Method update

SRC/analysis/integrator/AlphaOS_TP.cpp:453–502

int AlphaOS_TP::update(const Vector &deltaU)
{
    updateCount++;
    if (updateCount > 1)  {
        opserr << "WARNING AlphaOS_TP::update() - called more than once -";
        opserr << " AlphaOS_TP integration scheme requires a LINEAR solution algorithm\n";
        return -1;
    }
    
    AnalysisModel *theModel = this->getAnalysisModel();
    if (theModel == 0)  {
        opserr << "WARNING AlphaOS_TP::update() - no AnalysisModel set\n";
        return -2;
    }
    
    // check domainChanged() has been called, i.e. Ut will not be zero
    if (Ut == 0)  {
        opserr << "WARNING AlphaOS_TP::update() - domainChange() failed or not called\n";
        return -3;
    }
    
    // check deltaU is of correct size
    if (deltaU.Size() != U->Size())  {
        opserr << "WARNING AlphaOS_TP::update() - Vectors of incompatible size ";
        opserr << " expecting " << U->Size() << " obtained " << deltaU.Size() << "\n";
        return -4;
    }
    
    // save the predictor displacements
    (*Upt) = *U;
    
    //  determine the response at t+deltaT
    U->addVector(1.0, deltaU, c1);
    
    Udot->addVector(1.0, deltaU, c2);
    
    Udotdot->addVector(0.0, deltaU, c3);
    
    // update the response at the DOFs
    theModel->setVel(*Udot);
    theModel->setAccel(*Udotdot);
    if (theModel->updateDomain() < 0)  {
        opserr << "AlphaOS_TP::update() - failed to update the domain\n";
        return -5;
    }
    // do not update displacements in elements only at nodes
    theModel->setDisp(*U);
    
    return 0;
}


int AlphaOS_TP::commit(void)