linearstability.h

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/*
 *
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef linearstability_h
#define linearstability_h
 
#include "sm/EngineeringModels/structengngmodel.h"
#include "geneigvalsolvertype.h"
#include "sparsegeneigenvalsystemnm.h"
#include "sparselinsystemnm.h"
#include "sparsemtrx.h"
#include "floatmatrix.h"
#include "floatarray.h"
#include "nummet.h"


#define _IFT_LinearStability_Name "linearstability"
#define _IFT_LinearStability_nroot "nroot"
#define _IFT_LinearStability_rtolv "rtolv"
#define _IFT_LinearStability_stype "stype"
 
namespace oofem {
 
class EigenVectorPrimaryField;
//class DofDistributedPrimaryField;

class LinearStability : public StructuralEngngModel
{
private:
    std :: unique_ptr< SparseMtrx > stiffnessMatrix;
    std :: unique_ptr< SparseMtrx > initialStressMatrix;
    std :: unique_ptr< EigenVectorPrimaryField > field;
    //std :: unique_ptr< DofDistributedPrimaryField > initialDisplacements;
    FloatArray eigVal;
 
    int numberOfRequiredEigenValues;
    double rtolv;
    GenEigvalSolverType solverType;
    std :: unique_ptr< SparseGeneralEigenValueSystemNM > nMethod;
    std :: unique_ptr< SparseLinearSystemNM > nMethodLS;
 
public:
    LinearStability(int i, EngngModel *master=nullptr);
    virtual ~LinearStability() { }
 
    void solveYourself() override;
    void solveYourselfAt(TimeStep *tStep) override;
 
    void doStepOutput(TimeStep *tStep) override;
    void printOutputAt(FILE *file, TimeStep *tStep) override;
    //virtual void printOutputAt(FILE *file, TimeStep *tStep, const IntArray &nodeSets, const IntArray &elementSets);
    void terminateLinStatic(TimeStep *tStep);
    int requiresNewLsh() { return 0; }
    void updateYourself(TimeStep *tStep) override;
 
    // the intrinsic time of time step defines active eigen value and corresponding vector,
    // for which values can be requested using
    // giveUnknownComponent method.
    // When DisplacementVector is requested, then if time==0 linear elastic solution displacement are returned,
    // otherwise corresponding eigen vector is considered as displacement vector
    double giveUnknownComponent(ValueModeType type, TimeStep *tStep, Domain *d, Dof *dof) override;
    int giveUnknownDictHashIndx(ValueModeType mode, TimeStep *tStep) override;
    bool newDofHandling() override { return true; }
    void initializeFrom(InputRecord &ir) override;
    void saveContext(DataStream &stream, ContextMode mode) override;
    void restoreContext(DataStream &stream, ContextMode mode) override;
    TimeStep *giveNextStep() override;
 
    double giveEigenValue(int eigNum) override { return eigVal.at(eigNum); }
    void setActiveVector(int i) override;
 
    NumericalMethod *giveNumericalMethod(MetaStep *mStep) override;
    SparseLinearSystemNM *giveNumericalMethodForLinStaticProblem(TimeStep *tStep);
 
    // identification
    const char *giveInputRecordName() const { return _IFT_LinearStability_Name; }
    const char *giveClassName() const override { return "LinearStability"; }
    fMode giveFormulation() override { return TL; }
};
} // end namespace oofem
#endif // linearstability_h