{
  "challenge_id": "cymbal-tapered-v1",
  "title": "Bowed, belled and hammered bronze disk lathed to a tapered thickness, struck with a drum stick, geometrically nonlinear: radiated pressure",
  "version": 1,
  "output": {
    "type": "wav",
    "sample_rate_hz": 48000,
    "num_samples": 288000,
    "channels": 1,
    "sample_format": "float32",
    "signal": "acoustic pressure at the listener point from the Rayleigh-type integral over the top face of the normal acceleration, with the rigid motion linearized",
    "signal_unit": "Pa",
    "signal_scale": 160.0
  },
  "playback": {
    "gain_db": 30,
    "note": "Formerly a suggested playback gain; the results sites now loudness-normalize playback and this field is unused."
  },
  "geometry": {
    "type": "shell-of-revolution",
    "mid_surface": "z = Z(r) + sum over dents of -depth/2 * (1 + cos(pi rho / radius)) * [rho < radius], with Z(r) the bow-plus-bell profile of cymbal-bell-v1 and rho the distance to the dent center",
    "thickness": "h(r) = thickness_center for r <= bell_radius, and linear from thickness_center at r = bell_radius to thickness_rim at r = disk_radius; measured along the normal to the mid-surface",
    "hole": "circular, radius hole_radius, centered on the axis, free edge",
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    "listener_y": 0.08,
    "listener_z": 0.5
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  "metrics": {
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    "waveform_l2": {},
    "spectrogram_l2": {
      "window": "hann_periodic",
      "n_fft": 2048,
      "hop": 512
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  },
  "fields": {
    "format": "hdf5",
    "quantity": "normal displacement of the mid-surface, u . n, at the mid-surface point above each grid point; NaN outside the disk and inside the hole",
    "units": "m",
    "axes": [
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      "y",
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    ],
    "shape": [
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      61,
      61
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    "frame_rate_hz": 1000,
    "dtype": "float32"
  },
  "reference_solution": null,
  "model": "saint-venant-kirchhoff"
}