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118 lines
2.8 KiB
118 lines
2.8 KiB
/***************************************************************************
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* Copyright (C) 2003-2005 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 "capacitance.h"
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#include "matrix.h"
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Capacitance::Capacitance( const double capacitance, const double delta )
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: Reactive(delta)
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{
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m_cap = capacitance;
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g_eq_old = i_eq_old = 0.;
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m_numCNodes = 2;
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setMethod( Capacitance::m_euler );
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}
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Capacitance::~Capacitance()
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{
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}
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void Capacitance::setCapacitance( const double c )
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{
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m_cap = c;
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}
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void Capacitance::add_initial_dc()
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{
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// We don't need to do anything here, as time_step() will do that for us,
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// apart from to make sure our old values are 0
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g_eq_old = i_eq_old = 0.;
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}
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void Capacitance::updateCurrents()
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{
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if (!b_status) return;
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const double r_i = (p_cnode[0]->v-p_cnode[1]->v)*g_eq_old;
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m_cnodeI[0] = -i_eq_old-r_i;
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m_cnodeI[1] = -m_cnodeI[0];
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}
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void Capacitance::add_map()
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{
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if (!b_status) return;
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if ( !p_cnode[0]->isGround )
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{
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p_A->setUse( p_cnode[0]->n(), p_cnode[0]->n(), Map::et_unstable, false );
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}
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if ( !p_cnode[1]->isGround )
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{
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p_A->setUse( p_cnode[1]->n(), p_cnode[1]->n(), Map::et_unstable, false );
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}
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if ( !p_cnode[0]->isGround && !p_cnode[1]->isGround )
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{
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p_A->setUse( p_cnode[0]->n(), p_cnode[1]->n(), Map::et_unstable, false );
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p_A->setUse( p_cnode[1]->n(), p_cnode[0]->n(), Map::et_unstable, false );
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}
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}
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void Capacitance::time_step()
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{
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if (!b_status) return;
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double v = p_cnode[0]->v-p_cnode[1]->v;
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double i_eq_new = 0.0, g_eq_new = 0.0;
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if ( m_method == Capacitance::m_euler )
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{
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g_eq_new = m_cap/m_delta;
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i_eq_new = -v*g_eq_new;
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}
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else if ( m_method == Capacitance::m_trap ) {
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// TODO Implement + test trapezoidal method
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g_eq_new = 2.*m_cap/m_delta;
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}
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if ( g_eq_old != g_eq_new )
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{
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A_g( 0, 0 ) += g_eq_new-g_eq_old;
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A_g( 1, 1 ) += g_eq_new-g_eq_old;
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A_g( 0, 1 ) -= g_eq_new-g_eq_old;
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A_g( 1, 0 ) -= g_eq_new-g_eq_old;
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}
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if ( i_eq_new != i_eq_old )
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{
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b_i( 0 ) -= i_eq_new-i_eq_old;
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b_i( 1 ) += i_eq_new-i_eq_old;
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}
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g_eq_old = g_eq_new;
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i_eq_old = i_eq_new;
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}
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bool Capacitance::updateStatus()
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{
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b_status = Reactive::updateStatus();
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if ( m_method == Capacitance::m_none ) b_status = false;
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return b_status;
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}
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void Capacitance::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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