int
DisplacementControl::newStep(void)
{
if (theDofID == -1) {
opserr << "DisplacementControl::newStep() - domainChanged has not been called\n";
return -1;
}
// get pointers to AnalysisModel and LinearSOE
AnalysisModel *theModel = this->getAnalysisModel();
LinearSOE *theLinSOE = this->getLinearSOE();
if (theModel == 0 || theLinSOE == 0) {
opserr << "WARNING DisplacementControl::newStep() ";
opserr << "No AnalysisModel or LinearSOE has been set\n";
return -1;
}
// determine increment for this iteration
double factor = specNumIncrStep/numIncrLastStep;
theIncrement *=factor;
if (theIncrement < minIncrement)
theIncrement = minIncrement;
else if (theIncrement > maxIncrement)
theIncrement = maxIncrement;
// get the current load factor
currentLambda = theModel->getCurrentDomainTime();
// determine dUhat
this->formTangent();
theLinSOE->setB(*phat);
if (theLinSOE->solve() < 0) {
opserr << "DisplacementControl::newStep(void) - failed in solver\n";
return -1;
}
(*deltaUhat) = theLinSOE->getX();
Vector &dUhat = *deltaUhat;
double dUahat = dUhat(theDofID);
if (dUahat == 0.0) {
opserr << "WARNING DisplacementControl::newStep() ";
opserr << "dUahat is zero -- zero reference displacement at control node DOF\n";
return -1;
}
// determine delta lambda(1) == dlambda
double dLambda = theIncrement/dUahat;
deltaLambdaStep = dLambda;
currentLambda += dLambda;
// opserr << "DisplacementControl: " << dUahat << " " << theDofID << endln;
// opserr << "DisplacementControl::newStep() : " << deltaLambdaStep << endln;
// determine delta U(1) == dU
(*deltaU) = dUhat;
(*deltaU) *= dLambda;
(*deltaUstep) = (*deltaU);
// update model with delta lambda and delta U
theModel->incrDisp(*deltaU);
theModel->applyLoadDomain(currentLambda);
if (theModel->updateDomain() < 0) {
opserr << "DisplacementControl::newStep - model failed to update for new dU\n";
return -1;
}
numIncrLastStep = 0;
return 0;
}
int
DisplacementPath::newStep(void)
{
if (theDofID == -1) {
opserr << "DisplacementPath::newStep() - domainChanged has not been called\n";
return -1;
}
// get pointers to AnalysisModel and LinearSOE
AnalysisModel *theModel = this->getAnalysisModel();
LinearSOE *theLinSOE = this->getLinearSOE();
if (theModel == 0 || theLinSOE == 0) {
opserr << "WARNING DisplacementPath::newStep() ";
opserr << "No AnalysisModel or LinearSOE has been set\n";
return -1;
}
// check theIncrementVector Vector
if ( theIncrementVector == 0 ) {
opserr << "DisplacementPath::newStep() - no theIncrementVector associated with object\n";
return -2;
}
// determine increment for this iteration
if (currentStep < theIncrementVector->Size()) {
theCurrentIncrement = (*theIncrementVector)(currentStep);
}
else {
theCurrentIncrement = 0.0;
opserr << "DisplacementPath::newStep() - reach the end of specified load path\n";
opserr << " - setting theCurrentIncrement = 0.0\n";
}
// get the current load factor
currentLambda = theModel->getCurrentDomainTime();
// determine dUhat and dUabar
this->formTangent();
this->formUnbalance();
(*deltaUbar) = theLinSOE->getX();
double dUabar = (*deltaUbar)(theDofID);
theLinSOE->setB(*phat);
if (theLinSOE->solve() < 0) {
opserr << "DisplacementControl::newStep(void) - failed in solver\n";
return -1;
}
(*deltaUhat) = theLinSOE->getX();
Vector &dUhat = *deltaUhat;
double dUahat = dUhat(theDofID);
//opserr << " newStep( ) " << endln;
//opserr << " theDofID = " << theDofID << endln;
//opserr << "dUahat = " << dUahat << endln;
if (dUahat == 0.0) {
opserr << "WARNING DisplacementPath::newStep() ";
opserr << "dUahat is zero -- zero reference displacement at control node DOF\n";
opserr << "currentStep = " << currentStep << endln; // add by zhong
opserr << " theCurrentIncrement = " << theCurrentIncrement << endln; // zhong
return -1;
}
// determine delta lambda(1) == dlambda
double dLambda = (theCurrentIncrement-dUabar)/dUahat;
deltaLambdaStep = dLambda;
currentLambda += dLambda;
// opserr << "DisplacementPath: " << dUahat << " " << theDofID << endln;
// opserr << "DisplacementPath::newStep() : " << deltaLambdaStep << endln;
// determine delta U(1) == dU
(*deltaU) = dUhat;
(*deltaU) *= dLambda;
(*deltaUstep) = (*deltaU);
// update model with delta lambda and delta U
theModel->incrDisp(*deltaU);
theModel->applyLoadDomain(currentLambda);
if (theModel->updateDomain() < 0) {
opserr << "DisplacementPath::newStep - model failed to update for new dU\n";
return -1;
}
currentStep++;
return 0;
}