1{
2 "model": "Q4 Mindlin-Reissner FEM; sparse eigensolve; coupled Hunt-Crossley/Hertz impact",
3 "config": {
4 "width": 0.03,
5 "height": 0.03,
6 "thickness": 0.001,
7 "density": 2700.0,
8 "young": 68900000000.0,
9 "poisson": 0.33,
10 "material_q": 1400.0,
11 "shear_correction": 0.8333333333333334,
12 "mesh_x": 16,
13 "mesh_y": 16,
14 "hole_diameter": 0.0008,
15 "hole_edge_offset": 0.0015,
16 "thread_length": 0.2,
17 "thread_dashpot": 0.00075,
18 "hit_x": 0.0,
19 "hit_y": 0.0,
20 "hammer_mass": 0.01,
21 "hammer_tip_radius": 0.002,
22 "hammer_speed": 0.45,
23 "hammer_young": 200000000000.0,
24 "hammer_poisson": 0.29,
25 "restitution": 0.62,
26 "mic_distance": 0.35,
27 "air_density": 1.204,
28 "sound_speed": 343.0,
29 "sample_rate": 96000,
30 "duration": 4.0,
31 "modes": 72,
32 "normalize_dbfs": -1.0
33 },
34 "derived": {
35 "plate_mass_kg": 0.002428642831973649,
36 "fem_degrees_of_freedom": 867,
37 "retained_mode_count": 12,
38 "low_frequency_momentum_modes": 3,
39 "contact_duration_s": 0.00011718534618607626,
40 "impact_impulse_Ns": 0.0016584850018954377,
41 "peak_contact_force_N": 23.970981572218452,
42 "hammer_exit_velocity_m_s_positive_into_plate": 0.2841514204940169,
43 "plate_contact_point_exit_velocity_m_s_positive_into_plate": 0.48099945672947186,
44 "relative_separation_velocity_m_s": -0.19684803623545494,
45 "effective_relative_restitution": 0.4374400805232332,
46 "critical_frequency_hz": 12120.88938013311,
47 "unnormalized_peak_pressure_pa_approx": 4.7216855423089564e-08
48 },
49 "modes": [
50 {
51 "mode": 1,
52 "frequency_hz": 3636.1559922758443,
53 "q_total": 408.52934721279394,
54 "hit_participation": 2.65408506282041e-07,
55 "support_participation": 3.9601586076596717e-07,
56 "radiation_participation": 1.2000437536047182e-14
57 },
58 {
59 "mode": 2,
60 "frequency_hz": 8051.305581345652,
61 "q_total": 301.4657641622347,
62 "hit_participation": -2.9405292327351075e-06,
63 "support_participation": 39.652890438803574,
64 "radiation_participation": 6.833854201230942e-10
65 },
66 {
67 "mode": 3,
68 "frequency_hz": 9039.966872283216,
69 "q_total": 290.045426979398,
70 "hit_participation": 34.731473750403524,
71 "support_participation": -3.119227344042696,
72 "radiation_participation": -4.263546029355421e-11
73 },
74 {
75 "mode": 4,
76 "frequency_hz": 11215.971597875456,
77 "q_total": 265.96971557867914,
78 "hit_participation": -5.76698784577264e-07,
79 "support_participation": -9.557913690008505,
80 "radiation_participation": -8.487482880414638e-11
81 },
82 {
83 "mode": 5,
84 "frequency_hz": 11215.972189384156,
85 "q_total": 264.9631028602091,
86 "hit_participation": -6.503673939709411e-06,
87 "support_participation": -37.86151081853688,
88 "radiation_participation": -3.362485268790672e-10
89 },
90 {
91 "mode": 6,
92 "frequency_hz": 19188.80218623442,
93 "q_total": 212.48176215610172,
94 "hit_participation": -33.25757491594329,
95 "support_participation": 39.540338683284176,
96 "radiation_participation": 1.1996806505024452e-10
97 },
98 {
99 "mode": 7,
100 "frequency_hz": 23684.168413632236,
101 "q_total": 194.58706595905363,
102 "hit_participation": -6.696686471891198e-07,
103 "support_participation": 10.777021294339091,
104 "radiation_participation": 2.1457799319807075e-11
105 },
106 {
107 "mode": 8,
108 "frequency_hz": 23684.16887004039,
109 "q_total": 194.54860976090694,
110 "hit_participation": 6.795936473910993e-07,
111 "support_participation": -17.82397758956648,
112 "radiation_participation": -3.54982819398067e-11
113 },
114 {
115 "mode": 9,
116 "frequency_hz": 24995.07722130597,
117 "q_total": 190.1396356296486,
118 "hit_participation": -2.926971533901175e-07,
119 "support_participation": 8.37354246425821e-07,
120 "radiation_participation": -2.2663244544918025e-15
121 },
122 {
123 "mode": 10,
124 "frequency_hz": 26965.169996081924,
125 "q_total": 183.99220610636925,
126 "hit_participation": 1.8974319919597864e-07,
127 "support_participation": -1.59078243470191e-06,
128 "radiation_participation": 2.417011903121935e-15
129 },
130 {
131 "mode": 11,
132 "frequency_hz": 33477.73621021154,
133 "q_total": 167.38380491323127,
134 "hit_participation": 4.600119166074213e-09,
135 "support_participation": -1.8810414541936487,
136 "radiation_participation": -1.872514933365897e-12
137 },
138 {
139 "mode": 12,
140 "frequency_hz": 33477.73627769843,
141 "q_total": 167.24987805941555,
142 "hit_participation": 2.80533172219444e-07,
143 "support_participation": -36.677794201479905,
144 "radiation_participation": -3.6560501737062205e-11
145 }
146 ]
147}