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Abstract
FADS provides air data parameters of an aerospace vehicle such as angle of attack, angle of sideslip, Mach number, etc for use by the flight control and guidance system. It essentially makes use of surface pressure measurements, from mostly the nose cap of the vehicle for deriving these air data parameters. Flush Air Data System (FADS) was indigenously developed and flown successfully in the RLV-TD HEX-01 mission. Before carrying out flight testing of FADS, testing with a full scale model was carried out initially at national wind tunnel facility, Indian Institute of Technology, Kanpur. This paper highlights some of the problems encountered during the integration and testing of FADS at IIT, Kanpur. The corrective steps taken for overcoming these problems encountered is discussed. With the corrections implemented the full scale wind tunnel test was repeated and it was observed that the design objectives of FADS are met by the system.
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References
- Whitmore, S. A., Cobleigh, B. R. and Haering,. E. A., "Design and Calibration of the X-33 Flush Air Data Sensing (FADS) System", NASA/TM-1998- 206540, Research Engineering, NASA Dryden Flight Research Centre, January 1998, pp.1-32.
- Ellsworth, J. C. and Whitmore, S. A., "Re-entry Air Data System for a Suborbital Spacecraft Based on X-34 Design", AIAA Paper 2007-1200.
- Ellsworth, J. C. and Whitmore, S. A., "Simulation of a Flush Air Data System for Transatmospheric Vehicles", Journal of Spacecraft and Rockets, Vol. 45, No. 4, July-August, 2008.
- Larson, T. J. and Siemers, P. M., "Use of Nose Cap and Fuselage Pressure Orifices for Determination of Air Data for Space Shuttle Orbiter Below Supersonic Speeds", NASA TP-1643, 1980.
- Larson, T. J., Whitmore, S. A., Ehernberger, L. J., Johnson, J. B. and Siemers, P. M., "Qualitative Evaluation of a Flush Air Data System at Transonic Speeds and High Angles of Attack", NASA TP-2716, 1987.
- Rajeshkumar, G.V. et al., "Calibration of Air Data Systems Using Numerical Simulation of Supersonic Flow Over Blunt Forebody", 20th National Convention of Aerospace Engineers, October 29-30, 2006, Trivandrum, India.
- Siemers, P. M., Paul, M., Henry, W. and Martin, W. H., "Shuttle Entry Air Data System (SEADS) Flight Verification of an Advanced Air Data System Concept", AIAA 88-2104, 1988.
- Whitmore, S. A., Moes, T. R. and Larson, T. J., "Preliminary Results From a Subsonic High of Attack Flush Air Data Sensing (HI-FADS) System Design, Calibration and Flight Test Evaluation", NASA TM-101713, 1990.
- Whitmore, S. A., Davis, A. R. and Fife, M. J., "Flight Demonstration of a Real Time Flush Air Data Sensing (RT-FADS) System", AIAA Paper 94-3433, August 1995.
- Rajesh Kumar, G. V., Harish, C. S., Swaminathan, S. and Madan Lal., "Development of a Flush Air Data System for a Winged Body Re-entry Vehicle", 2nd European Conference for Aerospace Sciences (EUCASS), Belgium, France, 2007.
- Remesh, N., Jayakumar, M., Finitha, K.C., Abhay Kumar., Shyam Mohan, N. and Swaminathan, S., "Pressure Measurement Sensitivity Studies on a Reusable Launch Vehicle (RLV) Flush Air Data Sensing System (FADS)", Proceedings of National Conference on Space Transportation Systems, Opportunites and Challenges (STS), 2011.
References
Whitmore, S. A., Cobleigh, B. R. and Haering,. E. A., "Design and Calibration of the X-33 Flush Air Data Sensing (FADS) System", NASA/TM-1998- 206540, Research Engineering, NASA Dryden Flight Research Centre, January 1998, pp.1-32.
Ellsworth, J. C. and Whitmore, S. A., "Re-entry Air Data System for a Suborbital Spacecraft Based on X-34 Design", AIAA Paper 2007-1200.
Ellsworth, J. C. and Whitmore, S. A., "Simulation of a Flush Air Data System for Transatmospheric Vehicles", Journal of Spacecraft and Rockets, Vol. 45, No. 4, July-August, 2008.
Larson, T. J. and Siemers, P. M., "Use of Nose Cap and Fuselage Pressure Orifices for Determination of Air Data for Space Shuttle Orbiter Below Supersonic Speeds", NASA TP-1643, 1980.
Larson, T. J., Whitmore, S. A., Ehernberger, L. J., Johnson, J. B. and Siemers, P. M., "Qualitative Evaluation of a Flush Air Data System at Transonic Speeds and High Angles of Attack", NASA TP-2716, 1987.
Rajeshkumar, G.V. et al., "Calibration of Air Data Systems Using Numerical Simulation of Supersonic Flow Over Blunt Forebody", 20th National Convention of Aerospace Engineers, October 29-30, 2006, Trivandrum, India.
Siemers, P. M., Paul, M., Henry, W. and Martin, W. H., "Shuttle Entry Air Data System (SEADS) Flight Verification of an Advanced Air Data System Concept", AIAA 88-2104, 1988.
Whitmore, S. A., Moes, T. R. and Larson, T. J., "Preliminary Results From a Subsonic High of Attack Flush Air Data Sensing (HI-FADS) System Design, Calibration and Flight Test Evaluation", NASA TM-101713, 1990.
Whitmore, S. A., Davis, A. R. and Fife, M. J., "Flight Demonstration of a Real Time Flush Air Data Sensing (RT-FADS) System", AIAA Paper 94-3433, August 1995.
Rajesh Kumar, G. V., Harish, C. S., Swaminathan, S. and Madan Lal., "Development of a Flush Air Data System for a Winged Body Re-entry Vehicle", 2nd European Conference for Aerospace Sciences (EUCASS), Belgium, France, 2007.
Remesh, N., Jayakumar, M., Finitha, K.C., Abhay Kumar., Shyam Mohan, N. and Swaminathan, S., "Pressure Measurement Sensitivity Studies on a Reusable Launch Vehicle (RLV) Flush Air Data Sensing System (FADS)", Proceedings of National Conference on Space Transportation Systems, Opportunites and Challenges (STS), 2011.