cobra46
Mechanical
- Nov 6, 2003
- 76
Hi All,
Been having fun using the vibration side of SW simulation over the last couple months.
I am concerned about the modal analysis results on an aluminum billet housing assy. I ran the study out to 48 modes and they start at 538 Hz and go to 865 Hz. There are a lot of resonant frequencies over a quite narrow range. Does this seem strange to anyone else? Check out modes 30-36 below:
30 842.9
31 844.0
32 844.2
33 845.3
34 845.8
35 847.0
36 848.1
Being so close doesn't pass my sniff test but I am new to frequency analysis. What are your thoughts on this?
I have another question regarding how to setup the study to simulate my housing being mounted to a thicker more rigid plate. It seems many of the resonant shapes would be impossible if the housing was mounted to a thick plate. No penetration contact between the thick plate and my housing is not available with the frequency study. I was forced to simply fix the mounting holes.
Thanks,
Kevin
Been having fun using the vibration side of SW simulation over the last couple months.
I am concerned about the modal analysis results on an aluminum billet housing assy. I ran the study out to 48 modes and they start at 538 Hz and go to 865 Hz. There are a lot of resonant frequencies over a quite narrow range. Does this seem strange to anyone else? Check out modes 30-36 below:
30 842.9
31 844.0
32 844.2
33 845.3
34 845.8
35 847.0
36 848.1
Being so close doesn't pass my sniff test but I am new to frequency analysis. What are your thoughts on this?
I have another question regarding how to setup the study to simulate my housing being mounted to a thicker more rigid plate. It seems many of the resonant shapes would be impossible if the housing was mounted to a thick plate. No penetration contact between the thick plate and my housing is not available with the frequency study. I was forced to simply fix the mounting holes.
Thanks,
Kevin