Download Usfos User`s Manual (Chp. 6(I))

6.3-20
USFOS USER’S MANUAL
Input Description USFOS Control Parameters
DampData
Damp_ID
Type
[ Data ]
Parameter
Description
Default
Damp_ID
Type
ID to be referred to from ELEMDAMP
Kind of Damping data. Actual Types:
Rayl_All : Common data for all 6 dofs. Data:
Rayl_Ind: Individual data for the dofs. Data:
alpha1 & alpha2
alpha1 & alpha2 (Dof1)
alpha1 & alpha2 (Dof6)
Alfa1 and 2: Rayleigh Coefficients (see under RaylDamp for more info)
With this record the the user may specify general damping to be be referred to from individual
elements used in a Dynamic Analysis..
Example 1
'
DampID DampType
DampData 10010
Rayl_All .
DampData 10011
Rayl_All .
alpha1 alpha2
0.0
3.0E-4
1.0E-2 3.0E-4
Two damping data packets are defined. One with stiffness proportional damping only and one with
both mass- and stiff proportional damping.
This record could be repeated.
ElemDamp
Damp_ID
ListType [ Id-List ]
Parameter
Description
Damp_ID
ListType
Actual Damping Property ID
Actual
Element :
Element ID list
Material :
Material ID list
All
:
All elements are given the actual damping properties
ID-List
Actual List of ID’s
Default
With this record the the user may specify general damping to be be referred to from individual
elements used in a Dynamic Analysis..
Example 1
'
DampID
ElemDamp 10010
ElemDamp 10011
ListType ID_List
All
Mat
200
300
! Assign Damp Prop 10010 to all elements
! Assign to special thereafter
With this record, damping for each element is defined.
NOTE ! This record is an extended alternative to the RAYLDAMP input, and override data
specified under the RAYLDAMP input.
This record could be repeated.
2010-01-01