Fatigue loads as an inverse problem of the helicopter tail beam structural dynamics

• Autorzy: Dymitruk J. , Laudański M.

Warianty tytułu

PL

Obciążenia zmęczeniowe jako odwrotne zagadnienie dynamiki belki ogonowej śmigłowca

• Języki publikacji: EN

Abstrakty

EN

The paper presents a brief report related to the experimental research done under substantial financial support from the side KBN (National Scientific Research Council, Poland) in the Structural and Component Test Laboratory of the Aviation Institute in Warsav, Poland. The tail beam of the "Sokol" helicopter was under experimental investigation going to work out a method enabling to determine such external loads (assuming to impose them by three hydraulic actuators) which caused in the tail beam structure at five given cross sections a priori given loads being a combination of bending and twisting moments of the prescribed magnitude. These in turn were selected in test flights by a Polish helicopter factory research project managed prior to the investigation. It was earlier established that such elastic structure as a helicopter tail hardly enables to involve experimental fatigue loads due to a serious threat of a domage done before the fatigue life is asessed. Such a demand gradually led to the precise formulation of the problem which afterwards has been successfully solyed fulfilling practically accepted accuracy requirements. The paper presents the main idea of the optimization procedure which became the main part of the research worked out in a due course and particularities of the numerical calculations belonging to the research documenting the efficiency of the proposed method.

PL

Opracowano eksperymentalną metodę wyznaczania za pomocą obciążeń zewnętrznych zadanego stanu obciążeń w strukturze belki ogonowej śmigłowca.

Słowa kluczowe

EN

fatigue loads; inverse problem; helicopter tail beam structural dynamics

PL

obciążenia zmęczeniowe; zagadnienie odwrotne; dynamika belki ogonowej śmigłowca

• Wydawca: Wydawnictwa Naukowe Instytutu Lotnictwa
• Czasopismo: Prace Instytutu Lotnictwa
• Rocznik: 2005
• Tom: Nr 1(180)
• Strony: 49--53
• Opis fizyczny: Bibliogr. 12 poz., rys., wykr., wzory

Twórcy

autor

Dymitruk J.

• Institute of Aviation, Warsaw

autor

Laudański M.

• Rzeszow University of Technology

Bibliografia

• [1] W.Weibull: Fatigue Testing and Analysis of Results. Pergamon Press, Oxford 1961.
• [2] K. Sobczyk, B. F. Spencer, Jr.: Random Fatigue. From Data to Theory. Academic Press, Boston 1992.
• [3] L. M. Laudański: Computational Probability for Aeronautical Engineering. Wydawniclwa Instytutu Lotnictwa, Warszawa 2002.
• [4] R. E. Little, E. H. Jebe: Statistical Design of Fatigue Experiments. Applied Science, London 1975.
• [5] Fatigue in Aircraft Structures. Edited by A.. M. Freudenthal. Academic Press, New York 1956 . Paper of B. O. Lundberg: Fatigue Life of Airplane Structures - originally printed in JAS, v. 22, No. 6, pages: 349-402, 1955.
• [6] O. Buxbaum: Betriebsfcstigkeit. Sichere und wirtschaftliche Bemessung schwingruchgefährdeter Bauteile. Stahl - Eissen 1992.
• [7] Julius S. Bendat: Principles and Applications of Random Noise Theory - John Wiley & Sons. 1971.
• [8] Julius S. Bendat, Allan G. Picrsol: Random Data: Analysis and Measurement Procedures. John Wiley & Sons. 1971.
• [9] J. P. Den Hartog: Mechanical Vibrations. John Wiley & Sons, 1971.
• [ l0] Tadeusz Kaczorek : The Control Theory (in Polish) PWN. Warszawa 1977.
• [11] John R. Taylor : An Introduction to Error Analysis. The Study of Uncertainties in Physical Measurements. University Science Books, 1982.
• [12] Wanda Szemplińska, Rościsław Aleksandrowicz: Ground Resonance Testing of Sailplanes, Proceeding of the 7th OSTIV Congress, Leszno, Poland. June 1958.