GeneralizedAlpha.h

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/*******************************************************************************
 * Copyright (C) 2017-2024 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 GENERALIZEDALPHA_H
#define GENERALIZEDALPHA_H
 
#include "Integrator.h"
 
class GeneralizedAlpha final : public ImplicitIntegrator {
    const double alpha_f;
    const double alpha_m;
    const double gamma;
    const double beta;
 
    const double F1, F2, F3, F4, F9;
 
    double F5 = 0., F6 = 0., F7 = 0., F8 = 0., F10 = 0., F11 = 0.;
 
public:
    GeneralizedAlpha(unsigned, double);
    GeneralizedAlpha(unsigned, double, double);
 
    void assemble_resistance() override;
    void assemble_matrix() override;
 
    vec get_force_residual() override;
    vec get_displacement_residual() override;
    sp_mat get_reference_load() override;
 
    [[nodiscard]] int process_load() override;
    [[nodiscard]] int process_constraint() override;
    [[nodiscard]] int process_load_resistance() override;
    [[nodiscard]] int process_constraint_resistance() 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