Component mode synthesis with constant mass and stiffness
Jul 4, 2007 ... In flexible multibody systems, component mode synthesis is used to ... and constant mass matrices combined with an FFRF description of the ...
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Download as a PDF - CiteSeerX
tion is based on a co-rotated constant mass and stiffness matrix that is factorized ... of this method, the component mode synthesis (CMS) method is applied to.
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Component Mode Synthesis for Efficient Structure-acoustic
Institute of Applied and Experimental Mechanics, University of Stuttgart. Pfaffenwaldring 9 ... Mass matrix, stiffness matrix, acoustic–structure coupling matrix. R ... repeatedly built into the overall plant, it is obvious that a component mode synthesis (CMS) approach is favorable for flexible ..... an almost constant level of 0 dB.
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A New Efficient Matrix Algorithm for a 3D Component Mode
ficient algorithm for a three-dimensional Component Mode Synthesis model to be used on sound ... wise, the application of the 'limp' mass description is not entirely appropriate in .... tween components is only in the constant plane x= 0. ..... quantities representing the modal mass, stiffness and damping matrices for the fluid.
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craig-bampton method - Vibrationdata
Oct 6, 2000 ... 3.5 Application of the Craig-Bampton Method to Modal ... Modal synthesis in which the models of, two or more ... mass and stiffness matrices that characterize the structure. The .... [B] is just the matrix of 6 rigid body modes at the boundary ..... interface transients are applied to the component models rather.
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The application of component mode synthesis for the dynamic
The application of component mode synthesis for the dynamic analysis of ... Component modes and mass and stiffness matrices can be computed using the ..... the blades are represented as rectangular bars of constant cross section with the ...
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Component mode synthesis techniques for finite element model
1. Introduction. Structural model updating methods (e.g. [1–3]) are used to rec- ... Specifically, component mode synthesis (CMS) techniques [30–. 32] are widely ... tions of the structural mass and stiffness matrix and the matrix of eigenvectors ..... where M0, K0, M,j and K,j, j = 1,... ,Nh, are constant matrices inde- pendent of h.
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A General Mixed Boundary Model Reduction Method for Component
A classic issue in component mode synthesis (CMS) methods is the choice for fixed or free ... Finally, the method is applied to a finite element test model. Analysis ... Here M(s) denotes the substructure's mass matrix, K(s) is the stiffness matrix, u(s) the vector ..... is some constant that can be chosen to suit the problem at hand.
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Mass Matrix Templates: General Description
Component Mode Synthesis: model reduction framework for structural dynamics. CMT ... Constant optical branch: OB frequency is independent of wavenumber. COF ... So far used to construct stiffness and mass matrices of linear FEM models.
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CMS methods in complete NVH analysis
Component Mode Synthesis is commonly used at Volvo Cars. The benefit ..... mass matrix, [C] is the damping matrix, [K] is the stiffness matrix and 1xl is the set of nodal or ..... as been kept constant, i.e. modes up to 3000Hz has been retained .
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L Gaul " CMS methods for efficient damping prediction for structures
Component Mode Synthesis (CMS) methods reduce the complexity of structural dynamics .... Then, the common reduction base Θ is applied to the mass and stiffness matrices, i.e. .... an exponential window of 1 s time constant is applied.
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18 Dynamic Substructuring, Component Mode Synthesis - Springer
The component mode synthesis method can also be applied on components for which ..... dynamic properties are described by their mass and stiffness matrices.
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Modeling and Simulation of Variable Mass, Flexible Structures
However, for variable mass systems, component and system modes vary ... shape functions are held constant and operate on the changing mass and stiffness matrices of ... These forces are used to excite an integrated flexible vehicle, slosh, and ..... This method, also known as Component Mode Synthesis, is described in ...
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Substructure Synthesis Methods and Their Application to Structural
5.1 Example rotor/stator structure for component mode synthesis exam ple . .... r = modal constant s = linear spacing .... numerical model exists (i.e., if the mass and stiffness matrices are known), the mode shapes are determined by performing ...
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Coupled Rotor-Fuselage Analysis with Finite - Dymore Solutions
The proposed formulation makes use of a component mode synthesis technique that ... used to compute the modes of the elastic components; any commercial finite .... the sole basis of the unconstrained mass and stiffness matrices of the elastic ..... sec and a constant time step ∆t = 3×10−4 sec was used in the simulations.
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Component mode synthesis using undeformed interface coupling
A component mode synthesis approach with constrained coupling interfaces is .... prising of interface DOFs, can be used to generate yet another set of basis ... where K and M are the stiffness and mass matrices respectively, and U and F are the ..... The three orthogonal constant translations in space could be written as ψ( q).
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Consideration of Interface Damping in Shrouded Mistuned Turbine
As a consequence, Component Mode Synthesis methods are used to ... Mistuning of the blades can now be applied in modal space. Coupling of ... Therefore, the mass and stiffness matrix, Mb and Kb must be partitioned into free (f) and interface (i) DOFs. The upper ..... the assumption of a constant normal force is used [6].
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An enhanced AMLS method and its performance - CiteSeerX
Jan 13, 2015 ... The AMLS method has been also used as a solver of eigenvalue problems in ... In this section, the general framework of component mode synthesis (CMS) is ... substructural modes, the global mass and stiffness matrices in Eq. (2) can ...... mode synthesis with constant mass and stiffness matrices applied to ...
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Efficient dynamic modeling for rigid multi-body systems with contact
Jan 26, 2011 ... Gerstmayr J., Ambrosio J.A.C.: Component mode synthesis with constant mass and stiffness matrices applied to flexible multibody systems.
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Coupled Rotor-Fuselage Analysis with Finite - Georgia Tech
the most widely used component mode synthesis techniques are those of ... mass and stiffness matrices, but it should not require additional data. ..... was set to T = 0.2 sec and a constant time step ∆t = 3×10−4 sec was used in the simulations.
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