On Stability and Control of SSTO Spaceplane in Super-and Hypersonic Ascending Phase
1991
The natural dynamic stability of a single stage to orbit (SSTO) National Aerospace Laboratory Spaceplane Configuration is evaluated at seven reference points on a super-to hypersonic and constant dynamic pressure ascent trajectory. It is shown that dynamic instability occurs in the longitudinal and lateral motion during wide parts of the regarded trajectory. To counteract these instabilities a simple output feedback control is introduced to achieve a pole assignment of the dominant modes according to handling quality criteria commontly use for conventional aircraft. The sensitivity of augmented stability parameters to deviations in the feedback gain constants is evaluated. The dynamic behaviour of stability augmented Spaceplane is investigated by numerical simulation of its longitudinal motion during an ascent in standard clear air turbulence. Results indicate the sufficient performance of the control design. The controlled elevator deflection angles remain small despite the severe natural instability which occurred during wide parts of ascent trajectory.
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