after reading also Blade mode shapes with BModes - #2 by Jason.Jonkman I have a question why you would recommend setting both flap and edge inertias to zero for mode shape determination. In my understanding the proper combination of mass and stiffness would lead to the correct eigenfrequencies and mode shapes, so I am a bit confused why you suggest setting the inertias to (almost) zero. Or will the mode shape purely be calculated out of the mass distribution?
There is another thing that just came to my mind: you said that you usually use rated rotation speed for mode shape determination, but in the thread referenced above Xiao Sun stated:
which hasn’t been answered yet. So would you advise to use rated rotor speed or zero rotor speed for the mode shape determination with BModes? Considering that mode shapes match best at zero rpm while the frequencies might be more accurate at rated rotor speed…