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DDVAL |
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DDVAL |
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»Click here to display Table of Contents«
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DDVAL |
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DDVAL |
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Bulk Data Entry
DDVAL – Discrete Design Variable Values
Description
This bulk data entry can be used to 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 |
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Alternate Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
DDVAL |
ID |
DVAL1 |
"THRU" |
DVAL |
"BY" |
INC |
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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) |
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DVAL8 |
DVAL9 |
DVAL10 |
DVAL11 |
-etc.- |
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Continuation Entry Format 2
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
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DVAL8 |
"THRU" |
DVAL9 |
"BY" |
INC |
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Field |
Contents |
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) |
| 1. | DDVAL entries must be referenced by: |
| • | the DDVAL field of a DESVAR bulk data entry |
| • | the SPTID field of a RSPINR bulk data entry |
| 2. | 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. |
| 3. | 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. |
| 4. | 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. |
| 5. | This card is represented as a discretedesignvariable in HyperMesh. |
See Also:
