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August 10, 2023
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August 10, 2023
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Abstract

This paper investigates the aeromechanics of a prescribed 2.1g pull-up maneuver for a helicopter rotor. The simulation is carried out using multibody based Computational Structural Dynamics (CSD) model tightly coupled to a high-fidelity Computational Fluid Dynamics (CFD) solver. The predictions are also compared with those obtained using lifting-line based comprehensive analysis to highlight the capabilities of a high-fidelity simulation. The results show considerable improvements in the predicted results by using a CFD model over a traditional lifting-line approach. In particular, coupled CFD/CSD simulation is able to correctly predict the magnitude and phasing of the two dynamic stall cycles on the retreating side of the rotor disk during the maneuver. Further, it shows significant improvement in the predicted peak-to-peak structural loads. The advancing blade stall is not predicted by either of the analysis. The study also shows some deficiencies in the ability to predict blade torsional loads.

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How to Cite
., A. (2023). Prediction of Helicopter Blade Loads for an Unsteady Pull-Up Maneuver Using Lifting-Line and CFD/CSD Analyses. Journal of Aerospace Sciences and Technologies, 65(2), 178–195. https://doi.org/10.61653/joast.v65i2.2013.723
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References

  1. Datta, A., Nixon, M. and Chopra, I., "Review of Rotor Loads Prediction with the Emergence of Rotorcraft CFD", Journal of the American Helicopter Society, Vol. 52, (4), October, 2007, pp. 287-217.
  2. Kufeld, R. M., Balough, D. L., Cross, J. L., Studebaker, K. F., Jennison, C. D. and Bousman, W. G., "Flight Testing of the UH-60A Airloads Aircraft", American Helicopter Society, 50th Annual Forum Proceedings, Washington, D. C., May, 1994.
  3. Bousman, W. G. and Kufeld, R. M., "UH-60A Airloads Catalogue",NASA/TM-2005-212827, AFDD/TR-05-003, August, 2005.
  4. Bousman, W. G., "A Qualitative Examination of Dynamic Stall from Flight Test Data", Journal of the American Helicopter Society, Vol.43, (4), October, 1998, pp.279-295.
  5. Kufeld, R. M., "High Load Conditions Measured on a UH-60A in Maneuvering Flight", Journal of the American Helicopter Society, Vol. 43, (3), July, 1998, pp.202-211.
  6. Washuta, K. W. and Stocker, B. P., "Air-to-Air Combat Test (AACT II) Maneuvering Flight Loads for UH-60A and AUH-76 Helicopters", USAAVSCOM TR-86-D-1, April, 1986.
  7. Bhagwat, M. J., Ormiston, R. A., Saberi, H. A. and Xin, H., "Application of CFD/CSD Coupling for Analysis of Rotorcraft Airloads and Blade Loads in Maneuvering Flight", American Helicopter Society, 63rd Annual Forum Proceedings, Virginia Beach, VA, May, 2007.
  8. Bhagwat, M. J. and Ormiston, R. A., "Examination of Rotor Aerodynamics in Steady and Maneuvering Flight Using CFD and Conventional Methods", American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January, 2008.
  9. Abhishek, A., Datta, A. and Chopra, I., "Comprehensive Analysis, Prediction, and Validation of UH-60A Blade Loads in Unsteady Maneuvering Flight", American Helicopter Society, 63rd Annual Forum Proceedings, Virginia Beach, VA, May 1-3, 2007.
  10. Abhishek, A., Datta, A. and Chopra, I., "Comprehensive Analysis, Prediction, andValidation of UH-60A Blade Loads in Unsteady Maneuvering Flight", AHS Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 23-25, 2008.
  11. Yeo, H., "Investigation of Rotor Airloads and Structural Loads in Maneuvering Flight", American Helicopter Society, 64th Annual Forum Proceedings, Montreal, Canada, 29th April - 1st May, 2008.
  12. Sitaraman, J. and Roget, B., "Prediction of Helicopter Maneuver Loads Using A Coupled CFD/CSD Analysis", The 26th Congress of International Council of the Aeronautical Sciences, September 14-19, 2008.
  13. Thomas, S., Shreyas, A. and Baeder, J., "Wake coupling CFD-CSD Analysis of Helicopter Rotors in Steady and Maneuvering Flight Conditions", American Helicopter Society Aeromechanics Specialists’ Conference, San Francisco, January, 2010.
  14. Silbaugh, B. and Baeder, J. D., "Coupled CFD/CSD Analysis of a Maneuvering Rotor Using Staggered and Time-Accurate Coupling Schemes", American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 23-25, 2008.
  15. Abhishek, A., Datta, A. and Chopra, I., "Prediction of UH-60A Structural Loads Using Multibody Analysis and Swashplate Dynamics", Journal of Aircraft, Vol. 46, (2), March, 2009, pp.474-490.
  16. Abhishek, A., "Modelling of Large Deformations in Rotors Using Second Order Beam Model Coupled to Multibody Formulation", 17th National Seminar on Aerospace Structures (NASAS), Indian Institute of Technology, Kanpur, September 22-24, 2011.
  17. Hodges, D. H., "Geometrically Exact, Intrinsic Theory for Dynamics of Curved and Twisted Anisotropic Beams", AIAA Journal, Vol. 41, (6), June, 2003, pp.1131-1137; also "Erratum: Geometrically Exact, Intrinsic Theory for Dynamics of Curved and Twisted Anisotropic Beams", AIAA Journal, Vol.42, (7), July, 2004, p.1500.
  18. Bauchau, O. A. and Kang, N. K., "A Multibody Formulation for Helicopter Structural Dynamic Analysis", Journal of the American Helicopter Society, Vol.38, (2), April, 1993, pp.3-14.
  19. Reissner, E., "On One-Dimensional Large-Displacement Finite-Strain Beam Theory", Studies in Applied Mathematics, Vol.52, (2), April, 1973, pp.87-95.
  20. Johnson, W., "Rotorcraft Dynamics Models for a Comprehensive Analysis", 54th Annual Forum, American Helicopter Society, Washington D.C., May 20-22, 1998.
  21. Saberi, H., Khoshlahjeh, M., Ormiston, R.A. and Rutkowski, M. J., "Overview of RCAS and Application to Advanced Rotorcraft Problems", 4th Decennial Specialists’ Conference on Aeromechanics, American Helicopter Society, San Francisco, CA, January, 2004.
  22. Datta, A., "Fundamental Understanding, Prediction and Validation of Rotor Vibratory Loads in Steady-Level Flight", Ph.D. Dissertation, Department of Aerospace Engineering, University of Maryland, College Park, MD, 2004.
  23. Kufeld, R. M. and Johnson, W., "The Effects of Control System Stiffness Models on the Dynamic Stall Behavior of a Helicopter", Journal of the American Helicopter Society, Vol.45, (4), October, 2000, pp.263-269.
  24. Weissinger, J., "The Lift Distribution of Swept-Back Wings", National Advisory Committee for Aeronautics, Technical Memorandum No.1120, 1947.
  25. Leishman, J. G. and Beddoes, T. S., "A Semi-Empirical Model for Dynamic Stall", Journal of the American Helicopter Society, Vol.34, (3), July, 1989, pp.3-17.
  26. Datta, A. and Chopra, I, "Validation of Structural and Aerodynamic Modeling Using UH-60A Airloads Program Data", Journal of the American Helicopter Society, Vol.51, (1), January, 2006, pp.43-58.
  27. Ananthan, S. and Leishman, J. G., "Rotor Wake Aerodynamics in Large Amplitude Maneuvering Flight", Journal of the American Helicopter Society, Vol.51, (3), July, 2006, pp.225-244.
  28. Yoon, S. and Jameson, A., "Lower-Upper Symmetric-Gauss-Seidel Method for Euler and Navier-Stokes Equations", AIAA Journal, Vol.26, (9), 1988, pp.1025-1026.
  29. Pulliam, T., "Time Accuracy and the Use of Implicit Methods", AIAA-93-3360, 11th AIAA Computational Fluid Dynamics Conference, Orlando, FL, July, 1993.
  30. Guruswamy, G. P. and Yang, T. Y., "Aeroelastic Time-Response Analysis of Thin Airfoils by Transonic Code LTRAN2", Computers and Fluids, Vol.9, (4), December, 1980, pp.409-425.
  31. Datta, A. and Johnson, W., "An Assessment of the State-of-the-art in Multidisciplinary Aeromechanical Analyses", AHS Specialists’ Conference on Aeromechanics, San Francisco, CA, January 23-25, 2008.
  32. Tung, C., Caradonna, F. X. and Johnson, W., "Conservative Full Potential Model for Unsteady Transonic Rotor Flows", AIAA Journal, Vol.25, (2), 1987, pp.193-198.
  33. Ananthan, S., Sitaraman, J., Baeder, J. D., Hahn, S., and Iaccarino, G., "Hybrid Unsteady Simulation of Helicopters: HUSH", 26th AIAA Applied Aerodynamics Conference, AIAA-2008-7339, Honolulu, HI, August 18-21, 2008.
  34. Sitaraman, J., Datta, A., Baeder, J. D. and Chopra, I., "Fundamental Understanding and Prediction of Rotor Vibratory Loads in High-Speed Forward Flight", 29th European Rotorcraft Forum, September, 2003.

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