KOKO\Mimi
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
#ifndef FESA_ANALYSIS_HHT_TIME_INTEGRATION_H_
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#define FESA_ANALYSIS_HHT_TIME_INTEGRATION_H_
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#include "fesa/core/status.h"
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#include "fesa/math/vector.h"
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namespace fesa {
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/// @brief Stores the coupled original negative-alpha HHT coefficients.
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struct HhtParameters {
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double alpha;
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double beta;
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double gamma;
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};
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/// @brief Stores the displacement and velocity Newmark predictors.
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struct HhtPredictor {
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Vector coordinates;
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Vector velocity;
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};
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/// @brief Separates physical chart rates from the auxiliary acceleration.
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struct HhtRates {
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Vector velocity;
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Vector acceleration;
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Vector algorithmic_acceleration;
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};
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/// @brief Builds coupled coefficients for alpha in [-1/3, 0].
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/// @note The public INP subset uses only alpha=-0.05.
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Result<HhtParameters> MakeHhtParameters(double alpha);
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/// @brief Predicts q and v using the old auxiliary acceleration.
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/// @param time_increment Finite positive duration in input time units.
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Result<HhtPredictor> PredictHht(const Vector& coordinates,
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const Vector& velocity,
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const Vector& algorithmic_acceleration,
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double time_increment,
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const HhtParameters& parameters);
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/// @brief Recovers physical and auxiliary rates from one trial coordinate.
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/// @param old_acceleration Physical endpoint acceleration at the old time.
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Result<HhtRates> EvaluateHhtRates(const Vector& coordinates,
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const HhtPredictor& predictor,
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const Vector& old_acceleration,
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double time_increment,
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const HhtParameters& parameters);
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} // namespace fesa
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#endif // FESA_ANALYSIS_HHT_TIME_INTEGRATION_H_
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