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Analiza modalna obrabiarki KCI 210/280 NM z zastosowaniem hybrydowej metody elementów skończonych

Grzywocz J., Sokołowski A.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

2014

nr 1

55--62

W artykule przedstawiono koncepcję hybrydowej metody elementów skończonych wykorzystującą interfejs ANSYS-ADAMS. Badanym obiektem jest obrabiarka wielkogabarytowa KCI 210/280 NM. W badaniach dyskretyzowano poszczególne zespoły obrabiarek jako odkształcalne (podatne) i sztywne oraz nadano odpowiednie więzy w postaci elementów sprężysto - tłumiących. Do wyznaczania współczynników sztywności i tłumienia elementów EST wykorzystano autorską aplikację "KBM-HMES". Wyniki uzyskane hybrydową metodą elementów skończonych HMES porównano z klasyczną metodą MES.

The paper presents the implementation of hybrid finite element method using the ANSYS - ADAMS Interface. KCI 210/280 NM machine tool served as a tested object. In the presented studies, several variants were analyzed. The variants differ in number and type of machine tool parts considered as deformable or rigid. In order to impose proper constraints between these parts, elastic - damping elements (EST) were applied. For the determination of stiffness and damping of EST elements original application "KBM-HMES" has been implemented. The obtained results of the hybrid finite element method were compared to the results obtained with the classical FEM method.

A new hybrid finite element approach for three-dimensional elastic problems

Cao C., Qin Q. H., Yu A.

Archives of Mechanics

2012

Vol. 64, nr 3

261-261

A new fundamental solution based finite element method (HFS-FEM) is presented for analyzing three-dimensional (3D) elastic problems with body forces in this paper. It begins with deriving formulations of 3D HFS-FEM for elastic problems without body force and then the body force term is handled by means of the method of particular solution and radial basis function approximation. In our analysis, the homogeneous solution is obtained using the proposed HFS-FEM and the particular solution associated with the body force is approximated by radial basis functions. Several standard tests and numerical examples are considered to assess the capability and performance of the proposed method and elements. It is found that, comparing with conventional FEM (ABAQUS), the proposed method can achieve higher accuracy and efficiency when same element meshes are used. It is also found that the elements associated with this method are not very sensitive to mesh distortion and can be employed for problems involving nearly incompressible materials. This new method seems to be promising to deal with problems involving generalized body force, complex geometry, stress concentration and multi-materials.