HyperSizer Support Forum

Software Use => Analyzing & Optimizing Stiffened Panels => Topic started by: eric on January 05, 2015, 02:11:54 PM

Title: Adding mass to a stiffened panel
Post by: eric on January 05, 2015, 02:11:54 PM

I'm looking to determine isogrid dimensions from a frequency requirement using a Non-FEA project.  I need to account for the mass of a component that attaches to the panel when determining the frequency.  I tried to use "Added Weight", but there is no effect on the component structure when an analysis is completed with a non-trivial amount of additional mass.  Any insight?

Thanks!
Eric

Title: Re: Adding mass to a stiffened panel
Post by: James on January 05, 2015, 02:23:12 PM

The "Added Weight" does not feed into the panel frequency analysis. It probably should.

You can use the Bond Weight (units = lb/ft^2) on the Project Sizing Form > Options Tab > Constants which will increase the mass that is used in the panel frequency analysis.

-James

Title: Re: Adding mass to a stiffened panel
Post by: eric on January 05, 2015, 02:34:45 PM

Adding it as bond weight (any or all of three options) doesn't seem to impact the results either.

Title: Re: Adding mass to a stiffened panel
Post by: James on January 05, 2015, 02:58:07 PM

The local frequency will be unaffected but the panel frequency should account for the added bond weight. What panel concept is this?

Title: Re: Adding mass to a stiffened panel
Post by: eric on January 05, 2015, 03:04:14 PM

This is an isogrid concept.  I'm only looking at panel frequencies.

Title: Re: Adding mass to a stiffened panel
Post by: James on January 05, 2015, 03:24:16 PM

You're right. It's not working correctly for metallic isogrid. Two workaround that I can think of would be...
1. Scale the material density
2. Smear the extra weight into the skin by increasing the skin thickness

#2 seems easier..