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Cylindrical Vibratory Gyroscope
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Book Synopsis Cylindrical Vibratory Gyroscope by : Xuezhong Wu
Download or read book Cylindrical Vibratory Gyroscope written by Xuezhong Wu and published by Springer Nature. This book was released on 2021-06-19 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces readers to the shell structure, operating principle, manufacturing process, and control theory for cylindrical vibratory gyroscopes. The cylindrical vibratory gyroscope is an important type of Coriolis vibratory gyroscope that holds considerable potential for development and application. The main aspects addressed include: operating principle and structure, theoretical analysis and modeling, dynamic analysis and modeling, manufacturing process, parameter testing methods, closed-loop control, and the error compensation mechanism in cylindrical vibratory gyroscopes.
Book Synopsis Vibratory Gyroscopes Based on Micro-Electro-Mechanical and non-Micro-Electro-Mechanical Systems by : Valeri V. Chikovani
Download or read book Vibratory Gyroscopes Based on Micro-Electro-Mechanical and non-Micro-Electro-Mechanical Systems written by Valeri V. Chikovani and published by Cambridge Scholars Publishing. This book was released on 2023-12-15 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a unified approach for the two versions of Coriolis vibratory gyroscopes: Micro-Electro-Mechanical System (MEMS) and non-MEMS. It describes a new, differential mode of operation, analyzing the new triple mode gyro—rate, rate-integrating, and differential. The latter provides the gyro with an increased versatility by providing the maximum possible accuracy under changeable motion parameters and environmental conditions. The book also presents computer simulation, experiments, and test results on the rejection of external disturbances, and considers the fabrication processes of MEMS, metallic and quartz resonators. It will interest researchers, scientists, engineers, and students specializing in the field of inertial sensors, as well as engineers of digital control systems, and inertial sensors test-engineers. It can also be used as a reference book when designing vibratory gyros.
Book Synopsis Imperfections in a Cylindrical Vibratory Gyroscope by : Mercy Nduku Ngungu
Download or read book Imperfections in a Cylindrical Vibratory Gyroscope written by Mercy Nduku Ngungu and published by . This book was released on 2014 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses that In 1890 Bryan observed that a rotating vibrating structure tends to have a vibrating pattern that rotates at a rate proportional to the rate of rotation. This is otherwise known as the Bryan effect. Based on this theory a formula, the so-called "Bryan’s factor" was derived to quantify this shift in angular velocity. This study will utilise the linear theory developed in Joubert, Shatalov and Fay (2009, [9]) with an assumption that the rotation rate is constant and much smaller than the lowest eigenvalue of the vibrating system. This theory is used in conjunction with the math mathematical model formulated to determine how to include mass-imperfections and pre-stress using a non-linear theory of elasticity, as well as how to include anisotropic (viscous) damping into an equation of motion using Rayleigh dissipation (see Joubert et al. (2011, [10])). Hence, the problem statement of this research study is to investigate the influence of mass-imperfections and linear anisotropic (viscous) damping on the angle of vibrating pattern and the phase shift of the vibrating pattern of a slowly rotating thin cylindrical body.
Book Synopsis MEMS Vibratory Gyroscopes by : Cenk Acar
Download or read book MEMS Vibratory Gyroscopes written by Cenk Acar and published by Springer Science & Business Media. This book was released on 2008-12-16 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: MEMS Vibratory Gyroscopes provides a solid foundation in the theory and fundamental operational principles of micromachined vibratory rate gyroscopes, and introduces structural designs that provide inherent robustness against structural and environmental variations. In the first part, the dynamics of the vibratory gyroscope sensing element is developed, common micro-fabrication processes and methods commonly used in inertial sensor production are summarized, design of mechanical structures for both linear and torsional gyroscopes are presented, and electrical actuation and detection methods are discussed along with details on experimental characterization of MEMS gyroscopes. In the second part, design concepts that improve robustness of the micromachined sensing element are introduced, supported by constructive computational examples and experimental results illustrating the material.
Book Synopsis Coriolis Vibratory Gyroscopes by : Vladislav Apostolyuk
Download or read book Coriolis Vibratory Gyroscopes written by Vladislav Apostolyuk and published by Springer. This book was released on 2015-08-12 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the latest theoretical analysis and design methodologies of different types of Coriolis vibratory gyroscopes (CVG). Together, the chapters analyze different types of sensitive element designs and their kinematics, derivation of motion equations, analysis of sensitive elements dynamics in modulated and demodulated signals, calculation and optimization of main performance characteristics, and signal processing and control. Essential aspects of numerical simulation of CVG using Simulink® are also covered. This is an ideal book for graduate students, researchers, and engineers working in fields that require gyroscope application, including but not limited to: inertial sensors and systems, automotive and consumer electronics, small unmanned aircraft control systems, personal mobile navigation systems and related software development, and augmented and virtual reality systems.
Book Synopsis Whole-Angle MEMS Gyroscopes by : Doruk Senkal
Download or read book Whole-Angle MEMS Gyroscopes written by Doruk Senkal and published by John Wiley & Sons. This book was released on 2020-06-16 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the mathematical framework, technical language, and control systems know-how needed to design, develop, and instrument micro-scale whole-angle gyroscopes This comprehensive reference covers the technical fundamentals, mathematical framework, and common control strategies for degenerate mode gyroscopes, which are used in high-precision navigation applications. It explores various energy loss mechanisms and the effect of structural imperfections, along with requirements for continuous rate integrating gyroscope operation. It also provides information on the fabrication of MEMS whole-angle gyroscopes and the best methods of sustaining oscillations. Whole-Angle Gyroscopes: Challenges and Opportunities begins with a brief overview of the two main types of Coriolis Vibratory Gyroscopes (CVGs): non-degenerate mode gyroscopes and degenerate mode gyroscopes. It then introduces readers to the Foucault Pendulum analogy and a review of MEMS whole angle mode gyroscope development. Chapters cover: dynamics of whole-angle coriolis vibratory gyroscopes; fabrication of whole-angle coriolis vibratory gyroscopes; energy loss mechanisms of coriolis vibratory gyroscopes; and control strategies for whole-angle coriolis vibratory gyro- scopes. The book finishes with a chapter on conventionally machined micro-machined gyroscopes, followed by one on micro-wineglass gyroscopes. In addition, the book: Lowers barrier to entry for aspiring scientists and engineers by providing a solid understanding of the fundamentals and control strategies of degenerate mode gyroscopes Organizes mode-matched mechanical gyroscopes based on three classifications: wine-glass, ring/disk, and mass spring mechanical elements Includes case studies on conventionally micro-machined and 3-D micro-machined gyroscopes Whole-Angle Gyroscopes is an ideal book for researchers, scientists, engineers, and college/graduate students involved in the technology. It will also be of great benefit to engineers in control systems, MEMS production, electronics, and semi-conductors who work with inertial sensors.
Book Synopsis Allgemeine Bekanntmachung der geschehenen Errichtung des Kgl. Hannoverschen Guelphen-Ordens by :
Download or read book Allgemeine Bekanntmachung der geschehenen Errichtung des Kgl. Hannoverschen Guelphen-Ordens written by and published by . This book was released on 1815 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Coupled Vibratory Gyroscope Network with Bi-directional, Uni-directional, and Direct Coupling by :
Download or read book A Coupled Vibratory Gyroscope Network with Bi-directional, Uni-directional, and Direct Coupling written by and published by . This book was released on 2011 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, inertial sensors have been extensively studied and thoroughly researched to enhance their performance and robustness, overcoming great challenges for better innovations. The complicated fabrication processes of inertial sensors' manufacturing may potentially cause defects and lead to the reduction in their capabilities for detection of signals while environmental factors such as temperature can pose other obstacles and prevent the devices from obtaining the desired strength or stability. Among the many technologies that currently develop micromachined gyroscopes, MEMS (Microelectromechanical Systems) have been one of the fastest growing technologies used for gyroscope manufacturing due to their low-cost. However, one of the greatest challenges of the MEMS technology for micromachined gyroscopes is that it does not meet the requirements for inertial guidance systems. In this work, an approach is proposed to improve the robustness of a Coupled Inertial Navigation Sensor (CINS) System, which consists of a ring of vibratory gyroscopes coupled along their driving axes, bi-directionally, uni-directionary, and directly. While the sum response of synchronized states gains a larger output than an individual one, the purpose of the coupling in the drive-mode is to enhance the sensitivity and minimize the negative effects of the drift rate in a CINS device. Intensive numerical simulations are performed to investigate the behavior of this high dimensional system and its response to changes in parameters, mainly the number of gyroscopes, Coriolis force, and coupling strength. Bifurcation diagrams outlining the response of the system are obtained numerically with the aid of the continuation software AUTO 2000 and XPP. Individual behaviors, including synchronization, are further analyzed using analytical methods based on perturbation theory. The Lyapunov-Schmidt reduction is applied to determine the stability properties of the synchronized solution, which emerges through a pitchfork bifurcation that can be either supercritical or subcritical, depending on the coefficients of the nonlinear terms in the governing equations of motion. Abstract group theory is also used to predict the different patterns of motion for different ring sizes. The study of stochastic noise, assumed to be Gaussian band-limited, is explored extensively to investigate the benefits of the coupling systems over the un-coupled ones. Results show that coupling can reduce phase drift and even lead to a new concept of a drive-free gyroscope system.
Book Synopsis Dual-Mass Linear Vibration Silicon-Based MEMS Gyroscope by : Huiliang Cao
Download or read book Dual-Mass Linear Vibration Silicon-Based MEMS Gyroscope written by Huiliang Cao and published by Springer Nature. This book was released on 2023-04-17 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the key technologies in the manufacture of double-mass line vibrating silicon micromechanical gyroscope, respectively. The design of gyrostructure, detection technology, orthogonal correction technology, the influence of temperature and the design of measurement and control system framework are introduced in detail, with illustrations for easy understanding. It presents the principle, structure and related technology of silicon-based MEMS gyroscope. The content enlightens the researchers of silicon-based MEMS gyroscopes and gives readers a new understanding of the structural design of silicon-based gyroscopes and the design of dual-mass gyroscopes.
Book Synopsis MEMS Vibratory Gyroscopes by : Cenk Acar
Download or read book MEMS Vibratory Gyroscopes written by Cenk Acar and published by . This book was released on 2008 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Design, Dynamics, and Control of Micro Vibratory Gyroscopes by : Seyed Parsa Taheri Tehrani
Download or read book Mechanical Design, Dynamics, and Control of Micro Vibratory Gyroscopes written by Seyed Parsa Taheri Tehrani and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-machined vibratory gyroscopes are very small devices (up to a few millimeters in dimension) that work based on Coriolis force coupling between two resonance modes. The small size, low power consumption, and cheap price make these sensors popular in automotive, gaming, smart phones, and robotics industries. These sensors referred to as MEMS (microelectromechanical system) gyroscopes are currently not used for navigation applications because due to their miniature size and imperfections in fabrication methods they do not have enough accuracy. In this thesis, we present methods in design and control algorithms for MEMS vibratory gyroscopes to cancel the effect of imperfections in fabrication and improve gyroscopes' performance. First chapter of this thesis is an introduction on MEMS vibratory gyroscopes and their principles and standard operations modes.The second chapter presents the structural design and analysis of a single-structure 3-axis MEMS gyroscope. The gyroscope has four resonant modes of interest and uses a decoupling mechanism whereby auxiliary masses are used to actuate the drive mode of the gyroscope in order to reduce drive-force coupling to sense modes' motion (one of the sources of errors in MEMS gyroscopes). The use of auxiliary masses results in a two degree-of-freedom (DOF) mechanism of the drive mode. To compare the effectiveness of using auxiliary masses two gyroscope types has been design one actuated from auxiliary masses (type A) and one actuated from major masses (type B). The two designs are simulated analytically to study the displacement of each mass in each design while comparing the force required to achieve that displacement for drive mode. Experimental data from fabricated devices show how using auxiliary masses will decrease drive force coupling and as a result improve the gyroscope's performance. Third chapter describes the operation of a high quality factor gyroscope in various regimes where electromechanical nonlinearities introduce different forms of amplitude-frequency (A-f) dependence. Experiments are conducted using an epitaxially-encapsulated 2 x 2 mm2 quad-mass gyroscope (QMG) with a quality factor of 85,000. The device exhibits third-order Duffing nonlinearity at low bias voltages (15 V) due to the mechanical nonlinearity in the flexures and at high bias voltages (35 V) due to third-order electrostatic nonlinearity. At intermediate voltages (26 V), these third-order nonlinearities cancel and the amplitude-frequency dependence is greatly reduced. A model is developed to demonstrate the connection between the electromechanical nonlinearities and the amplitude-frequency dependence, also known as the backbone curve. Gyroscope operation is demonstrated in each nonlinear operating regime and the key performance measures of the gyroscope's performance, angle random walk (ARW) and bias instability, are measured as a function of drive-mode vibration amplitude. While the bias instability is nearly independent of the drive-mode’s nonlinearity, we find that ARW increases when the third-order nonlinearities are minimized, and the decrease in ARW due to increase of amplitude is independent of drive mode's type of nonlinearity.In the fourth chapter we present a direct angle measurement method in gyroscopes. Towards the objective of direct angle measurement using a rate integrating gyroscope (RIG) without a minimum rate threshold and performance limited only by electrical and mechanical thermal noise, in this chapter we present the implementation of a generalized electronic feedback method for the compensation of MEMS gyroscope damping asymmetry (anisodamping) and stiffness asymmetry (anisoelasticity) on a stand-alone digital signal processing (DSP) platform. Using the new method, the precession angle dependent bias error and minimum rate threshold, two issues identified by Lynch for a MEMS RIG due to anisodamping are overcome. To minimize angle dependent bias, we augment the electronic feedback force of the amplitude regulator with a non-unity gain output distribution matrix selected to correct for anisodamping. Using this method, we have decreased the angle dependent bias error by a factor of 30, resulting a minimum rate threshold of 2.5 dps. To further improve RIG performance, an electronically-induced self-precession rate is incorporated and successfully demonstrated to lower the rate threshold.
Book Synopsis Mechanical Analysis and Design of Vibratory Micromachined Gyroscopes by : Wyatt Owen Davis
Download or read book Mechanical Analysis and Design of Vibratory Micromachined Gyroscopes written by Wyatt Owen Davis and published by . This book was released on 2001 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Collective Behavior of a Three-vibratory Gyroscope System with Coupling Along the Drive-and Sense-modes by :
Download or read book Collective Behavior of a Three-vibratory Gyroscope System with Coupling Along the Drive-and Sense-modes written by and published by . This book was released on 2011 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inertial navigation systems (INS) have been studied extensively to increase their performance and enhance robustness. One critical component of the INS is the gyroscope, which is used for detecting orientation. These gyroscopes are subject to material imperfections and manufacturing defects potentially reducing their ability to detect signals and reduce phase drift. One common type of vibratory gyroscope is manufactured based on MEMS (Micro-electromechanical Systems) technology, which yields small gyroscopes at lower costs. However, with low cost gyroscopes comes a quality trade-off, specifically for inertial guidance systems. For this reason, this work explores the idea of improving the performance of vibratory gyroscopes by combining the input-output response of an ensemble of gyroscopes coupled in a ring fashion. More specifically, bidirectional coupling in both axes is investigated. Numerical simulations and analytical work show that this coupling causes the sum of the response in the synchronized state to have a larger output than an individual gyroscope. This reduces the negative effects of phase drift and positively influences the sensitivity. Numerical and analytical bifurcation diagrams also reveal regions of synchronization for given coupling strength and input rotation parameters. To demonstrate robustness this work focuses on two types of noise, variation in mass and contamination of the target signal. When subjected to this noise, improvement in phase drift is seen when the coupled gyroscopes systems are numerically compared to uncoupled systems.
Book Synopsis Strapdown Inertial Navigation Technology by : David Titterton
Download or read book Strapdown Inertial Navigation Technology written by David Titterton and published by IET. This book was released on 2004 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inertial navigation is widely used for the guidance of aircraft, missiles ships and land vehicles, as well as in a number of novel applications such as surveying underground pipelines in drilling operations. This book discusses the physical principles of inertial navigation, the associated growth of errors and their compensation. It draws current technological developments, provides an indication of potential future trends and covers a broad range of applications. New chapters on MEMS (microelectromechanical systems) technology and inertial system applications are included.
Book Synopsis A High Aspect-ratio High-performance Polysilicon Vibrating Ring Gyroscope by : Farrokh Ayazi
Download or read book A High Aspect-ratio High-performance Polysilicon Vibrating Ring Gyroscope written by Farrokh Ayazi and published by . This book was released on 2000 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digest of Technical Papers written by and published by . This book was released on 2003 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Material-Integrated Intelligent Systems by : Stefan Bosse
Download or read book Material-Integrated Intelligent Systems written by Stefan Bosse and published by John Wiley & Sons. This book was released on 2018-03-12 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combining different perspectives from materials science, engineering, and computer science, this reference provides a unified view of the various aspects necessary for the successful realization of intelligent systems. The editors and authors are from academia and research institutions with close ties to industry, and are thus able to offer first-hand information here. They adopt a unique, three-tiered approach such that readers can gain basic, intermediate, and advanced topical knowledge. The technology section of the book is divided into chapters covering the basics of sensor integration in materials, the challenges associated with this approach, data processing, evaluation, and validation, as well as methods for achieving an autonomous energy supply. The applications part then goes on to showcase typical scenarios where material-integrated intelligent systems are already in use, such as for structural health monitoring and smart textiles.
