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 V-type ultrasonic rotary motor has been proposed to enable use in small precision machines, where a thin metal plate was used as a Vshaped vibrator and four ceramic plates were attached on the upper and bottom sides of the metal plate.
20 citations
Patent•
21 Oct 1997
TL;DR: In this paper, a pump or compressor wherein the volumetric displacement of a piston cylinder assembly is variable is described, where the piston is connected to a crank slider or eccentric mechanical drive, the crankshaft of which oscillates alternately clockwise through a controllably variable angle and counterclockwise through substantially the same angle.
Abstract: A pump or compressor wherein the volumetric displacement of a piston cylinder assembly is variable. The piston is connected to a crank slider or eccentric mechanical drive, the crankshaft of which oscillates alternately clockwise through a controllably variable angle θ and counterclockwise through substantially the same angle θ, the angle θ being measured from the angular position of the crankshaft or eccentric at which separation between piston and the closed end of the bore is a minimum (Top Dead Center). The angle of crank oscillation controls the degree of volumetric displacement of the piston. The crank shaft is connected to a torsional spring so as to substantially resonate the rotational inertia of the moving parts. An oscillating electric motor supplies the oscillating torque to drive the mechanism at constant frequency but controllably variable angular amplitude.
20 citations
Patent•
04 Sep 2009
TL;DR: In this paper, a scanning beam projection system (100) includes a scanning mirror (116) having a fast scan axis and a slow scan axis, which is controlled by a slow-scan scanning mirror control system (130).
Abstract: A scanning beam projection system (100) includes a scanning mirror (116) having a fast-scan axis and a slow-scan axis. Movement on the slow-scan axis is controlled by a slow-scan scanning mirror control system (130). The control system receives position information describing angular displacement of the mirror. An outer loop of the control system includes least mean square (LMS) tone adders that determine harmonically related signals that when combined produce a scanning mirror drive signal. An inner loop of the control system compensates for a scanning mirror resonant vibration mode at a frequency within the frequency band occupied by the harmonically related signals.
20 citations
Patent•
23 Nov 1987TL;DR: In this article, a high-precision angular position encoder for detecting the absolute angular position when the transmitter disc (GS) is standing still and the incremental angular position was proposed.
Abstract: In a high-precision angular position encoder for detecting the absolute angular position when the transmitter disc (GS) is standing still and the incremental angular position when the transmitter disc is rotating, the measurement signals (U1 to U4) obtained by photoelectric scanning of a group of tracks (S1 to S4) arranged on the transmitter disc are triangular functions of the angle of rotation. During the rotation of the transmitter disc by the angular range (WBS1) corresponding to one period (U1P1) of one of the measurement signals (U1), an integral multiple (10) of periods occurs in the measurement signal (U2) belonging to another track (S2). The sums of periods occurring in the individual measurement signals (U1 to U4) during a complete rotation (360 DEG ) of the transmitter disc are thus graded with respect to one another (1:10:10:10). The absolute angular position can be determined by means of progressive evaluation of the measurement signals of the individual tracks (S1 to S4) with higher precision than is possible in the case of the incremental angular position by evaluating one of the tracks (S4) of the group.
20 citations
TL;DR: In this article, equations of motion of a closed-type manipulator, whose mechanism can easily be made lighter, are derived in consideration of the characteristics of the driving source.
Abstract: In this article, equations of motion of a closed-type manipulator, whose mechanism can easily be made lighter, are derived in consideration of the characteristics of the driving source. Considering the final condition of angular displacement and angular velocity in throwing motion, trajectories of velocity for saving energy are calculated by iterative dynamic programming, and the dynamic characteristics of manipulator control based on the trajectory for saving energy are analyzed theoretically and investigated experimentally.
20 citations