Rocket Roll Dynamics and Disturbance – Minimal modelling and system identification (2010)

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University of Canterbury. Electrical and Computer EngineeringUniversity of Canterbury. Mechanical Engineering
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The roll dynamics of a 5kg, 1.3 m high sounding rocket are analyzed in a vertical wind tunnel. Significant turbulence in the tunnel makes the system identification of the effective inertia, damping and asymmetry with respect to roll challenging. A novel method is developed which decouples the disturbance from the rocket frame’s intrinsic roll dynamics and allows accurate prediction of roll rate and angle. The parameter identification method is integral-based, and treats wind disturbances as equivalent to a movement in the actuator fins. The method is robust, requires minimal computation, and gave a realistic disturbance distribution reflecting the randomness of the turbulent wind flow. The mean absolute roll rate of the rocket frame observed in experiments was 16.4 degree/s and the model predicted the roll rate with a median error of 0.51 degrees/s with a 90th percentile of 1.25 degrees/s. The roll angle (measured by an encoder), was tracked by the model with a median absolute error of 0.25 degrees and a 90th percentile of 0.50 degrees. These results prove the concept of this minimal modeling approach which will be extended to pitch and yaw dynamics in the future.
Citation
Hann, C.E., Snowdon, M., Rao, A., Tang, R., Korevaar, A., Skinner, G., Keall, A., Chen, X.Q., Chase, J.G. (2010) Rocket Roll Dynamics and Disturbance – Minimal modelling and system identification. Singapore: 11th International Conference on Control, Automation, Robotics and Vision (ICARCV 2010), 7-10 Dec 2010. 6 pages.This citation is automatically generated and may be unreliable. Use as a guide only.
ANZSRC Fields of Research
40 - Engineering::4001 - Aerospace engineering::400107 - Satellite, space vehicle and missile design and testing09 - Engineering::0906 - Electrical and Electronic Engineering
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