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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, an exact and approximate kinematic analysis of a roller chain drive modeled as a four-bar mechanism is presented, where the span connects the sprockets such that they rotate in the same direction, and the sprocket size, number of teeth, and shaft center distance can be arbitrary.
24 citations
Patent•
26 Jan 1977
TL;DR: In this paper, an off-the-vehicle type of wheel-tire balancer for vehicular wheels is presented, where a wheel and tire assembly which is to be balanced is disposed on a rotating shaft under the control of a signal responsive electronic control apparatus utilizing rotational velocity signals, rotational, directional, and positional signals and velocity of displacement of the mounting apparatus for the shaft to provide suitably calibrated indicators.
Abstract: This invention is directed to an off-the-vehicle type of wheel-tire balancer for vehicular wheels. A wheel and tire assembly which is to be balanced is disposed on a rotating shaft under the control of a signal responsive electronic control apparatus utilizing rotational velocity signals, rotational, directional, and positional signals and velocity of displacement of the mounting apparatus for the shaft to provide a suitably calibrated indicators, the amount of weight to be added at certain angular positions on the inner and outer planes of the wheel rim to provide a dynamic balance of the wheel-tire system. Further indicators are provided for relating the indicated weight to be added to an angular position of the wheel and tire system. The entire apparatus is automatic in operation in that once the system is started, a motor is energized to rapidly rotate the wheel-tire system up to a predetermined rotational velocity. Once this is attained, the magnitude and angular disposition of the weights to be disposed on the rims of the wheel-tire system is rapidly detected over but a few revolutions of the shaft and following this, the motor is energized in a reverse direction to provide a dynamic breaking force to rapdily bring the wheel-tire system to a rest position, the energization of the motor in the reversed direction being maintained until the shaft is actually reversed its direction of rotation for a predetermined angular displacement.
24 citations
TL;DR: To improve the subdivision accuracy of the absolute photoelectric shaft encoder, a particle swarm optimization (PSO) algorithm is proposed for error correction and seven undetermined parameters in the signal model are identified using an optimization algorithm.
Abstract: To improve the subdivision accuracy of the absolute photoelectric shaft encoder, a particle swarm optimization (PSO) algorithm is proposed for error correction. The error is generated by the subdivision of the grating Moire fringe signal, and a Moire fringe photoelectric signal data acquisition system is built based on a digital signal processor. First, based on the principle of measuring the angular displacement with grating diffraction interference, a mathematical model for the Moire fringe photoelectric signal is established, and then the influence of signal deviation on the subdivision error is noted. Second, the compensation model of the signal subdivision error is established. Then, the PSO algorithm is introduced, and the inertial weight and speed factor in the algorithm are optimized. Seven undetermined parameters in the signal model are identified using an optimization algorithm. Finally, according to the subdivision error compensation model, the data processing system can automatically correct the subdivision error caused by the direct current (dc) offset, orthogonality error, and sinusoidal error. Taking the 23-bit photoelectric encoder as the experimental object, the actual static subdivision error can be reduced by at least 0.30–0.46”. In the encoder operation, if the correction preprocessing is performed on all the grating Moire signals, then the subdivision accuracy of the encoder can be improved, and its spatial adaptability and angular reliability will also be improved.
24 citations
25 Jul 1989
TL;DR: In this article, a dual measurement interferometer was developed specifically for wafer stage metrology, which concurrently measures both linear and angular displacement, and was designed to conserve space, minimize stage mass, eliminate heat sources and provide high resolution and slew rate.
Abstract: A dual measurement interferometer has been developed specifically for wafer stage metrology. The interferometer concurrently measures both linear and angular displacement. It is designed to conserve space, minimize stage mass, eliminate heat sources and provide high resolution and slew rate.
24 citations
02 Dec 2002
TL;DR: An approximate rigid body model for the insect body dynamics is developed so that attitude stabilization techniques for a flying robotic insect can be tested to illustrate the utility of these novel sensor architectures.
Abstract: Body rotation and orientation sensing mechanisms used by flying insects are introduced and their mathematical models are presented. The analysis and simulations of these models showed the feasibility of using such biologically inspired approaches to build biomimetic gyroscopes and angular position detectors. Further, an approximate rigid body model for the insect body dynamics is developed so that attitude stabilization techniques for a flying robotic insect can be tested to illustrate the utility of these novel sensor architectures. To the authors' knowledge, this is the first attempt in using output feedback from biomimetic devices such as ocelli and halters to achieve attitude stabilization.
24 citations