Temat: transformacja afiniczna - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Hamiltonian model of electromechanical actuator in natural reference frame.: Part I: Topology-based approximation algorithm
Autorzy:: Burlikowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/140394.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: równania Hamiltona
simpleks
kompleks symplicjalny
aproksymacja symplicjalna
transformacja afiniczna
Hamiltonian equations
simplex
simplical complex
simplical approximation
affine transformation
Opis:: In the paper a novel mathematical model of electromechanical actuator is presented. It is based on application of Hamiltonian equations in the description of electromechanical energy conversion. It results in employment of flux linkages as state variables in the state space equations. For simplicity only a 3-phase wye connected stator winding without a neutral wire is considered in detail. The procedure can be generalised to any number of phases. Topology-based approach is used in the model implementation. Procedures for evaluation of all quantities (currents, energy/coenergy, electromagnetic torque) present in model equations are described. Eddy currents and hysteresis phenolmenon are neglected in formulation of the model to enable application of state-space description.
Źródło:: Archives of Electrical Engineering; 2011, 60, 3; 317-330
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A method for local approximation of a planar deformation field
Autorzy:: Ligas, Marcin
Banaś, Marek
Szafarczyk, Anna
Powiązania:: https://bibliotekanauki.pl/articles/106795.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:: deformation analysis
polar decomposition
affine transformation
rotation matrix
stretch tensor
analiza deformacji
rozkład biegunowy operatora
transformacja afiniczna
macierz obrotu
Opis:: We present a method of approximation of a deformation eld based on the local ane transformations constructed based on n nearest neighbors with respect to points of adopted grid. The local ane transformations are weighted by means of inverse distance squared between each grid point and observed points (nearest neighbors). This work uses a deformation gradient, although it is possible to use a displacement gradient instead – the two approaches are equivalent. To decompose the deformation gradient into components related to rigid motions (rotations, translations are excluded from the deformation gradient through dierentiation process) and deformations, we used a polar decomposition and decomposition into a sum of symmetric and an anti-symmetric matrices (tensors). We discuss the results from both decompositions. Calibration of a local ane transformations model (i.e., number of nearest neighbors) is performed on observed points and is carried out in a cross-validation procedure. Verication of the method was conducted on simulated data-grids subjected to known (functionally generated) deformations, hence, known in every point of a study area.
Źródło:: Reports on Geodesy and Geoinformatics; 2019, 108; 1-8
2391-8365
2391-8152
Pojawia się w:: Reports on Geodesy and Geoinformatics
Dostawca treści:: Biblioteka Nauki

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