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Modal Numerical Analysis of Helicopter Rotor Sample Using Holzer-Myklestad Method | ||
| Journal of Stress Analysis | ||
| مقاله 11، دوره 3، شماره 1، آذر 2018، صفحه 111-121 اصل مقاله (1.23 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22084/jrstan.2018.16306.1049 | ||
| نویسندگان | ||
| H. Rabiee؛ S.A. Galehdari* | ||
| Mechanical Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran. | ||
| چکیده | ||
| Since rotor system of helicopters is responsible for producing lift forces and thrust, analyzing their vibrations is very essential. This research describes a method applied for developing a computer program to analyze coupled vibration of helicopter rotor. Natural frequency and rotor blade mode shapes were analyzed by MATLAB software. In-plane, out-of-plane coupled and torsion vibration were also considered in this analysis. First, Myklestad method, which is one of the most accurate ones to calculate vibration, was used to find governing equations of rotor vibrations. Based on governing equation, vibration code was developed by MATLAB software. After that for validating the program, the obtained results were compared with numerical results using PATRAN software, with maximum 4.264% error. In these problems, three beams in different geometric and material conditions with clamped end were defined. The innovation of this research is developing a MATLAB code to calculate the coupled natural frequencies and mode shapes of helicopter blade. | ||
| کلیدواژهها | ||
| Coupled modal analysis؛ Helicopter؛ Blade؛ Matlab؛ Myklestad method | ||
| مراجع | ||
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[1] C. Houbolt, G.W. Brooks, Differential equations of motions for combined flap wise bending and torsion of twisted non-uniform rotor blades, NACA Report 1346, (1958). [2] R.L. Bielawa, Rotary wing structural dynamics and aeroelasticity, American Institute of Aeronautics and Astronautics (AIAA) Education Series, Washington, D.C. AIAA Inc, (1992). [3] A.D. Wright, C.E. Smith, R.W. Thresher, J.L.C. Wang, Vibration modes of centrifugally stiffened beams, ASME J. Appl. Mech., 49(1) (1982) 197-202. [4] G. Surace, V. Anghel, C. Mares, Coupled bendingbending-torsion vibration analysis of rotating pretwisted blades: an integral formulation and numerical examples, J. Sound. Vib., 206(4)4 (1997) 473-486. [5] S.M. Lin, The instability and vibration of rotating beams with arbitrary pretwist and an elastically restrained root, ASME J. Appl. Mech., 68(6) (2001) 844-853. [6] S.M. Lin, S.Y. Lee, W.R. Wang, Dynamic analysis of rotating damped beams with an elastically restrained root, Int. J. Mech. Sci., 46(5) (2004) 673-693. [7] S.Y. Lee, S.M. Lin, T. Wu, Free vibrations of rotating non-uniform beam with arbitrary pretwist, An elastically restrained root and a tip mass, J. Sound. Vib., 273(3) (2004) 477-492. [8] S. Newman, The Foundations of Helicopter Flight, Butterworth-Heinemann, Elsevier, (1994). [9] Headquarters, U.S. Army Materiel Command, Engineering design handbook for helicopter engineering (AMCP 706-201) Part I, Preliminary Design, (1974). [10] A.R.S. Bramwell, D. Balmford, G. Done, Helicopter Dynamics, Butterworth-Heinemann, Elsevier, (2001). [11] S. Graham Kelly, I. Morse, R.T. Hinkle, Mechanical Vibrations Theory and Applications, Cengage, (2012). [12] P. Skalski, Testing of a composite blade, Acta Mech. Autom., 5(4) (2011) 101-104. [13] S. Rizo-Patron, J. Sirohi, Operational modal analysis of a helicopter rotor blade using digital image correlation, Exp. Mech., 57(3) (2017) 367-375. [14] A. Teter, J. Gawryluk, Experimental modal analysis of a rotor with active composite blades, Compos. Struct., 153 (2016) 451-467. [15] P. Sarker, R.C. Theodore, K. Chakravarty, Vibration analysis of a composite helicopter rotor blade at hovering condition, Adv. Aero. Tech., 1 (2016) 1-10. [16] R.L. Bennett, Digital computer program DF1758 fully coupled natural frequencies and mode shapes of a helicopter rotor blade, NASA-CR-132662, (1975). [17] R.L. Bennett, Rotor system design and evaluation using a general purpose helicopter flight simulation program, Specialists meeting on helicopter rotor loads prediction methods, Defense Technical Information Center, (1973). [18] S.G. Sadler, Informal Final report on blade frequency program for nonuniform Helicopter rotors, with Automated Frequency Search, NASA CR-112071, (1972). [19] R.J. Gould, R.F. Hoskin, J.A. Milner, M.J. Fratt, Computational methods in linear algebra, John Wiley & Sons, (1974). | ||
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