{
  "challenge_id": "string-pluck-v1",
  "title": "Plucked damped string: pickup velocity",
  "version": 1,
  "output": {
    "type": "wav",
    "sample_rate_hz": 48000,
    "num_samples": 96000,
    "channels": 1,
    "sample_format": "float32",
    "signal": "transverse velocity at the pickup point",
    "signal_unit": "m/s",
    "signal_scale": 2.4
  },
  "parameters": {
    "L": 0.65,
    "c": 143.0,
    "sigma0": 3.0,
    "kappa": 0.004,
    "h": 0.002,
    "x_p": 0.1625,
    "w": 0.006,
    "x_m": 0.54
  },
  "metrics": {
    "primary": "waveform_l2",
    "waveform_l2": {},
    "spectrogram_l2": {
      "window": "hann_periodic",
      "n_fft": 2048,
      "hop": 512
    }
  },
  "reference_solution": null,
  "fields": {
    "format": "hdf5",
    "quantity": "transverse displacement u(x, t)",
    "units": "m",
    "axes": [
      "t",
      "x"
    ],
    "shape": [
      4001,
      201
    ],
    "frame_rate_hz": 2000,
    "dtype": "float32"
  }
}