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Athena Helicopter Detailed in This Report Is an Example of Such a Helicopter

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Athena Helicopter Detailed in This Report Is an Example of Such a Helicopter 25th Annual Student Design Competition Graduate Category Athena Athena Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology Atlanta, Georgia 30332 Acknowledgements We would like to recognize and thank the following individuals for their special assistance in the completion of this design project: Dr. Daniel Schrage Dr. Robert Loewy Dr. JVR Prasad Dr. Lakshmi Sankar Dr. Mark Costello Dr. Han Gil Chae Dr. Byung-Ho Ahn Dr. Jae-Woo Lee Dr. Yung Yu Dr. Suresh Kannan Dr. Patrick Biltgen Dr. Sandeep Agarwal Dr. Jieun Ku Pervine Dr. Haiying Liu MAJ Stephen Suhr CPT Joseph Davis Mr. Jeremy Bain Mr. Shai Birmaher Mr. Emre Gündüz Mr. Ho-Jung Kang Mr. Jeonghwan Lee Mr. Kyle Collins Mr. Jongki Moon Mr. Pete Hart Mr. Tom Hanson Mr. Kshitij Shrotri Mr. Bill Sung Mr. Apinut Sirirojvisuth Mr. Bernard Laurendeau Ms. Ashlie Brown 2008 Georgia Tech Graduate Design Team __________________________________ __________________________________ Jacquelyn Banas (BS Student, Georgia Tech) Thomas Cooper (MS Student, Georgia Tech) __________________________________ ___________ _______________________ Jonathon Crim (MS Student, Georgia Tech) James Liu (PhD Student, Georgia Tech) __________________________________ __________________________________ John Martin (BS Student, Georgia Tech) CPT Joe Minor (MS Student, Georgia Tech) __________________________________ __________________________________ F. Ersel Olcer (PhD Student, Georgia Tech) Nick Powell (BS Student, Georgia Tech) __________________________________ ______ ____________________________ Alexander Robledo (BS Student, Georgia Tech) Roosevelt Samuel (MS Student, Georgia Tech) _____________________________________ _____________________________________ Ngoc Anh Vu (MS Student, Konkuk University) CPT Brian Wade (MS Student, Georgia Tech) For participating in the 2008 AHS design competition, graduate students received academic credit for AE6334: Rotorcraft Design and undergraduate students received academic credit for AE4351: Rotorcraft Design . Executive Summary For a new helicopter to succeed in today’s and future markets, it must be capable of performing multiple missions for a variety of customers. This aircraft must be able to complete every mission efficiently and inexpensively, while also meeting or exceeding all emissions and noise regulations. This new helicopter must also be environmentally friendly. In order to meet this requirement, new technologies must be implemented and closely integrated to create an optimized robust design. The Athena Helicopter detailed in this report is an example of such a helicopter. The Athena incorporates a number of innovative and modern technologies and combines them to safely and effectively take full advantage of their benefits, while minimizing their cost and environmental impacts. It is a truly a “SMART-COPTER” that exhibits the characteristics necessary for success through its entire lifecycle. Throughout the design an Integrated Product and Process Development (IPPD) methodology was used for conducting tradeoffs to find optimal solutions. This approach focused on the heart or “core” of the helicopter – the main rotor system, the power generation system, and the control system. Based on its simplicity and unique control characteristics, the Hanson elastic articulated (EA) hub was selected for use. The EA’s flex beam design and near 1/rev feathering frequency allow the use of rotating electromechanical actuators (EMAs) for primary (cyclic and collective) and Higher Harmonic Control (HHC) through Individual Blade Control (IBC). The HHC provides the Athena with numerous benefits in the form of power reduction, vibration reduction, and noise reduction. The redundant fly-by-wire design provides flexibility in flight control augmentation and allows for advanced control implementation, including envelope protection and trajectory optimization. A new combustor designed for the optimized turboshaft engine reduces emissions and provides fuel flexibility for transition to lower emission biofuels. The engine’s distributed FADEC increases safety and reliability while also optimizing fuel consumption based on fuel type and mission profile. Between the engine and transmission, a dual speed unit provides the ability to lower the rotor speed 8% to reduce noise and power requirements, or to maintain 100% RPM for increased maneuvering ability and/or high speed flight. At the center of the Athena design is an open control platform (OCP) that provides an open system architecture and a common interface for the flight management computer, FADEC engine controls, helicopter sensors, Health Usage and Monitoring System (HUMS), RPM variation, flight controls and pilot interfaces. This distributed integration allows for all of the Athena’s advanced technologies to be managed and optimized to achieve the best possible performance based on mission requirements. This “Smartness” makes the Athena a truly robust design, capable of minimizing energy consumed while adapting to multiple missions without the loss of performance or safety. Table of Contents ACKNOWLEDGEMENTS ....................................................................................................................... I EXECUTIVE SUMMARY .......................................................................................................................II TABLE OF CONTENTS ........................................................................................................................ III LIST OF FIGURES ................................................................................................................................VII LIST OF TABLES..................................................................................................................................... X LIST OF SYMBOLS AND ABBREVIATIONS ..................................................................................XII PROPOSAL REQUIREMENTS MATRIX ........................................................................................XVI TABLE OF PHYSICAL DATA ................................................................................................................1 DIAGRAM SHEET 1 - THREE-VIEW....................................................................................................2 DIAGRAM SHEET 2 - AIRCRAFT PROFILE ......................................................................................3 DIAGRAM SHEET 3 – ENGINE CENTERLINE SCHEMATIC.........................................................4 DIAGRAM SHEET 4 – DRIVE TRAIN SCHEMATIC.........................................................................5 1 INTRODUCTION ...............................................................................................................................6 2 REQUIREMENTS ANALYSIS .........................................................................................................7 2.1 HELICOPTER MISSION ANALYSIS ...................................................................................................8 2.2 OVERALL DESIGN TRADE STUDY APPROACH ................................................................................9 2.2.1 Quality Function Deployment Matrix.....................................................................................9 2.3 OVERALL EVALUATION CRITERION .............................................................................................11 2.3.1 Mission Capability Index ......................................................................................................12 2.3.2 Safety Evaluation Criterion...................................................................................................12 2.3.3 Noise Evaluation Criterion....................................................................................................13 2.3.4 Fuel Consumption Evaluation Criterion ...............................................................................13 2.3.5 Emission Index Evaluation Criterion ....................................................................................14 2.3.6 IQ Index Evaluation Criterion...............................................................................................15 2.3.7 Life Cycle Cost Evaluation Criterion....................................................................................15 3 PRELIMINARY SIZING AND PERFORMANCE .......................................................................15 3.1 VEHICLE SIZING METHOD ............................................................................................................15 3.2 CIRADS: CONCEPT -INDEPENDENT ROTORCRAFT ANALYSIS AND DESIGN SOFTWARE ..............16 3.2.1 Validation of CIRADS’ Predictions......................................................................................17 3.2.2 Athena Vehicle Sizing Mission.............................................................................................18 3.2.3 Configuration Selection: Initial RF Analysis ........................................................................18 3.2.4 Selection of Major Design Parameters: RF Sensitivity Analysis..........................................19 3.3 ROTOR MORPHING TRADE STUDY ...............................................................................................19 3.3.1 Dual Speed Optimization ......................................................................................................20 4 MAIN ROTOR BLADE AND HUB DESIGN ................................................................................21
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