Add MultiRotor class

[jguarato]

This pull request introduces the MultiRotor class, initially designed to enable the coupling of multiple rotors using gears. To support this functionality, the GearElement class is also being implemented.

It is important to note that the use of these new classes requires the rotor model to support 6 degrees of freedom.

I will provide updates here as the development progresses.

[ross-bott]

Hi there!
I have marked this issue as stale because it has not had activity for 45 days.
Consider the following options:

• If the issue refers to a large task, break it in smaller issues that can be solved in
  less than 45 days;
• Label the issue as wontfix or wontfix for now and close it.

[plevisse-naarea]

Hey,
I'm particularly interested in this functionality! Thanks for tackling it. Do you have visibility on when it could be pulled into the main code ? Are there specific issues where I could potentially give a hand ?

[jguarato]

Hey, I'm particularly interested in this functionality! Thanks for tackling it. Do you have visibility on when it could be pulled into the main code ? Are there specific issues where I could potentially give a hand ?

Hey, @plevisse-naarea!

The main features of this module have already been implemented. I am currently trying to validate the results obtained from ROSS, following this paper [A general method to predict unbalance responses of geared rotor systems] as reference.

For the first case presented in the reference, I achieved results that closely align:

However, for the second case, I am noticing some discrepancies and have not yet been able to identify the cause of these differences:

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.11470% with 22 lines in your changes missing coverage. Please review.

Project coverage is 82.38%. Comparing base (b8a7f44) to head (6996519).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ross/multi_rotor.py	88.05%	16 Missing ⚠️
ross/disk_element.py	33.33%	2 Missing ⚠️
ross/rotor_assembly.py	97.18%	2 Missing ⚠️
ross/gear_element.py	97.36%	1 Missing ⚠️
ross/point_mass.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   82.15%   82.38%   +0.23%     
==========================================
  Files          38       40       +2     
  Lines        8259     8477     +218     
==========================================
+ Hits         6785     6984     +199     
- Misses       1474     1493      +19     

Files with missing lines	Coverage Δ
ross/__init__.py	100.00% <100.00%> (ø)
ross/bearing_seal_element.py	92.90% <100.00%> (ø)
ross/element.py	88.88% <100.00%> (+1.85%)	⬆️
ross/shaft_element.py	96.56% <100.00%> (+<0.01%)	⬆️
ross/gear_element.py	97.36% <97.36%> (ø)
ross/point_mass.py	91.50% <50.00%> (ø)
ross/disk_element.py	98.48% <33.33%> (-1.52%)	⬇️
ross/rotor_assembly.py	94.15% <97.18%> (+0.06%)	⬆️
ross/multi_rotor.py	88.05% <88.05%> (ø)

... and 1 file with indirect coverage changes

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