Structural dynamic reanalysis method for transonic aeroelastic analysis with global structural modifications

2017 ◽  
Vol 74 ◽  
pp. 306-320 ◽  
Author(s):  
Dongfeng Li ◽  
Qiang Zhou ◽  
Gang Chen ◽  
Yueming Li
Keyword(s):  
Structural Dynamic ◽  
Structural Modifications ◽  
Aeroelastic Analysis ◽  
Dynamic Reanalysis

A Lanczos-based method for structural dynamic reanalysis problems

1994 ◽  
Vol 37 (16) ◽  
pp. 2857-2883 ◽  
Author(s):  
Cheryl M. M. Carey ◽  
Gene H. Golub ◽  
Kincho H. Law
Keyword(s):  
Structural Dynamic ◽  
Dynamic Reanalysis

scholarly journals Aeroelastic Analysis of a Flapping Blow Fly Wing

2020 ◽  
Vol vm01 (is01) ◽  
pp. 14-21
Author(s):  
Can Beker ◽  
Ali Emre Turgut ◽  
Kutluk Bilge Arikan ◽  
Dilek Funda Kurtulus
Keyword(s):  
Fluid Dynamics ◽  
3D Model ◽  
Input Function ◽  
Flapping Wing ◽  
Blow Fly ◽  
Structural Dynamic ◽  
Aeroelastic Analysis ◽  
Sinusoidal Input ◽  
Computational Fluid Dynamics Cfd ◽  
Analysis Models

In this study, a 3D model of the bio-inspired blowfly wing Callphere Erytrocephala is created and aeroelastic analysis is performed to calculate its aerodynamical characteristics by use of numerical methods. To perform the flapping motion, a sinusoidal input function is created. The scope of this study is to perform aeroelastic analysis by synchronizing computational fluid dynamics (CFD) and structural dynamic analysis models and to investigate the unsteady lift formation on the aeroelastic flapping wing for different angles of attack.

scholarly journals Aeroelasticity in Turbomachines: Some Aspects of the Effect of Coupling Modeling and Blade Material Changes

2000 ◽  
Vol 6 (4) ◽  
pp. 265-273 ◽  
Author(s):  
François Moyroud ◽  
Georges Jacquet-Richardet ◽  
Torsten H. Fransson
Keyword(s):  
Dynamic Behavior ◽  
Energy Method ◽  
The Other ◽  
Feedback Effect ◽  
Test Cases ◽  
Eigenvalue Approach ◽  
Structural Dynamic ◽  
Other Hand ◽  
Aeroelastic Analysis

Two methods are generally used for the aeroelastic analysis of bladed-disc assemblies. The first, often referred to as the energy method, assumes that the fluid does not modify invacuum structural dynamic behavior. On the other hand, the second, based on an eigenvalue approach, considers the feedback effect of the fluid on the structure. In this paper, these methods are compared using different test cases, in order to highlight the limitations of the energy method. Within this comparison, the effect of material modifications on the coupled behavior of the assembly is examined.

Universal Matrix Perturbation Method for Structural Dynamic Reanalysis of General Damped Gyroscopic Systems

2004 ◽  
Vol 10 (4) ◽  
pp. 525-541 ◽  
Author(s):  
J. K. Liu ◽  
H. C. Chan
Keyword(s):  
Perturbation Method ◽  
Eigenvalue Problems ◽  
Matrix Perturbation ◽  
Structural Dynamic ◽  
Decomposition Procedure ◽  
Complex Eigenvalues ◽  
Left And Right ◽  
Value Decomposition ◽  
Dynamic Reanalysis ◽  
Gyroscopic Systems

We investigate an effective matrix perturbation method for structural dynamic reanalysis of general damped gyroscopic systems. By using the complex eigensubspace condensation and the or thogonal decomposition procedures, two greatly reduced generalized eigenvalue equations are obtained. The lower-order perturbations of eigensolutions (i.e. complex eigenvalues and the corresponding left and right eigenvectors) are then determined by solving the two reduced eigenvalue problems. The higher-order perturbations of eigensolutions are obtained by executing a singular value decomposition procedure for a complex matrix. The proposed method is a universal perturbation method, for it is universally applicable to the reanalysis of general damped gyroscopic systems with all three cases of complex eigenvalues: distinct, repeated, and closely spaced eigenvalues. Numerical examples corresponding to the three different cases of eigenvalues are presented. The perturbed eigensolutions are computed using the present method and compared with the exact solutions.

scholarly journals AEROELASTIC ANALYSIS OF A FLAPPING BLOW FLY WING

2019 ◽  
pp. 10-18
Author(s):  
Can BEKER ◽  
Ali Emre TURGUT ◽  
Dilek Funda KURTULUŞ
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Dynamic Analysis ◽  
Interaction Analysis ◽  
Blow Fly ◽  
Analysis Model ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Aeroelastic Analysis ◽  
Sinusoidal Input

In this study, 3D model of the bio-inspired blow fly wing Callphere Erytrocephala is created and aeroelastic analysis is performed to calculate its aerodynamical characateristic by use of numerical methods. In order to perform the flapping motion, a sinusoidal input function is created. The scope of this study is to perform aeroelastic analysis by syncronizing computational fluid dynamics (CFD) and structural dynamic analysis model and to investigate the unsteady lift formation on the aeroelastic flapping wing. Keywords: Micro air vehicle, Fluid-structure interaction analysis, Computational Fluid Dynamics, Structural dynamic analysis, Finite element analysis

Structural Dynamic Modifications Using Damped Updated Finite Element Model Updating

2013 ◽  
Author(s):  
V. Arora
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Element Model ◽  
Fe Model ◽  
Structural Damping ◽  
Structural Dynamic ◽  
Structural Modifications ◽  
Damping Matrix ◽  
Fe Model Updating

An accurate finite element model of a structure is essential for predicting reliably its dynamic characteristics. Such a model can be used to predict the effects of structural modifications for dynamic design of the structure. These structural modifications may be imposed by design alterations for operating reasons. Most of the model updating techniques neglect damping and so these updated models can’t be used for accurate prediction of vibration amplitudes. This paper deals with the basic formulation of finite element model updating method having identified structural damping matrix, and its use for structural dynamic modifications. A case involving actual measured data for the case of F-shaped test structure, which resembles the skeleton of a drilling machine is used to evaluate the effectiveness of FE model updating method incorporating identified structural damping matrix for accurate prediction of the vibration levels and thus its use for structural dynamic modifications. Design modifications in terms of mass and stiffener modifications are introduced to evaluate the effectiveness updated model incorporating damping matrices for structural dynamic modifications. It has been concluded that the FE model updating incorporating identified structural damping matrix can be used for structural dynamic modifications with confidence.

New Method of Dynamical Reanalysis for Large Modification of Structural Topology Based on Reduced Model

2012 ◽  
Vol 443-444 ◽  
pp. 628-631 ◽  
Author(s):  
Jian Jun He ◽  
Jie Sheng Jiang
Keyword(s):  
Degrees Of Freedom ◽  
Large Change ◽  
Reduced Model ◽  
Structural Topology ◽  
Improved Method ◽  
High Quality ◽  
Approximation Result ◽  
Structural Dynamic ◽  
Structure Topology ◽  
Dynamic Reanalysis

The paper presents a new improved method for structural dynamic reanalysis with large change in structure topology possessing added degrees of freedom (DOF). The method，which is based on twice reduced model of original and topological structures, combines independent mass orthogonality and Rayleigh-Ritz analysis. Two numerical examples were used to show that the presented method can provide efficient and high quality approximation result for eigenvalues reanalysis when large modifications of the structural topology are made.

A dynamic reanalysis technique for general structural modifications under deterministic or stochastic input

2005 ◽  
Vol 83 (14) ◽  
pp. 1076-1085 ◽  
Author(s):  
Pierfrancesco Cacciola ◽  
Nicola Impollonia ◽  
Giuseppe Muscolino
Keyword(s):  
Structural Modifications ◽  
Stochastic Input ◽  
Dynamic Reanalysis
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