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DisplacementControl.cpp Go to the documentation of this file. /* ****************************************************************** ** ** OpenSees - Open System for Earthquake Engineering Simulation ** ** Pacific Earthquake Engineering Research Center ** ** ** ** ** ** (C) Copyright 1999, The Regents of the University of California ** ** All Rights Reserved. ** ** ** ** Commercial use of this program without express permission of the ** ** University of California, Berkeley, is strictly prohibited. See ** ** file 'COPYRIGHT' in main directory for information on usage and ** ** redistribution, and for a DISCLAIMER OF ALL WARRANTIES. ** ** ** ** Developed by: ** ** Frank McKenna (fmckenna@ce.berkeley.edu) ** ** Gregory L. Fenves (fenves@ce.berkeley.edu) ** ** Filip C. Filippou (filippou@ce.berkeley.edu) ** ** ** ** ****************************************************************** */ // $Revision: 1.4 $ // $Date: 2001/05/30 01:42:35 $ // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/DisplacementControl.cpp,v $ // File: ~/analysis/integrator/DisplacementControl.C // // Written: fmk // Created: 07/98 // Revision: A // // Description: This file contains the class definition for DisplacementControl. // DisplacementControl is an algorithmic class for perfroming a static analysis // using the arc length scheme, that is within a load step the follwing // constraint is enforced: dU^TdU + alpha^2*dLambda^2 = DisplacementControl^2 // where dU is change in nodal displacements for step, dLambda is // change in applied load and DisplacementControl is a control parameter. // // What: "@(#) DisplacementControl.C, revA" #include <DisplacementControl.h> #include <AnalysisModel.h> #include <LinearSOE.h> #include <Vector.h> #include <Channel.h> #include <iostream.h> #include <math.h> #include <Domain.h> #include <Node.h> #include <DOF_Group.h> #include <ID.h> DisplacementControl::DisplacementControl(int node, int dof, double increment, Domain *domain, int numIncr, double min, double max) :StaticIntegrator(INTEGRATOR_TAGS_DisplacementControl), theNode(node), theDof(dof), theIncrement(increment), theDomain(domain), theDofID(0), deltaUhat(0), deltaUbar(0), deltaU(0), deltaUstep(0), phat(0), deltaLambdaStep(0.0), currentLambda(0.0), specNumIncrStep(numIncr), numIncrLastStep(numIncr), minIncrement(min), maxIncrement(max) { // to avoid divide-by-zero error on first update() ensure numIncr != 0 if (numIncr == 0) { cerr << "WARNING DisplacementControl::DisplacementControl() -"; cerr << " numIncr set to 0, 1 assumed\n"; specNumIncrStep = 1.0; numIncrLastStep = 1.0; } } DisplacementControl::~DisplacementControl() { // delete any vector object created if (deltaUhat != 0) delete deltaUhat; if (deltaU != 0) delete deltaU; if (deltaUstep != 0) delete deltaUstep; if (phat != 0) delete phat; } int DisplacementControl::newStep(void) { // get pointers to AnalysisModel and LinearSOE AnalysisModel *theModel = this->getAnalysisModelPtr(); LinearSOE *theLinSOE = this->getLinearSOEPtr(); if (theModel == 0 || theLinSOE == 0) { cerr << "WARNING DisplacementControl::newStep() "; cerr << "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); theLinSOE->solve(); (*deltaUhat) = theLinSOE->getX(); Vector &dUhat = *deltaUhat; double dUahat = dUhat(theDofID); // determine delta lambda(1) == dlambda double dLambda = theIncrement/dUahat; deltaLambdaStep = dLambda; currentLambda += dLambda; // cerr << "DisplacementControl: " << dUahat << " " << theDofID << endl; // cerr << "DisplacementControl::newStep() : " << deltaLambdaStep << endl; // 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); theModel->updateDomain(); numIncrLastStep = 0; return 0; } int DisplacementControl::update(const Vector &dU) { AnalysisModel *theModel = this->getAnalysisModelPtr(); LinearSOE *theLinSOE = this->getLinearSOEPtr(); if (theModel == 0 || theLinSOE == 0) { cerr << "WARNING DisplacementControl::update() "; cerr << "No AnalysisModel or LinearSOE has been set\n"; return -1; } (*deltaUbar) = dU; // have to do this as the SOE is gonna change double dUabar = (*deltaUbar)(theDofID); // determine dUhat theLinSOE->setB(*phat); theLinSOE->solve(); (*deltaUhat) = theLinSOE->getX(); double dUahat = (*deltaUhat)(theDofID); // determine delta lambda(1) == dlambda double dLambda = -dUabar/dUahat; // determine delta U(i) (*deltaU) = (*deltaUbar); deltaU->addVector(1.0, *deltaUhat,dLambda); // update dU and dlambda (*deltaUstep) += *deltaU; deltaLambdaStep += dLambda; currentLambda += dLambda; // update the model theModel->incrDisp(*deltaU); theModel->applyLoadDomain(currentLambda); theModel->updateDomain(); // set the X soln in linearSOE to be deltaU for convergence Test for (int i=0; i<deltaU->Size(); i++) theLinSOE->setX(i, (*deltaU)(i)); numIncrLastStep++; return 0; } int DisplacementControl::domainChanged(void) { // we first create the Vectors needed AnalysisModel *theModel = this->getAnalysisModelPtr(); LinearSOE *theLinSOE = this->getLinearSOEPtr(); if (theModel == 0 || theLinSOE == 0) { cerr << "WARNING DisplacementControl::update() "; cerr << "No AnalysisModel or LinearSOE has been set\n"; return -1; } int size = theModel->getNumEqn(); // ask model in case N+1 space if (deltaUhat == 0 || deltaUhat->Size() != size) { // create new Vector if (deltaUhat != 0) delete deltaUhat; // delete the old deltaUhat = new Vector(size); if (deltaUhat == 0 || deltaUhat->Size() != size) { // check got it cerr << "FATAL DisplacementControl::domainChanged() - ran out of memory for"; cerr << " deltaUhat Vector of size " << size << endl; exit(-1); } } if (deltaUbar == 0 || deltaUbar->Size() != size) { // create new Vector if (deltaUbar != 0) delete deltaUbar; // delete the old deltaUbar = new Vector(size); if (deltaUbar == 0 || deltaUbar->Size() != size) { // check got it cerr << "FATAL DisplacementControl::domainChanged() - ran out of memory for"; cerr << " deltaUbar Vector of size " << size << endl; exit(-1); } } if (deltaU == 0 || deltaU->Size() != size) { // create new Vector if (deltaU != 0) delete deltaU; // delete the old deltaU = new Vector(size); if (deltaU == 0 || deltaU->Size() != size) { // check got it cerr << "FATAL DisplacementControl::domainChanged() - ran out of memory for"; cerr << " deltaU Vector of size " << size << endl; exit(-1); } } if (deltaUstep == 0 || deltaUstep->Size() != size) { if (deltaUstep != 0) delete deltaUstep; deltaUstep = new Vector(size); if (deltaUstep == 0 || deltaUstep->Size() != size) { cerr << "FATAL DisplacementControl::domainChanged() - ran out of memory for"; cerr << " deltaUstep Vector of size " << size << endl; exit(-1); } } if (phat == 0 || phat->Size() != size) { if (phat != 0) delete phat; phat = new Vector(size); if (phat == 0 || phat->Size() != size) { cerr << "FATAL DisplacementControl::domainChanged() - ran out of memory for"; cerr << " phat Vector of size " << size << endl; exit(-1); } } // now we have to determine phat // do this by incrementing lambda by 1, applying load // and getting phat from unbalance. currentLambda = theModel->getCurrentDomainTime(); currentLambda += 1.0; theModel->applyLoadDomain(currentLambda); this->formUnbalance(); // NOTE: this assumes unbalance at last was 0 (*phat) = theLinSOE->getB(); currentLambda -= 1.0; theModel->setCurrentDomainTime(currentLambda); // check there is a reference load int haveLoad = 0; for (int i=0; i<size; i++) if ( (*phat)(i) != 0.0 ) { haveLoad = 1; i = size; } if (haveLoad == 0) { cerr << "WARNING DisplacementControl::domainChanged() - zero reference load"; return -1; } // lastly we determine the id of the nodal dof // EXTRA CODE TO DO SOME ERROR CHECKING REQUIRED Node *theNodePtr = theDomain->getNode(theNode); DOF_Group *theGroup = theNodePtr->getDOF_GroupPtr(); const ID &theID = theGroup->getID(); theDofID = theID(theDof); return 0; } int DisplacementControl::sendSelf(int cTag, Channel &theChannel) { // TO FINISH return 0; } int DisplacementControl::recvSelf(int cTag, Channel &theChannel, FEM_ObjectBroker &theBroker) { // TO FINISH return 0; } void DisplacementControl::Print(ostream &s, int flag) { // TO FINISH }

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