1{
2 "challenge_id": "cymbal-bow-v1",
3 "title": "Bowed bronze disk (paraboloidal shell) struck with a drum stick, geometrically nonlinear: radiated pressure",
4 "version": 1,
5 "status": "draft",
6 "output": {
7 "type": "wav",
8 "sample_rate_hz": 48000,
9 "num_samples": 288000,
10 "channels": 1,
11 "sample_format": "float32",
12 "signal": "acoustic pressure at the listener point from the Rayleigh-type integral of the normal acceleration over the top face",
13 "signal_unit": "Pa",
14 "signal_scale": null
15 },
16 "playback": {
17 "gain_db": 30,
18 "note": "Suggested playback gain for listening; presentation only, not part of the deliverable."
19 },
20 "geometry": {
21 "type": "shell-of-revolution",
22 "mid_surface": "z = Z(r) = bow_height * (1 - r^2 / disk_radius^2), 0 <= r <= disk_radius",
23 "thickness": "uniform, measured along the normal to the mid-surface",
24 "hole": null
25 },
26 "parameters": {
27 "disk_radius": 0.2032,
28 "bow_height": 0.025,
29 "h": 0.001,
30 "E": 110000000000.0,
31 "nu": 0.34,
32 "rho": 8800.0,
33 "sigma0": 1.1,
34 "eta": 1.2e-08,
35 "strike_x": 0.17272,
36 "strike_y": 0.0,
37 "strike_radius": 0.005,
38 "strike_duration": 0.001,
39 "strike_peak_force": 1000.0,
40 "rho_air": 1.204,
41 "c_air": 343.0,
42 "listener_x": 0.06,
43 "listener_y": 0.08,
44 "listener_z": 0.5,
45 "strike_normalization_m2": 2.385927e-05
46 },
47 "metrics": {
48 "primary": "waveform_l2",
49 "waveform_l2": {},
50 "spectrogram_l2": {
51 "window": "hann_periodic",
52 "n_fft": 2048,
53 "hop": 512
54 }
55 },
56 "fields": {
57 "format": "hdf5",
58 "quantity": "normal displacement of the mid-surface, u . n, at the mid-surface point above each grid point; NaN outside the disk",
59 "units": "m",
60 "axes": [
61 "t",
62 "y",
63 "x"
64 ],
65 "shape": [
66 3001,
67 61,
68 61
69 ],
70 "frame_rate_hz": 1000,
71 "dtype": "float32"
72 },
73 "reference_solution": null,
74 "model": "saint-venant-kirchhoff"
75}