{
  "_meta": {
    "title": "NDCI fault × sensor diagnostic-contribution matrix",
    "source": "Suslu, B. (2025). Sensor Optimisation for Aircraft Health Management Systems. PhD thesis, Cranfield University. Faults from Table 4-1, pp.162-163. Sensor list and qualitative rankings from Sections 3.4 (ECS, Fig 3-4) and 4.4-4.6 (Engine, Fuel, EPS — Figs 4-9 to 4-12).",
    "related_papers": [
      "Suslu, Ali, Jennions (2025). NDCI Integration to MOSOF — An ECS Case. Sensors 25(9), 2661. doi:10.3390/s25092661"
    ],
    "what_is_real": "Fault list and sensor list (names, subsystem, family). Per-sensor 'headline strength' encodes the published qualitative rankings: 'NDCI elevates W_AfBleed and h_S4 in Engine'; 'AC_Fluoro_V and AC_Instru_V have high Uniqueness in EPS'; 'ThiSHX and ToT exhibit notable deviations across multiple fault modes'; 'TciCHX remains largely static'.",
    "what_is_synthesised": "Per-cell NDCI values. The thesis figures (Fig 3-4, 4-9..4-12) render NDCI as bar heights in bitmaps; the underlying CSV is in the linked GitHub repo, not in the PDF text layer. Cells are generated by the formula: cell = affinity[sensor_subsys × fault_subsys] × headline_strength[sensor] × noise[±20%]. Same-subsystem affinity is 0.55; cross-subsystem 0.04-0.18.",
    "n_faults": 12,
    "n_sensors": 18,
    "knee_composition": {
      "Engine": 5,
      "Fuel": 2,
      "EPS": 2,
      "ECS": 3
    }
  },
  "faults": [
    {
      "id": "FM14",
      "label": "LPT blade broken",
      "subsystem": "Engine"
    },
    {
      "id": "FM15",
      "label": "LPC fouling",
      "subsystem": "Engine"
    },
    {
      "id": "FM18",
      "label": "Fan FOD",
      "subsystem": "Engine"
    },
    {
      "id": "FM8",
      "label": "Pump external leakage",
      "subsystem": "Fuel"
    },
    {
      "id": "FM10",
      "label": "FOHE clogging",
      "subsystem": "Fuel"
    },
    {
      "id": "FM12",
      "label": "Fuel nozzle clogging",
      "subsystem": "Fuel"
    },
    {
      "id": "FM1",
      "label": "AC motor fault",
      "subsystem": "EPS"
    },
    {
      "id": "FM4",
      "label": "Engine bleed valve sw. open",
      "subsystem": "EPS"
    },
    {
      "id": "FM6",
      "label": "AC lamp instr. sw. open",
      "subsystem": "EPS"
    },
    {
      "id": "FM21",
      "label": "PHX fouling",
      "subsystem": "ECS"
    },
    {
      "id": "FM23",
      "label": "SHX fouling",
      "subsystem": "ECS"
    },
    {
      "id": "FM24",
      "label": "ACM mech. efficiency loss",
      "subsystem": "ECS"
    }
  ],
  "sensors": [
    {
      "id": "EGT",
      "label": "EGT",
      "subsystem": "Engine",
      "family": "Temperature"
    },
    {
      "id": "N1",
      "label": "N1",
      "subsystem": "Engine",
      "family": "Speed"
    },
    {
      "id": "N2",
      "label": "N2",
      "subsystem": "Engine",
      "family": "Speed"
    },
    {
      "id": "W_AfBleed",
      "label": "W aft bleed",
      "subsystem": "Engine",
      "family": "Flow"
    },
    {
      "id": "h_S4",
      "label": "h station-4",
      "subsystem": "Engine",
      "family": "Thermo"
    },
    {
      "id": "P_Comp",
      "label": "P compressor",
      "subsystem": "Engine",
      "family": "Pressure"
    },
    {
      "id": "T_Burner",
      "label": "T burner in",
      "subsystem": "Engine",
      "family": "Temperature"
    },
    {
      "id": "FuelFlow",
      "label": "Total flow",
      "subsystem": "Fuel",
      "family": "Flow"
    },
    {
      "id": "P_Manifold",
      "label": "P manifold",
      "subsystem": "Fuel",
      "family": "Pressure"
    },
    {
      "id": "T_FuelOut",
      "label": "T fuel out",
      "subsystem": "Fuel",
      "family": "Temperature"
    },
    {
      "id": "AC_Fluoro_V",
      "label": "Fluoro bus V",
      "subsystem": "EPS",
      "family": "Voltage"
    },
    {
      "id": "AC_Instru_V",
      "label": "Instr bus V",
      "subsystem": "EPS",
      "family": "Voltage"
    },
    {
      "id": "DC_Bus_I",
      "label": "DC bus I",
      "subsystem": "EPS",
      "family": "Current"
    },
    {
      "id": "ThiSHX",
      "label": "T_hi SHX",
      "subsystem": "ECS",
      "family": "Temperature"
    },
    {
      "id": "ToT",
      "label": "T out turb",
      "subsystem": "ECS",
      "family": "Temperature"
    },
    {
      "id": "P_O",
      "label": "P pack out",
      "subsystem": "ECS",
      "family": "Pressure"
    },
    {
      "id": "TciCHX",
      "label": "T_ci CHX",
      "subsystem": "ECS",
      "family": "Temperature"
    },
    {
      "id": "TcoSHX",
      "label": "T_co SHX",
      "subsystem": "ECS",
      "family": "Temperature"
    }
  ],
  "ndci": [
    [
      0.488,
      0.474,
      0.4,
      0.465,
      0.415,
      0.432,
      0.317,
      0.137,
      0.138,
      0.068,
      0.062,
      0.064,
      0.028,
      0.064,
      0.06,
      0.061,
      0.032,
      0.045
    ],
    [
      0.419,
      0.485,
      0.48,
      0.625,
      0.544,
      0.425,
      0.291,
      0.192,
      0.149,
      0.084,
      0.05,
      0.048,
      0.027,
      0.086,
      0.075,
      0.058,
      0.034,
      0.05
    ],
    [
      0.435,
      0.504,
      0.416,
      0.6,
      0.481,
      0.357,
      0.345,
      0.162,
      0.154,
      0.091,
      0.058,
      0.057,
      0.035,
      0.085,
      0.084,
      0.069,
      0.027,
      0.051
    ],
    [
      0.162,
      0.127,
      0.121,
      0.163,
      0.16,
      0.122,
      0.108,
      0.46,
      0.399,
      0.266,
      0.032,
      0.034,
      0.024,
      0.061,
      0.062,
      0.047,
      0.022,
      0.038
    ],
    [
      0.149,
      0.138,
      0.119,
      0.18,
      0.169,
      0.123,
      0.108,
      0.447,
      0.387,
      0.217,
      0.037,
      0.037,
      0.025,
      0.053,
      0.045,
      0.047,
      0.02,
      0.033
    ],
    [
      0.136,
      0.157,
      0.144,
      0.158,
      0.196,
      0.102,
      0.106,
      0.553,
      0.378,
      0.297,
      0.034,
      0.039,
      0.025,
      0.049,
      0.055,
      0.041,
      0.021,
      0.042
    ],
    [
      0.058,
      0.052,
      0.046,
      0.052,
      0.065,
      0.037,
      0.036,
      0.037,
      0.03,
      0.02,
      0.468,
      0.41,
      0.361,
      0.045,
      0.046,
      0.04,
      0.02,
      0.031
    ],
    [
      0.049,
      0.054,
      0.052,
      0.069,
      0.065,
      0.034,
      0.038,
      0.034,
      0.035,
      0.02,
      0.452,
      0.496,
      0.257,
      0.042,
      0.043,
      0.043,
      0.02,
      0.036
    ],
    [
      0.061,
      0.042,
      0.047,
      0.06,
      0.053,
      0.037,
      0.036,
      0.038,
      0.028,
      0.02,
      0.496,
      0.51,
      0.335,
      0.044,
      0.042,
      0.036,
      0.021,
      0.031
    ],
    [
      0.08,
      0.078,
      0.048,
      0.063,
      0.076,
      0.06,
      0.049,
      0.054,
      0.041,
      0.032,
      0.049,
      0.051,
      0.032,
      0.512,
      0.475,
      0.346,
      0.165,
      0.395
    ],
    [
      0.064,
      0.073,
      0.068,
      0.091,
      0.073,
      0.054,
      0.052,
      0.05,
      0.045,
      0.026,
      0.052,
      0.037,
      0.032,
      0.542,
      0.497,
      0.389,
      0.184,
      0.315
    ],
    [
      0.074,
      0.053,
      0.062,
      0.072,
      0.079,
      0.044,
      0.048,
      0.065,
      0.044,
      0.029,
      0.038,
      0.051,
      0.027,
      0.636,
      0.471,
      0.397,
      0.168,
      0.298
    ]
  ]
}