eVTOL Tutorial

[Krrish Garg]

Hello Guys
i am facing this error while running eVTOL tutorial

Please advise if you know any solutions for it

Defaulting to scaled DAE51

Defaulting to scaled DAE51

 Optimum motor design failed. Using slack constraints
Traceback (most recent call last):
  File "c:\Users\Krrish\SUAVE\tut_eVTOL.py", line 592, in <module>
    main()
  File "c:\Users\Krrish\SUAVE\tut_eVTOL.py", line 48, in main
    results = mission.evaluate()
              ^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Mission\Segments\Segment.py", line 180, in evaluate
    self.process(self)
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 96, in __call__
    return self.evaluate(*args,**kwarg)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 67, in evaluate
    result = step(*args,**kwarg)
             ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Methods\Missions\Segments\Common\Sub_Segments.py", line 137, in sequential_sub_segments
    sub_segment.evaluate()
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Mission\Segments\Segment.py", line 180, in evaluate
    self.process(self)
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 96, in __call__
    return self.evaluate(*args,**kwarg)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 65, in evaluate
    result = step.evaluate(*args,**kwarg)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 67, in evaluate
    result = step(*args,**kwarg)
             ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Methods\Missions\Segments\converge_root.py", line 50, in converge_root
    unknowns,infodict,ier,msg = root_finder( iterate,
                                ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\scipy\optimize\_minpack_py.py", line 166, in fsolve      
    res = _root_hybr(func, x0, args, jac=fprime, **options)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\scipy\optimize\_minpack_py.py", line 232, in _root_hybr  
    shape, dtype = _check_func('fsolve', 'func', func, x0, args, n, (n,))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\scipy\optimize\_minpack_py.py", line 29, in _check_func  
    res = atleast_1d(thefunc(*((x0[:numinputs],) + args)))
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Methods\Missions\Segments\converge_root.py", line 99, in iterate
    segment.process.iterate(segment)
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 96, in __call__
    return self.evaluate(*args,**kwarg)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 65, in evaluate
    result = step.evaluate(*args,**kwarg)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Process.py", line 67, in evaluate
    result = step(*args,**kwarg)
             ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Methods\Missions\Segments\Common\Energy.py", line 87, in update_thrust
    results   = energy_model.evaluate_thrust(segment.state)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Analyses\Energy\Energy.py", line 65, in evaluate_thrust
    results = network.evaluate_thrust(state)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Components\Energy\Networks\Network.py", line 143, in evaluate_thrust
    results_p = net.evaluate_thrust(state)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Components\Energy\Networks\Lift_Cruise.py", line 167, in evaluate_thrust
    volts = battery.compute_voltage(state)  
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.egg\SUAVE\Components\Energy\Storages\Batteries\Constant_Mass\Lithium_Ion_LiNiMnCoO2_18650.py", line 432, in compute_voltage
    V_ul_cell = compute_NMC_cell_state_variables(battery_data,SOC,T_cell,I_cell)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Krrish\AppData\Local\Programs\Python\Python311\Lib\site-packages\suave-2.5.2-py3.11.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'
PS C:\Users\Krrish\SUAVE> 

[Ilayaraja Ramasamy]

Change the Battery type to LIPO or something else and try. It worked.