A new method for computational electromagnetics, the theory and numerical method of rotational operator

2002 ◽  
Author(s):  
Song Wen-Miao ◽  
Zhang Xiao-Juan ◽  
Xu Cheng ◽  
Xing Feng
Keyword(s):  
Numerical Method ◽  
Computational Electromagnetics ◽  
New Method ◽  
Rotational Operator

scholarly journals A New Method for the Calculation of Energy and Power Requirements of Bucket Wheel Excavators

2019 ◽  
Vol 10 (1) ◽  
pp. 15-20
Author(s):  
József András ◽  
József Kovács ◽  
Endre András ◽  
Ildikó Kertész ◽  
Ovidiu Bogdan Tomus
Keyword(s):  
Energy Consumption ◽  
Numerical Method ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
New Method ◽  
Energy Requirements ◽  
Belt Conveyor ◽  
Analytical Formulas ◽  
Power And Energy ◽  
Continuous Working

Abstract The bucket wheel excavator (BWE) is a continuous working rock harvesting device which removes the rock by means of buckets armoured with teeth, mounted on the wheel and which transfers rock on a main hauling system (generally a belt conveyor). The wheel rotates in a vertical plane and swings in the horizontal plane and raised / descended in the vertical plane by a boom. In this paper we propose a graphical-numerical method in order to calculate the power and energy requirements of the main harvesting structure (the bucket wheel) of the BWE. This approach - based on virtual models of the main working units of bucket wheel excavators and their working processes - is more convenient than those based on analytical formulas and simplification hypotheses, and leads to improved operation, reduced energy consumption, increased productivity and optimal use of available actuating power.

A new method of determining the transport coefficients for high pressure arcs from experimental data

1969 ◽  
Vol 3 (2) ◽  
pp. 269-280 ◽  
Author(s):  
L. B. Kapp ◽  
P. H. Richards
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Computer Program ◽  
Numerical Method ◽  
Temperature Profile ◽  
Transport Coefficients ◽  
New Method ◽  
Radial Temperature ◽  
Current Voltage ◽  
Current Voltage Characteristics

The problem is to determine the electrical and thermal conductivities of high pressure are plasmas from measurements of the current—voltage characteristics of the are and a single radial temperature profile. A new numerical method is described together with the corresponding computer program. The latter is applied to some recent measurements on wall-stabilized nitrogen ares, covering the temperature range 4500—11,000 °K, for which radiation can be neglected, and the results are compared with those of other workers.

A New Method of Designing Underwater Towed System

2011 ◽  
Vol 66-68 ◽  
pp. 1251-1255 ◽  
Author(s):  
Da Kui Feng ◽  
Wei Wen Zhao ◽  
Wu Bo Pei ◽  
Ya Cheng Ma
Keyword(s):  
Numerical Method ◽  
Governing Equation ◽  
Hydrodynamic Model ◽  
Basic Problem ◽  
New Method ◽  
Euler Angles ◽  
Towed Cable

A hydrodynamic model of towed system is studied. The model of towed cable in this paper is based on the Ablow and Schechter method. A basic problem in the design of towed system is presented by the choice of Euler angles and tension at ending point of cable. This paper proposes a new way to design an ideal towed system. And a code is written to assist in designing the towed system. The governing equation is solved using a 4th-order Runger-Kutta numerical method for stable cable. The computed results with the code are close to the measured ones.

scholarly journals A Numerical Method for Preserving Curve Edges in Nonlinear Anisotropic Smoothing

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Shaoxiang Hu ◽  
Zhiwu Liao ◽  
Dan Sun ◽  
Wufan Chen
Keyword(s):  
Numerical Method ◽  
Anisotropic Diffusion ◽  
Digital Images ◽  
New Method ◽  
Image Smoothing ◽  
Time And Space ◽  
Curve Edge ◽  
Nonlinear Anisotropic Diffusion ◽  
Anisotropic Smoothing

We focus on nonlinearity for images and propose a new method which can preserve curve edges in image smoothing using nonlinear anisotropic diffusion (NAD). Unlike existing methods which diffuse only among the spatial variants, the new method suggests that the diffusion should be performed both among the time variants and spatial variants, named time and space nonlinear anisotropic diffusion (TSNAD). That is, not only the differences of the spatial variants should be estimated by the nearby spatial points but also the differences of the time variants should be approximated by the weighted time differences of nearby points, according to the differences of gray levels between them and the consideration point. Since the time differences of nearby points using NAD can find more points with similar gray levels which form a curve belt for the center pixel on a curve edge, TSNAD can provide satisfied smoothing results while preserving curve edges. The experiments for digital images also show us the ability of TSNAD to preserve curve edges.

scholarly journals NUMERICAL METHOD FOR THE SOLUTION OF INVERSE PROBLEMS GENERATED BY PERTURBATIONS OF SELF-ADJOINT OPERATORS BY METHOD OF REGULARIZED TRACES

2017 ◽  
Vol 19 (6) ◽  
pp. 23-30
Author(s):  
S.I. Kadchenko
Keyword(s):  
Inverse Problems ◽  
Numerical Method ◽  
Computational Efficiency ◽  
Spectral Characteristics ◽  
New Method ◽  
Sturm Liouville ◽  
Adjoint Operators

In the article a new method for the solution of inverse problems generated by perturbations of self-adjoint operators on their spectral characteristics is developed. The method was tested on inverse problems for Sturm-Liouville problems. The results of numerous calculations showed the computational efficiency of the method.

scholarly journals A new method for solving interval and fuzzy quadratic equations of dual form

2021 ◽  
Vol 5 (2) ◽  
pp. 81-89
Author(s):  
Kamal Mamehrashi
Keyword(s):  
Numerical Method ◽  
Fuzzy Number ◽  
Quadratic Equation ◽  
New Method ◽  
Numerical Examples ◽  
Quadratic Equations ◽  
Dual Form ◽  
Interval Extension

In this paper, we present a numerical method for solving a quadratic interval equation in its dual form. The method is based on the generalized procedure of interval extension called” interval extended zero” method. It is shown that the solution of interval quadratic equation based on the proposed method may be naturally treated as a fuzzy number. An important advantage of the proposed method is that it substantially decreases the excess width defect. Several numerical examples are included to demonstrate the applicability and validity of the proposed method.

scholarly journals A new method for numerical solution of checkerboard fields

2001 ◽  
Vol 1 (4) ◽  
pp. 157-173 ◽  
Author(s):  
Stein A. Berggren ◽  
Dag Lukkassen ◽  
Annette Meidell ◽  
Leon Simula
Keyword(s):  
Numerical Solution ◽  
Numerical Method ◽  
New Method ◽  
Numerical Treatment

We consider a generalized version of the standard checkerboard and discuss the difficulties of finding the corresponding field by standard numerical treatment. A new numerical method is presented which converges independently of the local conductivities.

scholarly journals A New High-Order Stable Numerical Method for Matrix Inversion

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
F. Khaksar Haghani ◽  
F. Soleymani
Keyword(s):  
Iterative Method ◽  
Numerical Method ◽  
Matrix Inversion ◽  
High Order ◽  
New Method ◽  
Order Convergence ◽  
Initial Value ◽  
Numerical Examples ◽  
Stable Numerical Method

A stable numerical method is proposed for matrix inversion. The new method is accompanied by theoretical proof to illustrate twelfth-order convergence. A discussion of how to achieve the convergence using an appropriate initial value is presented. The application of the new scheme for finding Moore-Penrose inverse will also be pointed out analytically. The efficiency of the contributed iterative method is clarified on solving some numerical examples.

scholarly journals NEW METHOD TO CALCULATE THE ENERGY AND FRACTAL DIMENSION OF THE DAILY ELECTRICAL LOAD

Fractals ◽  
2020 ◽  
Vol 28 (06) ◽  
pp. 2050135
Author(s):  
HECTOR A. TABARES-OSPINA ◽  
FABIOLA ANGULO ◽  
MAURICIO OSORIO
Keyword(s):  
Fractal Dimension ◽  
Numerical Method ◽  
The Other ◽  
New Method ◽  
Electrical Load ◽  
Load Curve ◽  
Box Counting ◽  
Theoretical Approaches ◽  
The Subject

This paper proposes a method to calculate the degree of fluctuation of the daily electrical load-curve using fractal dimension, which is a quantitative estimator of spatial complexity. The conventional methods for forecasting have not studied such a variable, being a new parameter that can be included to characterize the electrical load. The method of fractal dimension also allows us to propose a new numerical method to calculate the integral of a function, using the trapezoid rule, but splitting the curve with fractal segments, to discover other observations, which allows the elevation of new theoretical approaches. The results are compared with the other methods such as the conventional trapezoid rule and the box-counting. It is then a new contribution that expands the universal knowledge on the subject. The case study is the daily electrical load-curve, where the energy demanded corresponds to the area of the [Formula: see text] region bounded by the curve.

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