Flutter analysis and prevention for wings with large concentrated inertias

  • 4.19 MB
  • 6678 Downloads
  • English
by
Statementby V.T. Nagaraj.
ID Numbers
Open LibraryOL20030534M

Flutter analysis and prevention for wings with large concentrated inertias Author: Nagaraj, Vengalattore T. Awarding Body: Loughborough University of Technology Current Institution: Loughborough University Date of Award: Author: Vengalattore T. Nagaraj. Flutter problem has been of great interest since early years of flight these will lead to aerodynamic instability and life reduction of an aircraft wing and its while designing an aircraft these flutter has to be consider.

We had analyzed a subsonic passenger aircraft in its cruise speed using optimization tools CFD and FEA by: 3. FLUTTER ANALYSIS OF WING, BOOSTER FIN AND VERTICAL TAIL. An interactive computer program was developed for wing flutter analysis in the conceptual design stage. The objective was to estimate flutt er instability boundaries of a typical wing, when detailed structural and aerodynamic data are not available.

Effects of change in key flu tter parameters can also be estimated in order to guide the conceptual design. wing flutter analysis with an uncoupled method-kavukcuoglu, koray, supersonic flutter and post- flutter control of an aircraft wing section. piergiovanni marzocca, liviu livrescu, walter a.

silva flutter in the sky-charbel farhat status of unsteady aerodynamic prediction for flutter of. When conducting flutter analysis on a wing, it is common to simply constrain the root of the wing to be fixed.

When conducting a flutter analysis on a full aircraft however, it is very important to consider how the Flutter analysis and prevention for wings with large concentrated inertias book of the rigid body motion can also couple with the structural and aerodynamics of the model.

In this paper, the aeroelastic modeling and conceptual flutter analysis of a simple 2-D box wing is investigated. For each wing the torsion and bending elasticity is simulated by two torsional and longitudinal springs at its elastic axis. Furthermore, the connection winglet is.

2 | L e T h a i H o a – F l u t t e r s t a b i l i t y a n a l y s i s: T h e o r y & E x a m p l e FLUTTER STABILITY ANALYSIS 1. INTRODUCTION There are two typical types of bridge flutter were i) Torsional flutter that the fundamental torsional mode dominantly involves to the flutter instability ii) Coupled flutter.

I wonder if there is any new code that supports the Flutter analysis (aeroelastic) thanks Flutter analysis of a wing -- CFD Online Discussion Forums [ Sponsors ]. hi everybody, Can some one help me in carrying out flutter analysis in fluent over a NACA airfoil. How to assign moving mesh and also if you can Flutter analysis on a wing -- CFD Online Discussion Forums.

MODERN AERODYNAMIC FLUTTER ANALYSIS describes the analysis sequence starting with determining mode shapes and eigen values from a finite element analysis, ground vibration survey test, flutter analysis using a doublet-lattice method and, finally, a sensitivity study.

Several examples are presented including the wing of the Lancair IV, the. The analysis method was based on non-dimensional parametric plots of two primary flutter parameters, namely Regier number and Flutter number, with normalization factors based on wing torsion stiffness, sweep, mass ratio, taper ratio, aspect ratio, center of gravity location and pitch-inertia radius of gyration.

Flutter analysis of wingletted wing. The addition of a winglet to the basic wing constituted a further research model, namely wingletted transport-type wing. Theoretically, fundamental factors of the winglet that may affect the wing flutter included: aerodynamics, mass and stiffness.

Tian B., Ghia K.N. () Aeroelasticity analysis of aircraft wings in flutter-onset or post-flutter regime.

Description Flutter analysis and prevention for wings with large concentrated inertias FB2

In: Kutler P., Flores J., Chattot JJ. (eds) Fifteenth International Conference. Volumes I and III detail the analysis of the wing and control surfaces, respectively.

Results of the empennage flutter analysis indicate a possible flutter situation existing within the design flight envelope of the XV-5A aircraft. The flutter mode is characterized by horizontal tail pitch coupled with basically symmetric horizontal.

Flutter analysis ensures the aircraft is safe and free from flutter at all points in the flight envelope. Flight flutter tests must be performed to demonstrate the accuracy of the analysis and prove the airplane is safe to operate. mass-balanced or hydraulically stiffened control surfaces and structural mass concentrated toward the wing or.

The flutter analysis of swept aircraft wings carrying a powered engine is presented. Because of the powered engine, both concentrated engine mass and the thrust force terms are combined in the governing equations which are obtained using Hamilton’s principle.

Jinsoo and Younhyuck [11] developed a frequency-domain flutter analysis scheme for wings using an unsteady 3D panel method. The unsteady aerodynamic force calculation was based on the s-plane unsteady nonplanar lifting surface method while a finite element method was used to structurally model the wing.

The supersonic flutter analysis was done. Flutter analysis using test modal data Generally, linear flutter analysis is performed using finite element method in the aeronautical industry at large. Here FEM model represents the structure and linear unsteady aerodynamics in the frequency domain is.

The flutter analysis of swept aircraft wings carrying a powered engine is presented. Because of the powered engine, both concentrated engine mass and the thrust force terms are combined in the.

Flutter is an aero-elastic problem, a complicated sort of spring-mass-damper issue. Complicated because spring, mass, damping and the applied force are linearly distributed over the wing span.

Basically, the problem is as follows: The wing root is fixed to the aircraft fuselage, the wing. Although, the large quantity of papers associated with wing flutter analysis makes it almost impossible to consider them all, flutter researches on clean wings [5,6], wings carrying external.

Abstract. An interactive computer program was developed for wing flutter analysis in the conceptual design stage. The objective was to estimate the flutter instability boundary of a flexible cantilever wing, when well defined structural and aerodynamic data are not available, and then study the effect of change in Mach number, dynamic pressure, torsional frequency, sweep, mass ratio, aspect.

The flutter analysis of a wing with an external store is presented. Because of the external store, the concentrated store mass is combined into the governing equations which are obtained using the extended Hamiltons principle.

Dirac function is used to precisely consider the location and properties of the external store. The k method is used to calculate the flutter velocity.

Download Flutter analysis and prevention for wings with large concentrated inertias PDF

Flutter Analysis - q Locus From “Flight Dynamics” Model Real, /sec 0 10 Imag, rad/sec 0 10 20 30 40 50 60 70 80 90 Dynamic-Pressure (q) Locus 1st Sym. Torsion 1st Sym. Bending Elastic Short Period Phugoid Flutter 2nd Sym. Bending BFF Vehicle Longitudinal Dynamics Sea Level Two flutter conditions.

Final Year Project Proposal BSc. Mechanical Engineering The University of the West Indies, St Augustine. Flutter-Speed FormulaAn estimate of wing flutter speeds was obtained from a flutter-speed criterion 1, ~.

The criterion written in the form of a flutter-speed ) formula is ratio of actual cross inertia to the geometric mea n of the direct inertias did not exceed for any of tile wings.

The flutter calculations were made using. Flutter and Resonance Characteristics Cantilever Wing Carrying Localised N. LAa~BOURNE, of the Aerodynamics Division, N.P.L.

of a Model Masses Reports and Memoranda No. 2 8 6 6" A/pril, i SummaryResonance tests on a model cantilever wing carrying concentrated masses were made in.

Details Flutter analysis and prevention for wings with large concentrated inertias EPUB

In today’s aviation world, the design of aircraft wing becomes a challenging one for aeronautical engineers, in order to meet the aero elastic phenomenon such as flutter, wing divergence in both aerodynamics and structural aspects.

There are so many FEM packages available for both flow and structural analysis such as ANSYS, NASTRAN, ALGOR, NISA, ADINA, COSMOS, etc. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): An interactive computer program was developed for wing flutter analysis in the conceptual design stage.

The objective was to estimate flutter instability boundaries of a typical wing, when detailed structural and aerodynamic data are not available. Effects of change in key flutter parameters can also be estimated in. Project Overview Goal: Actively Optimize Wing Shape - Transport Aircraft Approach: Use Flexibility to an Advantage, MDAO, active control • Active flutter suppression is a key enabling technology • Critical PAAW program components – Three different vehicles will be developed and flight tested The first will be very similar to Lockheed Martin’s FFAD (X).An Abaqus implementation of a flutter suppression control system for a joined three-dimensional (3D)/one-dimensional (1D) finite element model of damaged high-aspect-ratio wings is presented.

By doing so, one can exploit the modeling, solution, and postprocessing capabilities of Abaqus in aeroservoelastic analysis and design.wing sweepback angle, mass ratio, aspect ratio, taper ratio, center of gravity, and pitch moment of inertia, on flutter instability boundary. In order to meet these objectives, an interactive computer program was developed for preliminary flutter analysis of a flexible cantilever wing.