hserdogan94
commented
3 weeks ago The ball bearings are defined as below;
ballbearingR5 = rs.BallBearingElement( n=24, n_balls= 19, d_balls=8.731e-3, fs= 710, alpha=5*pi/36, tag='R5', )
ballbearingR5
ballbearingR4 = rs.BallBearingElement( n=25, n_balls= 19, d_balls=8.731e-3, fs= 710, alpha=5*pi/36, tag='R4', )
jguarato
Hello,
I encountered an issue when I was trying to look for Campbell plot. When I run the code I get an attribute error with development version of ROSS. Despite I defined n_balls attributes.
{ "name": "AttributeError", "message": "'BallBearingElement' object has no attribute 'n_balls'", "stack": "--------------------------------------------------------------------------- AttributeError Traceback (most recent call last) Cell In[17], line 3 1 samples = 31 2 speed_range = np.linspace(0, 1900, samples) ----> 3 camp = rotor3.run_campbell(speed_range,6,frequency_type='wn') 4 camp.plot(harmonics=[1, 2], frequency_units=\"Hz\")
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\units.py:194, in check_units..inner(*args, *kwargs)
191 else:
192 base_unit_kwargs[k] = v
--> 194 return func(base_unit_args, **base_unit_kwargs)
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\rotor_assembly.py:2458, in Rotor.run_campbell(self, speed_range, frequencies, frequency_type) 2456 modal_results = {} 2457 for i, w in enumerate(speed_range): -> 2458 modal = self.run_modal(speed=w, num_modes=2 * frequencies) 2459 modal_results[w] = modal 2461 if frequency_type == \"wd\":
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\units.py:194, in check_units..inner(*args, *kwargs)
191 else:
192 base_unit_kwargs[k] = v
--> 194 return func(base_unit_args, **base_unit_kwargs)
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\rotor_assembly.py:673, in Rotor.run_modal(self, speed, num_modes, sparse, synchronous) 613 @check_units 614 def run_modal(self, speed, num_modes=12, sparse=True, synchronous=False): 615 \"\"\"Run modal analysis. 616 617 Method to calculate eigenvalues and eigvectors for a given rotor system. (...) 671 >>> fig = modal.plot_mode_2d(mode2) 672 \"\"\" --> 673 evalues, evectors = self._eigen( 674 speed, num_modes=num_modes, sparse=sparse, synchronous=synchronous 675 ) 676 wn_len = num_modes // 2 677 wn = (np.absolute(evalues))[:wn_len]
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\units.py:194, in check_units..inner(*args, *kwargs)
191 else:
192 base_unit_kwargs[k] = v
--> 194 return func(base_unit_args, **base_unit_kwargs)
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\rotor_assembly.py:1367, in Rotor.eigen(self, speed, num_modes, frequency, sorted, A, sparse, synchronous) 1319 \"\"\"Calculate eigenvalues and eigenvectors. 1320 1321 This method will return the eigenvalues and eigenvectors of the (...) 1364 91.796... 1365 \"\"\" 1366 if A is None: -> 1367 A = self.A(speed=speed, frequency=frequency, synchronous=synchronous) 1369 if synchronous: 1370 evalues, evectors = la.eig(A)
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\rotor_assembly.py:1159, in Rotor.A(self, speed, frequency, synchronous) 1154 I = np.eye(self.ndof) 1156 # fmt: off 1157 A = np.vstack( 1158 [np.hstack([Z, I]), -> 1159 np.hstack([la.solve(-self.M(frequency, synchronous=synchronous), self.K(frequency)), la.solve(-self.M(frequency,synchronous=synchronous), (self.C(frequency) + self.G() * speed))])]) 1160 # fmt: on 1162 return A
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\rotor_assembly.py:1010, in Rotor.K(self, frequency, ignore) 985 \"\"\"Stiffness matrix for an instance of a rotor. 986 987 Parameters (...) 1006 [ 6., 0., 0., 1.]]) 1007 \"\"\" 1008 K0 = np.zeros((self.ndof, self.ndof)) -> 1010 elements = sorted(set(self.elements) - set(ignore), key=self.elements.index) 1012 for elm in elements: 1013 dofs = list(elm.dof_global_index.values())
File c:\Users\sssho\AppData\Local\Programs\Python\Python312\Lib\site-packages\ross\bearing_seal_element.py:420, in BearingElement.eq(self, other) 418 init_args_comparison = [] 419 for arg in init_args: --> 420 comparison = getattr(self, arg) == getattr(other, arg) 421 try: 422 comparison = all(comparison)
AttributeError: 'BallBearingElement' object has no attribute 'n_balls'" }