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Ansys - which analysis system to use?

by atyy88
Tags: analysis, ansys
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atyy88
#1
Apr3-13, 06:02 AM
P: 5



The pressure will push component "a" to move downwards and push component "b" to move upwards.

Component "a" and "b" will only be moved in vertical direction (90degree).

There will be friction force occurs on the sliding surface which will push component "c" to move to the right >>>

Does anyone knows which analysis system(Workbench) I have to use to do my FEA on this model?
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CFDFEAGURU
#2
Apr3-13, 07:45 AM
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P: 723
First off, simplify the model. You can do this by only modeling the surfaces that are in contact and then applying a force. Use Traditional. Read about the contacts in the ANSYS help manual. There is no need to pull that entire assembly into WorkBench.

Thanks
Matt
atyy88
#3
Apr3-13, 09:21 AM
P: 5
Thanks for you reply Matt.
I'll read the manual and try to figure something out.
By the way my drawing is done by using SolidWorks. I tried to use the simulation system in Solidworks but it says cannot be run for assembly parts. So i'm trying Ansys now.

CFDFEAGURU
#4
Apr3-13, 09:27 AM
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Ansys - which analysis system to use?

I don't know what version of ANSYS you are using but in version 14.0 you can find the details of contacts in the Contact Technology Guide.

Also in the help manual under Verification Manual there is verification file, VM29 that outlines sliding friction on a block. You can view and/or read in the VM29.dat file and modify it as needed.

The results are going to be shown in the black output window. You can also use the Mechanical APDL Launcher and use the batch mode.
atyy88
#5
Apr3-13, 09:13 PM
P: 5
Yes i'm using Ansys 14.0.
I have some ideas on workbench only because one of my classmate showed me a demo on it.
This is my first time using Ansys (traditional). I don't even know how to create a modeling.
Can you guide me a bit?
Can I import my Solidworks drawing file to do the Contacts?
atyy88
#6
Apr3-13, 09:21 PM
P: 5


Is this the one for doing contacts?
CFDFEAGURU
#7
Apr4-13, 07:12 AM
CFDFEAGURU's Avatar
P: 723
Importing geometry into ANSYS Traditional is a 50/50 gamble. If it comes in, you will have to verify that everything is connected/restrained properly. I wouldn't waste my time trying to import anything.

What you need to do is create the simple geometry of the two sliding blocks. Have you followed the VM29.dat file?

Read about the /INPUT command in the help manual. Copy and past the VM29.dat file into a text editor, save it to a location, point ANSYS at that location (use the Mechanical APDL Launcher) and then either type in /INPUT (with the appropriate information) in the command line to read the file in. Or you can also copy and paste all the commands from the VM29.dat file and paste them directly into the command line. I am assuming you know where the command line is.

If you have never used Traditional, then you shouldn't be using Workbench. Use the help manual and the example verification files to begin to learn and understand APDL. There is a log file that you can view (similar to recording a macro in VBA) and this will tell you what APDL command is being used as you point and click. Refer to this file as you build your model.

Also, ask yourself, "What am I trying to accomplish with this analysis and how can I simplify this large assembly into a much more manageable problem?" If you are just looking to create a pretty picture with color contours, your doing your analysis for all the wrong reasons.
atyy88
#8
Apr4-13, 10:45 PM
P: 5
No..... I'm not just looking to create a pretty picture with color contours.

I'm actually designing a jacking system for offshore platform which uses hydraulic pressure to move the components and then it will generate friction force to move another components(clamping units), instead of using rack and pinion system.

So I have to do analysis on the friction/reaction forces for my design.

The dimension of the drawing i showed on the first post is actually very large.

I had read the manual that you said but I couldn't get to learn the ANSYS traditional in this short time. I'm quite in rush to get the analysis results.

Do you have any idea how to do it with Workbench?
CFDFEAGURU
#9
Apr5-13, 06:19 AM
CFDFEAGURU's Avatar
P: 723
Quote Quote by atyy88 View Post
I had read the manual that you said but I couldn't get to learn the ANSYS traditional in this short time. I'm quite in rush to get the analysis results.

Do you have any idea how to do it with Workbench?
No, I do not work with Workbench. Without any experience, you should consult an engineering firm that specializes in FEA. Or get help from someone who is experienced and can literally sit right next to you and guide you thru this analysis.

I hope it all works out for you.

Thanks
Matt


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