public stressConstraint(ForceVelocityPositionAnalysis fvpAnalysis, double Nf, double SFB, double SFC)
{
FVPAnalysis = fvpAnalysis;
this.Nf = Nf;
this.SFB = SFB;
this.SFC = SFC;
}
public boundingboxConstraint(ForceVelocityPositionAnalysis fvpAnalysis, double minX, double maxX,
double minY, double maxY, double minZ, double maxZ)
{
FVPAnalysis = fvpAnalysis;
this.minX = minX;
this.maxX = maxX;
this.minY = minY;
this.maxY = maxY;
this.minZ = minZ;
this.maxZ = maxZ;
}
public outputLocationConstraint(ForceVelocityPositionAnalysis fvpAnalysis, double tolerance,
double xtarget, double ytarget, double ztarget)
// double thetaX, double thetaY, double thetaZ)
{
FVPAnalysis = fvpAnalysis;
this.tolerance = tolerance;
this.xtarget = xtarget;
this.ytarget = ytarget;
this.ztarget = ztarget;
//this.thetaX = thetaX;
//this.thetaY = thetaY;
//this.thetaZ = thetaZ;
}
public massObjective(ForceVelocityPositionAnalysis fvpsAnalysis, double gearDensity)
{
FVPAnalysis = fvpsAnalysis;
numberGears = fvpsAnalysis.numGears;
this.gearDensity = gearDensity;
}
public outputSpeedConstraint(ForceVelocityPositionAnalysis fvpAnalysis, double targetSpeed, double tolerance)
{
FVPAnalysis = fvpAnalysis;
this.targetSpeed = targetSpeed;
this.tolerance = tolerance;
}
// This is the set of valid AGMA gear pitches (in unit of inch^-1).
private static void Main()
{
//var opty = new GradientBasedOptimization();
//var opty = new HillClimbing();
var opty = new GeneticAlgorithm(100);
var numGears = 2 * NumGearPairs;
/* here is the Dependent Analysis. Take a look at the file/class ForceVelocityPositionAnalysis.cs
* and notice that it inherits from IDependent Analysis. By adding this to the optimization method
* (line 122), we are ensuring that it is called for any new decision variables found in the process.*/
var FVPAnalysis = new ForceVelocityPositionAnalysis(numGears, outputTorque, inputSpeed, inputPosition);
opty.Add(FVPAnalysis);
/* here is the objective function, minimize mass. Note that it will hold a reference to the
* ForceVelocityPositionAnalysis so that it can reference it for exact values of diamter. */
opty.Add(new massObjective(FVPAnalysis, gearDensity));
/* here is an inequality constraint for fitting within the box described above. Again, it
* needs to position and diameter information stored in ForceVelocityPositionAnalysis */
opty.Add(new boundingboxConstraint(FVPAnalysis, boxMinX, boxMaxX, boxMinY, boxMaxY, boxMinZ,
boxMaxZ));
/* on and on: stress inequality, output Location, output Speed equalities. Details can be found in
* http://dx.doi.org/10.1115/DETC2009-86780 */
opty.Add(new stressConstraint(FVPAnalysis, Nf, SFB, SFC));
opty.Add(new outputLocationConstraint(FVPAnalysis, locationTol, outputX, outputY, outputZ));
opty.Add(new outputSpeedConstraint(FVPAnalysis, speedTol, outputSpeed));
for (var i = 0; i < NumGearPairs - 1; i++)
{
// each mating gear pair must have the same pitch.
opty.Add(new samePitch(i * 4 + 1, (i + 1) * 4 + 1));
}
/******** Set up Design Space *************/
/* for the GA and the Hill Climbing, a compete discrete space is needed. Face width and
* location parameters should be continuous though. Consider removing the 800's below
* when using a mixed optimization method. */
var dsd = new DesignSpaceDescription(numGears * 4);
for (var i = 0; i < numGears; i++)
{
dsd[4 * i] = new VariableDescriptor(5, 1000, 1.0); // number of teeth: integers between 5 and 1000
dsd[4 * i + 1] = new VariableDescriptor(ValidPitches); // pitches from AGMA standard
dsd[4 * i + 2] = new VariableDescriptor(0, 50, 800); // face width is between 0 and 50 inches
dsd[4 * i + 3] = new VariableDescriptor(0, 500, 800); //location is either an angle or a length
// a max of 500 inches is generous
}
opty.Add(dsd);
/******** Set up Optimization *************/
/* the following mish-mash is similiar to previous project - just trying to find a
* combination of methods that'll lead to the optimial optimization algorithm. */
//abstractSearchDirection searchDirMethod = new SteepestDescent();
//opty.Add(searchDirMethod);
//abstractLineSearch lineSearchMethod = new ArithmeticMean(0.0001, 1, 100);
//opty.Add(lineSearchMethod);
opty.Add(new LatinHyperCube(dsd, VariablesInScope.BothDiscreteAndReal));
opty.Add(new GACrossoverBitString(dsd));
opty.Add(new GAMutationBitString(dsd));
opty.Add(new PNormProportionalSelection(optimize.minimize, true, 0.7));
//opty.Add(new RandomNeighborGenerator(dsd,3000));
//opty.Add(new KeepSingleBest(optimize.minimize));
opty.Add(new squaredExteriorPenalty(opty, 10));
opty.Add(new MaxAgeConvergence(40, 0.001));
opty.Add(new MaxFnEvalsConvergence(10000));
opty.Add(new MaxSpanInPopulationConvergence(15));
double[] xStar;
Parameters.Verbosity = VerbosityLevels.AboveNormal;
// this next line is to set the Debug statements from OOOT to the Console.
Debug.Listeners.Add(new TextWriterTraceListener(Console.Out));
var timer = Stopwatch.StartNew();
var fStar = opty.Run(out xStar, numGears * 4);
printResults(opty, xStar, fStar, timer);
Console.ReadKey();
}
