TY - GEN
T1 - Hybrid frequency-time domain methods for the analysis of complex structural systems with dry friction damping
AU - Poudou, Olivier
AU - Pierre, Christophe
PY - 2003
Y1 - 2003
N2 - This paper considers the dynamics of complex structures with dry friction dampers attached, such as turbomachinery bladed disks. Two extensions of the Hybrid Frequency/Time domain (HFT) method are introduced to calculate efficiently the steady-state forced response of (1) realistic, tuned assemblies with cyclic properties; and (2), structures represented by reduced-order models which feature - for sake of accuracy and convenience - a high ratio of linear degrees of freedom to nonlinear frictional degrees of freedom. It is shown in particular that for cyclic systems, considering the disk as a rigid support is no longer required to carry out the nonlinear analysis, and that the exact dynamics of a flexible bladed-disk structure can be entirely deduced from the dynamics of one of its sectors. Three numerical examples are also presented. They show that the proposed modifications of the HFT method allow one to study with great efficiency the dynamics of complex, tuned or mistuned flexible assemblies, without sacrificing (1) the fidelity of the modeling of the structure, (2) the realism of the modeling of the frictional interfaces, which can possibly involve variable normal load and lost of contact; and (3), the accuracy of the nonlinear analysis, that is, the number of Fourier coefficients retained to approximate the periodic, steady-state response of the structure.
AB - This paper considers the dynamics of complex structures with dry friction dampers attached, such as turbomachinery bladed disks. Two extensions of the Hybrid Frequency/Time domain (HFT) method are introduced to calculate efficiently the steady-state forced response of (1) realistic, tuned assemblies with cyclic properties; and (2), structures represented by reduced-order models which feature - for sake of accuracy and convenience - a high ratio of linear degrees of freedom to nonlinear frictional degrees of freedom. It is shown in particular that for cyclic systems, considering the disk as a rigid support is no longer required to carry out the nonlinear analysis, and that the exact dynamics of a flexible bladed-disk structure can be entirely deduced from the dynamics of one of its sectors. Three numerical examples are also presented. They show that the proposed modifications of the HFT method allow one to study with great efficiency the dynamics of complex, tuned or mistuned flexible assemblies, without sacrificing (1) the fidelity of the modeling of the structure, (2) the realism of the modeling of the frictional interfaces, which can possibly involve variable normal load and lost of contact; and (3), the accuracy of the nonlinear analysis, that is, the number of Fourier coefficients retained to approximate the periodic, steady-state response of the structure.
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M3 - Conference contribution
AN - SCOPUS:84896850759
SN - 9781624101007
T3 - 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
BT - 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
T2 - 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2003
Y2 - 7 April 2003 through 10 April 2003
ER -