# \*DAMPING,STRUCTURAL= for \*DYNAMIC
**URL:** https://calculix.discourse.group/t/damping-structural-for-dynamic/2271
**Category:** Uncategorized
**Created:** [May 13, 2024, 3:35pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271 "2024-05-13T15:35:46Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@calc4fem](https://calculix.discourse.group/u/calc4fem)
#### Post date: [May 13, 2024, 3:35pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/1 "2024-05-13T15:35:46Z")
Looks like it doesn’t damping?
Help says “… This card must be part of
a material description.” what is not completely clear
For example for previous topic with simple amplitude
---
### Author:  [@JuanP74](https://calculix.discourse.group/u/JuanP74)
#### Post date: [May 13, 2024, 3:41pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/2 "2024-05-13T15:41:39Z")
Hello, could you plot the input load?
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### Author:  [@calc4fem](https://calculix.discourse.group/u/calc4fem)
#### Post date: [May 13, 2024, 4:55pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/3 "2024-05-13T16:55:50Z")
```auto
*NODE,NSET=NALL
1,0.,0.,0.
2,1.,0.,0.
3,2,0,0
*ELEMENT,TYPE=SPRINGA,ELSET=ESpring
1,1,2
*ELEMENT,TYPE=B31,ELSET=Emass
2,2,3
*BOUNDARY
1,1,3
2,2,3
3,2,3
*SPRING,ELSET=Espring
768310.
*MATERIAL,NAME=EL
*ELASTIC
2.1e11,.3
*DENSITY
1130
*DAMPING,STRUCTURAL=0.1
*beam section, elset=Emass,material=EL,section=rect
1,1
*AMPLITUDE,NAME=StartAndStop
0,0,1,1,10,1
*TIME POINTS,NAME=T1,GENERATE
0,10,0.005
*step, nlgeom, inc=100000000
*dynamic
0.0001,10,1.0E-08,2.0E-03
*CLOAD,AMPLITUDE=StartAndStop
3,1,213184
**Displacements
*node file,timepoints=T1
u
*endstep
```
---
### Author:  [@Calc\_em](https://calculix.discourse.group/u/Calc_em)
#### Post date: [May 13, 2024, 5:29pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/4 "2024-05-13T17:29:47Z")
Structural damping should be used only in SSD analyses:
> This card is used to define Rayleigh damping for implicit and explicit dynamic calculations (\*DYNAMIC) and structural damping for steady state dynamics calculations (\*STEADY STATE DYNAMICS).
---
### Author:  [@JuanP74](https://calculix.discourse.group/u/JuanP74)
#### Post date: [May 13, 2024, 7:05pm UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/5 "2024-05-13T19:05:21Z")
Not sure if input is same as in your previous post…[\*dynamic - weird results - #11 by JuanP74](https://calculix.discourse.group/t/dynamic-weird-results/2266/11)
---
### Author:  [@calc4fem](https://calculix.discourse.group/u/calc4fem)
#### Post date: [May 14, 2024, 11:22am UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/6 "2024-05-14T11:22:27Z")
yes, it is the same thing, but different amplitude.
So, as far as it is true, the only way to use Rayleigh
> **[Computing Rayleigh Damping Coefficients | Knowledge Base | SimScale](https://www.simscale.com/knowledge-base/rayleigh-damping-coefficients/)**
>
> Learn how to compute the coefficients for the rayleigh damping model for harmonic and dynamic FEA simulations in SimScale.
---
### Author:  [@Calc\_em](https://calculix.discourse.group/u/Calc_em)
#### Post date: [May 14, 2024, 11:28am UTC](https://calculix.discourse.group/t/damping-structural-for-dynamic/2271/7 "2024-05-14T11:28:18Z")
Yeah, in Abaqus this type of damping is also supported only in a few linear dynamics procedures. The problem is that CalculiX doesn’t warn about an incorrect usage of this keyword.