نتایج جستجو برای: dynamic harmonic domain

تعداد نتایج: 836324  

Journal: :Computer Methods in Applied Mechanics and Engineering 2022

The calculation of high-frequency wave radiation in exterior domains by finite element methods can lead to large computations. In this paper, it is shown that the solution domain be decomposed as a series expansion functions with an analytical part made from product harmonic waves and polynomials scaled variable numerical approximation vector. or scattering problem found solving sparse linear s...

2017
J. H. BONSEL R. H. B. FEY H. NIJMEIJER

This paper deals with the application of a linear dynamic vibration absorber (DVA) to a piecewise linear beam system to suppress its first harmonic resonance. Both the undamped and the damped DVAs are considered. Results of experiments and simulations are presented and show good resemblance. It appears that the undamped DVA is able to suppress the harmonic resonance, while simultaneously many s...

The safe operation of power system depends on its stability and security supply in all times. The dynamic instability (small signal instability) is one of phenomena that results in power system instability and has been discussed as a challenge in power system control and operation from a long time ago. Commonly the dynamic instability appears as undamped low frequency electromechanical oscillat...

2000
Jianghai Xia Richard D. Miller

A unique filtering approach designed to eliminating power-line noise on shallow seismic data without affecting the frequency content of signal provides a powerful harmonic noise suppression tool for data acquired with modern large dynamic range recording systems. Amplitudes and phases of sinusoids (functions of power-line noise) present before the first arrivals can be estimated using the Leven...

Journal: :iranian journal of mathematical chemistry 2015
m. a. iranmanesh m. saheli

the harmonic index h(g) , of a graph g is defined as the sum of weights 2/(deg(u)+deg(v)) of all edges in e(g), where deg (u) denotes the degree of a vertex u in v(g). in this paper we define the harmonic polynomial of g. we present explicit formula for the values of harmonic polynomial for several families of specific graphs and we find the lower and upper bound for harmonic index in caterpill...

Journal: :Physics in medicine and biology 2006
Eunyoung Park Antoinette M Maniatty

This paper presents a direct inversion approach for reconstructing the elastic shear modulus in soft tissue from dynamic measurements of the interior displacement field during time harmonic excitation. The tissue is assumed to obey the equations of nearly incompressible, linear, isotropic elasto-dynamics in harmonic motion. A finite element discretization of the governing equations is used as a...

Journal: :Journal of the Magnetics Society of Japan 1999

Journal: :IEEE Transactions on Power Electronics 2018

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