Damping in Ansys

SaiPrasad Chowdavaram · October 13, 2021, 04:01

Hi all ...
I have a doubt .
I am working as FEA engineer working on Vibration problems . While performing Transient vibrational analysis there is an input that need to be provided in analysis settings of Ansys which is Damping . May I know
1. what is the percentage of damping that is to be used .
2. Is there any hard and fast rule to have specified damping percentage like 2% 3% ... If yes how to justify that.. how to calculate it theoretically .

Please help me in sorting out this doubt .

Thanks all in advance .

Thanks & Regards
Saiprasadchowdavaram

karachun · October 13, 2021, 12:11

Damping is a complex physical phenomenon. It depends both on material properties and more on the type of joints used in structure. For example riveted structures have more damping than welded.

There are no simple and universal methods to calculate damping. Usually damping is determined by experiment. There is a general rule of thumb to use 2-3%, without any theoretical grounding.

Try to check some codes for your structure. For example codes for seismic calculations of Nuclear power plants contain damping values for typical nuclear plant components like piping and engineers can use these damping values for their calculations.

SaiPrasad Chowdavaram · October 14, 2021, 03:06

Quote:

Originally Posted by karachun

Damping is a complex physical phenomenon. It depends both on material properties and more on the type of joints used in structure. For example riveted structures have more damping than welded.

There are no simple and universal methods to calculate damping. Usually damping is determined by experiment. There is a general rule of thumb to use 2-3%, without any theoretical grounding.

Try to check some codes for your structure. For example codes for seismic calculations of Nuclear power plants contain damping values for typical nuclear plant components like piping and engineers can use these damping values for their calculations.

Thankyou .

Please share more info if u have any .

karachun · October 14, 2021, 07:06

I mentioned enough information.

Selection of adequate damping is up to you.

October 13, 2021, 04:01	Damping in Ansys	#1
SaiPrasad Chowdavaram New Member SaiPrasad Join Date: Dec 2017 Posts: 17 Rep Power: 8	Hi all ... I have a doubt . I am working as FEA engineer working on Vibration problems . While performing Transient vibrational analysis there is an input that need to be provided in analysis settings of Ansys which is Damping . May I know 1. what is the percentage of damping that is to be used . 2. Is there any hard and fast rule to have specified damping percentage like 2% 3% ... If yes how to justify that.. how to calculate it theoretically . Please help me in sorting out this doubt . Thanks all in advance . Thanks & Regards Saiprasadchowdavaram

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October 13, 2021, 12:11		#2
karachun Senior Member Join Date: Nov 2015 Posts: 246 Rep Power: 12	Damping is a complex physical phenomenon. It depends both on material properties and more on the type of joints used in structure. For example riveted structures have more damping than welded. There are no simple and universal methods to calculate damping. Usually damping is determined by experiment. There is a general rule of thumb to use 2-3%, without any theoretical grounding. Try to check some codes for your structure. For example codes for seismic calculations of Nuclear power plants contain damping values for typical nuclear plant components like piping and engineers can use these damping values for their calculations.

October 14, 2021, 07:06		#4
karachun Senior Member Join Date: Nov 2015 Posts: 246 Rep Power: 12	I mentioned enough information. Selection of adequate damping is up to you.