GENEL
Bulk Data Entry Defines the stiffness, flexibility, mass, viscous damping, or structural damping of a general element connected to an arbitrary number of grids.
Format (Stiffness Matrix)
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | EID | GI1 | CI1 | GI2 | CI2 | GI3 | CI3 | ||
GI4 | CI4 | GI5 | CI5 | etc. | |||||
UD | GD1 | CD1 | GD2 | CD2 | GD3 | CD3 | |||
GD4 | CD4 | GD5 | CD5 | etc. | |||||
K or Z | KZ11 | KZ12 | KZ13 | etc. | KZ21 | KZ22 | etc. | ||
KZ31 | KZ32 | etc. | |||||||
S | S11 | S12 | S13 | etc. | S21 | S22 | etc. | ||
S31 | S32 | etc. |
Format (Mass Matrix)
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | EID | GI1 | CI1 | GI2 | CI2 | GI3 | CI3 | ||
GI4 | CI4 | GI5 | CI5 | etc. | |||||
M | M11 | M21 | M31 | etc. | M22 | M32 | etc | ||
M33 | M43 | etc. |
Format (Viscous Damping Matrix)
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | EID | GI1 | CI1 | GI2 | CI2 | GI3 | CI3 | ||
GI4 | CI4 | GI5 | CI5 | etc. | |||||
B | B11 | B21 | B31 | etc. | B22 | B32 | etc | ||
B33 | B43 | etc. |
Format (Structural Damping Matrix)
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | EID | GI1 | CI1 | GI2 | CI2 | GI3 | CI3 | ||
GI4 | CI4 | GI5 | CI5 | etc. | |||||
K4 | K411 | K421 | K431 | etc. | K422 | K432 | etc | ||
K433 | K443 | etc. |
Example 1
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | 537 | 1001 | 1 | 1001 | 2 | 1001 | 3 | ||
1002 | 1 | 1002 | 2 | 1002 | 3 | ||||
K | 5757. | -816.6 | -43.1 | -5757. | 816.6 | 43.1 | 35479.3 | ||
-1151. | 816.6 | -35479.3 | 1151. | 6538.6 | 43.1 | 1151. | -6538.6 | ||
5757. | -816.6 | -43.1 | 35479.3 | -1151. | 6538.6 |
Example 2
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | 4001 | 1073 | 1 | 1073 | 2 | 1073 | 3 | ||
1073 | 4 | 1073 | 5 | 1073 | 6 | ||||
UD | 1074 | 1 | 1074 | 2 | 1074 | 3 | |||
1074 | 4 | 1074 | 5 | 1074 | 6 | ||||
Z | .592-6 | .39-6 | .592-6 | ||||||
-.39-6 | .1-9 | ||||||||
.319-6 | .319-6 | .1-9 |
Example 3
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | 435 | 11 | 1 | 23 | 4 | 72 | 0 | ||
17 | 2 | ||||||||
S | 1.7 | 2.3 | 3.6 | 4.4 | 5.2 | 6.8 | 7.1 | ||
8.9 | |||||||||
K | .1 | .2 | .3 | .4 | .5 | .6 | .7 | ||
.8 | |||||||||
UD | 12 | 2 | 47 | 0 |
Example 4
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
GENEL | 435 | 11 | 1 | 23 | 4 | 72 | 0 | ||
17 | 2 | ||||||||
M | 2.1 | 3.2 | 1.8 | 2.2 | 0.9 | 1.2 | 3.1 | ||
0.89 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
EID | Unique element
identification number. No default (Integer > 0) |
|
GIi/CIi | Grid (or scalar point) and
component identification numbers ordered according to stiffness or
flexibility values specified after KZmn. For
scalar points, CIi is zero. No default (GIi is integer > 0 and CIi is integer > 0) |
|
UD | Flag indicating that the
subsequent fields and continuation entries contain values for
GDj/CDj until
K, Z, or
S is specified in field 2 or it is the end of
the entry. No default (Character) |
|
GDj/CDj | Grid (or scalar point) and
component identification numbers ordered according to the columns in
the S matrix. No default (GDj is integer > 0 and CDj is integer ≥ 0) |
|
K or Z | Flag indicating that the
next fields and continuation entries contain stiffness values until
UD or S is specified in
field 2 or it is the end of the entry. No default (Character) |
|
KZmn | Stiffness or flexibility
matrix for degrees-of-freedom in
GIi/CIi where
m is the row number and n
is the column number. Only the lower triangular terms in the matrix
need to be specified. Zero values must be specified as blank or
0.0. Default = 0.0 (Real) |
|
S | Flag indicating that the
subsequent fields and continuation entries contain values for the
S matrix. No default (Character) |
|
Sij | S
matrix values where I corresponds to
GIi/CIi list and
j corresponds to
GDj/CDj list until
K, Z, or
UD is specified in field 2 or it is the end
of the entry. All the terms in the matrix must be specified and zero
values must be specified as blank or 0.0. Default = 0.0 (Real) |
|
Mass Matrix: 8 9 10 | ||
GIi/CIi | Grid (or scalar point) and
component identification numbers ordered according to mass values
specified in Mmn. No default (GIi is Integer > 0 and CIi is Integer ≥ 0) |
|
M | Flag indicating that the
next fields and continuation entries contain mass values until it is
the end of the entry. No default (Character) |
|
Mmn | Mass matrix for
degrees-of-freedom in GIi/CIi
where “m” is the row number and
“n” is the column number. Only the lower
triangular terms in the matrix need to be specified. Zero values
must be specified as blank or 0.0. Default = 0.0 (Real) |
|
Viscous Damping Matrix: 8 9 10 | ||
GIi/CIi | Grid (or scalar point) and
component identification numbers ordered according to viscous
damping values specified in Bmn. No default (GIi is Integer > 0 and CIi is Integer ≥ 0) |
|
B | Flag indicating that the
next fields and continuation entries contain viscous damping values
until it is the end of the entry. No default (Character) |
|
Bmn | Viscous damping matrix for
degrees-of-freedom in GIi/CIi
where “m” is the row number and
“n” is the column number. Only the lower
triangular terms in the matrix need to be specified. Zero values
must be specified as blank or 0.0. Default = 0.0 (Real) |
|
Structural Damping Matrix: 8 9 10 | ||
GIi/CIi | Grid (or scalar point) and
component identification numbers ordered according to structural
damping values specified in K4mn. No default (GIi is Integer > 0 and CIi is Integer ≥ 0) |
|
K4 | Flag indicating that the
next fields and continuation entries contain structural damping
values until it is the end of the entry. No default (Character) |
|
K4mn | Structural damping matrix
for degrees-of-freedom in
GIi/CIi where
“m” is the row number and
“n” is the column number. Only the lower
triangular terms in the matrix need to be specified. Zero values
must be specified as blank or 0.0. Default = 0.0 (Real) |
Comments
- GIi/CIi and KZmn are required inputs. Either K or Z must be specified, but not both.
- UD, K, Z, and S, may be specified in any order as demonstrated in the third example.
- UD and
S are optional inputs. S defines the
motion between the GIi/CIi and
GDj/CDj degrees-of-freedom according
to:
But if S is specified, then GDj/CDj must also be specified. If S is not specified, then GDj/CDj may contain six and only six degrees-of- freedom and they cannot refer to SPOINTs.
- If
only K or Z is input without
UD, then it is recommended that the resulting stiffness
represents the unsupported element, containing all of the rigid body modes. If not,
the UD option allows for the reintroduction of the rigid body
modes with S which is provided by you or computed internally.
- If
and UD are specified,
the program will form the complete stiffness as defined
by:
Where, the matrix is formed from the KZmn values and the S matrix is formed from the Sij values or computed automatically.
- If Z and UD are specified, then the
program will form the complete stiffness as defined by:
Where, the Z matrix is formed from the KZmn values and the S matrix is formed from the Sij values or computed automatically. Z must be nonsingular.
- If
and UD are specified,
the program will form the complete stiffness as defined
by:
- PARAM, CK3 may be used to scale the stiffness produced by all GENEL elements.
- All lower triangular values in K and Z and all values in S have to be accounted for in the input. Zero values may be specified as 0.0 or be left blank, however if all entries in any continuation line are zero, then at least one visible character must appear on this line (it can be 0.0 in any field or the plus sign (+) in the first column) because blank lines are treated as comment. Unused fields (after the last matrix entry) must be blank.
- General elements are ignored in heat transfer analysis.
- GIi/CIi and Mmn (or Bmn/K4mn) are required inputs.
- “UD” and “S” should not be defined along with Mass, Viscous Damping, or Structural Damping matrices.
- Only lower triangular terms in the matrix should be input.