shell meshing

[Gerry968]

Hi All,


I have just created some mid-surfaces for a part, but these surfaces don't connect as they are slightly offset from each other. Is it possible to create a connecting mesh between two seperatesurfaces/shells in Mechanica mode? If so, how is it done?


Another question on the same part. I wish to do vibration analysis on the assembly, but theassembly is constrained at the exact same location as where the load is applied. I am doing the analysis on a car mirror, where the mirror is constrained at one end, but the load also is transferred through this end. Does anyonehave any tips on this? Using Wildfire 2.0.


Ger

 

[ndk]

use end weld, parameter weld to close the gap when compressing to midsurface.

 

[Gerry968]

Thanks for the help, ndk, I managed to get my assembly meshed.


Just on the second question, I am looking to do vibration analysis on the car mirror shown below.


View attachment 870


The mirror is connected to the windscreen via area A. I am looking to run a vibration analysis on the mirror, where the vibration source is from the windscreen of a moving car. The mirror has to be constrained at area A, while a sinusoidal vibration load must pass through the same area. Does anyone have any suggestions on how to set this up in Mechanica mode?


Ger.

 

[ndk]

It seems that you have to perform a vibration analysis, where the bases (contrained areas) vibrated and generating stress through the model. You can refer to this previous post for information:


[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=25 012&PN=8[/url]


Hope that helpful

 

[Gerry968]

Thanks again ndk,


Just a quick question on running a dynamic frequency analysis. How would you apply a 1G acceleration to the model and where then will I find the modal frequencies?


Also, does anyone have any step by step tutorials on running a vibrational analysis on a model?


Ger.

 

[rodgiles]

You will need to carry out a modal analysis before doing a vibration analysis. If you want to apply a 1G load through the constraints, then you need to do a 'base excitation' analysis. This simulates a part being vibrated on a shaker table, so it is the most common type of vibration analysis carried out. Then you will need to determine your frequency range and your forcing function. For a 1G sweep, just use a uniform forcing function and use a value of 1G (=9810 mm/s^2) in the direction you want apply the acceleration in.


I have more info on my web-site. Go to [url]www.elite-consulting.com/pro%20mechanica%20hints%20tips%20tr icks.htm[/url]and download the Analysis of Valve Mounting Duct presentation.


Cheers,


Rod

 

[Gerry968]

Thanks for the help, guys. I'm getting good results here.


Ger.