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.

Pressure sensing instrument for aircraft.

Abstract: The invention comprises an improved sensing instrument (10) for sensing the angular position of the longitudinal axis (17) of a cylindrical sensor body (14) of an object moving relative to a fluid medium with respect to a first plane. Such object has a leading end portion (15) joined to the sensor body (14) and exposed to the fluid medium. A first pair of pressure sensing ports (20 and 21) are on the object and face in the upstream direction and have their axes lying in a second plane at right angles to said first plane and disposed at predetermined angles with respect to the axis (17) of the object. A second pair of pressure sensing ports (22 and 23) on the object have their axes lying in the first plane, such axes being disposed at predetermined angles with respect to the axis (17) of the object. A single pressure port (16) on the object has an axis coinciding with the axis (17) of the object. The improvement comprises the leading end portion ( 15) of the sensor body (14) defining a spherical segment of one base.

Angular position sensor

Abstract: An angular position sensor having high angular resolution and which provides an immediate indication of the angular position being measured upon the application of power to the position sensor is disclosed. A quadrature disk having a continuous notch or recess in the outer periphery thereof is rotatable with respect to quadrature sensors positioned in a spaced-apart relationship with respect to one another. Differing radii on the quadrature disk cause the actuation and deactuation of the quadrature sensors as the disk passes thereunder producing sharply defined output signal transitions. While this is occurring, the Hall-effect sensor produces a sine wave output. The orientation of the quadrature disk with respect to the quadrature sensors is such that the output signal transitions produced by the quadrature sensors correspond with the maximum and minimum values of the sine wave produced by the Hall-effect sensor. The resulting rotation and quadrant data from the quadrature sensors and the Hall-effect sensor are applied as inputs to a microprocessor where a determination of the angular orientation of the member connected to the angular position sensor is made with respect to any arbitrary reference point.

Apparent rotation in three-dimensional space: effects of temporal, spatial, and structural factors.

Abstract: Several experiments were performed in an effort to determine the different combinations of display parameters that can reliably elicit a perceptually compelling impression of a solid object rotating rigidly in three-dimensional space. All of the displays were computer-generated simulations of rigid objects rotating in depth under parallel projection. The parameters investigated included the number of frames in the apparent motion sequence, the temporal and spatial displacements between frames, the number of elements in the depicted object, and the structural organization of those elements. The results indicated that there are large interactions among these different parameters in their effects on the perception of structure from motion.