DDVAL
Bulk Data Entry Define real, discrete design variable values for discrete variable optimization or to define relative rotor spin rates in rotor dynamics.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| DDVAL | ID | DVAL1 | DVAL2 | DVAL3 | DVAL4 | DVAL5 | DVAL6 | DVAL7 |
Alternate Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| DDVAL | ID | DVAL1 | "THRU" | DVAL | "BY" | INC |
The continuation entry formats (shown below) may be used more than once, and in any order. They may also be used with either format above.
Continuation Entry Format 1
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| DVAL8 | DVAL9 | DVAL10 | DVAL11 | etc. |
Continuation Entry Format 2
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| DVAL8 | "THRU" | DVAL9 | "BY" | INC |
Example
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| DDVAL | 110 | 0.1 | 0.2 | 0.3 | 0.5 | 0.6 | 0.4 | ||
| .7 | thru | 1.0 | by | 0.05 | |||||
| 1.5 | 20 |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| ID | Unique discrete value set
identification number. (Integer > 0) |
|
| DVALi | Discrete values. The
DVALi sequence can be random. (Real or "THRU" or "BY") |
|
| INC | Discrete value
increment. (Real) |
Comments
- DDVAL entries must be referenced by:
- If the bounds on DESVAR cards (either XLB and/or XUB) are wider than those given by the discrete list of values on the corresponding DDVAL entry, XLB and/or XUB on DESVAR will be replaced by the minimum and maximum discrete values.
- Trailing fields on a DDVAL record can be left blank if the next record is of type DVALi "THRU" DVALj "BY" INC. Also, fields 7 through 9 must be blank when the type DVALi "THRU" DVALj "BY" INC is used in fields 2 through 6. Fields 8 through 9 must be blank when the type DVALi "THRU" DVALj "BY" INC is used in fields 3 through 7 for the first record. Embedded blanks are not permitted in other cases.
- The format DVALi "THRU" DVALj "BY" INC defines a list of discrete values, for example, DVALi, DVALi+INC, DVALi+2.0*INC, …, DVALj. The last discrete DVALj is always included, even if the range is not evenly divisible by INC.
- This card is represented as a discrete design variable in HyperMesh.