On experimental determination of aircraft structures stiffness characteristics

Strength and thermal conditions of flying vehicles


Аuthors

Amiryants G. A.*, Malyutin V. A.**

Central Aerohydrodynamic Institute named after N.E. Zhukovsky, TsAGI, 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia

*e-mail: amiryants@mail.ru
**e-mail: viktor.malyutin@tsagi.ru

Abstract

The competitive air materiel development is impossible without permanent improvement of methods for the aircraft stiffness characteristics studies, as well as their elastically similar and “rigid” aerodynamic models. The goal of the work consists in increasing the efficiency, informativity and precision of the stiffness characteristics study.

The article presents the results of studies aimed at improving the system of the stiffness characteristics experimental determination of full-scaled air materiel objects and their aeroelastic models. It presents a brief description of some basic elements of the system, in particular, the robotic test bench for determining stiffness characteristics, multi-channel data acquisition system, and automated loading system.

The results of experimental studies using the above said technical means are presented. For example, using the automated loading system and data acquisition system, the stiffness of fastening elements of the aerodynamic model in the wind tunnel working section was determined. The measured stiffness parameters were used in the computational scheme of the model in the ARGON software package, on which basis the aerodynamic loads were computed. The robotic test bench application for stiffness characteristics determination while determining the beam stiffness characteristics, and influence coefficients matrix allowed quickly and efficiently performing the stiffness tests of the elastically scaled model frame.

Some examples of ARAMIS stereophotogrammetrical system application for measuring spatial movements are presented. The abilities of this system are illustrated by its application in the international AFLoNext project of the Seventh Framework European programme. Quickly obtained data helped to compose a quantitative representation of the mutual movements of the engine nacelle, pylon and wing compartment. Another example of the ARAMIS application system is the of displacements measurement of the high aspect ratio wing in the wind tunnel flow.

The developed and improved system is one of the main elements of a multidisciplinary approach to the design of advanced air materiel, safe in terms of aeroelasticity and strength, and perfect in weight efficiency, aerodynamic and tactical-technical characteristics.

Keywords:

aeroelasticity, experiment, stiffness tests, elastic deformation measurement

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