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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, two angular displacement sensors are spaced apart at a well-defined distance, and the rotor of each of these sensors is composed of an array of electrodes and sine-wave voltages with phase angles in the sequences 0 degrees, 90 degrees, 180 degrees, 270 degrees applied to it.
Abstract: The measurement of the torque in a mechanically loaded axle is often required for automotive power-train and engine-control systems. Torque sensing has been performed by mainly using strain gauges connected to the axle with slip rings to allow the electrical contacting. Noncontact magnetic and optical techniques have also been used. In the proposed capacitive torque sensor, two angular displacement sensors are spaced apart at a well-defined distance. The rotor of each of these capacitive displacement sensors is composed of an array of electrodes and sine-wave voltages with phase angles in the sequences 0 degrees , 90 degrees , 180 degrees , 270 degrees applied to it. These voltages are capacitively coupled from the stator to the rotor. The stator is also equipped with a readout electrode. The phase angle of the sine wave on this readout electrode is proportional to the rotor-to-stator electrode overlapping and thus proportional to the angular position. The phase difference between the output signals of the angular displacement transducers is a direct measure of the twist angle and thus of the torque in the axle. The sensor allows the noncontact torque measurement on a 10-mm-diameter steel axle in the 0-100-N-m range. >

40 citations

Patent
14 Apr 1981
TL;DR: The flexure universal joint for connecting a gyroscope to its driving member comprises a Cardan member hinged by a pair of co-axial spaced flexure joints of the kind described in this paper.
Abstract: The flexure joint for connecting two members for relative angular displacement comprises a pair of flexure leaves which merge with the members at their ends and cross each other and are rigidly connected with each other at the crossing point. Relative angular displacement of the members results in a flexure of the leaves. The flexure universal joint for connecting a gyroscope to its driving member comprises a Cardan member hinged by a pair of co-axial spaced flexure joints of the kind described hereinabove for relative angular displacement about a first hinge axis to the driving member and hinged by a second pair of co-axial spaced flexure joints of the same type to the gyroscope member for relative angular displacement about a second hinge axis, which intersects the axis of rotation of said gyroscope at right angles, said first hinge axis intersecting said second hinge axis and the axis of rotation of said driving member at right angles.

40 citations

Patent
09 Mar 2006
TL;DR: In this article, the tracking system records the 3D position of the survey tool, with angular offset errors, and the angular offset data is used to correct the position data, e.g. to reduce or eliminate errors caused by the angular displacement.
Abstract: Position measurements by a tracking system associated with a survey tool are corrected for tilt. The tracking station typically incorporates some offset from the surface across which a survey is conducted, and the offset will be subject to angular displacement as the tool tilts with respect to its normal orientation. The tracking system records the 3D position of the survey tool, with angular offset errors. In the disclosed examples, an inertia! measurement unit (IMU), a dual axis inclinometer or a combination of two single axis inclinometers measures the amount of angular offset. The angular offset data is used to correct the position data, e.g. to reduce or eliminate errors caused by the angular offset, e.g. from vertical. If the tool provides measurement data, e.g. GPR readings, processing of the measurement data from the survey tool uses the corrected position data, e.g. to produce images of sub-surface features or objects.

40 citations

Proceedings ArticleDOI
17 Dec 2015
TL;DR: This work proposes a sliding mode controller for in-hand manipulation that repositions a tool in the robot's hand by using gravity and controlling the slippage of the tool.
Abstract: In this work we propose a sliding mode controller for in-hand manipulation that repositions a tool in the robot's hand by using gravity and controlling the slippage of the tool. In our approach, the robot holds the tool with a pinch grasp and we model the system as a link attached to the gripper via a passive revolute joint with friction, i.e., the grasp only affords rotational motions of the tool around a given axis of rotation. The robot controls the slippage by varying the opening between the fingers in order to allow the tool to move to the desired angular position following a reference trajectory. We show experimentally how the proposed controller achieves convergence to the desired tool orientation under variations of the tool's inertial parameters.

39 citations

01 Jan 2000
TL;DR: This report describes a library of C routines for finding the relative pose of two calibrated perspective cameras given the images of five unknown 3D points.
Abstract: This report describes a library of C routines for finding the relative pose of two calibrated perspective cameras given the images of five unknown 3D points. The relative pose is the translational and rotational displacement between the two camera frames,also called camera motion and relative orientation.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202339
202282
2021106
2020164
2019224
2018212