Capacitor.hpp

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#ifndef _CAPACITOR_HPP_INC_
#define _CAPACITOR_HPP_INC_
#include "CircuitElements/Component.hpp"
#include "Maths/DynamicMatrix.hpp"
 
 
template<typename T>
struct Capacitor : public Component<T> {
 public:
    T value = 0;
 
    size_t n1 = 0;
    size_t n2 = 0;
    T lastCurrent = 0;
 
    bool trapezoidalRule = true;
    void addDynamicStampTo(Stamp<T> & stamp, const Matrix<T> & solutionMatrix,
                           const size_t currentSolutionIndex, T timestep) const {
        size_t n1p = n1 - 1;
        size_t n2p = n2 - 1;
 
        T u0 = 0;
        if (n1) {
            u0 = solutionMatrix(n1p, currentSolutionIndex - 1);
        }
 
        if (n2) {
            u0 -= solutionMatrix(n2p, currentSolutionIndex - 1);
        }
 
 
        T G_eq = 0;
        T I_eq = 0;
 
        if (trapezoidalRule) {
            G_eq = 2 * value / timestep;
            I_eq = lastCurrent + G_eq * u0;
        } else {
            G_eq = value / timestep;
            I_eq = value * u0 / timestep;
        }
 
        if (n1) {
            stamp.G(n1p, n1p) += G_eq;
            stamp.s(n1p, 0) += I_eq;
        }
 
        if (n2) {
            stamp.G(n2p, n2p) += G_eq;
            stamp.s(n2p, 0) += -I_eq;
        }
 
        if (n1 && n2) {
            stamp.G(n1p, n2p) += -G_eq;
            stamp.G(n2p, n1p) += -G_eq;
        }
    }
 
    void updateStoredState(const Matrix<T> & solutionMatrix,
                           const size_t currentSolutionIndex, T timestep,
                           size_t sizeG_A) {
        if (trapezoidalRule) {
            size_t n1p = n1 - 1;
            size_t n2p = n2 - 1;
            T u0 = 0;
            T u1 = 0;
            if (n1) {
                u0 = solutionMatrix(n1p, currentSolutionIndex - 1);
                u1 = solutionMatrix(n1p, currentSolutionIndex);
            }
 
            if (n2) {
                u0 -= solutionMatrix(n2p, currentSolutionIndex - 1);
                u1 -= solutionMatrix(n2p, currentSolutionIndex);
            }
 
            T G_eq = 2 * value / timestep;
            lastCurrent = G_eq * u1 - (lastCurrent + G_eq * u0);
        }
    }
 
    void addDCAnalysisStampTo(Stamp<T> & stamp, const Matrix<T> & solutionVector,
                              size_t numCurrents) const {
        // open circuit. Maybe add large connection to ref if unstable
        if (n1 > 0) {
            stamp.G(n1 - 1, n1 - 1) += 1e-9;
        }
        if (n2 > 0) {
            stamp.G(n2 - 1, n2 - 1) += 1e-9;
        }
    }
 
    static void
    addToElements(const std::string & line, CircuitElements<T> & elements,
                  size_t & numNodes, size_t & numCurrents, size_t & numDCCurrents) {
        // std::regex capacitorRegex( R"(^C(.*?)\s(\d+?)\s(\d+?)\s(.+?)\s?$)" );
        std::regex capacitorRegex = generateRegex("C", "n n w");
        Capacitor<T> capacitor;
        std::smatch matches;
 
        std::regex_match(line, matches, capacitorRegex);
 
        capacitor.designator = "C";
        capacitor.designator += matches.str(1);
 
        capacitor.n1 = std::stoi(matches.str(2));
        capacitor.n2 = std::stoi(matches.str(3));
        capacitor.trapezoidalRule = true;
 
        numNodes = std::max(numNodes, std::stoull(matches.str(2)));
        numNodes = std::max(numNodes, std::stoull(matches.str(3)));
 
        if constexpr (std::is_same_v<T, double> || std::is_same_v<T, float>) {
            capacitor.value = std::stod(matches.str(4));
        } else {
            static_assert("Unsupported Type");
        }
 
        elements.dynamicElements.emplace_back(
            std::make_shared<Capacitor<T> >(capacitor));
 
        elements.nodeComponentMap.insert(
            {{capacitor.n1, elements.dynamicElements.back()},
             {capacitor.n2, elements.dynamicElements.back()}});
    }
};
 
 
#endif