Topic
Angular displacement
About: Angular displacement is a research topic. Over the lifetime, 5102 publications have been published within this topic receiving 46081 citations. The topic is also known as: rotational displacement.
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TL;DR: In this paper, a small-sized high-precision angular displacement measurement technology based on the sub-pixel level varying principle was proposed, which achieved a resolution of 20 bit and precision of 20.4″.
12 citations
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TL;DR: In this article, the position and orientation of a moving person on a flat surface (zero-slope) is determined through strategically placed sensors on the waist and knee of the human body.
12 citations
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TL;DR: In this article, an electrostatic rotary stepper micromotor was designed, fabricated, modeled, and characterized using 3-D finite-element analysis simulations that were corroborated by extensive characterizations performed in quasi-static, transient, and dynamic regimes.
Abstract: Flexible bearings are advantageous for microelectromechanical systems as they enable precise, accurate, repeatable, and reliable motion without frictional contact. Based on the principle of a rotary folded-beam suspension, we have designed, fabricated, modeled, and characterized an electrostatic rotary stepper micromotor in silicon. Using 3-D finite-element analysis simulations that were corroborated by extensive characterizations performed in quasi-static, transient, and dynamic regimes, we could establish a consistent electromechanical model of the motor. In particular, dynamic nonlinearities such as superharmonic and subharmonic resonances are well described by the proposed model. Two prototypes of monolithic three-phase stepper motors have been fabricated with standard silicon-on-insulator (SOI) technology, using either a two-mask or a single-mask process. The two-mask SOI motor has a rotor diameter of 1.4 mm and has an angular range of 30° (±15°) for a 65-V (130 Vpp) sinusoidal actuation. The single-mask SOI motor has a rotor diameter of 1.8 mm and incorporates a differential capacitive sensor for angular position measurement. It reaches a maximum angular speed of 1°/ms and has an angular range of 30° for a 23-V (46 Vpp) sinusoidal actuation. The exceptional performance of the motor and the demonstration of successful capacitive sensing make it suitable for use as an active joint module in future microrobotic applications.
12 citations
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04 Dec 2001
TL;DR: In this article, two Generalized ProportionalIntegral (GPI) feedback control schemes are proposed for the stabilization of the angular position of a DC-motor-actuated rotation inertia load, fixed to a wall by means of a rotation spring.
Abstract: In this article, two Generalized Proportional-Integral (GPI) feedback control schemes are proposed for the stabilization of the angular position of a DC-motor-actuated rotation inertia load, fixed to a wall by means of a rotation spring. The feedback schemes, which are not based on asymptotic observers nor calculations based on samplings, use only electrical variables measurements.
12 citations
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29 Jun 1992
TL;DR: In this paper, a pivoting control column (6), a shaft (7), and a connecting rod (10) which is articulated to the column and which is able to be displaced in translation parallel to its longitudinal axis following an angular displacement of the column in a second plane, are arranged between the first and second links.
Abstract: A device for the adjustment of the maneuver forces of movable members of an aircraft. The device includes: a pivoting control column (6); a shaft (7) which is articulated to the column and which is able to pivot around its axis following an angular displacement of the column (6) in a first plane; a first link (8) which is provided between the shaft and at least one first movable member (9), and which gives rise to the displacement of the at least one first movable member; a connecting rod (10) which is articulated to the column and which is able to be displaced in translation parallel to its longitudinal axis following an angular displacement of the column (6) in a second plane; a second link (11) which is provided between the connecting rod and at least one second movable member (12), and which gives rise to the displacement of the at least one second movable member; and friction unit (13) in order to apply the correct forces for the angular displacements of the column in the two planes, and which is arranged between the first and second links (8, 11). The device can be applied especially to the control of the cyclic plate of the rotor of a helicopter.
12 citations