Title: Interface reduction of flexible bodies for efficient modeling of body flexibility in multibody dynamics
Authors: Heirman, Gert ×
Desmet, Wim #
Issue Date: 1-Aug-2010
Publisher: Kluwer Academic Publishers
Series Title: Multibody System Dynamics vol:24 issue:2 pages:219-234
Abstract: The floating frame of reference techniques is an established technique to incorporate
flexibility in multibody models. The model dimension of the body flexibility models
can be reduced by model reduction techniques such as Component Mode Synthesis (CMS)
or Krylov subspace-based techniques, but the efficiency of these techniques is limited by the
number of interface nodes in which the flexible body is or can be loaded. A common
solution to this problem is condensing the different nodes of a given interface surface
into a single node, which represents the net motion of the interface surface. Commercial
finite element packages offer two modeling techniques to condense interface surfaces: rigid
multipoint constraints and interpolation multipoint constraints. Rigid multipoint constraints
will typically result in stiffness overestimation, whereas interpolation multipoint constraints
will lead to an underestimation. Which approximation of both is most suitable depends on
the application. However, the default definition of interpolation multipoint constraints does
not allow generation of reduced body flexibility models for multibody models. This paper
gives a theoretical background of the problem cause, and offers a practical solution. The two
modeling techniques result in significantly different approximations of the body flexibility
dynamics, as is shown in a numerical example.
ISSN: 1384-5640
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Production Engineering, Machine Design and Automation (PMA) Section
× corresponding author
# (joint) last author

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