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127 lines
2.7 KiB
127 lines
2.7 KiB
/***************************************************************************
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* Copyright (C) 2005 by David Saxton *
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* david@bluehaze.org *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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***************************************************************************/
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#include "elementset.h"
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#include "inductance.h"
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#include "matrix.h"
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Inductance::Inductance( double inductance, double delta )
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: Reactive(delta)
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{
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m_inductance = inductance;
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r_eq_old = v_eq_old = 0.0;
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m_numCNodes = 2;
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m_numCBranches = 1;
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setMethod( Inductance::m_euler );
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}
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Inductance::~Inductance()
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{
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}
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void Inductance::setInductance( double i )
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{
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m_inductance = i;
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}
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void Inductance::add_initial_dc()
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{
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A_c( 0, 0 ) = 1;
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A_b( 0, 0 ) = 1;
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A_c( 0, 1 ) = -1;
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A_b( 1, 0 ) = -1;
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// The adding of r_eg and v_eq will be done for us by time_step.
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// So for now, just reset the constants used.
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r_eq_old = v_eq_old = 0.0;
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}
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void Inductance::updateCurrents()
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{
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if (!b_status)
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return;
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m_cnodeI[0] = p_cbranch[0]->i;
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m_cnodeI[1] = -m_cnodeI[0];
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}
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void Inductance::add_map()
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{
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if (!b_status)
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return;
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if ( !p_cnode[0]->isGround )
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{
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p_A->setUse_c( p_cbranch[0]->n(), p_cnode[0]->n(), Map::et_constant, true );
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p_A->setUse_b( p_cnode[0]->n(), p_cbranch[0]->n(), Map::et_constant, true );
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}
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if ( !p_cnode[1]->isGround )
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{
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p_A->setUse_c( p_cbranch[0]->n(), p_cnode[1]->n(), Map::et_constant, true );
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p_A->setUse_b( p_cnode[1]->n(), p_cbranch[0]->n(), Map::et_constant, true );
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}
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p_A->setUse_d( p_cbranch[0]->n(), p_cbranch[0]->n(), Map::et_unstable, false );
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}
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void Inductance::time_step()
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{
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if (!b_status) return;
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double i = p_cbranch[0]->i;
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double v_eq_new = 0.0, r_eq_new = 0.0;
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if ( m_method == Inductance::m_euler )
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{
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r_eq_new = m_inductance/m_delta;
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v_eq_new = -i*r_eq_new;
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}
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else if ( m_method == Inductance::m_trap ) {
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// TODO Implement + test trapezoidal method
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r_eq_new = 2.0*m_inductance/m_delta;
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}
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if ( r_eq_old != r_eq_new )
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{
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A_d( 0, 0 ) -= r_eq_new - r_eq_old;
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}
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if ( v_eq_new != v_eq_old )
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{
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b_v( 0 ) += v_eq_new - v_eq_old;
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}
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r_eq_old = r_eq_new;
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v_eq_old = v_eq_new;
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}
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bool Inductance::updateStatus()
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{
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b_status = Reactive::updateStatus();
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if ( m_method == Inductance::m_none )
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b_status = false;
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return b_status;
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}
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void Inductance::setMethod( Method m )
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{
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m_method = m;
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updateStatus();
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}
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