Validation of the FEM model of the Mi-24 tail boom and vertical stabilizer

• Autorzy: Reymer P.
• Języki publikacji: EN

Abstrakty

EN

The scope of this work was the validation process of the numerical model of the Mi-24 helicopter tail boom and vertical stabilizer. In order to obtain a detailed geometry of the actual structure the sophisticated reversed engineering techniques were used. The measurement was performed using two separate techniques: one based on digitalphotogrammetry and other based on a three dimensional laser scanning with ATOSIII scanner. The numerical model was created with use of the obtained geometry, available technical documentation and detailed inspection of the structure. The obtained FEM model was validated using strain measurements of the real structure during characteristic flight maneuvers. A system of foil strain gauges was installed on the tail boom in previously selected locations. Calibration process, using known loads, was performed in order to determine response of the measurement system. To enable a quick and reasonable comparison of results from the experiment and calculations a special element was introduced in the FEM model. Their task was to monitor local strains in places corresponding to those where the strain gauges were installed. Detailed analysis of results confirmed, that after some minor modifications, the developed finite element model represents the actual structure reasonably well. Particular attention was paid to the representation of the boundary conditions and how to implement loads, which can significantly affect the obtained results. The analysis carried through confirms, that the presented validation technique, based on strain measurements, allows verifying a complicated numerical model in a relative cheap, fast and reliable way.

Słowa kluczowe

EN

finite element method; Mi-24 helicopter numerical model; validation

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2011
• Tom: Vol. 18, No. 2
• Strony: 369--376
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Reymer P.

• Instytut Techniczny Wojsk Lotniczych Księcia Bolesława Street 6, 01-494 Warszawa, Poland tel./fax: [phone],

Bibliografia

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• [5] Numeryczna analiza stanu naprężenia materiału w belce ogonowej i końcowej śmigłowca Mi-24, Sprawozdanie nr 81/31/2009, ITWL, Warszawa 2009.
• [6] Kottkamp, E., Wilhelm, H., Kohl, D., NATO Advisory Group for Aerospace Research and Development, AGARDograph No. 160 Vol.7, April 1976.
• [7] Jenkins, J. M., DeAngelis, V. M., A summary of numerous strain-gage load calibrations on aircraft wings and tails in a technology format, Nasa Technical memorandum 4804, Edwards, California 1997.
• [8] Skopionski, T.H., Aiken Jr., W. S., Huston, W. B., Calibration of strain-gage installations in aircraft structures for the measurement of flight loads, NACA report nr 1178.
• [9] Śmigłowiec Mi-24W. Opis techniczny. Książa 2 – Płatowiec i zespół napędowy, Dowództwo Wojsk Lotniczych. Poznań 1989.