int
IncrementalIntegrator::addModalDampingForce(void)
{
int res = 0;
if (modalDampingValues == 0)
return 0;
int numModes = modalDampingValues->Size();
const Vector &eigenvalues = theAnalysisModel->getEigenvalues();
if (eigenvalues.Size() < numModes)
numModes = eigenvalues.Size();
Vector dampingForces(theSOE->getNumEqn());
dampingForces.Zero();
for (int i=0; i<numModes; i++) {
DOF_GrpIter &theDOFs1 = theAnalysisModel->getDOFs();
DOF_Group *dofPtr;
double beta = 0.0;
double eigenvalue = eigenvalues(i); // theEigenSOE->getEigenvalue(i+1);
double wn = 0.;
if (eigenvalue > 0)
wn = sqrt(eigenvalue);
while ((dofPtr = theDOFs1()) != 0) {
beta += dofPtr->getDampingBetaFactor(i, (*modalDampingValues)(i), wn);
}
DOF_GrpIter &theDOFs2 = theAnalysisModel->getDOFs();
while ((dofPtr = theDOFs2()) != 0) {
if (theSOE->addB(dofPtr->getDampingBetaForce(i, beta),dofPtr->getID()) <0) {
opserr << "WARNING IncrementalIntegrator::failed in dofPtr";
res = -1;
}
}
}
return res;
}
int
IncrementalIntegrator::setupModal(const Vector *modalDampingValues)
{
int numModes = modalDampingValues->Size();
const Vector &eigenvalues = theAnalysisModel->getEigenvalues();
int numEigen = eigenvalues.Size();
if (numEigen < numModes)
numModes = numEigen;
int numDOF = theSOE->getNumEqn();
if (eigenValues == 0 || *eigenValues != eigenvalues) {
if (eigenValues != 0)
delete eigenValues;
if (eigenVectors != 0)
delete [] eigenVectors;
if (dampingForces != 0)
delete dampingForces;
if (mV != 0)
delete mV;
if (tmpV1 != 0)
delete tmpV1;
if (tmpV2 != 0)
delete tmpV2;
eigenValues = new Vector(eigenvalues);
dampingForces = new Vector(numDOF);
eigenVectors = new double[numDOF*numModes];
mV = new Vector(numDOF);
tmpV1 = new Vector(numDOF);
tmpV2 = new Vector(numDOF);
DOF_GrpIter &theDOFs2 = theAnalysisModel->getDOFs();
DOF_Group *dofPtr;
while ((dofPtr = theDOFs2()) != 0) {
const Matrix &dofEigenvectors =dofPtr->getEigenvectors();
const ID &dofID = dofPtr->getID();
for (int j=0; j<numModes; j++) {
for (int i=0; i<dofID.Size(); i++) {
int id = dofID(i);
if (id >= 0)
eigenVectors[j*numDOF + id] = dofEigenvectors(i,j);
}
}
}
double *eigenVectors2 = new double[numDOF*numModes];
for (int i=0; i<numModes; i++) {
double *eigenVectorI = &eigenVectors[numDOF*i];
double *mEigenVectorI = &eigenVectors2[numDOF*i];
Vector v1(eigenVectorI,numDOF);
Vector v2(mEigenVectorI,numDOF);
this->doMv(v1, v2);
}
eigenVectors = eigenVectors2;
}
return 0;
}
