34th European Rotorcraft Forum 2008 (ERF34) Liverpool, United Kingdom 16-19 September 2008 Volume 1 of 3 ISBN: 978-1-61782-199-8 Printed from e-media with permission by: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 Some format issues inherent in the e-media version may also appear in this print version. Copyright© (2008) by Royal Aeronautical Society All rights reserved. Printed by Curran Associates, Inc. (2011) For permission requests, please contact Royal Aeronautical Society at the address below. Royal Aeronautical Society No. 4 Hamilton Place London W1J 7BQ United Kingdom Phone: +44 (0) 20 7670 4300 Fax: +44 (0) 20 7670 4309 www.raes.org.uk Additional copies of this publication are available from: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 USA Phone: 845-758-0400 Fax: 845-758-2634 Email: [email protected] Web: www.proceedings.com TABLE OF CONTENTS VOLUME 1 SESSION 1 PARALLEL SESSION A - SAFETY The European Helicopter Safety Team (EHEST): European Partnership for Improving Helicopter Safety ......................................................................................................................................................................................1 M. Masson, M. Van Hijum, A. Healey, J. Vincent, A. Evans PARALLEL SESSION B - AERODYNAMICS Rotorcraft Simulations Using a Sliding-grid Approach ................................................................................................... 47 O. J. Boelens, H. Van Der Ven, J. C. Kok, B. B. Prananta Higher-Order Accurate Simulations of Blade-Vortex Interaction Using a Discontinuous Galerkin Method on Unstructured Meshes ....................................................................................................................................... 76 Hee Dong Lee, Oh Joon Kwon PARALLEL SESSION C – FLIGHT MECHANICS Numerical Flow Simulations past a Bell 412 Helicopter in Real-Time Hover, Low and High Forward Speed Flight Conditions Using Chimera Grid Technique................................................................................................ 91 F. Zhang, H. Xu, N. G. Ball, A. W. Gubbels Chinook Helicopter and Slung Load Coupled Body Dynamic Simulation ................................................................... 141 K. R. Reddy, T. T. Truong, K. J. Bourne, R. A. Stuckey, N. Blacker SESSION 2 PARALLEL SESSION A – PILOT COUPLING Nonlinear Rotorcraft Pilot Coupling Analysis and Anti-windup Design ...................................................................... 177 Sebastien Kolb, Pierre-Marie Basset The Strongly Controlled Helicopter................................................................................................................................. 210 Linghai Lu, Gareth Padfield, Michael Jump PARALLEL SESSION B - AERODYNAMICS BERP IV Aerodynamics, Performance and Flight Envelope......................................................................................... 245 Kevin Robinson, Alan Brocklehurst Conservation Issues for RANS-Based Rotor Aeroelastic Simulations .......................................................................... 253 Marilyn J. Smith PARALLEL SESSION C – FLIGHT MECHANICS Rotary Wing UAV: HIL Tests for a Model-based Feedforward Controller................................................................. 295 Filippo Zanetti, Stefano Colautti, Gian Marco Saggiani, Veronica Rossi Linear Models for Integrated Flight and Rotor Control................................................................................................ 333 J. V. R. Prasad, F. E. Olcer, L. N. Sankar, C. He SESSION 3 PARALLEL SESSION A - ACOUSTICS Influence of Vortex Models on the Prediction of 2D Airfoil Vortex Interaction .......................................................... 360 S. Loiodice, D. Drikakis, A. Kokkalis Aeroacoustic Analysis of Main Rotor – Tail Rotor Interaction ..................................................................................... 370 Timothy M. Fletcher, Karthikeyan Duraisamy, Richard E. Brown Aeroacoustic Flight Test Data Analysis and Guidelines for Noise-Abatement-Procedure Design and Piloting................................................................................................................................................................................ 383 Pierre Spiegel, Frederic Guntzer, Anne Le Duc, Heino Bucholz PARALLEL SESSION B - AERODYNAMICS A Two-Grid Overset Method for the Prediction of Isolated Rotor Hover Performance ............................................. 449 Marvin A. Moulton, Mahendra J. Bhagwat, Francis X. Caradonna Computational Analysis of Rotor-fuselage Interactional Aerodynamics Using Sliding-plane CFD Method................................................................................................................................................................................ 484 R. Steijl, G. Barakos Blade-vortex Interaction Capture by CFD...................................................................................................................... 500 T. Renaud, G. Perez, C. Benoit, G. Jeanfaivre, S. Péron High Resolution Computation of the Aerodynamics and Acoustics of Blade Vortex Interaction............................... 531 Alasdair Thom, Karthikeyan Duraisamy PARALLEL SESSION C – OPERATIONAL ASPECTS Helicopter IFR Steep and Curved Approaches Using SBAS Guidance ........................................................................ 545 Thomas Lüken, Ernst Groll, Florian Antrack, Bernd Korn Relevant Aspects of Helicopter-Ship Operations ............................................................................................................ 578 A. Hoencamp, Th. Van Holten, J. V. R. Prasad Study of a Downwash Caused by a Hovering Rotor in Ground Effect ......................................................................... 589 Yasutada Tanabe, Shigeru Saito, Naoko Ooyama, Katsumi Hiraoka DLR - Onera Common Research Programme for Rotorcraft ....................................................................................... 600 Blanche Demaret, Klausdieter Pahlke SESSION 4 PARALLEL SESSION A – ROTORCRAFT-PILOT COUPLINGS Adverse Rotorcraft-Pilot Coupling: Recent Research Activities in Europe ................................................................. 644 Oliver Dieterich, Joachim Gotz, Binh Dang Vu, Henk Haverdings, Pierangelo Masarati, Marilena Pavel, Michael Jump, Massimo Gennaretti Adverse Rotorcraft-Pilot Couplings - Prediction and Suppression of Rigid Body RPC Sketches from the Work of Garteur HC-AG16........................................................................................................................................ 693 Marilena D. Pavel, Binh Dang Vu, Joachim Gotz, Michael Jump, Oliver Dieterich Adverse Rotorcraft-Pilot Coupling: Test Campaign Development at the University of Liverpool ............................ 740 M. Jump, S. Hodge, B. Dang Vu, P. Masarati, G. Quaranta, M. Mattaboni, M. D. Pavel, O. Dieterich PARALLEL SESSION B - AERODYNAMICS Computational Analysis of Orthogonal Blade Vortex Interaction ................................................................................ 787 Antonio Filippone Comparison of Finite-State Dynamic Stall Theory with Unsteady Data....................................................................... 797 Loren A. Ahaus, David A. Peters CFD For Tail Rotor Design and Evaluation.................................................................................................................... 846 Alan Brocklehurst, René Steijl, George Barakos PARALLEL SESSION C – STRUCTURES & MATERIALS Remote Synthesis of Loads on Helicopter Rotating Components using Linear Regression, Load Path and Statistical Analyses..................................................................................................................................................... 867 Xiaobo Yu, Callum Wright, Manfred Heller VOLUME 2 Robust Optimal Design of Composite Helicopter Rotor Blade Cross Section.............................................................. 915 Senthil Murugan, Ranjan Ganguli, Dineshkumar Harursampath SESSION 5 PARALLEL SESSION A - TESTING Evaluation of a Steep Curved Rotorcraft IFR Procedure in a Helicopter-ATC Integrated Simulation Test...................................................................................................................................................................................... 946 Henk Haverdings The Development of 4-blades New Rotor System for an Unmanned Helicopter with 100kg-class MTOW ............................................................................................................................................................................... 987 Deog-Kwan Kim, Keun-Woong Song, Ki-Hoon Chung, Young-Jung Kee, Sung-Ho Kim PARALLEL SESSION B - AERODYNAMICS An Approximate Unsteady Aerodynamic Model for Flapped Airfoils Including Improved Drag Predictions........................................................................................................................................................................ 1037 Li Liu, Peretz P. Friedmann, Ashwani K. Padthe High-order Simulation of a Rotor in Forward Flight Using a Four-dimensional Adaptive Flow Solver................. 1082 H. Van Der Ven, O. J. Boelens Transition Modelling for Rotorcraft CFD..................................................................................................................... 1123 Georgios Zografakis, George Barakos, Mark Johnson PARALLEL SESSION C – FLIGHT