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The flutter analysis of the JS1 glider

The flutter analysis of the JS1 glider. Pieter S. Rossouw Master’s Degree Student Supervisor: Mr. Attie S. Jonker North-West University (Potchefstroom). Introduction. New composite glider: JS1 Revelation 18 meter wingspan Maximum speed: 290 km/h (V ne ) Designed by Attie Jonker

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The flutter analysis of the JS1 glider

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  1. The flutter analysis of the JS1 glider Pieter S. Rossouw Master’s Degree Student Supervisor: Mr. Attie S. Jonker North-West University (Potchefstroom)

  2. Introduction • New composite glider: JS1 Revelation • 18 meter wingspan • Maximum speed: 290 km/h (Vne) • Designed by Attie Jonker & team • Certify new aircraft • Design diving speed (VD) • 1.2VD = 388.8 km/h = 209.9 knots © CSIR 2006 www.csir.co.za

  3. Problem definition/statement • What is flutter? • Flutter analysis main steps • Modal analysis • Flutter prediction • Flutter flight test • Modal analysis done by • Finite element software • Ground vibration test • JS1 flutter analysis steps: • Modal analysis • Flutter prediction © CSIR 2006 www.csir.co.za

  4. Modal analysis • Ground vibration test @ CSIR • Two glider configurations • Simulate free condition • Excitation with electrodynamic shaker • Response measurement with sensors • Dynamic characteristics are • Natural frequency • Mode shape • Modal damping • What is a mode? • Wing, fin and tailplane modes found © CSIR 2006 www.csir.co.za

  5. Modal analysis (continued) © CSIR 2006 www.csir.co.za

  6. Modal analysis (continued) • 2nd symmetric wing bending @ 7.34 Hz © CSIR 2006 www.csir.co.za

  7. Flutter prediction • Use modal data in flutter code • Flutter code utilizes • Doublet lattice method • p-k method • Flutter results • Damping vs. airspeed • Frequency vs. airspeed • Altitudes up to 8000 meters • One indication of flutter: 430 knots • Results above 210 knots – no concern © CSIR 2006 www.csir.co.za

  8. Flutter prediction (continued) 210 knots (1.2VD) © CSIR 2006 www.csir.co.za

  9. Conclusion • Modal analysis done by • Ground vibration test • Flutter analysis done for • Speeds up to 388.8 km/h (210 knots) • Altitudes up to 8000 meters • For all modes found • Stability for JS1 design envelope © CSIR 2006 www.csir.co.za

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