×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Rotational velocity in modal analysis for cyclic symmetry

 Forum Search FAQs Links MVPs

## Rotational velocity in modal analysis for cyclic symmetry

(OP)
Hi,

I am doing analysis of a disc with blade in ANSYS Mechanical. Modeled one sector of disc along with one blade using cyclic symmetry. Cyclic symmetry is defined using cylindrical coordinate system.

As I want to generate Campbell diagram from modal analysis, I gave rotational velocity input at two different points (rpms).

There is a question mark on Rotational velocity input. ANSYS documentation says while defining rotational velocity in modal analysis, by default Global coordinate system (which is cartesian) will be chosen and it cannot be changed. And when using cyclic symmetry, the coordinate system given in rotational velocity should be cylindrical coordinate system and has to match with that of Global coordinate system (which is contradictory).

So can you please tell how to give rotational velocity input in modal analysis for a cyclic symmetric structure?

The relevant page in ANSYS documentation that explains these limitations is here, under definition category:
https://www.sharcnet.ca/Software/Ansys/17.0/en-us/...

Thank you,
Kiran

#### 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.

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

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!