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.

Wireless transmission torque wrench with angular orientation correction

Abstract: Disclosed is a torque wrench with wireless transmission function, including at least one wrench body having an end to which a tool head is coupled for coupling with a tool piece, such as wrench socket, for application of torque, at least one toque-strain bar, which is coupled to the tool head of the wrench body, at least one torque sensor, which is mounted to the toque-strain bar to detect the value of the torque transmitted to the toque-strain bar, at least one angular position sensor, which is set inside the wrench body to detect a horizontal angle of the body and the tool head, at least one detection and processing circuit, which is arranged in the wrench body and connected to the torque sensor and the angular position sensor to convert detected torque and angle into digital torque and angle data for displaying or issuing an alarm and to transmit the torque and angle data in a bi-directional wireless manner, and at least one control receiver, which receives the torque and angle data from the detection and processing circuit for subsequent applications.

A Dynamic, Hardware-in-the-Loop, Three-Axis Simulator of Spacecraft Attitude Maneuvering with Nanosatellite Dimensions

Abstract: This paper presents the design and development of a nanosatellite-scale spacecraft three-axis simulator (“CubeSat Three-Axis Simulator,” or “CubeTAS”), the purpose of which is to enable experimental testing of Attitude Determination and Control Systems (ADCS) and methods for nanosatellites. The CubeTAS test-bed consists of a hollow hemispherical structure containing typical ADCS components of a three-axis stabilized spacecraft, including the following items: three flight-grade reaction wheels, a sun sensor, an inertial measurement unit, three custom-made magneto-torquer coils, an on-board computer, and a battery. The hemispherical structure and its content float over an air-bearing cup; this enables quasi-frictionless rotation in three degrees of freedom over a large angular displacement. A custom-made automatic balancing system enables micron-level-accurate coincidence of the center of mass and the center of rotation of the floating system, allowing the achievement of a quasi-torque-free rotation. An offboard, high-accuracy rotational metrology system and an off-board set of three large Helmholtz coils complete the test-bed.

Angular position adjusting device

Abstract: An angular position adjusting device including a first member which holds an object having an axis of rotation, a second member which holds the first member rotatably about the axis of the object, and a rotating mechanism interposed between the first and second members and operable to rotate the first member relative to the second member about the axis of the object, and wherein one of the first and second members has an guiding surface formed to extend along an arc of a circle having a center at the axis of the object, the arc having a center angle smaller than 180°, and the other of the first and second members has a guided surface for sliding contact with the arcuate guiding surface, when the first member is rotated by the rotating mechanism relative to the second member, to adjust the angular position of the object about its axis.

Apparatuses and methods for magnetometer alignment calibration without prior knowledge of the local magnetic

Abstract: Apparatuses and methods calibrate attitude dependent magnetometer alignment parameters of a magnetometer mounted together with other angular position sensors on a device without prior knowledge of the local magnetic field and allowing a constant but unknown offset of the yaw angle in the reference attitudes with respect to an earth-fixed coordinate system. The method includes acquiring magnetic field measurements from the magnetometer and corresponding estimated angular positions subject to an unknown yaw offset relative to a gravitational reference system. The method further includes iteratively computing a scale and vector components of a quaternion representing a misalignment matrix, an inclination angle of local magnetic field, and a yaw angle offset, using an extended Kalman filter (EKF) infrastructure with a specific designed model and constraints, based on the magnetic field measurements and the corresponding estimated angular positions.

Pulse width modulation based digital incremental encoder

Abstract: A digital incremental encoder for generating an output signal indicative of an angular position, a direction of rotation, and a speed of rotation of a shaft. A counter receives a PWM signal indicative of the angular position of the shaft and a clock signal from an angular position sensor, and generates a multi-bit output. A latch latches the multi-bit output, a first bit and a second bit of which are used to generate the output signals that include the first bit. The first bit and the second bit may be XOR'd together to generate an XOR output included in the output signals. A direction of rotation may be derived from a quadrature phase relationship between the first bit and the XOR output. The angular position sensor may be an NCAPS or MT-NCAPS. A linear position sensor may be used instead of an angular position sensor to generate the PWM signal.