Abstract
A method of reducing the system matrices of a planar flexible beam described by an absolute nodal coordinate formulation (ANCF) is presented. In this method, we focus that the bending stiffness matrix expressed by adopting a continuum mechanics approach to the ANCF beam element is constant when the axial strain is not very large. This feature allows to apply the Craig–Bampton method to the equation of motion that is composed of the independent coordinates when the constraint forces are eliminated. Four numerical examples that compare the proposed method and the conventional ANCF are demonstrated to verify the performance and accuracy of the proposed method. From these examples, it is verified that the proposed method can describe the large deformation effects such as dynamic stiffening due to the centrifugal force, as well as the conventional ANCF does. The use of this method also reduces the computing time, while maintaining an acceptable degree of accuracy for the expression characteristics of the conventional ANCF when the modal truncation number is adequately employed. This reduction in CPU time particularly pronounced in the case of a large element number and small modal truncation number; the reduction can be verified not only in the case of small deformation but also in the case of a fair bit large deformation.
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Abbreviations
- A :
-
cross-sectional area of beam
- B :
-
velocity transformation matrix
- C :
-
constraint equation
- e :
-
nodal coordinate vector
- E :
-
Young’s modulus of beam
- I :
-
second moment of area of beam
- K :
-
stiffness matrix
- l :
-
beam length
- M :
-
mass matrix
- m c :
-
number of constraint equation
- n b :
-
number of degrees of freedom of the boundary region in a component
- n c :
-
number of normal modes
- n e :
-
number of elements in a component
- n i :
-
number of degrees of freedom of interior region in a component with n e elements
- n t :
-
number of truncation modes
- n r :
-
number of degrees of freedom of the reduced component
- q :
-
generalized coordinate vector
- x :
-
local coordinate of element in undeformed configuration
- ρ :
-
density of beam element
- ξ :
-
modal coordinate vector of normal modes
- \(\varOmega _{m}^{2}\) :
-
eigen value of mth normal mode
- subscript b,i :
-
boundary and interior regions of beam element
- subscript dp, in :
-
related to dependent and independent coordinates
- subscript l :
-
related to axial direction of beam element
- subscript m :
-
the mode number
- subscript t :
-
related to bending of beam element
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Kobayashi, N., Wago, T. & Sugawara, Y. Reduction of system matrices of planar beam in ANCF by component mode synthesis method. Multibody Syst Dyn 26, 265–281 (2011). https://doi.org/10.1007/s11044-011-9259-6
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DOI: https://doi.org/10.1007/s11044-011-9259-6