1{
2 "challenge_id": "cymbal-bell-v1",
3 "title": "Bowed bronze disk with a bell and a mounting hole, 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) = bow_height * (1 - r^2 / disk_radius^2) + (bell_height / 2) * (1 + cos(pi r / bell_radius)) * [r < bell_radius], hole_radius <= r <= disk_radius",
22 "thickness": "uniform, measured along the normal to the mid-surface",
23 "hole": "circular, radius hole_radius, centered on the axis, free edge"
24 },
25 "parameters": {
26 "disk_radius": 0.2032,
27 "bow_height": 0.025,
28 "bell_radius": 0.055,
29 "bell_height": 0.015,
30 "hole_radius": 0.006,
31 "h": 0.001,
32 "E": 110000000000.0,
33 "nu": 0.34,
34 "rho": 8800.0,
35 "sigma0": 1.1,
36 "eta": 1.2e-08,
37 "strike_x": 0.17272,
38 "strike_y": 0.0,
39 "strike_radius": 0.005,
40 "strike_duration": 0.001,
41 "strike_peak_force": 1000.0,
42 "strike_normalization_m2": 2.385927e-05,
43 "rho_air": 1.204,
44 "c_air": 343.0,
45 "listener_x": 0.06,
46 "listener_y": 0.08,
47 "listener_z": 0.5
48 },
49 "metrics": {
50 "primary": "waveform_l2",
51 "waveform_l2": {},
52 "spectrogram_l2": {
53 "window": "hann_periodic",
54 "n_fft": 2048,
55 "hop": 512
56 }
57 },
58 "fields": {
59 "format": "hdf5",
60 "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",
61 "units": "m",
62 "axes": [
63 "t",
64 "y",
65 "x"
66 ],
67 "shape": [
68 3001,
69 61,
70 61
71 ],
72 "frame_rate_hz": 1000,
73 "dtype": "float32"
74 },
75 "reference_solution": null,
76 "model": "saint-venant-kirchhoff"
77}