SCIP
Solving Constraint Integer Programs
Detailed Description
Coil Compression String Design model.
This example shows how to setup quadratic and nonlinear constraints in SCIP when using SCIP as callable library. The example implements a model for the design of a coil compression string as it can be found in the GAMS model library: http://www.gams.com/modlib/libhtml/spring.htm
The task is to find a minimum volume of a wire for the production of a coil compression spring.
Original model source:
- E. Sangren
Nonlinear Integer and Discrete Programming in Mechanical Design Optimization
Journal of Mechanical Design, Trans. ASME 112 (1990), 223-229
Definition in file string.c.
Go to the source code of this file.
Macros | |
| #define | M_PI 3.141592653589793238462643 |
| #define | nwires 11 |
Functions | |
| static SCIP_RETCODE | setupProblem (SCIP *scip) |
| static SCIP_RETCODE | runString (void) |
| int | main (int argc, char **argv) |
Variables | |
| static const SCIP_Real | diameters [] = { 0.207, 0.225, 0.244, 0.263, 0.283, 0.307, 0.331, 0.362, 0.394, 0.4375, 0.500 } |
| static const SCIP_Real | preload = 300 |
| static const SCIP_Real | maxworkload = 1000 |
| static const SCIP_Real | maxdeflect = 6 |
| static const SCIP_Real | deflectpreload = 1.25 |
| static const SCIP_Real | maxfreelen = 14.0 |
| static const SCIP_Real | maxcoildiam = 3.0 |
| static const SCIP_Real | maxshearstress = 189000.0 |
| static const SCIP_Real | shearmod = 11500000.0 |
Macro Definition Documentation
◆ M_PI
| #define M_PI 3.141592653589793238462643 |
Definition at line 42 of file string.c.
Referenced by setupProblem().
◆ nwires
| #define nwires 11 |
Function Documentation
◆ setupProblem()
|
static |
sets up problem
- Parameters
-
scip SCIP data structure
Definition at line 81 of file string.c.
References deflectpreload, diameters, FALSE, M_PI, maxcoildiam, maxdeflect, maxfreelen, maxshearstress, maxworkload, NULL, nwires, preload, SCIP_CALL, SCIP_EXPR_DIV, SCIP_EXPR_INTPOWER, SCIP_EXPR_VARIDX, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_BINARY, SCIP_VARTYPE_CONTINUOUS, SCIP_VARTYPE_INTEGER, SCIPaddBilinTermQuadratic(), SCIPaddCoefLinear(), SCIPaddCons(), SCIPaddQuadVarLinearCoefQuadratic(), SCIPaddSquareCoefQuadratic(), SCIPaddVar(), SCIPblkmem(), SCIPchgVarLb(), SCIPchgVarUb(), SCIPcreateConsBasicLinear(), SCIPcreateConsBasicNonlinear(), SCIPcreateConsBasicQuadratic(), SCIPcreateConsBasicSetpart(), SCIPcreateProbBasic(), SCIPcreateVarBasic(), SCIPexprCreate(), SCIPexprCreateLinear(), SCIPexprCreateMonomial(), SCIPexprCreatePolynomial(), SCIPexprtreeCreate(), SCIPexprtreeFree(), SCIPexprtreeSetVars(), SCIPinfinity(), SCIPreleaseCons(), SCIPreleaseVar(), SCIPsnprintf(), shearmod, and y.
Referenced by runString().
◆ runString()
|
static |
runs string example
Definition at line 427 of file string.c.
References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPcreate(), SCIPfree(), SCIPgetBestSol(), SCIPgetNSols(), SCIPincludeDefaultPlugins(), SCIPinfoMessage(), SCIPpresolve(), SCIPprintOrigProblem(), SCIPprintSol(), SCIPsolve(), and setupProblem().
Referenced by main().
◆ main()
| int main | ( | int | argc, |
| char ** | argv | ||
| ) |
main method starting SCIP
- Parameters
-
argc number of arguments from the shell argv array of shell arguments
Definition at line 468 of file string.c.
References runString(), SCIP_OKAY, and SCIPprintError().
Variable Documentation
◆ diameters
|
static |
diameters of available diameters (in)
Definition at line 52 of file string.c.
Referenced by setupProblem().
◆ preload
|
static |
◆ maxworkload
|
static |
◆ maxdeflect
|
static |
◆ deflectpreload
|
static |
◆ maxfreelen
|
static |
maximal free length of spring (in)
Definition at line 67 of file string.c.
Referenced by setupProblem().
◆ maxcoildiam
|
static |
◆ maxshearstress
|
static |
◆ shearmod
|
static |