An Attitude Control Strategy Using Four Cold Gas Thrusters for the SCRAMSPACE 1 Experiment

Creagh, Michael; Staden, Paul A. van; Tirtey, Sandy

doi:10.2514/6.2012-5844

Cited by 2 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The vehicle of interest in this paper is the SCRAMSPACE 1 hypersonic flight experiment [1], with configuration shown in Fig. 1.…”

Section: Vehicle and Mission Profilementioning

confidence: 99%

“…The RCS is activated on the descent trajectory at an altitude of 160km. The 10 different RCS modes that are part of the current Scramspace project are outlined in [1]. However, in this paper the feasibility of mode 8 is initially explored as the only means of controlling the orientation of the vehicle.…”

Section: Fig 2 Scramspace Trajectory Mission Profilementioning

confidence: 99%

“…At approximately 75km altitude, a yoyo de-spin system activates (4), which reduces the spin-rate of the vehicle from 3 Hz to approximately ±0.1 Hz. After the release of the yoyo masses and cables, SCRAMSPACE separates from the IO (5) with pneumatic pistons [1].…”

Section: Fig 1 Scramspace Flight Experimentsmentioning

confidence: 99%

“…The mechanical arrangement for the thrusters and the pneumatic system on SCRAMSPACE 1 is outlined in [1].…”

Section: Fig 4 Thruster Command and Thrust Profile [1]mentioning

confidence: 99%

“…The pitch and yaw rate loops follow a similar structure to that of the roll rate damping loop. The entire controls strategy implemented for the SCRAMSPACE vehicle is placed in [1].…”

Section: Control System Strategymentioning

confidence: 99%

See 4 more Smart Citations

An Alternative Attitude Control Strategy for SCRAMSPACE 1 Experiment

Banerjee

Creagh

Boyce

2014

AIAA Guidance, Navigation, and Control Conference

View full text Add to dashboard Cite

The current reaction control strategy for SCRAMSPACE 1 involves an exo-atmospheric reorientation using attitude and rate feedback from the Inertial Navigation System. An alternative design methodology of an attitude control system is presented that only uses rate feedback. This eliminates the need for an attitude determination system altogether. This methodology is designed to re-orient the hypersonic experimental vehicle SCRAMSPACE 1 by using rate damping and natural aerodynamic moments. It is desired that the re-orientation produces a 2.5 degrees angle of attack at 32km altitude on the decent trajectory. This angle of attack is necessary in order to test the scramjet at Mach 8. The re-entry rate damping is initialized at an altitude of 55km on the descent trajectory. The worst case scenario angle of attack of 150 degrees is taken as the initial conditions at 200km altitude. For the worst case scenario, thrusters of size 10N, 15N, 20N, 25N and 30N are able to acquire the desired angle of attack. The final angles of attack for all the aforementioned thruster sizes are less than 1 deg. The mean of the angle of attack during the experimental window is under 0.5 degrees for all tested cases of thruster force, initial spin rate and initial angle of attack. However, when a sensible fuel restriction of 5kg is placed, the recommended thruster size is 20N. Nomenclature = body coordinates 1 , 2 , 3 = body coordinate axes , , = roll, pitch and yaw principle moments of inertial, kgm 2 = component xy of moment of inertia matrix, kgm 2 = specific impulse, sec , = autopilot feedback gains for roll angle and roll rate , , = roll, pitch, yaw moment requests about body coordinate axes, Nm , , = roll, pitch, yaw rate, rad/s 1, 2, 3, 4 = thruster force, N. = nominal thruster force, N = angle of attack, deg = initial angle of attack, deg !, ", # = roll, pitch, yaw angles, rad 1$ = 1 standard deviation (Gaussian distribution)

show abstract

“…The vehicle of interest in this paper is the SCRAMSPACE 1 hypersonic flight experiment [1], with configuration shown in Fig. 1.…”

Section: Vehicle and Mission Profilementioning

confidence: 99%

Section: Fig 2 Scramspace Trajectory Mission Profilementioning

confidence: 99%

Section: Fig 1 Scramspace Flight Experimentsmentioning

confidence: 99%

“…The mechanical arrangement for the thrusters and the pneumatic system on SCRAMSPACE 1 is outlined in [1].…”

Section: Fig 4 Thruster Command and Thrust Profile [1]mentioning

confidence: 99%

“…The pitch and yaw rate loops follow a similar structure to that of the roll rate damping loop. The entire controls strategy implemented for the SCRAMSPACE vehicle is placed in [1].…”

Section: Control System Strategymentioning

confidence: 99%

See 3 more Smart Citations