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Registration Number

0224U031355, 0123U100590 , R & D reports

Title

Development of methods for numerical simulation of nonlinear oscillations of the wing with damage in a single structural element

Head

Filipkovskyi Serhii V., Доктор технічних наук

Registration Date

15-04-2024

Organization

National Aerospace University "Kharkiv Aviation Institute"

Description

 The object of study is the flutter of an aircraft wing in the presence of free play in the mechanical wiring of control surfaces. Purpose of the work: development of numerical methods for determining the frequencies and shapes of free vibrations and the stability of forced vibrations of an aircraft wing with damage to a separate structural element. Current economic constraints and environmental regulations require the development of more efficient aircraft configurations. An observed trend in aircraft design to reduce lift-induced drag and reduce fuel consumption and emissions is to increase wing aspect ratio. However, a thin wing is more flexible and subject to higher deflections under the same operating conditions. This effect can lead to changes in dynamic behavior and aeroelastic response, potentially leading to instability. Therefore, it is important to take into account geometric nonlinearities when designing high aspect ratio wings, as well as to have accurate calculation programs that link aerodynamic and structural models in the presence of nonlinearities. Damage to individual structural elements may be such that can be avoided if operating rules are followed, or inevitable. The first are fatigue cracks, corrosion, and breakdowns from accidental impacts. The latter is wear of the hinge joints as a result of long-term use. It leads to an increase in the initial free play of the control surfaces of the wing and tail to such sizes that can provoke a change in the aeroelastic characteristics of the aircraft. Due to the importance of solving the problem of free play in airfoil control wiring, many studies have now emerged to develop more advanced and accurate analytical models. Modern theoretical and experimental analysis of free play opens up many new studies of aeroelasticity. Although the fundamental problem is believed to be understood and local modeling approaches exist, backlash studies continue to provide varying predictions of aeroelastic dynamic behavi

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Srarodub Oleksii V.
Filipkovskyi Serhii V.