AIDT 온디바이스 국방 MUM-T 6세대 전투기 표면 플라즈마 제트(PSJ) 실속 방지 서보 엔진

using System;
using System.Runtime.CompilerServices;

namespace ZeliDesk.Defense.PlasmaAerodynamics
{
    /// <summary>
    /// 주익 유동 박리 센서 배열 텔레메트리 상태
    /// </summary>
    public readonly ref struct WingSeparationTelemetryState
    {
        public readonly double AngleOfAttackDegrees;     // 현재 비행 받음각 [deg]
        public readonly double PitchRateDegPerSec;       // 피치 각속도 [deg/s]
        public readonly double AirspeedMps;              // 대기 속도 [m/s]
        public readonly double SeparationPointRatio;     // 박리 발생 위치 (0: 전연, 1: 후연)
        public readonly double PressureFluctuationRms;   // 표면 압력 요동 RMS [kPa]

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public WingSeparationTelemetryState(
            double aoa, double qRate, double speed, double sepRatio, double pressRms)
        {
            AngleOfAttackDegrees = aoa;
            PitchRateDegPerSec = qRate;
            AirspeedMps = speed;
            SeparationPointRatio = sepRatio;
            PressureFluctuationRms = pressRms;
        }
    }

    /// <summary>
    /// PSJ 액추에이터 제어 명령
    /// </summary>
    public readonly ref struct PsjActuatorCommand
    {
        public readonly double DischargeFrequencyHz;     // PSJ 방전 반복 주파수 [Hz]
        public readonly double ArcDischargeEnergyJoules; // 펄스 방전 에너지 [J]
        public readonly double LiftEnhancementRatio;     // 양력 회복 향상률
        public readonly bool SeparationSuppressed;       // 유동 박리 억제 성공 여부

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public PsjActuatorCommand(double freq, double energy, double liftRatio, bool suppressed)
        {
            DischargeFrequencyHz = freq;
            ArcDischargeEnergyJoules = energy;
            LiftEnhancementRatio = liftRatio;
            SeparationSuppressed = suppressed;
        }
    }

    /// <summary>
    /// 10,000Hz 주기 플라즈마 합성 제트 실속 방지 서보 엔진
    /// </summary>
    public ref struct PlasmaSyntheticJetStallServoEngine
    {
        private const double WingChordMeters = 3.5;       // 주익 평균 시위 [m]
        private const double OptimalFPlus = 1.1;          // 최적 무차원 주파수
        private const double CriticalAoaDeg = 24.0;       // 실속 임계 받음각 [deg]

        private double _accumulatedEnergy;
        private double _prevSepRatio;

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public PsjActuatorCommand CalculateControl(
            in WingSeparationTelemetryState state, double dtSeconds)
        {
            // 1. 최적 스트라우스 주파수 산출: f = F+ * U_inf / c
            double baseFreqHz = (OptimalFPlus * state.AirspeedMps) / WingChordMeters;

            // 2. 박리 전방 이동 감지
            double sepRate = (dtSeconds > 1e-9) ? (state.SeparationPointRatio - _prevSepRatio) / dtSeconds : 0.0;
            _prevSepRatio = state.SeparationPointRatio;

            bool separationImminent = (state.AngleOfAttackDegrees > CriticalAoaDeg) || (state.SeparationPointRatio < 0.65);

            double commandFreqHz = baseFreqHz;
            double commandEnergyJ = 0.0;

            if (separationImminent)
            {
                // 실속 방지 플라즈마 펄스 점화
                double aoaExcess = state.AngleOfAttackDegrees - CriticalAoaDeg;
                commandFreqHz += 15.0 * Math.Max(0.0, aoaExcess) + 5.0 * state.PitchRateDegPerSec;
                commandEnergyJ = 1.5 + 0.25 * Math.Max(0.0, aoaExcess);
            }
            commandFreqHz = Math.Clamp(commandFreqHz, 50.0, 1200.0);
            commandEnergyJ = Math.Clamp(commandEnergyJ, 0.0, 5.0);

            // 3. 양력 향상도 평가
            double liftRatio = separationImminent ? 1.25 : 1.00;
            bool suppressed = separationImminent && (state.SeparationPointRatio > 0.50);

            return new PsjActuatorCommand(
                commandFreqHz,
                commandEnergyJ,
                liftRatio,
                suppressed
            );
        }
    }
}