What causes aeroelastic flutter?
What causes aeroelastic flutter?
If the wing twists a bit for some reason, the angle of attack changes. That changes the lift force on the wing, which makes it start to flap up or down. But the up and down motion also changes the airflow over the wing, which can create a force causing it to twist.
What is static Aeroelasticity?
Static aeroelasticity is the study of the deflection of flexible aircraft structures under aerodynamic loads, where the forces and motions are considered to be independent of time.
What is the aeroelastic effect?
Aeroelasticity in regard to aircraft structures is defined as the branch that investigates the phenomena that emerge due to the interaction of aerodynamic (in particular unsteady), inertial and elastic forces emerging during the relative movement of a fluid (air) and a flexible body (aircraft).
What is torsional divergence?
Torsional divergence, also called lateral buckling, can occur on airfoils or bridge decks. Like galloping, it can be modeled by using aerodynamic properties measured on the body at rest. Wind Effects on Structures: Modern Structural Design for Wind, Fourth Edition.
What is aeroelastic divergence?
Static aeroelasticity Divergence is a phenomenon in which the elastic twist of the wing suddenly becomes theoretically infinite, typically causing the wing to fail.
Is aeroelastic flutter resonance?
Although the two modes each had their own resonant frequencies, they did not coincide with each other and cause the failure. This case of aeroelastic flutter was not caused by resonance.
What is aeroelastic model?
Abstract. An aeroelastic model of the wing/engine system of a large commercial aircraft is established. Taking into account the engine inertia force and thrust, static aeroelastic deformation of the wing structure and load distributions including shear force, bending moment and torque are studied.
What is aeroelastic analysis?
Aeroelastic analysis is based on the coupling of a structural dynamics model and an aerodynamic model, where typically, in an industrial environment, the structure is modeled by a finite-element model, and the aerodynamics is modeled by a linear panel aerodynamic model .
What is aeroelastic simulation?
The Aeroelastic Simulation Department focuses on the numerical analysis of aeroelastic problems. Investigations for transport aircraft, small aircraft, turbomachines and rotorcraft are performed in close cooperation with the experimental activities of the institute.
AEROELASTIC DIVERGENCE1 Static problems, Dynamic problems, for which time is a variable: aerodynamic structural- AEROELASTIC DIVERGENCE1 Aeroelasticity is the discipline concerned with the mutual interaction of struc- tural, aerodynamic and inertial forces on a °exible solid body moving through a °uid.
How do I perform a static aeroelastic divergence analysis?
A static aeroelastic divergence analysis is available by specifying a DIVERG Case Control command in a subcase. The divergence analysis is performed at the Mach numbers specified on the corresponding DIVERG Bulk Data entry. Any of the aerodynamic methods can be utilized for divergence analysis.
What is the difference between static and dynamic aeroelasticity?
The study of aeroelasticity may be broadly classified into two fields: static aeroelasticity dealing with the static or steady state response of an elastic body to a fluid flow; and dynamic aeroelasticity dealing with the body’s dynamic (typically vibrational) response.
What is divergence in aerodynamics?
This phenomenon is known as divergence, and can cause catastrophic failure in any aircraft. Most aeroelastic behavior is not so conceptually simple, however this example illustrates the fundamental concept of the coupling physics well.