Documentation for ExtPtfm

[ebranlard]

This pull request is ready to be merged

Feature or improvement description
Documentation added. A live version is available here:
https://ebranlard-openfast.readthedocs.io/en/f-extptfm-doc/source/user/extptfm/index.html

Related pull request
#344

Related issues
#852
#549
#485

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 11.28%. Comparing base (7a59bec) to head (af93cc4).
⚠️ Report is 4753 commits behind head on dev.
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@@            Coverage Diff             @@
##              dev     #858      +/-   ##
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+ Coverage   11.27%   11.28%   +0.01%     
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  Files         211      211              
  Lines      309733   310488     +755     
  Branches   180530   181011     +481     
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+ Hits        34910    35054     +144     
- Misses     230900   231363     +463     
- Partials    43923    44071     +148     

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unittests	2.57% <ø> (ø)

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[jjonkman]

@ebranlard -- Thank you for developing this documentation. Overall, an excellent documentation of the ExtPtfm module! Please find a few minor edits/corrections here. After these are addressed, please merge.

[jjonkman]

Thanks for addressing my edits/comments!

[Qiaoyanhui]

Dear jjonkman,
I am confused about how to obtain the mass, stiffness, damping, and excitation force matrices in the ExtPtfm module, especially how to consider coupled motions such as surge-pitch, pitch-yaw, and surge-yaw, and how to obtain non-diagonal elements in the mass, stiffness, damping, and excitation force matrices corresponding to coupled motions?
Best regards.

[jjonkman]

Dear @Qiaoyanhui,

It looks like you asked the same question in the following GitHub issue: #2275. I've now responded there and let's keep the conversation there.

Best regards,