نتایج جستجو برای: unsteady aerodynamics

تعداد نتایج: 13186  

1999
Mayuresh J. Patil Dewey H. Hodges Carlos E. S. Cesnik

The paper describes a formulation for aeroelastic analysis of aircraft with high-aspect-ratio wings. The analysis is a combination of a geometrically-exact mixed formulation for dynamics of moving beams and finite-state unsteady aerodynamics with the ability to model dynamic stall. The analysis also takes into account gravitational forces, propulsive forces and rigidbody dynamics. The code has ...

2010
Raymond E. Gordnier Peter J. Attar Satish Kumar Chimakurthi Carlos E. S. Cesnik

A high-order (up to 6th order) Navier-Stokes solver is coupled with a structural solver that decomposes the equations of three-dimensional elasticity into cross-sectional, smalldeformation and spanwise, large-deformation analyses for slender wings. The resulting high-fidelity aeroelastic solver is applied to the investigation of both a rigid and moderately flexible rectangular wing undergoing a...

2009
G. Wagner

within Siemens Energy Sector, Oil & Gas Division, Duisburg, Germany. His main fields of interest are rotor/stator interactions and aeroacoustic phenomena in centrifugal compressors. Dr. König has authored several conference and journal papers in the field of unsteady turbomachinery aerodynamics, and, more recently, on excitation mechanisms in centrifugal compressors. Dr. König Studied Mechanica...

2012
Bing Feng Ng Rafael Palacios J. Michael R. Graham Eric C. Kerrigan

This paper introduces a methodology for the design of gust load control systems directly from large aeroelastic models. Firstly, a state-space representation of the vortex particle unsteady aerodynamics suitable for control synthesis is implemented. Secondly, through the use of robust controllers, large reductions in loadings are demonstrated. Thirdly, controllers synthesized from models of coa...

2003
Xinzhong Chen Ahsan Kareem

Current linear aeroelastic analysis approaches are not suited for capturing the emerging concerns in bridge aerodynamics introduced by aerodynamic nonlinearities and turbulence effects. These issues may become critical for bridges with increasing spans and/or with aerodynamic characteristics sensitive to the effective angle of incidence. This paper presents a nonlinear aerodynamic force model a...

2016
Seokkwan Yoon William M. Chan Thomas H. Pulliam

Interactional aerodynamics has been studied for counter-rotating coaxial rotors in hover. The effects of torque balancing on the performance of coaxial-rotor systems have been investigated. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. Computational results for an experimen...

The purpose of this paper is concerned with the mathematical model development issues, necessary for a better prediction of dynamic responses of articulated rotor helicopters. The methodology is laid out based on mathematical model development for an articulated rotor helicopters, using the theories of aeroelastisity, finite element and the time domain compressible unsteady aerodynamics. The he...

2003
Piergiovanni Marzocca Liviu Librescu Walter A. Silva

In addition to its intrinsic practical importance, nonlinear time delayed feedback control applied to lifting surfaces can result in interesting aeroelastic behaviors. In this paper, nonlinear aeroelastic response to external time-dependent loads and stability boundary for actively controlled lifting surfaces, in an incompressible flow field, are considered. The structural model and the unstead...

2004
P. P. Friedmann K. G. Powell

The hypersonic aeroelastic and aerothermoelastic problem of a double-wedge airfoil typical cross-section is studied using three different unsteady aerodynamic loads: (1) third-order piston theory, (2) Euler aerodynamics, and (3) Navier-Stokes aerodynamics. Computational aeroelastic response results are used to obtain frequency and damping characteristics, and compared with those from piston the...

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