70th American Helicopter Society International Annual Forum 2014
Montreal, Quebec, Canada
20 - 22 May 2014
Volume 1 of 4
ISBN: 978-1-63266-691-8 Printed from e-media with permission by:
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Copyright© (2014) by the American Helicopter Society International All rights reserved.
Printed by Curran Associates, Inc. (2014)
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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
Wing Commander Kenneth H. Wallis: The Triumphs, Tragedy and Enigma of an Extraordinary Life in Autogyro Aviation...... 1 B. Charnov
OpenMDAO/NDARC Framework for Assessing Performance Impact of Rotor Technology Integration...... 20 M. Avera, R. Singh
Rotor Track and Balance Improvements ...... 26 E. Bechhoefer, A. Fang, E. Garcia
Evaluation of Laminate Quality for Out of Autoclave Manufacturing for a Complex Shaped Crew Door ...... 35 E. Quinlan, J. Kratz, L. Farhang, G. Fernlund, S. Hughes, T. Centea, J. Kay, S. Hoa, A. Smith, S. Heroux, R. Desai, P. Hubert
Converged Velocity Field for Rotors by a Blended Potential Flow Method ...... 44 J. Huang, D. Peters, M. Nowak
First NICETRIP Powered Wind Tunnel Tests Successfully Completed in DNW-LLF...... 55 A. Stabellini, A. Verna, A. Ragazzi, J. Hakkaart, A. Bruin, A. Hoeijmakers, O. Schneider, M. Przybilla, H. Langer, I. Philipsen
Piezoelectric De-Icing System for Rotorcraft ...... 72 E. Villeneuve, D. Harvey, D. Zimcik, R. Aubert, J. Perron
Automating Rotorcraft Parts Life Tracking Using RF Rechargeable Semi-Passive RFID...... 82 M. Augustin, C. Sanzone, B. Coleman, N. Phan, D. Liebschutz
Development of a Neural-Network (NNET) Based Engine Model for a Two-Stroke Engine of a Rotary Wing UAV ...... 91 F. Olcer
In Search of Rotorcraft Airframe Fatigue Assessment Methodology – Cracking Prediction under Service Loading...... 98 S. Moon, N. Phan
Assessment and Calibration of Semi-Empirical Models for Predicting Pollutant Emissions of the ERICA Tiltrotor Turboshaft Engine ...... 112 L. Mas, E. Benini, R. Ponza
Handling-Qualities Based System Identification and Flight Control of an Unmanned Helicopter ...... 128 G. Wang, Y. Xiang, H. Chen, S. Han, Y. Yan
A Computational System Model for Gearbox Loss-of-Lubrication ...... 137 S. McIntyre, Q. Yu, R. Kunz, L. Chang, R. Bill
Simulation Methods used in the Development of the Quiescent Period Prediction Systems for the Royal Navy ...... 148 B. Ferrier, J. Duncan, A. Curnow, M. Belmont, J. Duncan
Semi-Empirical Physics-Based Modeling of Fuselage-Rotor and Fuselage-Wake Interferences for Comprehensive Codes ...... 161 B. Wall, A. Bauknecht, S. Jung, Y. You
Active Control of Transmission Noise In a Bell 407 Helicopter...... 174 Y. Pasco, A. Berry, A. Grewal, S. Chapleau
Segment-Wise Measurement of Helicopter Approach Noise with a Reduced Microphone Setup ...... 183 W. Olsman, B. Gursky
A Novel Parallel Algorithm for Rotor Dynamics Simulation...... 208 S. Heo, O. Bauchau
Control Loads Reduction through Control System Architecture Optimization Application to a Conventional Rotor on a Compound Helicopter...... 217 M. Paris, P. Eglin, F. Malburet, J. Carmona
Optimization of MQ-8 (Fire Scout) UAS Launch and Recovery Performance ...... 231 B. Ferrier, R. Ernst, A. Sehgal
The Bell 525 Relentless, The World’s First “Next Generation” Fly-by-Wire Commercial Helicopter ...... 245 S. Kim, M. Bothwell, R. Fortenbaugh
Comparative Bench Test Assessment of Medium Authority on-Blade Actuation Technologies...... 258 T. Schank, J. Szefi, C. Kothera
A Real Time Expert Control System For Helicopter Autorotation...... 274 Z. Sunberg, N. Miller, J. Rogers
Validation of Numerical Methods for Multi-Terrain Impact Simulations of a Crashworthy Composite Helicopter Subfloor ...... 292 T. Billac, M. David, M. Battley, T. Allen, R. Thomson, C. Kindervater, R. Das
Integrated Methods to Model and Update Rotorcraft Simulations with Experimental Data ...... 305 J. Cooper, T. Schlapkohl, E. Morelli, S. Roark, D. Gaublomme, B. Roberts, S. Xiao
Methodology for Equivalent Level of Safety Certification of U.S. Army Rotorcraft in Required Navigational Performance in Area Navigation Controlled Airspace ...... 323 C. SanFilippo, J. Lance, G. Emore, M. Gulley
Simulation of Coupled Helicopter-Slung Load-Pilot Dynamics...... 335 K. Enciu, A. Rosen
Generalized Timoshenko and Vlasov Theories for Oblique Cross-Sectional Analysis of Rotor Blades...... 362 A. Rajagopal, D. Hodges
Predictions of JVX Rotor Performance in Hover and Airplane Mode Using High-Fidelity Unstructured Grid CFD Solver ...... 382 C. Sheng
An Investigation Into the Effects of Body-Borne Equipment on Occupant Injury under Simulated Vertical Impact with Seat ‘Bottoming-Out’ ...... 397 D. Aggromito, R. Thomson, J. Wang, B. Chen, W. Yan
Predictions of Rotor and Rotor/Airframe Configurational Effects on Brownout Dust Clouds ...... 407 B. Govindarajan, J. Leishman
OH-58 Block II Control Law Upgrades...... 434 J. Shue, E. Carlson, J. Schillings, M. Bothwell
Achieving HUMS Program Financial Benefits – 12 Years of Day to Day HUMS Operations on the CH-146 Griffon Fleet...... 450 A. Heroux-Theriault
A Damage Tolerance and Fatigue Evaluation Approach for Composite Rotorcraft Airframe Structures ...... 456 A. Engleder, D. Francescatti, U. Burger
System Geometrical Management...... 463 J. Gatti, F. Martinel
Stability of Rotorcraft for Interplanetary Space Flight...... 471 S. Gibbs, J. Warren, W. Wilkie, E. Dowell
Extracting Blade Vortex Interactions using Continuous Wavelet Transforms...... 480 J. Stephenson, C. Tinney
Advanced Beam Modeling Applied to Articulated Rotor – Implementation in HOST Aeromechanic Simulation Tool...... 500 Y. Skladanek, L. Boucherie, B. Benoit, P. Cranga
Solution of Glauert’s Contraction/Expansion Equations for Wind Turbines and Powered Rotors with Swirl...... 512 D. Peters, R. Modarres, A. Howard, B. Rahming
An Alternative Approach for System Architecture Design to Ease IMA Incremental Certification and to Support Step by Step Avionics Deployment on the Fleet ...... 523 E. Guillanton, S. Germanetti
Nanolubricant Oil Additives for Performance Improvement of the Intermediate Gearbox in the AH- 64D Helicopter ...... 531 K. Gouda, J. Tarbutton, J. McVay, A. Bayoumi
Subjective and Objective Evaluation of PIO Tendencies ...... 542 M. Jones, M. Jump
Wind Tunnel Test Results for a 0.2 Scale 4-Bladed Tiltrotor Aeroelastic Model...... 558 J. Newman, T. Parham, C. Johnson, D. Popelka
Gain-Scheduled Higher Harmonic Control for Full Flight Envelope Vibration Reduction...... 570 F. Fan, S. Hall
Aerodynamic Shape Optimization of a Helicopter Main Rotor Hub Beanie using Advanced Multi- Objective Evolutionary Algorithms ...... 582 L. Mas, R. Ponza, E. Benini
Performance Characteristics of Symmetrized In-Flight Tracking Control...... 592 F. King, A. Steinwandel, W. Fichter
AFP Monocoque Composite Tailboom Full Scale Fatigue Testing...... 605 C. Beltempo, J. Rogers, R. Rutledge, A. Colle, P. Drouin, M. Lapalme
Utilizing Selective Laser Sintering for Production Fabrication of Peculiar Support Equipment...... 617 D. Przano
Safe Path Planning with Localization Uncertainty for Urban Operation of VTOL UAV...... 623 Y. Watanabe, S. Dessus, P. Fabiani
Full-Scale Experimental Validation of Dynamic, Centrifugally Powered, Pneumatic Actuators for Active Rotor Blade Surfaces ...... 636 J. Szefi, B. Cormier, L. Ionno
Design and Fabrication Elements to Unmanned Rotorcraft ILX-27...... 655 P. Gula
Physics-Based Modeling of Viscous Ground Effect for Rotorcraft Applications...... 662 J. Zhao, C. He
Blue Pulse Active Rotor Control at Airbus Helicopters - New EC145 Demonstrator & Flight Test Results...... 679 A. Rabourdin, J. Maurice, O. Dieterich, P. Konstanzer
Helicopter Noise Abatement Arrival Trajectories ...... 703 S. Hartjes, H. Visser, M. Pavel
Continuous Trailing-Edge Flaps for Primary Flight Control of a Helicopter Main Rotor ...... 714 R. Thornburgh, A. Kreshock, M. Wilbur, M. Sekula, J. Shen
Thermoplastic Rotorcraft Driveshafts Provide Weight Reduction with Improved Survivability ...... 727 J. Michasiow, Z. August, G. Ostrander, D. Hauber
Spacial Modelling and Simulation of On-Deck Helicopter Securing and Manoeuvring...... 740 M. Leveille, R. Langlois
Effect of Control System Augmentation on Handling Qualities and Task Performance in Good and Degraded Visual Environments...... 750 C. Theodore, C. Malpica, C. Blanken, M. Tischler, B. Lawrence, J. Lindsey, T. Berger
Apache Mission Processor Software Architecture: Future Airborne Capability Environment (FACETM) Considerations...... 780 R. Koontz, D. Johnson
Optimized Powerplant Configurations For Improved Rotorcraft Operational Performance ...... 793 A. Fakhre, K. Tzanidakis, I. Goulos, V. Pachidis
Aerodynamic Performance Modeling of Ducted Fans and Shrouded Propellers for Preliminary Design ...... 810 C. Stahlhut
Volume 2
Icing Wind Tunnel Test of a Full Scale Heated Tail Rotor Model ...... 823 J. Wright, R. Aubert
A Novel, High Fidelity 6-DoF Simulation Model for Tethered Load Dynamics...... 832 D. Prosser, M. Smith
Investigation of Personal Aerial Vehicle Handling Qualities Requirements for Harsh Environmental Conditions ...... 848 P. Perfect, M. Jump, M. White
The Effect Of Ship Size On The Flying Qualities Of Maritime Helicopters...... 862 P. Scott, I. Owen, M. White
Measurements of the Plume-Like Three-Dimensionality of Rotor-Induced Dust Fields...... 873 A. Sydney, J. Leishman
Ice Testing of a Centrifugally Powered Pneumatic Deicing System for Helicopter Rotor Blades ...... 893 J. Palacios, D. Wolfe, M. Bailey, J. Szefi
Design, Development, and Qualification of Computationally Designed Alloys ...... 909 J. Grabowski, J. Sebastian, A. Asphahani, C. Houser, K. Teskin, D. Snyder
Computing Industry Applications to Rotorcraft Avionics...... 917 M. Hansen, A. Augenstein
Design, Rapid Prototyping and Testing of a Ducted Fan Microscale Quadcopter...... 926 C. Hooi
Improving the Predictions of Distortions throughout Manufacturing Process of Mechanical Parts for a “One Shot” Industrialization...... 936 J. Looze, T. Caula, P. Durand, J. Feraille
Advanced CFD-Based Optimization Methods Applied to the Industrial Design Process of Airframe Components at Airbus Helicopters ...... 946 Q. Zhang, A. Garavello, A. D'Alascio, D. Schimke
Numerical Investigation of Three-Dimensional Dynamic Stall on an Oscillating Finite Wing ...... 959 K. Kaufmann, M. Costes, F. Richez, A. Gardner, A. Pape
A Performance Analysis of Compound Helicopter Configurations...... 971 K. Ferguson, D. Thomson
Reusable Energy Absorbing Lab (REAL) Seat...... 984 M. Knott, B. Hall
Condition Monitoring of Helicopter Drivetrain Components Using Bispectral Analysis...... 995 M. Hassan, D. Coats, A. Bayoumi
Vehicle-Level Optimization of Rotorcraft Propulsion Systems ...... 1003 O. Ohanian, P. Gelhausen, A. Entsminger, C. Dunn, C. Sonnenburg
Conducting Helicopter Operations in Northern Labrador and the Arctic...... 1011 G. Goodyear
Boundary Layer Transition Measurements on Hovering Helicopter Rotors by Infrared Thermography ...... 1017 K. Richter, E. Schulein
Bell 412EPI Engine and Glass Cockpit Upgrade ...... 1030 J. Schillings, B. Thomas, E. Oltheten, H. Runge, J. Greenwood, D. Sowers
Benchmarking of UAV Guidance Systems in Nap of the Earth (NOE) Flight ...... 1056 E. Johnson, D. Bershadsky
Study of Processing Conditions on the Forming of Ribbed Features using Randomly-Oriented Strands Thermoplastic Composites...... 1062 D. LeBlanc, B. Landry, A. Levy, S. Roy, A. Yousefpour, E. Quinlan, P. Hubert
Advanced Approaches to Helicopter Engine System Dynamics ...... 1071 E. Ho, G. Begin, H. Smailys
Time Domain Modeling of Geometrically Nonlinear Viscoelastic Beams for Rotor Blades...... 1076 H. Kang, B. Glaz, M. Floros
Transitioning to MBSD in a Large Systems Engineering Organization that Develops Complex Mission System for Helicopters ...... 1085 S. Felter
Investigation of RCAS–CAMRAD II UH60 Structural Dynamics Model Correlation ...... 1092 B. Silbaugh, H. Kang, M. Floros, R. Singh
CFD Modelling of Gas Turbine Combustor Post-Shutdown: Heat Soak-Back Phenomenon...... 1119 M. Ghazlani, A. Champlain, B. Paquet, S. Kalla, N. Davenport
Analysis of Impact Behavior of Thick Rotorcraft Composite Components: Approach and Implementation...... 1125 M. Gurvich, P. Rao, P. Clavette, B. Bouquillon, M. Davis
UH-60 Partial Authority Modernized Control Laws for Improved Handling Qualities in the Degraded Visual Environment...... 1133 B. Fujizawa, M. Tischler, C. Ott, C. Blanken
Integrated Optimization Analyses on Aerodynamic/Stealth Characteristics of Helicopter Rotor Based on Surrogate Model ...... 1146 X. Jiang, Q. Zhao, G. Zhao, P. Li
Aerodynamic Shape Optimization for Alleviating Dynamic Stall Characteristics of Helicopter Rotor Airfoil...... 1159 Q. Wang, Q. Zhao, Q. Wu
Blade Property Measurement and Its Assessment on Air/Structural Loads of HART II Rotor...... 1172 S. Jung, Y. You, M. Dhadwal, B. Hagerty, J. Riemenschneider, R. Keimer
Numerical Analyses for Aerodynamic and Noise Characteristics of Helicopter Scissors Tail Rotor ...... 1186 Z. Zhu, Q. Zhao
Investigation of Three-Dimensional Dynamic Stall on an Airfoil using Fast Response Pressure Sensitive Paint...... 1199 A. Gardner, C. Klein, W. Sachs, U. Henne, H. Mai, K. Richter
Experimental Investigation on a 1/4 Scaled Model of an High–Performance Tiltwing Aircraft in Hover ...... 1211 G. Droandi, A. Zanotti, G. Gibertini, G. Campanardi, D. Grassi
Advanced Multi Axis Trim and Drill Cell for Low Volume, Multiple Part Configuration in a JIT Environment ...... 1227 A. Laird
Contribution to the Study and Design of an Electro-Thermal De-Icing/Anti-Icing System Applied to Rotorcraft...... 1234 M. Boussetoua, J. Perron, M. Ouhrouche
Unsteady Blade Shape Optimization for Rotorcraft...... 1243 V. Ahuja, C. Kannepalli, A. Zambon, H. Lapin, M. Potsdam
A Multilayered Approach for Enhancing Rotorcraft Drive System Diagnostics ...... 1259 J. Sheldon, D. Kasper, M. Davis
Enabling Sustainable Engine Design LCA and Ecodesign Strategies ...... 1271 S. Hendershot
Effects of Contrast and Spatial Frequency on Idealized Compensatory Tasks...... 1279 D. Brown, R. Celi
Three-Dimensional CAD-Based Structural Modeling for Next Generation Rotor Dynamic Analysis...... 1301 W. Staruk, I. Chopra, A. Dadda
Engine Corrosion and Corrosion Prevention...... 1315 R. Pobjoy
Tactics, Techniques, and Procedures to Extend Component Remaining Useful Life Based on Aircraft Maneuvers...... 1321 K. Conrad, A. Love, D. Doubet, B. Tucker, J. Marin
Applications of Virtual Monitoring of Loads to Engineering Decision Making...... 1334 R. Beale
Airframe Structural Integrity Management: A UH-60 Application and Demonstration...... 1344 A. Brookhart, N. Bordick, P. Bates
Aircraft Survivability Rating...... 1358 J. Kaye, M. Robeson, N. Bordick
Turboshaft After-Market positioning: A Strategy Based Approach...... 1362 P. Carpentier
Integrated Aeromechanics with Three-Dimensional Solid-Multibody Structures...... 1365 A. Datta, W. Johnson
H2 Periodic Control on Active Twist Rotor for Vibration Reduction ...... 1386 C. Brillante, M. Morandini, P. Mantegazza
Explorations of Novel Powerplant Architectures for Hybrid Electric Helicopters...... 1394 V. Nagaraj, I. Chopra
Development and Testing of Optimized Instrument Flight Rules (IFR) Noise Abatement Procedures on EC155 ...... 1422 F. Guntzer, M. Gervais, V. Gareton, P. Rollet
Conduction Heating for Adhesive Bonding of Rotorcraft Primary Structure ...... 1440 S. Hind, J. Verdino, D. Djokic, A. Yousefpour
Dynamics FEM Correlation Using Structural Optimization Tools...... 1445 S. Chapleau, M. Seifert, M. Couture
Modeling the Airwake in Helicopter Ship Landing Operations from a Control Perspective...... 1461 T. Ngo, C. Sultan
Rotor Structural Loads Analysis Using Coupled Computational Fluid Dynamics/Computational Structural Dynamics...... 1473 H. Yeo, M. Potsdam
Turbulence Transport Phenomena in the Wakes of Wind Turbines ...... 1499 P. Jha, E. Duque, J. Bashioum, S. Schmitz
Effects of Structural Properties on Rotor Airloads Prediction Based on CFD/CSD Coupling Method...... 1515 J. Wang, Q. Zhao
Real-Time Simulation of Rotorcraft Downwash in Proximity of Complex Obstacles using Grid-Based Approaches...... 1527 L. Friedmann, P. Ohmer, M. Hajek
Hydraulic System Internal and External Leakage Diagnostics ...... 1543 M. Smith, J. Kloda, J. Friel
Impact Tests and Simulations of Crashworthy Composite Structures Using Variable Load Concept ...... 1557 T. Hou, G. Pearce, M. David, D. Kelly, G. Prusty, R. Thomson
Propulsion System Diagnostic and Reasoning Technology Development ...... 1569 N. Mackos, B. LeFevre, J. Friel, T. Baker
A Parametric Study of On-Blade Control Device Performance for Helicopter Vibration and Noise Reduction...... 1580 M. Chia, A. Padthe, P. Friedmann
A Computational Framework for Helicopter Fuselage Drag Reduction Using Vortex Generators...... 1595 J. Boniface
A Redundant Aircraft Attitude System Based on Fuzzy Logic Data Fusion of the Miniaturized Inertial Sensors ...... 1611 T. Grigorie, D. Sandu, R. Botez
Analysis of Health and Usage Monitoring System (HUMS) Users’ Perspective towards Mission Benefits Using Regression Analysis...... 1621 T. Zaman, A. Bayoumi
Fail-Safe Magnetorheological Energy Absorber for a Vertically Stroking Crashworthy Seat Suspension...... 1627 W. Hu, N. Wereley, G. Hiemenz, M. Murugan, J. Yoo
Volume 3
Select Human-Machine-Interface Properties for Cockpit Installed Touchscreen Displays ...... 1636 T. Robinson, J. Green, S. Humphrey, G. Grabski, M. Jacobson
Dynamic Stall Life Cycle On A Rotating Blade In Steady Forward Flight ...... 1644 V. Raghav, N. Komerath
Design and Development of the Atlas Human-Powered Helicopter ...... 1658 C. Robertson, T. Reichert
Faith of our Father Igor Sikorsky's Eternal Legacy...... 1670 R. Beggs, I. Sikorsky
Design Space Exploration of Gyrocopter-Type AirborneWind Turbines ...... 1677 D. Rancourt, F. Bolduc-Teasdale, E. Bouchard, M. Anderson, D. Mavris
Development of Thermoplastic Composite Cones for Helicopter Tail Boom Application ...... 1689 S. Hoa, F. Shadmehri, X. Cai, J. Simpson, M. Hojjati, J. Chen, P. Hubert, E. Quinlan, X. Brulotte, V. D'Arienzo, P. Beaulieu, M. Dion
Manufacturing of Composite Helicopter Tailboom Using AFP Process...... 1699 J. Chen, M. Octeau, S. Roy, A. Yousefpour, R. Gingras, P. Beaulieu, K. Morris
Subjective and Objective Metrics for the Evaluation of Motion Cueing Fidelity for a Roll-Lateral Reposition Maneuver...... 1706 C. Wiskemann, F. Drop, D. Pool, M. Paassen, M. Mulder, H. Bulthoff
Frequency Domain System Identification of a Light Helicopter in Hover...... 1721 S. Geluardi, F. Nieuwenhuizen, L. Pollini, H. Bulthoff
Joint Common Architecture (JCA) Recommendations...... 1732 T. DuBois, W. Kinahan, F. Dones
Performance and Flowfield Measurements of a MAV-Scale Helicopter Rotor in Hover...... 1740 M. Benedict, J. Winslow, Z. Hasnain, I. Chopra
Method to Allocate Vehicle Health Management Analytics to Subsystems for Maintenance Credit ...... 1762 K. Conrad, J. Oliver
Motion Feedback Improves Performance in Teleoperating UAVs...... 1777 J. Lachele, J. Venrooij, P. Pretto, H. Bulthoff
Vertical Lift Aircraft Rotor and Blade Mechanical and Dynamic Fault Detection in the field through the use of Revolution to Revolution Blade Track Data Analysis ...... 1785 G. Mesec
Investigation of Probabilistic Failure Predictions with Progressive Damage in Composites ...... 1794 R. Haynes, C. Shiao, T. Chen
Seeded-Fault Spin-Testing of an Active Rotor Electromechanical Actuator and Mechanism...... 1801 C. Matalanis, A. Kuczek, U. Jonsson, S. Kim, Z. Chaudhry, B. Wake, P. Brewer
An Evaluation of Three Technologies for Rotating/Non-Rotating Data Transfer ...... 1809 C. Matalanis, N. Soldner, S. Bajekal, U. Jonsson, V. Lakamraju, B. Wake, J. Moore, M. Piet, M. Scott
Combustion-Powered Actuation for Dynamic Stall Suppression – Simulations and Low-Mach Experiments ...... 1817 C. Matalanis, B. Min, P. Bowles, S. Jee, B. Wake, T. Crittenden, G. Woo, A. Glezer
Bearing Fault Diagnosis Using A Spectral Average Based Approach...... 1831 B. Hecke, E. Bechhoefer, Y. Qu, D. He
Assessment of Ice Accretion Effects on Rotor Dynamics via Multi-Body and CFD Approaches ...... 1840 D. Kelly, H. Fouladi, M. Fossati, W. Habashi, R. Alicino, G. Quaranta, P. Masarati
V-22 and the Future of Carrier Onboard Delivery (COD): Improving the Way the Navy Re-Supplies its Carriers and Maritime Forces...... 1852 K. Karika, B. Roby, J. Barber
A New Finite-Difference Method for General Long-Range Rotorcraft Acoustics: Initial Comparisons with Intermediate-Range Data ...... 1857 S. Chitta, J. Steinhoff, A. Wilson, F. Caradonna, B. Sim, L. Sankar
Helicopter Flight Test of the Obscurant Penetrating Autosynchronous Lidar (OPAL) in Degraded Visual Environments: Part II – See-through Capability Assessment...... 1870 G. Roy, S. Roy, X. Cao
Structural Health Sensing of Damage Precursors using Magnetostrictive Particles Embedded in Composite Structures ...... 1877 A. Hall, M. Haile, J. Yoo, R. Haynes, M. Coatney
Several Nominal Distances for Rotorcraft Gaussian Process Metamodels in the Presence of Categorical Alternatives...... 1884 J. Rio, D. Mavris
Experimental Characterization of a Tailboom with Fluidic Flexible Matrix Composite Tubes...... 1894 K. Miura, M. Krott, E. Smith, C. Rahn, P. Romano
Assessing the Fidelity of a Human-in-the-Loop Helicopter Flight Research Simulator ...... 1901 S. Manso, K. Bourne
CFD Calculations on the Unsteady Aerodynamic Force of Tilt-Rotor in Conversion Mode ...... 1907 P. Li, Q. Zhao, Q. Zhu
Three-Dimensional Reconstruction of Blade Tip Vortices of a BO 105 using a Multi-Camera BOS System...... 1919 A. Bauknecht, B. Ewers, C. Wolf, F. Leopold, M. Raffel
Lessons Learned from NH90 NFH Helicopter-Ship Qualification Testing across the Entire Dutch Fleet...... 1931 L. Hoencamp, D. Lee, M. Pavel, D. Stapersma
Acoustic Assesment of 3 Meter Radius Rotor with Whirl Tower Test and Analysis ...... 1944 A. Yucekayali, E. Ayan, Y. Ortakaya
Flight Testing of an In-Flight Tuning System on a CH-53G Helicopter ...... 1953 U. Arnold, D. Fuerst, S. Hartmann, A. Hausberg
HUMS & CBM in the Civil Helicopter Market ...... 1968 F. Hoffmann, G. Wurzel, S. Hasbroucq
Development of a Helicopter Hydroformable Skid Landing Gear Cross Tube...... 1982 X. Elie-Dit-Cosaque, S. Bernier, A. Gakwaya, J. Levesque, M. Guillot, J. Blanchet-Letourneau
A Novel Gear Condition Monitoring Method based on Transient Impulse Response...... 1997 Y. Chen, Z. Chaudhry, P. Dempsey
The Application of Helicopter Health and Usage Monitoring Techniques within the Wind Turbine Industry ...... 2003 C. Murray, P. Morrish, M. Asher, N. Lieven, M. Mulroy, C. Ng
Development of an Attitude Control System For a Large Scale Multicopter VTOL Aircraft...... 2013 R. Jehangir
3D-LZ Flight Test of 2013: Landing an EH-60L Helicopter in a Brownout Degraded Visual Environment ...... 2023 Z. Szoboszlay, B. Fujizawa, C. Ott, J. Savage, S. Goodrich, R. McKinley, J. Soukup
V-22 Dynamic Components Fatigue Design Usage Spectrum vs. Fleet Usage History ...... 2043 S. Kelly
Eliminating Avoidable Helicopter Seating-Related Injuries to Improve Combat Readiness and Mission Effectiveness1 ...... 2051 R. Healing, K. Hamon
UH-60A Rotor Tip Vortex Prediction and Comparison to Full-Scale Wind Tunnel Measurements ...... 2063 M. Potsdam, B. Jayaraman
Blade Displacement Predictions for the Full-Scale UH-60A Airloads Rotor...... 2084 R. Biedron, E. Lee-Rausch
Analysis of Vertical AxisWind Turbine Aerodynamics by Using a Multi-Fidelity Approach ...... 2101 Y. Han, J. Sitaraman, Y. Dan
Effects of Motion Filter Parameters on Simulation Fidelity Ratings ...... 2112 S. Reardon, S. Beard, B. Aponso
Development of Control Strategies and Flight Testing of a Twin-Cyclocopter in Forward Flight...... 2124 E. Shrestha, V. Hrishikeshavan, M. Benedict, D. Yeo, I. Chopra
Operating Strategies and Design Recommendations for Mitigating Local Damage Effects in Offshore Turbine Blades...... 2145 P. Richards, D. Griffith, D. Hodges
Learning Optimal Guidance Behavior in Unknown Environments within Receding Horizon Planning...... 2158 A. Verma, B. Mettler
Rotor Resonance Disturbance Rejection Controller...... 2169 R. Pedrami
Portable Peening Capabilities in Maintenance, Repair, and Overhaul Environments using Ultrasonic Shot Peening...... 2174 K. McClurg, R. Buckner, O. Briere, F. Chateau
Simulation Testing of Advanced Response Types for Ship-Based Rotorcraft...... 2180 G. Soneson, J. Horn
Stability, Control, and Simulation of a Dual Lift System Using Autonomous R-MAX Helicopters...... 2195 M. Berrios, M. Tischler, L. Cicolani, J. Powell
Prediction of the Thermo-Fluids of Gearbox Systems...... 2214 M. Yazdani, F. Sun, M. Soteriou, Z. Chaudhry
An Assessment of RCAS Performance Prediction for Conventional and Advanced Rotor Configurations ...... 2222 R. Jain, H. Yeo, J. Ho, M. Bhagwat
Real-Time Simulation of Coaxial Rotor Configurations with Combined Finite State DynamicWake and VPM ...... 2244 J. Zhao, C. He
Numerical Investigations of Upwind and Downwind NREL 5MW Reference Wind Turbines Using CFD and CSD ...... 2256 Q. Zhao, J. Ickes, C. Sheng, A. Afjeh
Compression Molding of Composite Tailboom Frames ...... 2272 S. Roy, A. Yousefpour, F. Bednar, P. Beaulieu
A Simple Short-Term Solution to Helicopter Spatial Disorientation During Operations in Degraded Visual Environments ...... 2277 B. McGrath, S. Drakunov, J. McKay, J. Ramiccio, A. Rupert
Application of rFlow3D Code to Performance Prediction and the Wake Structure Investigation of Wind Turbines ...... 2285 H. Oe, Y. Tanabe, M. Sugiura, T. Aoyama, Y. Matsuo, H. Sugawara, M. Yamamoto
Multi Fidelity Analysis and Design of Ducted Micro Scale Rotor Systems...... 2294 A. Singh, K. Duraisamy
50 Years After the Bo46 First Flight–Would we Do Better Now? ...... 2306 M. Hajek, M. Mindt
UnderstandingWind TurbineWake Breakdown using CFD...... 2315 M. Carrion, M. Woodgate, G. Barakos, R. Steijl
Investigation of Novel Concepts for Control of a Personal Air Vehicle ...... 2329 M. Jones, P. Perfect, M. Jump, M. White
A Portable Display for Evaluating Handling Qualities in Shipboard Hover...... 2345 S. Roark, D. Mitchell, G. Molinaro
Helicopter Fuselage Active Flow Control in the Presence of a Rotor...... 2354 P. Martin, A. Overmeyer, P. Tanner, J. Wilson, L. Jenkins
Cyclogyro Thrust Vectoring for Anti-Torque and Control of Helicopters...... 2381 L. Gagnon, M. Morandini, G. Quaranta, V. Muscarello, G. Bindolino, P. Masarati
Chordwise Implementation of Pneumatic Artificial Muscles to Actuate a Trailing Edge Flap ...... 2395 R. Vocke, C. Kothera, N. Wereley
Comparison of Simulator Platform and Flight Tasks on Adverse Rotorcraft Pilot Coupling Prediction...... 2407 L. Lu, M. Jump, M. Jones, D. Yilmaz, M. Pavel
Comparison of Mobile Aircrew Restraint Strategies in a Full-Scale CH-46 Airframe Crash Test ...... 2424 L. Bark
Rotor Wireless Load and Motion Monitoring Sensor Network...... 2433 S. Bajekal, B. Bouquillon, N. Soldner, M. Davis, C. Tokgoz, A. Marchiori
Aircraft Wire Fault Detection and Isolation using Spread Spectrum Time Domain Reflectometry...... 2441 B. Drost, M. Mastrianni, B. Thompson
Volume 4
Numerical Examination of a Model Rotor in Brownout Conditions...... 2450 B. Kutz, T. Gunther, A. Rumpf, A. Kuhn
Non-Metallic Debris Monitor For a Helicopter Transmission...... 2462 A. Chavez, J. Fetty, J. Gerardi
Robust Anti-Windup Design for Active Trailing Edge Flaps in Active Rotor Applications ...... 2475 R. Morales, M. Turner
Reversible Airfoils for Stopped Rotors in High Speed Flight ...... 2482 R. Niemiec, G. Jacobellis, F. Gandhi
Airframe Active Vibration-Based Damage Detection and Localization...... 2497 J. Long, S. Conlon
Low-Dimensional Characteristics of Tip Vortices from a Coaxial...... 2511 S. Mula, C. Cameron, C. Tinney, J. Sirohi
Design, Development, and Hover Testing of a Helicopter Rotor Blade Chord Extension Morphing System...... 2524 F. Gandhi, E. Hayden
Methods and Techniques for Analysis of Field Data for Commercial Rotorcraft Components ...... 2545 R. Muniz, M. Neus
Performance of CH-46 Pilot Seats in NASA Full-Scale Crash Test ...... 2557 A. Harris, L. Bark
Evaluation of Rotor Structural Characteristics Based on Whirl Tower Tests ...... 2568 B. Ergul, Y. Ulu, G. Tursun
Unsteady Boundary Layer Transition Measurements by Differential Infrared Thermography...... 2577 C. Merz, K. Richter, M. Raffel
Ground Resonance and Whirl Stability Analysis Using CAMRAD...... 2586 L. Liu, V. Anand, K. Hair, F. Straub
Improving Wear and Fretting Characteristics of a Rotorcraft Transmission Bearing and Case Interface with Fiber Reinforced Aluminum (FRA) Liners ...... 2597 D. Owen, S. Gardner, B. Modrzejewski, J. Fetty, K. Karg
Optimum Design of Compound Helicopters Using Higher Harmonic Control...... 2607 E. Giovanetti, K. Hall
A Physics-Based Approach to Trim Optimization of an Articulated Slowed-Rotor Compound Helicopter in High-Speed Flight...... 2619 J. Reddinger, F. Gandhi
Collaborative Search and Pursuit for Autonomous Helicopters...... 2638 E. Johnson, J. Mooney
Performance and Vibratory Hub Loads of a Mach-Scale Coaxial Rotor in Hover ...... 2647 C. Cameron, A. Karpatne, J. Sirohi
Expanded Fatigue Damage and Load Time Signal Estimation for Dynamic Helicopter Components Using Computational Intelligence Techniques...... 2656 C. Cheung, B. Rocha, J. Valdes, M. Kotwicz-Herniczek, A. Stefani
Ground and Flight Testing of a Hub Mounted Vibration Suppression System ...... 2666 J. Andrews, W. Welsh, R. Altieri, J. DiOttavio
Scaling Effects in Guidance Systems and their Benchmarking: The Agility Scale Ratio ...... 2674 B. Mettler, A. Verma
Quantification of Rotor Surface Roughness due to Ice Accretion via Broadband Noise Measurement...... 2680 B. Cheng, Y. Han, K. Brentner, J. Palacios, P. Morris
Securing a Safe Firing Envelope for the Qualification of a Gun Installation on a Helicopter ...... N/A N. Munninghoff, J. Vorst, K. Zeilstra
Adaptive Distributed Aviation Asset Optimization for Operational Effectiveness (Phase II)...... 2705 J. Merrihew, L. Lafferty, C. Shepard, N. Geddes, S. Toney
A Higher-Order Free-Wake Method for a Helicopter Rotor in Forward Flight Using Distributed Vorticity Elements ...... 2720 T. Choephel, M. Maughmer
External Load Stabilization Control Laws For An H-6 Helicopter Testbed ...... 2729 B. Patterson, C. Ivler, P. Hayes
Phase Gradient Approach for Internal Damage Mapping of Rotorcraft Components ...... 2754 A. Darnton, M. Ruzzene
Managing Certification for Software & AEH on Military Programs ...... 2763 S. Lenahan
Genetic Algorithm Based Aerodynamic Shape Optimization Tool for Wind Turbine Blades and its Implementation to Helicopter Blades...... 2774 O. Polat, N. Sezer-Uzol, I. Tuncer
Dependence of Vibration Characteristics on Grease Service Levels in an AH-64D Intermediate Gearbox ...... 2786 T. Edwards, A. Patterson, E. Ballentine, A. Bayoumi
The Model 107-II Helicopter: 50 Years of Tandem-Rotor Excellence ...... 2794 R. Roedts
Experimental Study of the Environmental Flow-field of Two Impinging Model Scale Jets...... 2800 L. Myers, N. Rudenko, D. McLaughlin
Readiness Integration Center (RIC): Increasing Safety, Improving Maintenance & Decreasing Cost ...... 2818 P. Holveck, L. Armijo, J. Camacho
Predicted Performance of an Optimized Energy-Absorbing Crashworthy Seat During Idealized and Actual Crash Pulses...... 2824 M. Richards
A Historical Investigation of the Mission Requirements and Enabling Technologies Influencing the Development of Unmanned Rotary-Wing Aircraft...... 2846 S. Bruce, J. Pereira
The Planner Ensemble and Trajectory Executive: A High Performance Motion Planning System with Guaranteed Safety ...... 2872 S. Choudhury, S. Arora, S. Scherer
Coupled CFD/CSD-Based Aeroelastic Analysis with Flowfield Measurements of Avian-Based Flexible Flapping Wings for MAV Applications ...... 2892 D. Mayo, J. Lankford, M. Benedict, I. Chopra
Development of a Visual Landing Profile with Natural-Feeling Cues...... 2917 L. Lu, M. Jump, P. Perfect, M. White
Piloted Simulation Evaluation of a Robust Feedback Controller for Helicopters Handling Externally Slung Loads...... 2929 J. Rigsby, J. Horn
Display Symbology for a Rotary-Wing Air Racer ...... 2942 R. Lamour, K. Feigh
Investigation of Aerodynamic Interactions in Ducted Rotor Systems...... 2951 R. Singh, B. Jimenez, M. Avera
Helicopter Downwash Effects on Ship Airwake: Predictions, Modeling from a Database, and Simulation ...... 2958 K. Schau, G. Gaonkar, S. Polsky
Terrain and Obstacle Avoidance Displays for Low-Level Helicopter Operations in Degraded Visual Environments...... 2975 A. Kahana, B. Sweet, Z. Szoboszlay, M. Rottem-Hovev
Technology Identification for a High Performance Tailsitter VTOL Aircraft...... 2986 M. Avera, H. Kang, R. Singh, M. Floros
Development of a Finite State Model for a Coaxial Rotor in Forward Flight ...... 2994 M. Nowak, J. Prasad, D. Peters
Investigation of Ship Airwakes Using a Hybrid Computational Methodology...... 3001 E. Quon, P. Cross, M. Smith, N. Rosenfeld, G. Whitehouse
Time-Dependent Adjoint-Based Aerodynamic Shape Optimization Applied To Helicopter Rotors...... 3015 A. Mishra, K. Mani, D. Mavriplis, J. Sitaraman
“Fatigue-Free” Platforms: Vision for Army Future Rotorcraft...... 3035 D. Le, J. Riddick, V. Weiss, B. Miller, N. Bordick
Compressible Dynamic Stall of an SSC-A09 Airfoil Subjected to Coupled Pitch and Freestream Mach Oscillations ...... 3049 K. Hird, M. Frankhouser, J. Gregory, J. Bons
On the Role of Cable Curvature in Rotorcraft-based Tow Operations for Submerged Loads...... 3062 A. Sridharan, R. Celi
Use of Redundant Controls to Enhance Transient Response and Handling Qualities of a Compound Rotorcraft...... 3085 A. Thorsen, J. Horn, G. Ozdemir
Testing-Based Approach to Determining the Divergence Speed of Slung Loads ...... 3099 A. Forbes, S. Pirau, B. Liberi, N. Komerath
Guidance for Slung Load Operations through Differential Dynamic Programming ...... 3111 G. Torre, E. Johnson, E. Theodorou
Dynamic View for Exercising Product Development Functions During Integrated Product and Process Development...... 3122 D. Schrage
New Robust Control Analysis Methodology for Lynx Helicopter and Cessna Citation X Aircraft using Guardian Maps, Genetic Algorithms and LQR Theories Combinations...... 3138 G. Ghazi, R. Botez
Gurney Flap Control Authority on a Pitching Wind Turbine Airfoil...... 3147 P. Nikoueeyan, J. Strike, A. Magstadt, M. Hind, J. Naughton
An Assessment of the Long-Age Unsteady Rotor Hub Wake Physics for Empennage Analysis...... 3162 D. Reich, S. Schmitz, R. Shenoy, M. Smith
Structures Perspective for Strength and Fatigue Prognosis in Composites...... 3176 G. Seon, Y. Nikishkov, A. Makeev
Understanding In-Plane Noise and Loading for Active Noise Control ...... 3187 T. Yang, K. Brentner, E. Corle, S. Schmitz
Hydrodynamic Characterization of a Sonar Body for Rotorcraft-Based Towing...... 3205 J. Falls
Providing a Systems Approach for Digital Manufacturing and Design Innovation...... 3213 D. Schrage
A Principled Approach to Enable Safe and High Performance Maneuvers for Autonomous Rotorcraft ...... 3228 S. Arora, S. Choudhury, D. Althoff, S. Scherer
Adverse Rotorcraft-Pilot Couplings – Modelling and Prediction of Rigid Body RPC: Sketches from the Work of European Project ARISTOTEL 2010-2013 ...... 3237 M. Pavel, D. Yilmaz, B. Vu, M. Jump, L. Lu, M. Jones
Author Index