Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 76 for “"Gyroscopes"”.
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Brillouin Coriolis gyroscopes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Studies in optical resonator gyroscopes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Performance limitations of vibratory gyroscopes.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. Sc.D.
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Adaptive Commanding of Control Moment Gyroscopes with Backlash
… times. Agile spacecraft often use control moment gyroscopes (CMGs) equipped with gear trains to efficiently provide torque for the fine attitude adjustments used in docking and precision stabilization maneuvers. A theoretical examination and a practical model is developed to study the …
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Novel Technique for Gait Analysis Using Two Waist Mounted Gyroscopes
… bipedal nature for gait analysis using two MEMS gyroscopes, one attached to each side of the lower waist. This setup allowed the step detection and discrimination from other non bipedal activities without the need for magnitude thresholds or training. We were also able to calculate the hip …
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Analysis and Compensation of Imperfection Effects in Piezoelectric Vibratory Gyroscopes
Vibratory gyroscopes are inertial sensors, used to measure rotation rates in a number of applications. The performance of these sensors is limited by imperfections that occur during manufacture of the resonators. The effects of resonator imperfections, in piezoelectric vibratory gyroscopes, were …
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The design and fabrication of an automated workstation for the manufacture of fiber optic gyroscopes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Astronaut-centric analysis of a jetpack with integrated control-moment gyroscopes for enhanced extravehicular activity performance
… in this research incorporates control moment gyroscopes (CMGs) into an extravehicular activity (EVA) jetpack device currently being considered at NASA Johnson Space Center (JSC). This Mobility Augmenting Jetpack with Integrated CMGs (MAJIC) system will offer rigid attitude control not …
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Tool design for and process optimization of an automated workstation for the manufacture of fiber optic gyroscopes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Design of an automated fiber pigtail preparation machine
Gyroscopes are inertial guidance devices. The first gyroscopes were mechanical and because of there excessive weight and cost, were used only in military and civilian aircraft. As technology improved, gyroscopes found wider applications, not only on aviation, but in submarines and even ground …
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A High-Q Micromachined Quatrefoil Suspension Gyroscope
… performances of Coriolis vibratory micromachined gyroscopes. Micro-electromechanical systems (MEMS) Coriolis vibratory gyroscopes (CVGs) are an increasingly popular choice for a wide range of applications thanks to their compact size, low power consumption, and low cost. However, despite recent …
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Finite element model of thermoelastic damping in MEMS
… factor measurements were performed on Draper gyroscopes made from boron doped silicon wafers with varying amount of germanium (0%, 2%, 23%, 30% ). The quality factors of gyroscopes with germanium were measured to be lower than those without germanium, due to increased anelastic damping. …
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Design of a spherical vehicle with flywheel momentum storage for high torque capabilities
… storage via counter-rotating control moment gyroscopes is proposed in order to overcome significant limitations in the performance of earlier designs of spherical vehicles. Analysis and design of a fully functioning spherical vehicle incorporating such a mechanism is completed and indicates …
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Adaptive Control of VSCMGs for Satellite Attitude Tracking
… such as reaction wheels (RWs), control moment gyroscopes (CMGs), and variable speed control moment gyroscopes (VSCMGs) allow satellites to obtain high levels of pointing accuracy with minimal fuel expenditure. However, uncertainty in these devices can significantly degrade their performance. …
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The Variable Vector Countermeasure Suit for space habitation and exploration
… of modules containing arrays of control moment gyroscopes (CMGs) which will be controlled to provide viscous resistance to motion against a specified direction. To reduce the coordination and sensorimotor problems seen during and following gravity level transitions, this resistance will be felt …
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Design and Implementation of a Pivot Shift Prototype for Quantitative Analysis
… various sensors including accelerometers and gyroscopes to provide force, orientation, and acceleration measurement. The prototype has been used to quantify the results of a medical test called pivot shift which tests the dynamic stability of the patients knee. With the initial prototype …
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Understanding and mitigating the privacy risks of smartphone sensor fingerprinting
… sensors such as microphones, accelerometers and gyroscopes to fingerprint smartphones. During fabrication, subtle imperfections arise in device sensors which induce distinctive anomalies in the generated signal. Using machine learning techniques we can distinguish smartphones generating such …
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Objective real-time motion analysis using wearable devices for post stroke rehabilitation
… and an iPad. The system uses accelerometers, gyroscopes, and magnetometers to measure movement during three single-tasked clinical activities: the functional reach test, the NIHSS motor arm test, and the NIHSS motor leg test. The proposed system has been extensively tested using emulated and …
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A human analog for benchmarking vestibular tests in a roto-tilt chair
… A sensor array consisting of accelerometers and gyroscopes was built to simulate vestibular function with the sensors positioned in a manner to replicate anatomic placement of the semicircular canals and otolith organs. The accelerometers and gyroscopes are commercially available …
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Vehicle design, flight control avionics, and flight tests for the Parent and Child Unmanned Air Vehicle
… estimates of aircraft attitude using low-cost gyroscopes is introduced. The planning and execution of several flight tests is presented.
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