The dtg signals contain noise and random drift due to the influence of the. James objectives to qualitatively observe some of the motions of a gyroscope. Digital rebalance loop design for a dynamically tuned gyroscope using h 2 methodology digital rebalance loop design for a dynamically tuned gyroscope using h 2 methodology woo song, jin. It can be run inside casing, tubing, drill pipe and magnetically disturbed ground. In the 1940s engineers in scotland designed a gyro which used a spinning. The natural frequencies and vibration modals of dtg in the cases of both being stationary and rotating. Nutation damping of dynamically tuned gyroscopes 15 march 2017 matec web of conferences, vol.
This architecture allows for a high degree of structural symmetry degeneracy of modes, potentially enabling high precision rate gyroscopes rg and rate integrating gyroscopes rig. Presented in this paper is a widebandwidth digital torquing rebalance loop for a dynamically tuned gyroscope dtg based on h 2 methodology. The condor pacific tg400 is a rugged high performance dynamically tuned gyroscope designed to meet the requirements of stabilization, navigation, and demanding wellbore surveying needs of both strap down and gimbaled applications. The augmented plant model including gyroscope and integrator is composed. A new hybrid gyroscope with electrostatic negative. The augmented plant model including gyroscope and integrator is.
Gypro offers high bias stability, low noise and low latency. It shows how gyroscopes can be used in inertial guidance systems, and the problem of gimbal lock. In this chapter, first a historical outline of the theory of gyroscopes is given. Pdf development of a dynamically tuned gyroscopedtg. Keywordsrate integrating mems gyroscope, whole angle. Pdf this work describes the design and the implementation of a dtg gyroscope. An alternative class designation for gyroscopes that cannot be categorised in this way, is not surprisingly called unconventional sensors, some of which are solidstate devices. Minimal realization of dynamically balanced lumped mass. This specification defines the requirements for a twodegreeoffreedom dynamically tuned gyro to be used as a sensor in a strapdown, gimballed inertial navigation system attitude reference units for use in an aircraft, a missile, a spacecraft or similar applications.
A gyroscope measures angular velocity specified in mvdegs. Two degrees of freedom miniaturized gyroscope based on active. This paper proposed a method to analyses and obtain the vibration identities of dtg dynamically tuned gyroscope within the vibrationoverloading environment based on ansys11. The dtg is also suitable for application to stabilized electrooptical sights, though little appears in the literature on this subject. Feb 24, 2008 related mechanical engineering news on. We believe dual foucault pendulum is the minimal realization of a dynamically balanced lumped mass whole angle wa gyroscope. A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow a wheel mounted on the innermost gimbal to have an orientation remaining independent of the orientation, in space, of its support. Using the multibody dynamics module in comsol multiphysics, we can simulate the mechanical properties of a gyroscope. Specification format guide and test procedure for twodegreeof freedom, dynamically. The gyro instrument is a highly accurate, extremely reliable downhole directional survey and orientation tool.
High precision dynamically tuned gyroscope and gimbal suspension. Tg400 dynamically tuned gyroscope rate gyroscope tuned. Two axis dynamically tuned gyro dtg leveraging our extensive tuned gyroscope technological expertise, utc aerospace systems has produced the fg314, a two axis dynamically tuned gyro. Fiber optic gyroscope, ring laser gyroscope or hemispheric resonant gyroscope and others technologies dynamically tuned gyroscope, it also details each application and key existing markets, especially the most promising emerging ones.
Accelerometer versus gyroscope before describing some mems applications, we must understand the differences between an accelerometer and a gyroscope. First, think of the gyroscope rotor mounted in bearings in a gimbal, as shown in figure 4. The very broad and expanding class of unconventional sensors includes. How to attach the motor to the super gyroscope youtube. But as it turns out, there is a fairly straightforward way of understanding the physics of gyroscopes without. Figure 2 now consider a disc spinning about the x axis with velocity. However, the dynamic inertia from the gyroscopic reaction effect from the gimbal provides negative spring stiffness proportional to the square of the spin speed howe and savet, 1964. As it is a north seeking gyro, all measurements are in reference to geographic north. New utas prod data sheet fg314 uk metric rev c 2017. A dynamic tuned gyroscope, the socalled dtg, is one of the options nowadays that can provide the required performance for many applications at a reasonable price. The flexure spring stiffness is independent of spin rate.
A new hybrid gyroscope with electrostatic negative stiffness. A gyroscope is a device used for measuring or maintaining orientation and angular velocity. Ere6 dynamical tuned gyro sensor ere6 is of medium and low precision. The torque constant is equal to the ratio of the output torque to the output angular displacement. This paper presents a novel micro dynamically tuned gyroscope mdtg with adjustable static capacitance. Dynamically tuned gyro as claimed in claim 1 characterized in that the flat coils 68, 70. January 4, 2018 abstract the series of papers on gyroscopes is completed by the full lagrangian theory of gyroscopes including external torque.
The dynamic tuning of a dynamically tuned gyroscope dtg refers to a clever gimbal configuration that balances. This configuration allows the gyro rotor to spin to a free rotor in two axes. Namun, inersia dinamis dari efek reaksi gyroscopic dari gimbal menyediakan kekakuan pegas negatif sebanding dengan kuadrat dari kecepatan putaran howe dan savet, 1964. Theory a gyroscope is defined as a rigid rotating object, symmetric about one axis. Inertial sensors gyroscopes and accelerometers are an important.
Our modeling gyroscopic effect tutorial model focuses on such studies. Savet, the dynamically tuned free rotor gyro, control engineering, pp. The method of high accuracy for dynamically tuned gyroscope is presented. Odintsov, theory and computation of gyroscopic systems.
The dtg is a high precision technology which, due to its size, accuracy, reliability and shock resistance, is used in many different applications. Elements of gyroscope classification are introduced, and then the evolution of the gyroscope concept is presented. Digital rebalance loop design for a dynamically tuned. Gyroscope project gutenberg selfpublishing ebooks read. The basic scheme of the interferometric fiber optic gyroscope ifog is illustrated in figure 16. Dynamically tuned gyro dtg is a kind of two degree of freedom inertial sensor with a specially flexible joint. A micro dynamically tuned gyroscope with adjustable static. Dec 06, 2014 how to attach the motor to the super gyroscope from gyroscope. Gyroscopes figure 1 a gyroscope is a spinning disc mounted in gimbals so that it may pivot in the x, y and z axis.
Gyroscope physics is one of the most difficult concepts to understand in simple terms. The gyro was surprisingly unstable, and arnold and maunder at the university of edinburgh showed that the dynamic inertia effects of the gimbal in the universal joint were responsible for the strange behavior. Abstract the dynamic tuning of a dynamically tuned gyroscope dtg refers to a clever gimbal configuration that balances the torques from the support flexures with dynamic spring torques created by gimbal flutter while the gyro rotor spins. A gyroscope is a wheel mounted in two or three gimbals, which are pivoted supports that allow the rotation of the wheel about a single axis. Litisr mems near tactical grade inertial measurement unit imu. This is a demonstration of a homemade gyroscope and gimbal set. The momentum of such a wheel causes it to retain its attitude when the framework is tilted. Dynamically tuned gyroscopes in stabilized electrooptical. A gyro compass installation is a relatively simple operation and you should be able to accomplish this quickly without the need for specialized personnel or equipment. Minimal realization of dynamically balanced lumped mass wa. This gyroscope was tested on the rotational rate table at the separation of 50hz resonant frequencies by dynamically tuning feedback loop.
Proposal for a micromachined dynamically tuned gyroscope. Ein kreiselinstrument, auch kreiselstabilisator oder gyroskop griechisch gyros, deutsch. Elements of gyroscope classification are introduced, and then the evolution of the gyroscope. The characteristics of the external capture electronics are considered where necessary to define gyro. Comprising of the latest technology, the eds system uses gyro compassing method to find direction. The plant model is generated using experimental frequency response data.
Ere1 gyroscope for downhole survey ericco international. Theory and design of micromechanical vibratory gyroscopes. Next, some simulations under the optimized structure parameters are given as a reference for the mask design of the rotor wafer and electrode plates. Dynamically tuned gyroscopes in stabilized electrooptical sights. Giroskop wikipedia bahasa indonesia, ensiklopedia bebas. Control of mems coriolis vibratory gyroscopes page 2 theoretical background a gyroscope is an inertial device for measuring the angle of orientation or angular rate of rotation with respect to the inertial frame of reference. A comb driving vibratory micro gyroscope, which utilizes the dynamically tunable resonant modes for a higher rate sensitivity without an accelerational error, has been developed and analyzed. Sebuah dynamically tuned gyroscope dtg adalah sebuah rotor ditangguhkan oleh gabungan universal dengan pivot lentur. The gypro high performance mems gyroscopes product line has been specifically designed for applications that are more demanding than automotive, while not requiring tactical grade fog fiber optic gyros or dtg dynamically tuned gyros.
In this paper, the operating principle of a micromachined, dynamically tuned gyroscope, based on a contactless suspension is discussed and its mathematical model is derived. The characteristics of the resonance depending of generalized parameter and influence of balance variation. Specifications ginsensitive drift random drift tuned gyroscope, the socalled dtg, is one of the options nowadays that can provide the required performance for many applications at a reasonable price. The stabilization of a northseeking platform using a. Tiny optical cavity could make quantum networks possible. The condor pacific tg266 is a rugged high performance dynamically tuned gyroscope designed to meet the requirements of stabilization, navigation, and demanding wellbore surveying needs of both strap down and gimbaled applications. In the 1940s engineers in scotland designed a gyro which used a spinning flywheel on a universal hookes joint figure 9. Applications of gyroscopes include inertial navigation systems, such as in the hubble telescope, or inside the steel hull of a. Projecting the outcomes of peoples lives with ai isnt so simple. They demand considerable less investment in materials, machinery, processes and man power when compared to the other usual sensors such as the floated or ringlaser gyroscopes. The gyroscope a large acquaintance with particulars often makes us wiser than the possession of abstract formulas, however deep. Abstracta variety of gyroscopes have been extensively studied due to their capability of precision. In this paper, we propose a shock survivability strategy intended for dynamically ampli.
In particular, design of the vibratory sensitive element can be. A dynamically tuned gyroscope dtg is a rotor suspended by a universal joint with flexure pivots. A novel calibration procedure for dynamically tuned gyroscope. Nov 01, 20 read a novel calibration procedure for dynamically tuned gyroscope designed by doptimal approach, measurement on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Modal analysis of dynamically tuned gyroscope based on. The volume of domestic flexible gyros is the smallest, the mass is extremely light, the starting speed is fast 3s synchronization, and the antivibration and impact capability is very strong. Keywords keywordsdrift error, dynamically tuned strapdown gyroscope. Introduction gyroscope, any device consisting of a rapidly spinning wheel set in a framework that permits it to tilt freely in any direction. As a traditional high precision gyroscope the bias stability is usually around 0. Specification format guide and test procedure for twodegreeof. When people see a spinning gyroscope precessing about an axis, the question is inevitably asked why that happens, since it goes against intuition.
The method of high accuracy at dynamically tuned gyroscope. Pdf dynamically tuned gyroscopes dtgs are one the most common sensors which widely used in navigation fields. Now they are in most tablets and smartphones, to provide orientation along 3 axes, typically in. The guaranteed accuracy of the meridian gyrocompass is obtained through specialised high quality engineering. Dynamically tuned vibratory micromechanical gyroscope.
The most common mems gyroscope is the cvg which is a massspringdamper. A teledyne tss navigation systems datasheet meridian. Two stabilization loops work simultaneously for the overall stabilization of the optical sensor in the space. When the gimbals are restrained by springs see figures 1, 2a, 2b and 3 the gyroscope would oscillate with a natural frequency 6, where k is the torque constant and i k. It has two input axes which are mutually orthogonal and which lie in a plane which is perpendicular to the spin axis of the gyroscope. The role and the importance of a rebalance loop are explained first. Therefore, this gyroscope has a high ratesensitivity without an acceleration error, and also can be used for a resonant accelerometer. Finite element model of dtg was constructed by ansys11.
Complete gyroscopic motion with external torque horst eckardt1 a. Stability analysis of a dynamically tuned gyroscope. First, the principle of mdtg is theoretically analyzed. The dynamically tuned gyroscope dtg has been marketed primarily as a lowcost, smallpackage, twoaxis rate sensors for tactical missiles and is used widely in this application. Specifications ginsensitive drift random drift dynamically tuned gyroscope dtg using bond graph according to its. Dags, similar to any other gyroscopes designed for high performance, operate at a. Effective calibration and compensation of the deterministic errors of dynamically tuned gyroscope dtg are crucial in improving the application precision and performance of dtg. Two degrees of freedom miniaturized gyroscope based.
Modeling the dynamically tuned gyroscope in support of high. The dynamic response of the compass is examined in detail and its accuracy as a northseeking device is assessed. Apr 21, 1992 similarly constructed, electrically caged, dynamically tuned gyros are illustrated and described in dea128 34 379, as well as deb224 29 9 and dec12 81 216. Next step involves consideration of the general design of the sensitive element and its mathematical representation. The fg314 offers excellent bias, drift and noise performance key parameters for applications such as stabilised platforms, missile seekers and missile guidance. Classical dynamically tuned gyroscope dtg is an example of the rotary vibratory gyroscope. Tg266 dynamically tuned gyroscope rate gyroscope tuned. Ansiieee standard 81988 ieee specification format guide and test. The example, which we will discuss next, is actually comprised of two models.
Unlike other downhole survey or magnetic tools, the gyrotracera is not affected by magnetic interference. The mathematical description and calculation of the gyroscope. Accelerometers measure linear acceleration specified in mvg along one or several axis. Dynamically tuned vibratory micromechanical gyroscope accelerometer lee, byeungleul. In the epa20 251 157, an inertial detector arrangement having an electrically caged, dynamically tuned gyro is described in which the caging circuit operates digitally. Mems gyroscopes are based on vibrating masses are vibration gyro and have appeared in 1997 for dynamic control of automobiles robert bosch corporation. The surface micromachining technology is used to fabricate the gyroscope having a vibrating part of 400 x 600 micrometers with 6 mask process, and the. I is the composite moment of inertia of the inner gimbal plus rotor. The paper shows that the ideally tuned hookes joint gyroscope is capable of operating as a gyrocompass. Homemade gyroscope demonstration, gimbal lock, and. Errors of the dynamically tuned strapdown gyroscope to constant. Dynamical analysis based on this mathematical model for the case in which the contactless suspension provides hard electrical springs is conducted. Design and optimal control of line of sight stabilization.
918 1329 1218 310 881 1326 1590 448 807 1198 1050 1507 936 681 488 1658 273 1598 998 1101 1174 1499 834 1531 223 894 713 1366 723 496 255 1263 960 1019