×
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

# Time vs acceleration input2

 Forum Search FAQs Links MVPs

## Time vs acceleration input

(OP)
Dear all,
I am using ANSYS 15.0 mechanical. I have a query that is it possible in ANSYS to input “time Vs acceleration” history as an input?
I know that pressure, displacement time history can be given as input using “Existing table” option in ANSYS , similarly can I use ACEL command ? .ANSYS help mentions that The ACEL command supports tabular boundary conditions but there is no option available like “existing table” .How I can do that?
I would appreciate, if anybody helps me in this.
Thank you very much in advance.

Regards,
sachin46

### RE: Time vs acceleration input

There are many posts in this forum about this already - do a search. But in summary, in version 15 you are able to input an acceleration time history using the "D" command (see the manual and the "ACCX", "ACCY", "ACCZ" labels). You will need to read each time history into ANSYS as either a TABLE or an ARRAY. My preferred method is using a TABLE (see the *DIM and the *TREAD commands). Be sure to have two columns of data to read in for each component (time and ACCX) and size (*DIM) the TABLE as 1 column and n rows where n is the length of your time history trace). This will place the time column in the zeroth (0th) column. When you've read the data in, you can refer to the TABLE name by enclosing the TABLE name in "%" signs in the D command i.e. let's assume your TABLE is named "THISTORYx" (the x-component of the history) and you want to apply this to node 100, then:

#### CODE -->

D,100,ACCX,%THISTORYx%

Good luck.

------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

### RE: Time vs acceleration input

I do not get access to the program right now, think you can try the following commands.

*DIM,XACEL,TABLE,140,2 !Define a table "XACEL" and assume there are 140 acceleration data pair

*VREAD,XACEL,RILE_NAME,TXT,,,140,2 !Read the acceleration date from "FILE_NAME.txt" to the table

ACEL,%XACEL_X% !Apply the acceleration

### RE: Time vs acceleration input

(OP)
Dear Drej & jiang46602

Thank you very much for your valuable reply. As Mr.Drej suggested to use "D" command I read manual which has mentioned that tabular boundary condition can be used to input Acceleration vs time history. But in case of GUI there is no option of ACCX in Lab 2 which means to input this history I have to use command prompt?

As Jiang suggested ACEL command ,will effect of both commands will be same? because through ACEL command it is mentioned in manual that we can use it for tabular boundary condition.waiting for reply.
Once again thank you very much for your help

regards,
SACHIN

### RE: Time vs acceleration input

ACEL is a body load (typically used to apply gravity) and not something usually associated with a time history record (if that is what you have). Create an input deck and read all of the commands in using File > read input from... in the GUI.

------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

#### 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!

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!

Already a member? Close this window and log in.