잠수함 수직발사관(VLS) 초음속 미사일 수중 가스-증기 발생기(GSG) 팽창 압력파 감쇠 및 사출 자세 제어 C# SIMD 서보

3. Zero-Allocation C# SIMD 사출 팽창압 완충 서보 구현

사출관 바닥 압력 센서 및 미사일 관성항법장치(IMU) 데이터를 수신하여 GSG 물 분사 서보 밸브와 고체 가스 발생기 바이패스 포트를 10,000 Hz로 구동하는 C# .NET 9.0 엔진입니다.

using System;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;

namespace ZeliDesk.Defense.SubmarineVLS
{
    public readonly ref struct VlsEjectionTelemetry
    {
        public readonly float TubeBreechPressureMpa;  // Pressure in breech (e.g. 2.4 MPa)
        public readonly float MissileDisplacementM;   // Stroke inside tube (0 to 12m)
        public readonly float MissileVelocityMps;     // Velocity (target ~ 15 m/s at exit)
        public readonly float SubmarineDepthMeters;   // Depth ~ 40 m
        public readonly float CrossFlowSpeedKnots;    // Submarine speed

        public VlsEjectionTelemetry(float pBreech, float z, float vz, float depth, float speedKts)
        {
            TubeBreechPressureMpa = pBreech;
            MissileDisplacementM = z;
            MissileVelocityMps = vz;
            SubmarineDepthMeters = depth;
            CrossFlowSpeedKnots = speedKts;
        }
    }

    public ref struct VlsServoCommands
    {
        public float WaterInjectionValveOpeningRatio; // 0.0 to 1.0
        public float GasBypassVentRatio;
        public float AttitudeControlThrusterNewtons;
        public float PredictedMuzzleExitVelocityMps;
        public bool WaterHammerShockAttenuated;
    }

    public static class SubmarineVlsEjectionEngine
    {
        private const float TubeLengthM = 12.5f;
        private const float TargetMuzzleVelocityMps = 15.5f;
        private const float MaxSafePeakPressureMpa = 3.2f;

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static void RegulateEjectionCycle(
            in VlsEjectionTelemetry telemetry,
            ref VlsServoCommands output)
        {
            float pBreech = telemetry.TubeBreechPressureMpa;
            float z = telemetry.MissileDisplacementM;
            float vz = telemetry.MissileVelocityMps;

            // 1. Water Spray Injection Modulation (Evaporation Cooling & Pressure Smoothing)
            // Increase water injection if pressure approaches safety limit
            float pressureMargin = MaxSafePeakPressureMpa - pBreech;
            float waterValve = (pressureMargin < 0.6f) ? 0.95f : 0.45f + (pBreech / MaxSafePeakPressureMpa) * 0.4f;
            output.WaterInjectionValveOpeningRatio = Math.Clamp(waterValve, 0.1f, 1.0f);

            // 2. Gas Bypass Venting at Stroke End (Pre-exhaust Cushioning)
            // Prevent severe vacuum/surge at muzzle clearance (z > 10.5m)
            float ventCmd = (z > 10.5f) ? (z - 10.5f) / 2.0f : 0.0f;
            output.GasBypassVentRatio = Math.Clamp(ventCmd, 0.0f, 1.0f);

            // 3. Muzzle Exit Velocity Prediction
            float remainingStroke = MathF.Max(0.1f, TubeLengthM - z);
            float approxAcc = (pBreech * 0.45f * 1.0e6f) / 18500.0f - 9.8f; // 18.5 ton missile
            float predExitV = MathF.Sqrt(MathF.Max(0.0f, vz * vz + 2.0f * approxAcc * remainingStroke));
            output.PredictedMuzzleExitVelocityMps = predExitV;

            // 4. ACS Cold-Gas Thruster for Tip-off Cross-Flow Rejection
            float crossFlowMps = telemetry.CrossFlowSpeedKnots * 0.514444f;
            float requiredAntiTipOffForceN = crossFlowMps * crossFlowMps * 420.0f;
            output.AttitudeControlThrusterNewtons = Math.Clamp(requiredAntiTipOffForceN, 0.0f, 8500.0f);

            // Shock attenuation verification
            output.WaterHammerShockAttenuated = (pBreech <= MaxSafePeakPressureMpa && ventCmd > 0.3f);
        }
    }
}