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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Patent•
30 Mar 1990
TL;DR: In this article, a main body with a base and a screen-type dialogue means are placed in a flat casing connected to the main body by support means and means for maintaining the angular position.
Abstract: The device includes, on the one hand, a main body with a base (2) and, on the other hand, screen-type dialogue means (7) which are placed in a flat casing connected to the main body (2) by support means and means for maintaining the angular position (14) which can be regulated both for height and for angle. Said means for maintaining the angular position (14) are arranged coaxially to a pivoting axis XX' of a support arm (15) on the body (2) and include a free-wheel device mechanically located in series with a friction angular coupling device. The invention makes it considerably easier to adjust the position of the dialogue means.
17 citations
TL;DR: A robust sub-pixel subdivision algorithm based on the least square method is proposed to improve the robustness of image-type angle measurement and is shown to be more accurate and with better robust than the traditional algorithm (centroid algorithm).
17 citations
Patent•
11 Jun 2007TL;DR: In this paper, a three-dimensional non-contacting angular motion sensor, based on magnetometry, has been developed for velocity feedback in the ball wheel mechanism, which serves as the drivetrain for a class of omnidirectional mobile platforms.
Abstract: A three-dimensional non-contacting angular motion sensor, based on magnetometry, has been developed for velocity feedback in the ball wheel mechanism, which serves as the drivetrain for a class of omnidirectional mobile platforms. More generally, this scheme tracks rigid-body rotation about a fixed point with an undefined axis of rotation. The approach involves tracking the time-varying magnetic field of a permanent disc magnet, embedded at the center of the sphere. This data is then used to determine the absolute orientation of the magnet axis. Finally, an approach based on the natural invariants of rigid-body motion is used to determine the instantaneous axis of rotation and the angular speed of the sphere about this axis.
17 citations
TL;DR: In this article, the authors describe a piezoelectric motor with a direct coupling mechanism between the stator and rotor, where a clutch drives the rotor via locking it, and the direct coupling makes it possible to transmit the whole power generated in the piezolectric element to the rotor, and thus achieve the high efficiency of the motor.
Abstract: The letter describes a piezoelectric motor that combines the merits of piezoelectric materials, such as high power density generated at electromechanical resonance, and a precise control of displacement. The motor utilizes a direct coupling mechanism between the stator and rotor, where a clutch drives the rotor via locking it. The direct coupling makes it possible to transmit the whole power generated in the piezoelectric element to the rotor, and thus achieve the high efficiency of the motor. It also allows the combining of two regimes of operation: continuous rotation and a stepwise motion within a 360° interval with a high resolution of angular displacement.
17 citations
Patent•
26 Aug 1992
TL;DR: In this paper, a programmable, electronic, angular position indicator based upon engineering units is used to estimate the angular displacement of a rotating rotor, with the particular arrangement of teeth or other markings on the rotor.
Abstract: A programmable, electronic, angular position indicator, based upon engineering units, estimates the angular displacement of a rotating rotor. The angular position indicator is programmed with the particular arrangement of teeth (or other markings) on the rotor. Intermediate angular displacements are interpolated between a limited number of positive angular displacement indications. Offsets, due to acceleration or deceleration of the rotor, are corrected at each positive angular displacement indication without skipping the output of each interpolated angular displacement. Angular displacement is determined in standard engineering units.
17 citations