Application of optical videogrammetry technique for normal deformation fields of aircraft fuselage panel meausring

Aeronautical and Space-Rocket Engineering

Design, construction and manufacturing of flying vehicles


Аuthors

Busarova M. V.*, Zhelonkin S. V.**, Kulesh V. P.*, Kuruliuk K. A.***

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

*e-mail: mera@tsagi.ru
**e-mail: zhelonkin00@gmail.com
***e-mail: ksusha_kp_13@mail.ru

Abstract

An important part of aircraft fuselage panels testing for fatigue and survivability is the study of normal deformation fields of buckling and warping of the skin. The article describes optical videogrammetry technique and its application for non-contact measurements of distributed normal fuselage panels’ deformations of a passenger aircraft under testing for internal overpressure.

Strength, reliability and resource of modern aircraft are ensured by multilateral experimental studies of the structural elements behavior under regular and extreme external impacts. One of the types of such tests is the study of aircraft fuselage panels deformation under the impact of internal overpressure. Significant component of deformation herewith refers to the displacement of points in direction of a normal to the surface, i.e. normal deformation. These deformations are of a complex character distributed over the surface. To obtain the full pattern of the distributed normal deformation measurement in a large number of points are required. Strain gauging is a traditional technique for deformation measuring. However, complex deformation fields studying with pattern, which complicates sensors placement and strain gage measurements results interpretation.

At present, contactless optical video-grammetry technique (VGT) manifested itself as a prospective trend for distributed deformations measuring. The results of measurements represent not relative deformation, but normal displacements of the surface points directly. It gives an additional advantage when interpreting the results and comparing them with the calculation or mathematical model of warping and buckling of the skin.

The goal of the presented work consisted in improving contactless optical video-grammetry technique for distributed normal deformations measuring at a large number of the surface points, and this technique application for testing aircraft fuselage panels under internal overpressure.

Video-grammetry technique with one digital camera was chosen (mono-grammetry method) for these measurements. This choice was stipulated by lack of space around the panel being tested on the experimental setup.

Keywords:

non-contact measurements, videogrammetry technique, normal deformations, deformation fields, structure destruction

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