2 "sweep": {
3 "id": "material",
4 "title": "Sheet: material (push and release)",
87b10e4Gallery: 31 sweep(s) renderedJeremy Magland 5 "text": "Stainless steel, aluminium, and brass at the same thickness. The mode frequencies scale with the square root of E over rho, which is nearly the same for steel and aluminium but about 30 percent lower for brass, so the brass sheet sounds lower and, under the same push, about 7 dB quieter. The loss parameters are kept fixed, although real materials differ there too.",
7 {
8 "label": "stainless steel",
9 "params": {}
10 },
11 {
12 "label": "aluminium",
13 "params": {
14 "E": 69000000000,
15 "nu": 0.33,
16 "rho": 2700
17 }
18 },
19 {
20 "label": "brass",
21 "params": {
22 "E": 100000000000,
23 "nu": 0.34,
24 "rho": 8500
25 }
26 }
27 ]
28 },
29 "gainDb": 20,
30 "clips": [
31 {
32 "id": "material-0",
33 "label": "stainless steel",
34 "overrides": {},
35 "metrics": {
36 "peakPa": 0.04646482318639755,
37 "peakDbSpl": 67.32188586389826,
38 "rmsPa": 0.0033498771907116485,
39 "centroidHz": 195.7169225189091,
40 "t60": {
41 "20-100": 5.414347622298749,
42 "100-500": 4.0120593180726445,
43 "500-2k": 2.724403865668108,
44 "2k-8k": 7.678595678417119
45 },
46 "bandLevelsDb": {
47 "20-100": -1.153481711330091,
48 "100-500": 0,
49 "500-2k": -6.774905483785499,
50 "2k-8k": -41.19767338483816
51 }
52 },
53 "gainDb": 20,
54 "peakDbfs": -6.657514222822115,
55 "run": {
56 "steps": 3072000,
57 "seconds": 38.27293739399989,
58 "nx": 39,
59 "ny": 58,
60 "dt": 0.0000013020833333333333,
61 "maxContactForce": 0
62 }
63 },
64 {
65 "id": "material-1",
66 "label": "aluminium",
67 "overrides": {
68 "E": 69000000000,
69 "nu": 0.33,
70 "rho": 2700
71 },
72 "metrics": {
73 "peakPa": 0.05035024136304855,
74 "peakDbSpl": 68.0194312220062,
75 "rmsPa": 0.003492678898416886,
76 "centroidHz": 183.21553466514203,
77 "t60": {
78 "20-100": 5.498337065771734,
79 "100-500": 4.564126359434047,
80 "500-2k": 2.565587144399153,
81 "2k-8k": 6.723583639929413
82 },
83 "bandLevelsDb": {
84 "20-100": -2.9932848561957144,
85 "100-500": 0,
86 "500-2k": -10.022181667582874,
87 "2k-8k": -45.121356729870655
88 }
89 },
90 "gainDb": 20,
91 "peakDbfs": -5.959968864714163,
92 "run": {
93 "steps": 3264000,
94 "seconds": 36.20390067899996,
95 "nx": 39,
96 "ny": 58,
97 "dt": 0.0000012254901960784314,
98 "maxContactForce": 0
99 }
100 },
101 {
102 "id": "material-2",
103 "label": "brass",
104 "overrides": {
105 "E": 100000000000,
106 "nu": 0.34,
107 "rho": 8500
108 },
109 "metrics": {
110 "peakPa": 0.02168346755206585,
111 "peakDbSpl": 60.70197477532872,
112 "rmsPa": 0.0014097690584618998,
113 "centroidHz": 126.05140511329394,
114 "t60": {
115 "20-100": 5.095697871205659,
116 "100-500": 3.403340917525146,
117 "500-2k": 2.0914995889681656,
118 "2k-8k": 7.192616366975598
119 },
120 "bandLevelsDb": {
121 "20-100": 1.1833813329183052,
122 "100-500": 0,
123 "500-2k": -10.43347317183866,
124 "2k-8k": -39.10661850251927
125 }
126 },
127 "gainDb": 20,
128 "peakDbfs": -13.277425311391653,
129 "run": {
130 "steps": 2304000,
131 "seconds": 29.169522628000006,
132 "nx": 39,
133 "ny": 58,
134 "dt": 0.0000017361111111111112,
135 "maxContactForce": 0
136 }
137 }
138 ]
139}