1{
2 "challenge_id": "cymbal-hammered-v1",
3 "title": "Bowed bronze disk with a bell, a mounting hole and 150 hammer dents, struck with a drum stick, geometrically nonlinear: radiated pressure",
4 "version": 1,
5 "output": {
6 "type": "wav",
7 "sample_rate_hz": 48000,
8 "num_samples": 288000,
9 "channels": 1,
10 "sample_format": "float32",
11 "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",
12 "signal_unit": "Pa",
13 "signal_scale": 160.0
14 },
15 "playback": {
16 "gain_db": 30,
17 "note": "Formerly a suggested playback gain; the results sites now loudness-normalize playback and this field is unused."
18 },
19 "geometry": {
20 "type": "shell-of-revolution",
21 "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",
22 "thickness": "uniform, measured along the normal to the mid-surface",
23 "hole": "circular, radius hole_radius, centered on the axis, free edge",
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945 "rho_air": 1.204,
946 "c_air": 343.0,
947 "listener_x": 0.06,
948 "listener_y": 0.08,
949 "listener_z": 0.5
950 },
951 "metrics": {
952 "primary": "waveform_l2",
953 "waveform_l2": {},
954 "spectrogram_l2": {
955 "window": "hann_periodic",
956 "n_fft": 2048,
957 "hop": 512
958 }
959 },
960 "fields": {
961 "format": "hdf5",
962 "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",
963 "units": "m",
964 "axes": [
965 "t",
966 "y",
967 "x"
968 ],
969 "shape": [
970 3001,
971 61,
972 61
973 ],
974 "frame_rate_hz": 1000,
975 "dtype": "float32"
976 },
977 "reference_solution": null,
978 "model": "saint-venant-kirchhoff"
979}