incorporating reaction wheels in "Attitude Dynamics" box.

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Gökhan
Gökhan 2024-10-23，13:37
评论： Gökhan 2024-11-6，8:33
Hi All;
Currently there is a useful, all-in-one box in simulink called "Attitude Dynamics" which is a compact form of simulating the attitude dynamics equations of a satellite. The dynamic equations used in the box is also summarized here. However it does not account for any reaction / momentum wheel dynamics. The wheel torque may be inserted through "Mb" input of the box however in the dynamic equations there should also be a term for "w_b_icrf x wheel_momentum". The question is as follows:
  1. Is there a way through the user interface of this box to incorporate wheel momentum and torque?
  2. if not is there another attitude dynamics box which takes wheel dynamics as input?
  3. if not, can you -in the future releases- include an external wheel momentum / and torque input to this box ?
Thanks
Gökhan
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Brahmadev
Brahmadev 2024-11-6，5:03
Hi @Gökhan,
Thank you for sharing more information regarding the equation. Could you also point to any written resources such as papaers or books that mention said equation?
Gökhan
Gökhan 2024-11-6，8:33
Hi @Brahmadev; For example, the book "Spacecraft Dynamics and Control" (https://www.sciencedirect.com/book/9780081007006/spacecraft-dynamics-and-control#book-info) (Canuto, Masotti, Novara, Carlucci, Montenegro) ISBN 978-0-08-100700-6; Section 7.7 (under Chapter 7: Attitude Dynamics: Modeling and control) talks about dynamic equations regarding " Attitude Dynamics with Internal Rotating Masses" in detail.
Thanks
Gökhan

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Brahmadev
Brahmadev 2024-11-5，8:55
Hi @Gökhan,
Based on the documentation mentioned by you, the "Attitude Dynamics" does not provide a direct method to incorporate wheel momentum into the dynamics equations.
Unfortunately, there are no other blocks which take into consideration the "Wheel dynamics". The "Spacecraft Dynamics" block also uses the same equations for Rotational Dynamics. Refer to the documentation page below:
https://www.mathworks.com/help/aeroblks/getting-started-with-the-spacecraft-dynamics-block.html
Hence, you might need to create a custom subsystem in Simulink that models the dynamics according to your requirement. Alternatively, you can reach out to MathWorks Technical Support and share your use-case. You can create a technical support query at:
https://www.mathworks.com/support/contact_us.html
Hope this helps!

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