2 "challenge_id": "cymbal-tapered-v1",
3 "title": "Bowed, belled and hammered bronze disk lathed to a tapered thickness, 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": "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",
23 "hole": "circular, radius hole_radius, centered on the axis, free edge",
24 "dents": [
25 {
26 "x": 0.0825,
27 "y": 0.1364,
28 "radius": 0.012,
29 "depth": 0.0005
30 },
31 {
32 "x": -0.0954,
33 "y": -0.0907,
34 "radius": 0.012,
35 "depth": 0.0005
36 },
37 {
38 "x": 0.0391,
39 "y": -0.0709,
40 "radius": 0.012,
41 "depth": 0.0005
42 },
43 {
44 "x": -0.1234,
45 "y": -0.1047,
46 "radius": 0.012,
47 "depth": 0.0005
48 },
49 {
50 "x": 0.0635,
51 "y": 0.0835,
52 "radius": 0.012,
53 "depth": 0.0005
54 },
55 {
56 "x": 0.1357,
57 "y": 0.0222,
58 "radius": 0.012,
59 "depth": 0.0005
60 },
61 {
62 "x": 0.1397,
63 "y": -0.0554,
64 "radius": 0.012,
65 "depth": 0.0005
66 },
67 {
68 "x": 0.1573,
69 "y": 0.0442,
70 "radius": 0.012,
71 "depth": 0.0005
72 },
73 {
74 "x": -0.0826,
75 "y": -0.0123,
76 "radius": 0.012,
77 "depth": 0.0005
78 },
79 {
80 "x": -0.1746,
81 "y": 0.0372,
82 "radius": 0.012,
83 "depth": 0.0005
84 },
85 {
86 "x": -0.029,
87 "y": 0.1539,
88 "radius": 0.012,
89 "depth": 0.0005
90 },
91 {
92 "x": 0.0338,
93 "y": 0.0978,
94 "radius": 0.012,
95 "depth": 0.0005
96 },
97 {
98 "x": 0.0172,
99 "y": -0.1003,
100 "radius": 0.012,
101 "depth": 0.0005
102 },
103 {
104 "x": 0.0996,
105 "y": -0.121,
106 "radius": 0.012,
107 "depth": 0.0005
108 },
109 {
110 "x": 0.1638,
111 "y": 0.0864,
112 "radius": 0.012,
113 "depth": 0.0005
114 },
115 {
116 "x": -0.0241,
117 "y": -0.1837,
118 "radius": 0.012,
119 "depth": 0.0005
120 },
121 {
122 "x": 0.1746,
123 "y": -0.0303,
124 "radius": 0.012,
125 "depth": 0.0005
126 },
127 {
128 "x": -0.1251,
129 "y": 0.0695,
130 "radius": 0.012,
131 "depth": 0.0005
132 },
133 {
134 "x": 0.0147,
135 "y": 0.1317,
136 "radius": 0.012,
137 "depth": 0.0005
138 },
139 {
140 "x": -0.1528,
141 "y": 0.1122,
142 "radius": 0.012,
143 "depth": 0.0005
144 }
145 ]
146 },
147 "parameters": {
148 "disk_radius": 0.2032,
149 "bow_height": 0.025,
150 "bell_radius": 0.055,
151 "bell_height": 0.015,
152 "hole_radius": 0.006,
153 "thickness_center": 0.0012,
154 "thickness_rim": 0.0007,
155 "E": 110000000000.0,
156 "nu": 0.34,
157 "rho": 8800.0,
158 "sigma0": 1.1,
159 "eta": 1.2e-08,
160 "strike_x": 0.17272,
161 "strike_y": 0.0,
162 "strike_radius": 0.005,
163 "strike_duration": 0.001,
164 "strike_peak_force": 1000.0,
165 "strike_normalization_m2": 2.386766e-05,
166 "rho_air": 1.204,
167 "c_air": 343.0,
168 "listener_x": 0.06,
169 "listener_y": 0.08,
170 "listener_z": 0.5
171 },
172 "metrics": {
173 "primary": "waveform_l2",
174 "waveform_l2": {},
175 "spectrogram_l2": {
176 "window": "hann_periodic",
177 "n_fft": 2048,
178 "hop": 512
179 }
180 },
181 "fields": {
182 "format": "hdf5",
183 "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",
184 "units": "m",
185 "axes": [
186 "t",
187 "y",
188 "x"
189 ],
190 "shape": [
191 3001,
192 61,
193 61
194 ],
195 "frame_rate_hz": 1000,
196 "dtype": "float32"
197 },
198 "reference_solution": null,
199 "model": "saint-venant-kirchhoff"
200}