Plotting plot_mode_3d

[rahultarale]

Hi,

Can you please help me to get the code to plot critical speed using plot_mode_3d. I have done it for modal analysis, but not able to figure out for critical speed.

for mode in range(0,5):
    fig3 = modal.plot_mode_3d(mode,frequency_type='wn',frequency_units='RPM')
    fig10 = modal.plot_orbit(mode,nodes=[0],frequency_type='wn',frequency_units='RPM')
    fig3.show()
    fig10.show()

[raphaeltimbo]

In rotating equipment the critical frequencies change with speed.
The best way to visualize this is using the Campbell diagram.

import ross as rs
import numpy as np


rotor = rs.rotor_example()
speed = np.linspace(0, 400, 101)
camp = rotor.run_campbell(speed)
camp.plot()

You can see that the first forward critical speed is at 96.30 rad/s.

Now you can run a modal analysis at this speed and then plot the mode shape for that critical speed:

modal = rotor.run_modal(speed=96.30)
modal.plot_mode_3d(1)

[rahultarale]

Thanks for the information

[FadliM21]

In rotating equipment the critical frequencies change with speed. The best way to visualize this is using the Campbell diagram.

import ross as rs
import numpy as np


rotor = rs.rotor_example()
speed = np.linspace(0, 400, 101)
camp = rotor.run_campbell(speed)
camp.plot()

You can see that the first forward critical speed is at 96.30 rad/s.

Now you can run a modal analysis at this speed and then plot the mode shape for that critical speed:

modal = rotor.run_modal(speed=96.30)
modal.plot_mode_3d(1)

In rotating equipment the critical frequencies change with speed. The best way to visualize this is using the Campbell diagram.

import ross as rs
import numpy as np


rotor = rs.rotor_example()
speed = np.linspace(0, 400, 101)
camp = rotor.run_campbell(speed)
camp.plot()

You can see that the first forward critical speed is at 96.30 rad/s.

Now you can run a modal analysis at this speed and then plot the mode shape for that critical speed:

modal = rotor.run_modal(speed=96.30)
modal.plot_mode_3d(1)

Hi Raphael,

I'm a beginner for Rotor dynamics. Can you please help me to understand the campbell plot? What is the meaning of Forward, Mixed and Backward in campbell legend?

[ViniciusTxc3]

@FadliM21 this topic will be addressed in the #1041, facilitating future discussions.