Results 181 to 190 of about 14,126,514 (213)

Development of Fault Diagnosis Model for Sucker Rod Pump Using Motor Power Curve

2021 XVIII International Scientific Technical Conference Alternating Current Electric Drives (ACED), 2021
A real time diagnostic system development for detecting sucker rod pump working conditions is current demand for most oil producers because of significant expenses related to costs of labor and consequent damages when a fault is not identified timely.
Samuel Isaac Tecle, Anatolii Ziuzev, Vladmir Spiridonov   +2 more
openaire   +1 more source

Nonlinear bending-torsion model for curved rods with little regularity

Mathematics and Mechanics of Solids, 2015
In this paper we extend the formulation of the equilibrium problem for the nonlinear bending-torsion theory for curved rods on rods with rectifiable middle curve. We also prove the existence of solutions for the associated boundary value problem when the middle curve is piecewisely smooth.
Kosor, Mate, Tambača, Josip
openaire   +2 more sources

Derivation of the model of elastic curved rods from three-dimensional micropolar elasticity

Annali dellNULLUniversità di Ferrara. Sezione 7: Scienze matematiche, 2007
In this paper we derive a model of curved elastic rods from the three-dimensional linearized micropolar elasticity. Derivation is based on the asymptotic expansion method with respect to the thickness of the rod. The method is used without any a priori assumption on the scaling of the unknowns.
Aganović, Ibrahim, Tutek, Zvonimir
openaire   +4 more sources

A general asymptotic model for Lipschitzian curved rods

2004
In this paper we show that the asymptotic methods provide an advantageous approach to obtain models of thin elastic bodies under minimal regularity assumptions on the geometry. Our investigation is devoted to clamped curved rods with a nonsmooth line of centroids and the obtained model is a generalization of results already available in the literature.
Tiba, Dan, Vodák, Rostislav
openaire   +1 more source

A Model of Irregular Curved Rods

2002
In this paper we derive a model of curved elastic rods with a piecewise smooth middle curve from the model of curved rods with smooth middle curves. The obtained model is the same as the model of junction of two straight rods derived directly from the three--dimensional linearized elasticity.
openaire   +1 more source

Evolution model of curved rods

2000
Predmet ovog rada je izvod i opravdanje jednodimenzionalnih modela u teoriji elastičnosti. Promatramo problem gibanja tankog lineariziranog elastičnog zakrivljenog štapa, te pripadnu svojstvenu zadaću. Rad je sastavljen iz tri poglavlja. U prvom poglavlju donosimo osnovne rezultate dobivene za problem ravnoteže lineariziranog elastičnog zakrivljenog ...
Tutek, Zvonimir, Tambača, Josip
openaire   +1 more source

A specific rod model based efficient analysis and design of hanger installation for self-anchored suspension bridges with 3D curved cables

Engineering Structures, 2016
Abstract Hanger installation is important in constructing self-anchored suspension bridges. The installation plan is obtained from comparative studies of concerned information in tentative construction steps. The comparisons are generally performed manually using detailed nonlinear finite element method (NFEM), particularly for those with 3D curved ...
Yuan Sun, Dong XU, Hong-Ping Zhu
exaly   +2 more sources

On Bifurcations of Equilibria of Intrinsically Curved, Electrically Charged, Rod-like Structures that Model DNA Molecules in Solution

Journal of Elasticity, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Biton, Yoav Y., Coleman, Bernard D., Swigon, David   +2 more
openaire   +1 more source

A XY Spin Chain Models on Space Curves and Analogy with Kirchhoff Rods

2007
A XY Heisenberg spin chain model with two perpendicular spins par site is mapped onto a Kirchhoff thin elastic rod. It is shown that in the case of constant curvature the Euler—Lagrange equation leads to the static sine-Gordon equation. The case of a double-helical DNA-like configuration corresponds to two interacting Heisenberg spin chains and the ...
Georgi G. Grahovski, Rossen Dandoloff
openaire   +1 more source

An asymptotic non-linear model for thin-walled rods with strongly curved open cross-section

International Journal of Non-Linear Mechanics, 2006
Abstract In this paper, we present a non-linear one-dimensional model for thin-walled rods with open strongly curved cross-section, obtained by asymptotic methods. A dimensional analysis of the non-linear three-dimensional equilibrium equations lets appear dimensionless numbers which reflect the geometry of the structure and the level of applied ...
A. Hamdouni, O. Millet
openaire   +1 more source