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Critical Design Review

Critical Design Review. Debbie Klein Dynamics and Control Tether Dynamics 2/27/01. Accomplished tasks. MATLAB code numerically integrates Euler’s equations using technique learned in AAE 507 (Principles of Dynamics) Thrusters are ‘turned on’ when s/c is within 30° of thrusting point(s)

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Critical Design Review

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  1. Critical Design Review Debbie Klein Dynamics and Control Tether Dynamics 2/27/01

  2. Accomplished tasks • MATLAB code numerically integrates Euler’s equations using technique learned in AAE 507 (Principles of Dynamics) • Thrusters are ‘turned on’ when s/c is within 30° of thrusting point(s) • Code integrates in all three directions, but examples presented today deal only with in-plane thrusting • Two versions of code deal with single-point thrusting and coupled-thrusting

  3. thrusting point 30 30 Rotates counter-clockwise x v z y 30 30 thrusting point Last week’s questions Nick Czapla: How are inertial properties of s/c modeled? s/c is modeled as two cylinders and a thin-rod Alec Spencer: Why is a v created in the y-direction with coupled thrusting? visual explanation required

  4. Function inputs Single-point thrusting: [vm1,wz,thetaz,t,T,dvx,dvy] = aae450tether2(thetaz0,thetazdot0,Mzi,tf) Double-point (coupled) thrusting: [vm1,wz,thetaz,t,T,dvx,dvy] = aae450tether3(thetaz0,thetazdot0,Mzi,tf) where… thetaz0 = initial s/c position wrt -x axis thetazdot0 = initial z value Mzi = torque about c.m. caused by thruster tf = length of simulation

  5. Specific Cases thetaz0 = 0 rad thetazdot0 = .14 rad/s Mzi = 5.6 x 106 Nm tf = 165 s Double-point thrusting: Single-point thrusting: vx = 18.6346 m/s vy = .2464 m/s zf = .1558 rad/s vx = 38.7952 m/s vy = 0 m/s

  6. Single thrusting point case:z vs. Time z (rad/sec) time (sec)

  7. Single thrusting point case:vx vs. Time vx (m/sec) vx (m/sec) time (sec) time (sec)

  8. Double (coupled) thrusting point case:z vs. Time z (rad/sec) time (sec)

  9. Double (coupled) thrusting point case:vx vs. Time vx (m/sec) time (sec) vx (m/sec) time (sec)

  10. Conclusions/Future work • Code complete and tested • Now can be used for out-of-plane burns • Function call to allow thrusting scheme for a given v will be added to code • Questions???

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