how to include damping in a shock study

• Dec 18, 2022

• #2

FEA way

Mechanical

Nov 13, 2018

5,183

PL

Response spectrum analysis will be the right choice in this case. Damping can be specified in material properties.

 

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• Dec 18, 2022

• Thread starter
• #3

cobra46

Mechanical

Nov 6, 2003

76

US

Duh - I now recall seeing this option if I use CQC.

I think I forgot about this because not all my materials have a damping factor specified in the material properties and wanted to globally set it like I did in my random study. It won't be too hard to go in and artificially set them all to 5% which the customer wants.

Thanks for the quick response. My Monday will be much smoother now.

 

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• Jan 10, 2023

• #4

statist1

Aerospace

Oct 10, 2020

3

TR

Hi. Response spectrum is conservative analysis, which calculate quickly. You use damping for get the level of load. It's analysis not simple how look.
You need to read this article of mr. Irvine:

https://www.vibrationdata.com/tutorials2/srs_intr.pdf

You also can use transient analysis for shock.

 

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• Jan 10, 2023

• #5

FEA way

Mechanical

Nov 13, 2018

5,183

PL

When it comes to literature, I'd also recommend "Response Spectrum Method in Seismic Analysis and Design of Structures" by A.K. Gupta.

 

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• Jan 10, 2023

• #6

statist1

Aerospace

Oct 10, 2020

3

TR

I recommend too Christian Lalanne(auth.) - Mechanical Shock_ Mechanical Vibration and Shock Analysis, Volume 2, Second Edition (2009, Wiley-ISTE)
In this book also explayning responce spectrum analysis for shock. The problem is precisely in getting the load. To do this, you need to use another application.

 

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