuring-and-testing-dtnewntc073.php (7402 words)

	Platform Solutions, Queen's Award (Site not responding. Last check: 2007-10-09)
		The gyroscope is also used to provide the essential stabilisation in the innovative self-balancing two wheeled Segway™ Human Transporter.
		The silicon gyroscope technology is based on a vibrating ring resonator only 6 millimetres across, whose pattern of vibration changes according to the rate of turn to which it is subjected.
		The silicon gyroscope - unlike any other gyroscope technology in the world - is 'gun-hard' which means it has successfully been trialled and shown to withstand the intense shockforces exerted during launch from artillery guns.
	www.eis.na.baesystems.com /platform_solutions/products_and_services/inertial_products/gyro/queens_award.htm (911 words)

	vibrating - Hutchinson encyclopedia article about vibrating (Site not responding. Last check: 2007-10-09)
		One complete to-and-fro movement of a vibrating object or system.
		For any particular vibration, the time for one oscillation is called its period and the number of oscillations in one second is called its frequency.
		The maximum displacement of the vibrating object from its rest position is called the amplitude of the oscillation.
	encyclopedia.farlex.com /vibrating (127 words)

	BBC NEWS \| England \| Devon \| Honour for gyroscope firm
		BAE Systems won a Queen's Award for Enterprise for developing a gyroscope that is used in guns, cars and the unique Segway two-wheeled scooter.
		The Silicon Vibrating Structure Gyroscope is based on a ring 6mm wide which vibrates as it is turned around.
		Commercially, the gyroscope is also used in the self-balancing human transport device known as the Segway, another Plymouth invention.
	news.bbc.co.uk /1/hi/england/devon/2962251.stm (415 words)

	Vibrating structure comprising two coupled oscillators, in particular for a gyro - US Patent 6807858 (Site not responding. Last check: 2007-10-09)
		Vibrating structure comprising two coupled oscillators, in particular for a gyro - US Patent 6807858
		Vibrating structure comprising two coupled oscillators, in particular for a gyro
		A vibrating structure including at least two oscillators vibrating in a direction of oscillation included in a plane, a rigid support of the oscillators, and an oscillator coupling device to couple their vibratory movements.
	www.patentstorm.us /patents/6807858.html (168 words)

	Fibre optic gyroscope - Wikipedia, the free encyclopedia
		A fibre optic gyroscope (FOG) is a device that uses the interference of light to detect mechanical rotation.
		Unlike the classic spinning-mass gyroscope, the FOG has virtually no moving parts and no inertial resistance to movement.
		The FOG typically shows a higher resolution than a ring laser gyroscope but also a higher drift and worse scale factor performance.
	en.wikipedia.org /wiki/Fibre_optic_gyroscope (227 words)

	Vibrating structure gyroscope - Wikipedia, the free encyclopedia
		It is therefore much simpler and cheaper than is a conventional rotating gyroscope of similar accuracy.
		Tilt of the wheel is measured to produce a signal related to the rate of rotation.
		The oscillation can also be induced and controlled in the vibrating structure gyroscope for the positionning of spacecrafts such as Cassini-Huygens.
	en.wikipedia.org /wiki/Vibrating_structure_gyroscope (594 words)

	Vibrating Structure Gyroscope Silicon-VSG
		The Si-VSG uses a vibrating ring to produce Coriolis effect, causing a linear DC output proportional to angular velocity.
		Unlike other types of gyros that use beams and/or tuning-forks, the Si-VSG has excellent rejection on external vibration and amazingly stable temperature characteristics.
		Vibrate the sensor element (ring resonator) at its resonance (Mode-1).
	www.spp.co.jp /English/jigyou/sirikon-e.html (89 words)

	Amazon.com: "vibrating beam accelerometer": Key Phrase page (Site not responding. Last check: 2007-10-09)
		But note that the vibrating beam accelerometer and ring laser gyro are open-loop instruments with very good performance, as we shall see in later chapters.
		Vibrating beam accelerometer whose frequency of vibration is a measure of tensile force and hence acceleration.
		or vibrating-beam accelerometer, is based on the dependence of the resonant frequency of a vibrating element,...
	www.amazon.com /phrase/vibrating-beam-accelerometer (516 words)

	Components in Electronics - CIE
		The new technology designated VSG-4, meaning fourth-generation Vibrating Structure Gyroscope, offers the high integrity and accuracy with digital control, and an extensive self-test capability.
		Vibrating Structure Gyros use a tiny vibrating silicon ring to detect angular velocity through the Coriolis Effect.
		The use of digital rather than analogue closed loop control of ring vibration amplitude and frequency enhances integrity, accuracy and reliability.
	www.cieonline.co.uk /cie2/articlen.asp?pid=&id=13371 (161 words)

	RESEARCH
		MEMS gyroscopes are typically designed to measure angular rate of rotation.
		A measurement of the angle itself is useful in many applications but cannot be obtained by integrating the angular rate due to the presence of bias errors which cause a drift.
		The design is based on the principle of measuring the angle of free vibration of a suspended mass with respect to the casing of the gyroscope.
	www.me.umn.edu /labs/advcontrols/gyroscope.html (474 words)

	Microgyrometers
		The rate gyroscope uses Coriolis effect of sensor element(vibrating resonator chip) to sense the speed of rotation(rate of turn).
		MEMS gyroscopes are vibratory systems operating on the principle of induced motion by the inertial Coriolis force.
		The micromachined structure shown(right) is the result of merging the ring device and comb structure.
	www.ucalgary.ca /~jjscarle/Gyro_Web/4.3.htm (684 words)

	Indian Journal of Engineering & Materials Sciences - Feb.05
		It is essential not only to evaluate the structural integrity of an existing pavement but also to have accurate information on pavement surface condition in order to establish a reasonable pavement rehabilitation design system.
		Backcalculating the pavement layer moduli is a well-accepted procedure for the evaluation of the structural capacity of pavements.
		These results have been discussed and explained on the basis of changes in the structure of the glass matrix by the addition of the halide ions of different sizes, IR spectra and ion transport studies.
	www.niscair.res.in /ScienceCommunication/ResearchJournals/rejour/ijems/ijems2k5/ijems_feb05.asp (1607 words)

	Gyroscope: Encyclopedia II - Gyroscope - Properties
		Gyroscope - Properties: Encyclopedia II - Gyroscope - Properties
		Gyroscope, Gyroscope - Simple Diagram and Description, Gyroscope - History, Gyroscope - Properties, Gyroscope - Gyrostat
		Gyroscope, Gyroscope - Gyrostat, Gyroscope - History, Gyroscope - Properties, Gyroscope - Simple Diagram and Description, Gyrocompass, Fibre optic gyroscope, Ring laser gyroscope, Vibrating structure gyroscope, Gimbal, Gimbal lock, Quantum gyroscope, Gyrocar, Top, Aerotrim, Dynabee, Eric Laithwaite, Precession
	www.experiencefestival.com /a/Gyroscope_-_Properties/id/1447899 (581 words)

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