Analysis of Stresses in Helicopter Composite blade in Hovering Maneuver

Document Type: Persian

Authors

1 Assistant Professor-University of Imam Ali (a.s)-Iran

2 A graduate of the master of mechanical engineering, Faculty of engineering, Shahid beheshti University

Abstract

The main purpose of this article is the structural analysis of a composite blade of a selected helicopter. In this study, the stresses on rotors' blades caused by centrifugal forces, lift, drag and torque are analyzed. The governing equations of the structure behavior and solving processes were carried out by MATLAB software, and simulation is carried out by ABAQUS software, and they are compared with each other. The program written for MATLAB is based on beam element theory and the computation of stress and displacement of considered elements of a blade, is one of the properties of the written code. In ABAQUS, the helicopter blade is simulated in various states such as composite and aluminum blade with/without web and composite blade with laminations in different angles. The results of the mentioned states are compared with each other and with the code and finally, the results are compared with reference article. Comparison between beam element results and ABAQUS simulation shows proper match. In order to optimize a composite blade, attention must be paid to factors such as, displacement and stress reduction and prevention of excess in weight, as by an increase in thickness of 45 and 90 degree laminates to 6.5 mm, maximum displacement would be 12.9 cm, and total weight of the structure would be 8 Kg.

Keywords


  1. D. Brian, Larder helicopter HUM/FDR, benefits and developments, 55th Annual Forum of the American Helicopter Society, 1839, Montreal, Canada.

  2. P. W. Stevens, D. L. Hall, E. G. Smith, A multidisciplinary research approach to rotorcraft health and usage monitoring, 52nd Annual Forum of the American Helicopter Society, 1732, Washington, DC, USA.

  3. D. Barwey, D. A.  Peters, Optimization of composite rotor blades with advanced structural and aerodynamic modeling, center for computational mechanics Department of mechanical engineeing, Vol. 19, No. 3, 1994, pp. 193-219.

  4. G. Ranjan, I. Chopra,  Aeroelastic optimization of a helicopter rotor with two-cell composite blades,  AIAA journal, Vol. 34, No. 4, 1996, pp. 566-573.

  5. J. E. Kim, S. Klijn, Structural Optimization for Light-weight Articulated rotor Blade,41sth AIAA/ ASME/ ASCE/ AHS/ASC Structures,  tructural Dynamics, and aterialsConference, 3-6 April 2000, California, USA.

  6. J. E. Kim, S. Klijn, Elastic-dynamic Rotor Blade Design with Multiobjective Optimization, AIAA Journal, Vol. 39, No. 9, 2001, pp. 1652–1661.

  7. Guo, Jun-Xian, and Jin-Wu Xiang, Composite Rotor Blade Design Optimization for Vibration Reduction with Aeroelastic Constraints. Chinese journal of aeronautics, Vol. 17, No. 3, 2004, pp. 152-158.

  8. V. V. Volovoi, L. Li, J. Ku, D. H. Hodges, Multi-level Structural Optimization of Composite Rotor Blades, 46th AIAA/ ASME/ ASCE/AHS/ASC  Structures, Structural Dynamics, and Mate-rials Conference, 2005, Austin, Texas.

  9. L. Li, J. Ku, V. V. Volovoi, D. H. Hodges, Cross -Sectional Design of  omposite Rotor Blades,63rd Annual Forum of the American Helicopter Society, Journal of Intelligent Material Systems and Structures, 2-5 September 2008, Virginia, USA.

  10. Li. Leihong, Structural design of composite rotor blades with consideration of manufacturability, durability, and manufacturing uncertainties,  Engineering Mechanics, University of Georgia, 2008.

  11. K. K. Saijal, Optimization of helicopter rotor using polynomial and neural network metamodels. Journal of Aircraft, Vol. 48, No. 2, 2011, pp. 553-566.

  12. H. Debski,  Numerical Fem Analysis For the part of Composite Helicopter Rotor Blade,Journal of Kones powertrain and transport, Vol. 19, No. 1, 2012.

  13. A. NOUR, M. T. GHERBI, Modes shape and harmonic analysis of different structures for helicopter blade, 30th european conference on acoustic emission testing and 7th international conference on acoustic emission university of Granada, 12-15 September 2012, Granada, Spain.

  14. S. Sastry, I. Bhargavi Rachana, K. Durga Rao, Stress Analysis of Helicopter Composite Blade Using Finite Element Analysis, International Journal of Engineering Research and Technology, Vol. 2, No. 12, 2013, pp. 1291-1299.

  15. D. Kumar, Design and Analysis of Composite Rotor Blades for Active/Passive Vibration Reduction,Engineering Mechanics, University of Michigan, 2013.

  16.  D. Kumar, New strategy for designing composite rotor blades with active flaps, Journal of Intelligent Material Systems and Structures, 21-24 October 2015, Michigan, USA.

  17. R. Koohi, H. Shahverdi, H. Haddadpour, Modal and Aeroelastic Analysis of a High-Aspect-Ratio Wing with Large Deflection Capability, International journal advanced design and manufacturing technology, Vol. 8, No. 1, 2015, pp. 45-59.

  18. D. Taherifar, M. Mohseni shakib, M. Shahabi, The composite rotor blade optimization by using a combination finite element method and genetic algoritm, majlesi Mechanical Engineering, Vol. 4, No. 3, 2011, pp. 13-23.

  19. I. J. Park, S. N. Jung, General purpose cross-section Analysis program for composite rotor blades, Internatuonal journal of aeronautical and space sciences, Vol. 10, No. 2, November 2009, pp. 77-85.

  20. M. Todorov, I. Dobrev, F. Massouh C. Velkova, Aeroelastic Investigation of Hingeless Helicopter Rotor in Hover, International Journal of Engineering Research and Technology, 8-12 June 2012, Paris, France.