Abstract
In this paper, simpler methods of measuring various performance parameters, such as pivot point excursions, actuation angles, and symmetry of the nozzle motion of a flex nozzle system (FNS) meant for a large solid rocket booster nozzle are reported. A novel attempt is made to estimate the above parameters using the pivot point co-ordinates as primary data. Towards this objective, the trajectories of a reference point obtained using one stereo based 3-dimensional Digital Image Correlation (3-D DIC) system, above a nozzle simulator during the vectoring tests, were utilized. A linear least squares (LLS) method is proposed and validated for locating the pivot point from the 3-D DIC trajectory. The pivot point location and the measured DIC displacements were further analyzed to evaluate the target parameters. The results show that use of the 3-D DIC system provides confidence on the performance of the actuators with a simplified measurement scheme. Moreover, it generates useful additional data, as spin-offs, comparable with the conventional measurements. Thereby data reduction, testing time and resource required for characterization of a FNS is expected to reduce considerably.
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Notes
The nozzle simulator is a dummy nozzle called as cross beam assembly. Henceforth, the names nozzle simulator, cross beam assembly and dummy nozzle will be used interchangeably in the text.
A larger area however cannot be chosen for averaging because of the tilting of the cross beam during actuation.
The line joining the pivot point to the reference point is the pivot radius; see Fig. 7 from the cut side.
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Acknowledgements
The authors have great pleasure in acknowledging the support rendered by Mr. S Karthigai Selvan, Sr. Tech. Asst. and Mr S N Suresh, Sr. Technician, both from ETS/EXMD, VSSC for their support during test and data generation. The authors specially acknowledge Mr. V. Eswaran, Deputy Director, Solid Propulsion and Research (SPR) Entity (also Project Director, S200 Project), VSSC for his encouragement, internal review of the manuscript and valuable suggestions. The LVDT and other instrumentation support provided by Mr Dhrishit M P, PRG/SPR Entity, VSSC and his team during the vectoring test of S200 flex seals is also acknowledged.
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Swain, D., Biswal, S., Thomas, B. et al. Performance Characterization of a Flexible Nozzle System (FNS) of a Large Solid Rocket Booster Using 3-D DIC. Exp Tech 43, 429–443 (2019). https://doi.org/10.1007/s40799-018-0282-x
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DOI: https://doi.org/10.1007/s40799-018-0282-x