Issue running b737 tutorial

[Taras Yushchenko]

Hello!

Trying to run suave, i was able to fix the issue with all the imports by updating the function calls, but now I run into this error when running the basic 737 case. Any suggestions?

(suave_env) PS C:\Users\tyush\OneDrive\Desktop\SUAVE1> python Tutorials-2.5.2\tut_mission_B737.py
Traceback (most recent call last):
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\Tutorials-2.5.2\tut_mission_B737.py", line 967, in <module>
    main()
    ^^^^^^
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\Tutorials-2.5.2\tut_mission_B737.py", line 57, in main
    analyses.finalize()
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Analysis.py", line 271, in finalize
    analysis.finalize(*args,**kwarg)
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Analysis.py", line 271, in finalize
    analysis.finalize(*args,**kwarg)
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Analysis.py", line 271, in finalize
    analysis.finalize(*args,**kwarg)
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Aerodynamics\Fidelity_Zero.py", line 145, in initialize
    self.process.compute.lift.inviscid_wings.initialize(use_surrogate,n_sw,n_cw,propeller_wake_model,mf,mn,dcs )
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Aerodynamics\Vortex_Lattice.py", line 167, in initialize
    self.sample_training()
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Aerodynamics\Vortex_Lattice.py", line 430, in sample_training
    total_lift, total_drag, wing_lifts, wing_drags, _, _, _, _, _, _, _ = calculate_VLM(konditions,settings,geometry)

                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Aerodynamics\Vortex_Lattice.py", line 663, in calculate_VLM
    results = VLM(conditions,settings,geometry)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Methods\Aerodynamics\Common\Fidelity_Zero\Lift\VLM.py", line 267, in VLM
    GAMMA  = np.linalg.solve(A,RHS)
             ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\numpy\linalg\_linalg.py", line 396, in solve
    _assert_stacked_square(a)
  File "C:\Users\tyush\OneDrive\Desktop\SUAVE1\suave_env\Lib\site-packages\numpy\linalg\_linalg.py", line 202, in _assert_stacked_square
    raise LinAlgError('Last 2 dimensions of the array must be square')
numpy.linalg.LinAlgError: Last 2 dimensions of the array must be square

[Kilian Zimmer]

The tutorial seems to be outdated.

[Grant Hiller]

I get the same error when I run any of the tutorials. I think it might be an issue with what version of numpy is being used...? Am looking into it, but if anyone has any ideas, let us know!

[Haoliang Yu]

Because SUAVE hasn't been updated for a while, I suggest using an earlier version of Python, specifically Python 3.9. Here are some package versions that you might find useful:

• numpy==1.22.3
• scipy==1.8.0
• matplotlib==3.5.1
• scikit-learn==1.0.2
• plotly==5.6.0

These should be sufficient to help you solve the problem. Although I have produced a complete video tutorial, it's presented in Chinese, which might not be very helpful to you.

Knight

[Grant Hiller]

Thanks for the advice Knight, that seemed to do the trick. I am now able to get (some) of the tutorials running.

The evtol tutorial gives me a different error, but I'll look into that separately.

  File "C:\Users\grant\.conda\envs\py39\lib\site-packages\suave-2.5.2-py3.9.egg\SUAVE\Methods\Power\Battery\Cell_Cycle_Models\LiNiMnCoO2_cell_cycle_model.py", line 51, in compute_NMC_cell_state_variables
    V_ul           = np.atleast_2d(battery_data.Voltage(pts)[:,1]).T
AttributeError: 'NoneType' object has no attribute 'Voltage'

[Haoliang Yu]

Hello, regarding this issue, there are two solutions. 

The first one is to switch the lithium battery model used for the eVTOL to the basic model, Lithium_Ion. 

Another method is because a file was not installed during the package installation, as shown in the red box in the image. 

You need to copy the NMC_Raw_Data.res file from the download package to the specified package library. 

Wish you success!

Knight

[Rohan Sharma]

Hi Knight, 

If it's not too much to ask, do you mind sending over a link to that video tutorial? Even if it is presented in Chinese, I'd like to do my best to follow. 

Thanks!

-Rohan