I have a few questions about computing torques and forces.

I use the same configuration as in the thesis titled An Attitude Control Sysytem Design Based on the Turksat-1b Geostationary Satellite.

The thruster orientation and the location of the model are mentioned in Table 3-4-5, pages 53-55, and I use the equations 4.19a, 4.19b, 4.19c, but I don't get the same value as it mentions in Tables 4-5.

I used the equation (4.19b) to calculate the force Fx, but I didn’t get the same results.

Is this the right way enter image description hereto compute the force???


enter image description here

  • 2
    $\begingroup$ If you have a link to that paper, it would be nice to add it to the question. That said, table 5 is in not consistent with tables 3 and 4. Table 5 is merely table 4 with an extra place of precision rather than $\vec r \times \vec F$. $\endgroup$ – David Hammen Jun 14 '18 at 11:26
  • $\begingroup$ google.com.hk/url?sa=t&source=web&rct=j&url=http://… $\endgroup$ – khouane boulanouar Jun 15 '18 at 23:08
  • $\begingroup$ google.com.hk/url?sa=t&source=web&rct=j&url=http://… $\endgroup$ – khouane boulanouar Jun 15 '18 at 23:08
  • $\begingroup$ Page 53 54 55 please check the table $\endgroup$ – khouane boulanouar Jun 15 '18 at 23:09
  • $\begingroup$ The tables are inconsistent. That happens, even in the best of publications. That's why even the best of publications publish corrections, also known as "errata". The torque from a thruster (table 5) must be the vector cross product of the displacement vector from the center of mass (table 3) and force (table 4). That's a must be, but in this case, that isn't the case. Scientific papers appear to violate the laws of physics with great regularity due to bad writing, bad editing, or bad peer review. $\endgroup$ – David Hammen Jun 16 '18 at 9:14

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