Newmark.h

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/*******************************************************************************
 * Copyright (C) 2017-2023 Theodore Chang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
#ifndef NEWMARK_H
#define NEWMARK_H
 
#include "Integrator.h"
 
class Newmark : public ImplicitIntegrator {
    const double beta;  
    const double gamma; 
protected:
    double C0 = 0., C1 = 0., C2 = 0., C3 = 0., C4 = 0., C5 = 0.; 
public:
    explicit Newmark(unsigned = 0, double = .25, double = .5);
 
    void assemble_resistance() override;
    void assemble_matrix() override;
 
    int update_trial_status() override;
 
    void update_parameter(double) override;
 
    vec from_incre_velocity(const vec&, const uvec&) override;
    vec from_incre_acceleration(const vec&, const uvec&) override;
 
    void print() override;
};
 
#endif