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Development and Testing of a Paragliding Device for Disabled Pilots

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Development and Testing of a Paragliding Device for Disabled Pilots DEVELOPMENT AND TESTING OF A PARAGLIDING DEVICE FOR DISABLED PILOTS by Faris Ali A thesis submitted to the faculty of The University of Utah in partial fulfillment of the requirements for the degree of Master of Science Department of Mechanical Engineering The University of Utah August 2015 Copyright © Faris Ali 2015 All Rights Reserved The University of Utah Graduate School STATEMENT OF THESIS APPROVAL The thesis of _________________________ Faris Ali________________________ has been approved by the following supervisory committee members: _______________ Donald Bloswick________________ , Chair _____06/09/15 Date Approved ____________ Andrew Merryweather_____________ , Member _____05/14/15 Date Approved __________________Bruce Gale___________________ , Member 05/14/15 Date Approved and by ______________________Tim Ameel______________________ , Chair/Dean of the Department/College/School o f ____________ Mechanical Engineering___________ and by David B. Kieda, Dean of The Graduate School. ABSTRACT People with lower limb physical disabilities have been traditionally limited in their options for recreational sports and outdoor activities, including paragliding. The Phoenix paragliding system has been created to help these individuals paraglide safely. In order to address the limitations of this populace, Able Pilot, a local nonprofit organization approached the department of mechanical engineering at the University of Utah to build a mobility device, called Phoenix. The university accepted this partnership due to Able Pilot's established research instructional program. Able Pilot's program is designed to establish and support the development and testing of formal paragliding and their Ultralight instructional protocols and methods for pilots with various disabilities. The purpose of this study is to evaluate a proposed improvement of the existing Phoenix 1.5 paragliding system. The Phoenix 2.0 is similar to previous versions; however, changes in design have been introduced to better meet customer requirements received after test flights with the earlier versions. The new version is proposed to be constructed from lightweight materials without losing strength. The frame is made of aluminum alloy 6061-T6 tubing with an outer diameter of 1 in. and wall thickness of 0.095 in. The Phoenix 2.0 is constructed from an aluminum alloy opposed to the Phoenix 1.5’ s Chromalloy steel alloy frame. This results in a lighter device. Substituting an aluminum alloy led designers to request engineering analyses, especially finite element analysis, to verify that this version’s structure is strong enough to protect the pilot during various landing scenarios. In order to improve pilot safety, analysis and design changes have been made to the headrest, which also acts as roll protection during adverse landings. Final recommendations include continuing work on the headrest to increase its utility as both a handle and a safety feature, upgrading the wheels to heavyduty mountain bike wheels, and regularly inspecting and replacing these wheels. These recommendations, supported by the work presented in this thesis, will ensure that the Phoenix 2.0 will safely allow people with lower limb disabilities to fly the blue skies. CONTENTS A B STR A C T........................................................................................................................... iii LIST OF FIGURES ............................................................................................................ vi LIST OF TABLES................................................................................................................ ix ACKNOWLEDGMENTS................................................................................................ x CHAPTERS 1.....IN TR O D U C TIO N ....................................................................................................... 1 1.1 Paragliding................................................................................................................ 1 1.2 Paragliding history................................................................................................... 1 1.3 Safety ......................................................................................................................... 2 1.4 Paragliding for disabled pilots................................................................................. 2 1.5 Phoenix....................................................................................................................... 4 1.5.1 Phoenix 1.0....................................................................................................... 4 1.5.2 Phoenix 1.5 ....................................................................................................... 5 1.5.3 Phoenix 2.0....................................................................................................... 7 2. SYSTEM DESIGN ..................................................................................................... 8 2.1 Frame ......................................................................................................................... 8 2.2 Footrest....................................................................................................................... 11 2.2.1 First iteration................................................................................................... 11 2.2.2 Second iteration .............................................................................................. 11 2.2.3 Third iteration ................................................................................................ 14 2.3 Headrest ..................................................................................................................... 16 2.3.1 First iteration................................................................................................... 16 2.3.2 Second iteration .............................................................................................. 16 2.4 Frame weight .............................................................................................................. 18 2.5 Design change summary .......................................................................................... 18 3. SYSTEM EVALUATION.......................................................................................... 23 3.1 System engineering tool .......................................................................................... 23 3.1.1 Requirements ................................................................................................... 23 3.1.2 Essential activities............................................................................................ 24 3.1.3 Technical requirements dictionary ............................................................... 24 3.1.4 Functional decomposition diagram ............................................................... 24 3.1.5 Trade study ....................................................................................................... 27 3.2 Failure mode effect analysis ................................................................................... 27 3.2.1 Risk priority number........................................................................................ 28 3.2.2 Weighted score................................................................................................. 28 3.3 Finite element analysis............................................................................................ 34 3.4 Push rod member stress calculation Phoenix 2.0 ............................................... 36 3.5 Calculation of the quick release............................................................................... 36 4. RESULTS AND DISCUSSION............................................................................... 38 4.1 Roll envelope for Phoenix 2.0 ................................................................................. 38 4.2 FEA results ................................................................................................................ 40 4.2.1 Frame ................................................................................................................ 40 4.2.2 Headrest ............................................................................................................ 50 5. RECOM M ENDATIONS............................................................................................ 62 5.1 Frame ......................................................................................................................... 62 5.2 Headrest ..................................................................................................................... 62 6. CONCLUSION.............................................................................................................. 66 REFERENCES ..................................................................................................................... 68 v LIST OF FIGURES 1.1 Disabled passenger with his pilot behind ................................................................... 3 1.2 Phoenix 1.0....................................................................................................................... 4 1.3 Phoenix 1.0 frame............................................................................................................ 5 1.4 Phoenix 1.5......................................................................................................................
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