Results 271 to 280 of about 6,830,142 (327)
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High accuracy Fourier transform fringe pattern analysis
Optics and Lasers in Engineering, 1991Abstract The principle of the Fourier transform method of fringe pattern analysis is described with emphasis on the refinements for high accuracy measurements. Characteristics of the main sources of errors of the retrieved phase in respect to the interferogram features and the modified software procedure are given.
M. Kujawinska, J. Wójciak
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Desirable accuracies in instrument transformers
Electrical Engineering, 1931Errors in both the producer's total meter registrations and the consumer's single meter registration are analyzed and evaluated by the “probable error” method. Accuracies better than 0.5 per cent are shown to be valueless from a practical standpoint.
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Electrical accuracy of Selsyn generator — Control transformer system
Electrical Engineering, 1946THE military requirements for high accuracy position control systems have placed emphasis on the need for a voltage signal source which can indicate electrically a mechanical shaft position. In addition this signal source must have high accuracy, marked dependability, and the capability of continuous mechanical rotation.
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On-Line Evaluation of Voltage Transformer Accuracy
Advanced Materials Research, 2012The accuracy of voltage and current transformer (VT and CT) is a key factor in electric power metering. Ratio error and phase displacement calibration of VT and CT is traditionally carried out off-line. As a result of the expansion of the power grid and the increasing metering quality requirements from customer side, the off-line metering of VT and CT ...
Xiao Hui Yang +3 more
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IEEE Transactions on Reliability
A novel method for positioning accuracy analysis based on non-probabilistic time-dependent reliability is proposed for industrial robots with multisource uncertainties. To overcome the limitation of the probabilistic method in analyzing fewer samples, in
Chen Yang, Wanze Lu, Yuanqing Xia
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A novel method for positioning accuracy analysis based on non-probabilistic time-dependent reliability is proposed for industrial robots with multisource uncertainties. To overcome the limitation of the probabilistic method in analyzing fewer samples, in
Chen Yang, Wanze Lu, Yuanqing Xia
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Accuracy Enhancement for Hilbert Transform Network Analyzers
29th European Microwave Conference, 1999, 1999A technique is introduced suitable for using the Hilbert transform to design a homodyne vector network analyzer with only one sampling signal. In addition, methods to improve the accuracy of this already known technique are introduced. An example shows the achieved accuracy by using these suggestions, which can be implemented on every network analyzer ...
Thorsten Hauschild, Reinhard Knochel
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Effects of Facial Transformations on Accuracy of Recognition
The Journal of Social Psychology, 1994Alterations of facial features between the initial phase of a memory task and a later recognition test lower identification accuracy. The effects of leaving on, leaving off, adding, or removing targets' eyeglasses or beards on identification accuracy were examined in two experiments with American undergraduates.
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The transformer accuracy on-line evaluation system
2011 International Conference on Electrical and Control Engineering, 2011The accuracy of current transformer (CT) and voltage transformer (VT) is important guarantee of power system protection, monitoring and measurement. A new method based on live working technique for transformer accuracy evaluation is proposed in this paper.
Xie Kai, Yan Dong, Yang Xiao-Hui
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Improving classification accuracy using evolutionary fuzzy transformation
Proceedings of the 11th Annual Conference Companion on Genetic and Evolutionary Computation Conference: Late Breaking Papers, 2009Selection of a classifier is only one aspect of the problem of data classification. Equally important (if not, more so) is the pre-processing strategy to be employed. In this paper, a pre-processing step is proposed in order to increase accuracy of classification.
Hossein Moeinzadeh +3 more
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A New High Accuracy Current Transformer
Transactions of the American Institute of Electrical Engineers, 1929This paper is presented for the purpose of describing a new method of compensation, by the use of which the ratio and phase-angle errors of current transformers are materially reduced. There are several methods by which the ratio and phase-angle errors of current transformers may be reduced. The following are those which are most commonly used: 1.
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