×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Error in Harmonic analysis - Mode superposition method- ANSYS workbench

Error in Harmonic analysis - Mode superposition method- ANSYS workbench

Error in Harmonic analysis - Mode superposition method- ANSYS workbench

(OP)
Hi,

I am performing mode superposition method harmonic analysis in ANSYS workbench v14. My component is attached to a large mass (1E6 times the component mass) and the large mass is released in z-direction. In modal analysis I have provided modal damping and Freq Vs. Force (Large mass* acceleration in g *9.81) excitation curve using APDL commands (to support this I have added a remote force at the large mass remote point and provided a dummy force in z-direction). The modal analysis soln. is linked to harmonic analysis to perform mode superpostion harmonic analysis. The harmonic analysis result(.rst) is opened in Mechanical APDL. When I extract the acceleration at the input excitation point (large mass) the excitation curve is followed, thus verifying the run.

Later, I added few point masses to the analysis which is connected to some surfaces in the model. These point masses are defined as deformable. When I extracted the results for the second model, I find the results are bogus. Even the input excitation curve at the largemass is not observed, I observe the input is very large where the component goes to 1e9 meter displacement. This error is not observed when the point masses are suppressed and the results makes sense. Please let me know if anyone encountered similar error.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources