1{
2 "sweep": {
3 "id": "strike-stiffness",
4 "title": "Drumstick: tip hardness",
5 "text": "The Hertz contact stiffness K stands for the hardness of the tip: a soft (rubber or felt) tip has a low K and a long, gentle contact that excites mainly the low modes; a hard tip (dense wood, or a metal beater) has a high K and a sharp click.",
6 "base": {
7 "excitation": "strike"
8 },
9 "param": "contactStiffness",
10 "unit": "N/m^1.5",
11 "values": [
12 5000000,
13 50000000,
14 500000000,
15 5000000000
16 ]
17 },
18 "gainDb": -6,
19 "clips": [
20 {
21 "id": "strike-stiffness-0",
22 "label": "5000000 N/m^1.5",
23 "overrides": {
24 "excitation": "strike",
25 "contactStiffness": 5000000,
26 "spacing": 0.004
27 },
28 "metrics": {
29 "peakPa": 0.26147589087486267,
30 "peakDbSpl": 82.32803311386806,
31 "rmsPa": 0.004232388183234962,
32 "centroidHz": 404.3643280006084,
33 "t60": {
34 "20-100": 5.757894846130037,
35 "100-500": 4.352052842426992,
36 "500-2k": 2.55615996294041,
37 "2k-8k": 4.318042557827629
38 },
39 "bandLevelsDb": {
40 "20-100": -9.964902271720613,
41 "100-500": 0,
42 "500-2k": 0.13898452411637408,
43 "2k-8k": -10.977715328278927
44 }
45 },
46 "gainDb": -6,
47 "peakDbfs": -17.651366972852305,
48 "run": {
49 "steps": 6144000,
50 "seconds": 62.01993563700002,
51 "nx": 77,
52 "ny": 115,
53 "dt": 6.510416666666666e-7,
54 "maxContactForce": 112.884765625
55 }
56 },
57 {
58 "id": "strike-stiffness-1",
59 "label": "50000000 N/m^1.5",
60 "overrides": {
61 "excitation": "strike",
62 "contactStiffness": 50000000,
63 "spacing": 0.004
64 },
65 "metrics": {
66 "peakPa": 1.0846350193023682,
67 "peakDbSpl": 94.68507253208466,
68 "rmsPa": 0.006363170396865752,
69 "centroidHz": 381.31414345875294,
70 "t60": {
71 "20-100": 5.280974643647922,
72 "100-500": 4.6467158809535976,
73 "500-2k": 2.334056839108303,
74 "2k-8k": 4.084407377811061
75 },
76 "bandLevelsDb": {
77 "20-100": -6.5733765284632995,
78 "100-500": 0,
79 "500-2k": 0.7208944687813243,
80 "2k-8k": -3.989663805043616
81 }
82 },
83 "gainDb": -6,
84 "peakDbfs": -5.294327554635715,
85 "run": {
86 "steps": 6144000,
87 "seconds": 62.09568580800004,
88 "nx": 77,
89 "ny": 115,
90 "dt": 6.510416666666666e-7,
91 "maxContactForce": 149.91244506835938
92 }
93 },
94 {
95 "id": "strike-stiffness-2",
96 "label": "500000000 N/m^1.5",
97 "overrides": {
98 "excitation": "strike",
99 "contactStiffness": 500000000,
100 "spacing": 0.004
101 },
102 "metrics": {
103 "peakPa": 2.205117702484131,
104 "peakDbSpl": 100.84803560157386,
105 "rmsPa": 0.00951895798535143,
106 "centroidHz": 435.21529790921534,
107 "t60": {
108 "20-100": 5.627390472686013,
109 "100-500": 4.5707678921683526,
110 "500-2k": 2.5907910666908407,
111 "2k-8k": 3.9744633879876843
112 },
113 "bandLevelsDb": {
114 "20-100": -1.3514353071700143,
115 "100-500": 0,
116 "500-2k": 1.187547735231874,
117 "2k-8k": 1.994130612116379
118 }
119 },
120 "gainDb": -6,
121 "peakDbfs": 0.8686355148534772,
122 "run": {
123 "steps": 6144000,
124 "seconds": 62.016054563999994,
125 "nx": 77,
126 "ny": 115,
127 "dt": 6.510416666666666e-7,
128 "maxContactForce": 179.2267303466797
129 }
130 },
131 {
132 "id": "strike-stiffness-3",
133 "label": "5000000000 N/m^1.5",
134 "overrides": {
135 "excitation": "strike",
136 "contactStiffness": 5000000000,
137 "spacing": 0.004
138 },
139 "metrics": {
140 "peakPa": 2.799502372741699,
141 "peakDbSpl": 102.92101688514211,
142 "rmsPa": 0.010296969727946671,
143 "centroidHz": 462.5488108949825,
144 "t60": {
145 "20-100": 5.530095833056142,
146 "100-500": 4.8387802324309686,
147 "500-2k": 2.51660172043016,
148 "2k-8k": 4.128108170089937
149 },
150 "bandLevelsDb": {
151 "20-100": -1.642638730080165,
152 "100-500": 0,
153 "500-2k": 1.0920924916927817,
154 "2k-8k": 2.0863083221425214
155 }
156 },
157 "gainDb": -6,
158 "peakDbfs": 2.9416167984217316,
159 "run": {
160 "steps": 6144000,
161 "seconds": 61.991915126000066,
162 "nx": 77,
163 "ny": 115,
164 "dt": 6.510416666666666e-7,
165 "maxContactForce": 354.15325927734375
166 }
167 }
168 ]
169}