SCIP
Solving Constraint Integer Programs
Detailed Description
Coil Compression Spring 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 spring as it can be found in the GAMS model library: https://www.gams.com/latest/gamslib_ml/libhtml/gamslib_spring.html
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 spring.c.
Go to the source code of this file.
Macros | |
| #define | nwires 11 |
Functions | |
| static SCIP_RETCODE | setupProblem (SCIP *scip) |
| static SCIP_RETCODE | runSpring (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
◆ nwires
| #define nwires 11 |
Function Documentation
◆ setupProblem()
|
static |
sets up problem
- Parameters
-
scip SCIP data structure
Definition at line 93 of file spring.c.
References deflectpreload, diameters, FALSE, M_PI, maxcoildiam, maxdeflect, maxfreelen, maxshearstress, maxworkload, NULL, nwires, preload, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_BINARY, SCIP_VARTYPE_CONTINUOUS, SCIP_VARTYPE_INTEGER, SCIPaddCoefLinear(), SCIPaddCons(), SCIPaddVar(), SCIPchgVarLb(), SCIPchgVarUb(), SCIPcreateConsBasicLinear(), SCIPcreateConsBasicNonlinear(), SCIPcreateConsBasicSetpart(), SCIPcreateConsQuadraticNonlinear(), SCIPcreateExprPow(), SCIPcreateExprProduct(), SCIPcreateExprSum(), SCIPcreateExprVar(), SCIPcreateProbBasic(), SCIPcreateVarBasic(), SCIPinfinity(), SCIPreleaseCons(), SCIPreleaseExpr(), SCIPreleaseVar(), SCIPsnprintf(), shearmod, TRUE, and y.
Referenced by runSpring().
◆ runSpring()
|
static |
runs spring example
Definition at line 426 of file spring.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 467 of file spring.c.
References runSpring(), SCIP_OKAY, and SCIPprintError().
Variable Documentation
◆ diameters
|
static |
diameters of available diameters (in)
Definition at line 64 of file spring.c.
Referenced by setupProblem().
◆ preload
|
static |
◆ maxworkload
|
static |
◆ maxdeflect
|
static |
◆ deflectpreload
|
static |
◆ maxfreelen
|
static |
maximal free length of spring (in)
Definition at line 79 of file spring.c.
Referenced by setupProblem().
◆ maxcoildiam
|
static |
◆ maxshearstress
|
static |
◆ shearmod
|
static |