Space Propulsion - IAP/TU Wien

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Space Propulsion precession of spin axis H i … initial angular momentum H a … applied angular momentum Φ / 2 ≈ H a = H i nFLtb I yω nutation angle caused by application of single thrust pulse Two pulses are required to precess the spin axis; both pulses are parallel to the spin axis. After the First pulse, the spin axis will continue to precess until a second pulse of equal magnitude and opposite direction is fired. The spin axis can be repositioned by selecting the timing of the second pulse. The first pulse is used to cause nutation at an angle of one-half the desired precession. The second pulse stops the nutation and provides the remaining half of the desired angle
Space Propulsion Example 7: Precession of Spin Axis What burn time, or pulse width, is required to precess a spacecraft spin axis by 3-deg (0.05236 rad) under the following conditions: Thrust 10 N Moment arm = 0.5 m Moment of inertia 112.5 kg.m2 Spacecraft Spin rate 2 rpm (0.2094 rad/s) Specific impulse = 1900 m/s t ΦIvω = 2nFL 0.05236*112.5*0.2094 2*1*10*0.5 b = = 0.124 [ s] burn time of thruster to produce nutation angle Φ/2 m nFtb 2*1*10*0.124 = 2 = = 0.0013 [ kg] 1.3 [ g] total propellant consumed by both burns I 1900 p = sp
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Space Propulsion - IAP/TU Wien

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