{
  "mass_kg": 120.0,
  "pitch_inertia_kg_m2": 18.0,
  "support_positions_m": [
    -0.42,
    0.36
  ],
  "force_position_m": 0.22,
  "sensor_position_m": 0.25,
  "stiffness_split": [
    1.05,
    0.95
  ],
  "unbalance_kg_m": 0.002,
  "operating_frequency_hz": [
    20.0,
    35.0
  ],
  "candidate_pair_stiffness_N_m": [
    80000,
    100000,
    120000,
    140000,
    180000,
    240000
  ],
  "candidate_damping_ratios": [
    0.06,
    0.1,
    0.14,
    0.2,
    0.28
  ],
  "uncertainty": {
    "mass_factors": [
      0.9,
      1.1
    ],
    "cg_shift_m": [
      -0.04,
      0.04
    ],
    "stiffness_factors": [
      0.9,
      1.1
    ],
    "damping_factors": [
      0.8,
      1.2
    ]
  },
  "limits": {
    "static_compression_mm": 8.5,
    "operating_reaction_envelope_N": 18.0,
    "operating_sensor_acceleration_m_s2": 1.8,
    "decay_2percent_s": 2.0,
    "transient_relative_motion_mm": 2.0,
    "total_compression_mm": 11.0,
    "group_load_min_N": 0.0,
    "group_load_max_N": 1100.0
  },
  "runup": {
    "maximum_hz": 30.0,
    "ramp_s": 2.0,
    "hold_s": 1.0,
    "settle_s": 2.0
  },
  "bump": {
    "amplitude_m": 0.001,
    "duration_s": 0.15,
    "record_s": 3.0
  },
  "notes": "Synthetic reference skid. Two support groups represent a left/right pair of mounts each. These are assumed equivalent linear properties, not measured vendor mount data."
}