Efficient prediction of classical flutter stability of turbomachinery blade using the boundary element type numerical method

2020 ◽  
Vol 113 ◽  
pp. 328-345 ◽  
Author(s):  
Chandra Shekhar Prasad ◽  
Luděk Pešek
Keyword(s):  
Numerical Method ◽  
Boundary Element ◽  
Efficient Prediction ◽  
Element Type ◽  
Classical Flutter

Boundary element numerical method for the electric field generated by oblique multi-needle electrodes

2009 ◽  
Vol 52 (2) ◽  
pp. 189-197 ◽  
Author(s):  
FuPing Liu ◽  
AnLing Wang ◽  
AnXuan Wang ◽  
YueZu Cao ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Electric Field ◽  
Numerical Method ◽  
Boundary Element

Boundary Element Method Used in Random Response Calculation of the Plate-Beam Structure

1991 ◽  
Author(s):  
J. M. Zhu ◽  
L. Huang
Keyword(s):  
Boundary Element Method ◽  
Numerical Method ◽  
Boundary Element ◽  
Pressure Fluctuation ◽  
Random Vibration ◽  
Power Plants ◽  
Measured Data ◽  
Random Response ◽  
Beam Structure ◽  
Element Method

Abstract The furnace walls of the large boilers in power plants are combined structures consisting of orthotopic plate and equally spaced beams, which are usually submitted to random vibration under the excitation of the pressure fluctuation induced by combustion in the furnace. In this paper, a numerical method based on BEM to compute the random response of the structure is offered. The agreement between the computing results and the measured data in a practical example verifies the effectiveness of the method.

scholarly journals Application of hybrid boundary element method: Example of semishperical ground inhomogeneity

2014 ◽  
Vol 11 (4) ◽  
pp. 617-628
Author(s):  
Nenad Cvetkovic ◽  
Sasa Ilic ◽  
Dragan Vuckovic ◽  
Dejan Jovanovic ◽  
Dejan Krstic
Keyword(s):  
Boundary Element Method ◽  
Point Source ◽  
Numerical Method ◽  
Boundary Element ◽  
Program Package ◽  
Image Theory ◽  
Field Analysis ◽  
Grounding System ◽  
Em Field ◽  
Element Method

One new, so-called hybrid boundary element method (HBEM) is presented in this paper. It is a recently proposed numerical method for stationary and quasi-stationary EM field analysis. The method application is illustrated on the example of solving the problem of modelling hemispherical ground inhomogeneity influence on grounding system. The applied procedure also includes using of quasi-stationary image-theory. The obtained results are compared with those ones based on using the Green?s function for the point source inside semi-spherical inhomogeneities as well as with the results obtained by applying COMSOL program package.

Direct Nondestructive Algorithm for Shape Defects Evaluation

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Sebastián Ossandón ◽  
José Klenner ◽  
Camilo Reyes
Keyword(s):  
Boundary Element Method ◽  
Nondestructive Evaluation ◽  
Numerical Method ◽  
Boundary Element ◽  
Stability And Convergence ◽  
Nondestructive Analysis ◽  
Numerical Examples ◽  
Galerkin Boundary Element Method ◽  
Shape Differentiation ◽  
Analysis Stability

An efficient numerical method based on a rigorous integral formulation is used to calculate precisely the acoustic eigenvalues of complex shaped objects and their associated eigenvectors. These eigenvalues are obtained and later used in acoustic nondestructive evaluation. This study uses the eigenvalues to implement a simple acoustic shape differentiation algorithm that is the key in our direct nondestructive analysis. Stability and convergence of the Galerkin boundary element method used herein are discussed. Finally, some numerical examples are shown.

HYDRODYNAMIC COEFFICIENTS AND FORCES ON MULTIHULLS IN SHALLOW WATER WITH CONSTANT OR VARIABLE DEPTH

Transport ◽  
2008 ◽  
Vol 23 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Noureddine Dabssi ◽  
Mohamed Chagdali ◽  
Alain Hémon
Keyword(s):  
Boundary Element Method ◽  
Shallow Water ◽  
Numerical Method ◽  
Boundary Element ◽  
Added Mass ◽  
Hydrodynamic Coefficients ◽  
Variable Depth ◽  
Harmonic Oscillations ◽  
Hull Forms ◽  
Hydrodynamic Reaction

Numerical and hydro dynamical procedures are developed to compute bidimensional hydrodynamic coefficients and forces on multihulls associated with harmonic oscillations in shallow water with constant or variable depth. The forces are composed of two parts and include the sum of incident and diffracted forces and hydrodynamic reaction. The latter one is used to determinate the hydrodynamic coefficients (added mass and damping). The numerical method used is the Boundary Element Method. We can compute flow around multihulls sections. An application to cylindrical, right triangular and rectangular hull forms is presented.

scholarly journals Unsteady Flow Calculation in a Vibrating Cascade and Aerodynamic Damping Prediction

1985 ◽  
Author(s):  
D. Garreau ◽  
F. Tephany
Keyword(s):  
Boundary Element Method ◽  
Unsteady Flow ◽  
Numerical Method ◽  
Boundary Element ◽  
Steam Turbine ◽  
Blade Surface ◽  
Flexural Mode ◽  
Flow Calculation ◽  
Aerodynamic Damping ◽  
Phase Angles

A numerical method has been developed for predicting the aerodynamic damping of the last L.P. stages in a 900 MW steam turbine on a blade to blade surface using a boundary element method. The results obtained on the first flexural mode of the blades for several displacements and for several interblade phase angles show no unstability of the rotor except perhaps for low phase angles. They also prove that quasisteady calculations are relevant for all the cases tested.

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