Gallery: 31 sweep(s) rendered
19 changed files+312−9
docs/gallery/clips/ellipse-bow-shape-strike-0.jsonadded+37−0View file
@@ -0,0 +1,37 @@
1+{
2+ "id": "ellipse-bow-shape-strike-0",
3+ "label": "across the width",
4+ "overrides": {
5+ "shape": "ellipse",
6+ "excitation": "strike",
7+ "bowShape": "width"
8+ },
9+ "metrics": {
10+ "peakPa": 2.2176148891448975,
11+ "peakDbSpl": 100.89712266292102,
12+ "rmsPa": 0.008946726631898947,
13+ "centroidHz": 748.1208363002905,
14+ "t60": {
15+ "20-100": 4.896666413760261,
16+ "100-500": 3.5298827276714593,
17+ "500-2k": 2.4549279346876616,
18+ "2k-8k": 4.04392384620546
19+ },
20+ "bandLevelsDb": {
21+ "20-100": -6.632769122177063,
22+ "100-500": 0,
23+ "500-2k": 3.754155648128954,
24+ "2k-8k": -1.3141029946696783
25+ }
26+ },
27+ "gainDb": 20,
28+ "peakDbfs": 26.917722576200653,
29+ "run": {
30+ "steps": 3072000,
31+ "seconds": 38.296312427999915,
32+ "nx": 39,
33+ "ny": 58,
34+ "dt": 0.0000013020833333333333,
35+ "maxContactForce": 195.29598999023438
36+ }
37+}
docs/gallery/clips/ellipse-bow-shape-strike-0.pngadded+0−0View file
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docs/gallery/clips/ellipse-bow-shape-strike-0.wavadded+0−0View file
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docs/gallery/clips/ellipse-bow-shape-strike-1.jsonadded+37−0View file
@@ -0,0 +1,37 @@
1+{
2+ "id": "ellipse-bow-shape-strike-1",
3+ "label": "across the height",
4+ "overrides": {
5+ "shape": "ellipse",
6+ "excitation": "strike",
7+ "bowShape": "height"
8+ },
9+ "metrics": {
10+ "peakPa": 2.217863082885742,
11+ "peakDbSpl": 100.8980947265668,
12+ "rmsPa": 0.008821855441478631,
13+ "centroidHz": 488.5860793947992,
14+ "t60": {
15+ "20-100": 4.690138376690323,
16+ "100-500": 3.7647348715630797,
17+ "500-2k": 2.3009617474809607,
18+ "2k-8k": 3.9192885021341732
19+ },
20+ "bandLevelsDb": {
21+ "20-100": -5.0006889983056055,
22+ "100-500": 0,
23+ "500-2k": -0.5363220304269021,
24+ "2k-8k": -0.8067911659302567
25+ }
26+ },
27+ "gainDb": 20,
28+ "peakDbfs": 26.918694639846407,
29+ "run": {
30+ "steps": 3072000,
31+ "seconds": 38.24483309199987,
32+ "nx": 39,
33+ "ny": 58,
34+ "dt": 0.0000013020833333333333,
35+ "maxContactForce": 195.6182403564453
36+ }
37+}
docs/gallery/clips/ellipse-bow-shape-strike-1.pngadded+0−0View file
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docs/gallery/clips/ellipse-bow-shape-strike-1.wavadded+0−0View file
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docs/gallery/clips/ellipse-bow-shape-strike-2.jsonadded+37−0View file
@@ -0,0 +1,37 @@
1+{
2+ "id": "ellipse-bow-shape-strike-2",
3+ "label": "dish",
4+ "overrides": {
5+ "shape": "ellipse",
6+ "excitation": "strike",
7+ "bowShape": "dish"
8+ },
9+ "metrics": {
10+ "peakPa": 2.2178492546081543,
11+ "peakDbSpl": 100.89804057026272,
12+ "rmsPa": 0.008864408199717153,
13+ "centroidHz": 504.1569802239255,
14+ "t60": {
15+ "20-100": 5.203467470269461,
16+ "100-500": 3.5613116091425923,
17+ "500-2k": 2.1457110556471672,
18+ "2k-8k": 3.529067090471155
19+ },
20+ "bandLevelsDb": {
21+ "20-100": -0.5457352576049956,
22+ "100-500": 0,
23+ "500-2k": 1.084210977477813,
24+ "2k-8k": -1.6025466012395952
25+ }
26+ },
27+ "gainDb": 20,
28+ "peakDbfs": 26.918640483542355,
29+ "run": {
30+ "steps": 3072000,
31+ "seconds": 37.78275301100011,
32+ "nx": 39,
33+ "ny": 58,
34+ "dt": 0.0000013020833333333333,
35+ "maxContactForce": 195.42669677734375
36+ }
37+}
docs/gallery/clips/ellipse-bow-shape-strike-2.pngadded+0−0View file
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docs/gallery/clips/ellipse-bow-shape-strike-2.wavadded+0−0View file
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docs/gallery/damping-inplane-strike.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-inplane-strike",
44 "title": "Damping: in-plane loss (drumstick strike)",
5- "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push.",
5+ "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push. Struck, the difference is plain: with no in-plane loss the stretching modes ring at several kilohertz and pull the centroid up to about 5 kHz.",
66 "param": "sigmaIn",
77 "unit": "1/s",
88 "values": [
docs/gallery/damping-inplane.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-inplane",
44 "title": "Damping: in-plane loss (push and release)",
5- "text": "The stretching modes of the sheet lie at several kilohertz and, once the sheet is curved, couple to transverse motion. Without their own loss they ring for the whole low-frequency decay.",
5+ "text": "The stretching modes of the sheet lie at several kilohertz and, once the sheet is curved, couple to transverse motion. Without their own loss they ring for the whole low-frequency decay. Under the push the effect on the metrics is small (the band above 2 kHz is more than 40 dB down in every case); it is mainly audible as a faint high ring late in the decay when the loss is zero.",
66 "param": "sigmaIn",
77 "unit": "1/s",
88 "values": [
docs/gallery/damping-sigma0-strike.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-sigma0-strike",
44 "title": "Damping: frequency-independent loss (drumstick strike)",
5- "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push.",
5+ "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push. The decay of the low band follows the same rule, while the brightness changes less than it does under the push.",
66 "param": "sigma0",
77 "unit": "1/s",
88 "values": [
docs/gallery/damping-sigma0.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-sigma0",
44 "title": "Damping: frequency-independent loss (push and release)",
5- "text": "sigma0 sets the decay of the lowest modes (T60 = 6.9 / sigma0). It stands in for everything that damps the sheet uniformly: the suspension, air drag, the material.",
5+ "text": "sigma0 sets the decay of the lowest modes (T60 = 6.9 / sigma0). It stands in for everything that damps the sheet uniformly: the suspension, air drag, the material. In the clips the band below 100 Hz decays in roughly 12, 5 and 2 s (the 4 s clip cannot resolve the longest time well). A lower loss also leaves more time for the nonlinear transfer to the higher partials, so the less damped sheet is brighter as well as longer.",
66 "param": "sigma0",
77 "unit": "1/s",
88 "values": [
docs/gallery/damping-sigma1-strike.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-sigma1-strike",
44 "title": "Damping: frequency-dependent loss (drumstick strike)",
5- "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push.",
5+ "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push. Struck, the difference is more audible: the lowest value gives a long metallic ring with a centroid near 3.8 kHz, and the highest a dull thud with a centroid near 220 Hz.",
66 "param": "sigma1",
77 "unit": "m^2/s",
88 "values": [
docs/gallery/damping-sigma1.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "damping-sigma1",
44 "title": "Damping: frequency-dependent loss (push and release)",
5- "text": "sigma1 makes the high modes decay faster, in proportion to the square of their wavenumber; it stands mainly for radiation into the air. Too little and the highs ring like a cymbal; too much and the sheet sounds dull.",
5+ "text": "sigma1 makes the high modes decay faster, in proportion to the square of their wavenumber; it stands mainly for radiation into the air. Too little and the highs ring like a cymbal; too much and the sheet sounds dull. At the lowest value here the band above 2 kHz decays about as slowly as the low modes; at the highest it sits more than 50 dB below the 100 to 500 Hz band.",
66 "param": "sigma1",
77 "unit": "m^2/s",
88 "values": [
docs/gallery/ellipse-bow-shape-strike.jsonadded+145−0View file
@@ -0,0 +1,145 @@
1+{
2+ "sweep": {
3+ "id": "ellipse-bow-shape-strike",
4+ "title": "Ellipse: shape of the bow (drumstick strike)",
5+ "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the push.",
6+ "base": {
7+ "shape": "ellipse",
8+ "excitation": "strike"
9+ },
10+ "clips": [
11+ {
12+ "label": "across the width",
13+ "params": {
14+ "bowShape": "width"
15+ }
16+ },
17+ {
18+ "label": "across the height",
19+ "params": {
20+ "bowShape": "height"
21+ }
22+ },
23+ {
24+ "label": "dish",
25+ "params": {
26+ "bowShape": "dish"
27+ }
28+ }
29+ ]
30+ },
31+ "gainDb": 20,
32+ "clips": [
33+ {
34+ "id": "ellipse-bow-shape-strike-0",
35+ "label": "across the width",
36+ "overrides": {
37+ "shape": "ellipse",
38+ "excitation": "strike",
39+ "bowShape": "width"
40+ },
41+ "metrics": {
42+ "peakPa": 2.2176148891448975,
43+ "peakDbSpl": 100.89712266292102,
44+ "rmsPa": 0.008946726631898947,
45+ "centroidHz": 748.1208363002905,
46+ "t60": {
47+ "20-100": 4.896666413760261,
48+ "100-500": 3.5298827276714593,
49+ "500-2k": 2.4549279346876616,
50+ "2k-8k": 4.04392384620546
51+ },
52+ "bandLevelsDb": {
53+ "20-100": -6.632769122177063,
54+ "100-500": 0,
55+ "500-2k": 3.754155648128954,
56+ "2k-8k": -1.3141029946696783
57+ }
58+ },
59+ "gainDb": 20,
60+ "peakDbfs": 26.917722576200653,
61+ "run": {
62+ "steps": 3072000,
63+ "seconds": 38.296312427999915,
64+ "nx": 39,
65+ "ny": 58,
66+ "dt": 0.0000013020833333333333,
67+ "maxContactForce": 195.29598999023438
68+ }
69+ },
70+ {
71+ "id": "ellipse-bow-shape-strike-1",
72+ "label": "across the height",
73+ "overrides": {
74+ "shape": "ellipse",
75+ "excitation": "strike",
76+ "bowShape": "height"
77+ },
78+ "metrics": {
79+ "peakPa": 2.217863082885742,
80+ "peakDbSpl": 100.8980947265668,
81+ "rmsPa": 0.008821855441478631,
82+ "centroidHz": 488.5860793947992,
83+ "t60": {
84+ "20-100": 4.690138376690323,
85+ "100-500": 3.7647348715630797,
86+ "500-2k": 2.3009617474809607,
87+ "2k-8k": 3.9192885021341732
88+ },
89+ "bandLevelsDb": {
90+ "20-100": -5.0006889983056055,
91+ "100-500": 0,
92+ "500-2k": -0.5363220304269021,
93+ "2k-8k": -0.8067911659302567
94+ }
95+ },
96+ "gainDb": 20,
97+ "peakDbfs": 26.918694639846407,
98+ "run": {
99+ "steps": 3072000,
100+ "seconds": 38.24483309199987,
101+ "nx": 39,
102+ "ny": 58,
103+ "dt": 0.0000013020833333333333,
104+ "maxContactForce": 195.6182403564453
105+ }
106+ },
107+ {
108+ "id": "ellipse-bow-shape-strike-2",
109+ "label": "dish",
110+ "overrides": {
111+ "shape": "ellipse",
112+ "excitation": "strike",
113+ "bowShape": "dish"
114+ },
115+ "metrics": {
116+ "peakPa": 2.2178492546081543,
117+ "peakDbSpl": 100.89804057026272,
118+ "rmsPa": 0.008864408199717153,
119+ "centroidHz": 504.1569802239255,
120+ "t60": {
121+ "20-100": 5.203467470269461,
122+ "100-500": 3.5613116091425923,
123+ "500-2k": 2.1457110556471672,
124+ "2k-8k": 3.529067090471155
125+ },
126+ "bandLevelsDb": {
127+ "20-100": -0.5457352576049956,
128+ "100-500": 0,
129+ "500-2k": 1.084210977477813,
130+ "2k-8k": -1.6025466012395952
131+ }
132+ },
133+ "gainDb": 20,
134+ "peakDbfs": 26.918640483542355,
135+ "run": {
136+ "steps": 3072000,
137+ "seconds": 37.78275301100011,
138+ "nx": 39,
139+ "ny": 58,
140+ "dt": 0.0000013020833333333333,
141+ "maxContactForce": 195.42669677734375
142+ }
143+ }
144+ ]
145+}
docs/gallery/index.htmlmodified+48−1View file
@@ -52,7 +52,7 @@ svg.setup { display: block; max-width: 100%; height: auto; }
5252 </svg></div>
5353 <p class="dim">The setup: the sheet hangs from a thread through a hole near one corner. It is either pushed at the opposite corner by a fingertip, held until it settles, and released, or struck with a wooden drumstick. It has a slight bow, and the sound is computed 1 m in front of its center.</p>
5454 <p>Each section varies one property of the simulated sheet or of the excitation while everything else stays at the simulator defaults: a 12 by 18 inch, 22 gauge (0.79 mm) stainless steel sheet hanging in portrait orientation with a 3 mm bow across its width, heard 1 m in front of its center, recorded for 4 s. The clips are computed with the simulator's default numerical settings (8 mm grid), so the 'Open in simulator' links reproduce them exactly. Click a player to hear a clip. Every clip is rendered at the simulator's default playback level (+20 dB relative to 1 Pa at full scale, with the same soft clipper), so loudness differences within and between sections are the ones the model predicts, and a clip sounds as it does in the app. The numbers under each clip are the peak pressure and sound pressure level at the listener, the RMS pressure over the clip, the spectral centroid of the sound between 0.2 and 1.2 s (a measure of brightness), and fitted 60 dB decay times of a low and a high band.</p>
55-<ul class="toc"><li><a href="#strike-speed">Drumstick: stick speed</a></li><li><a href="#strike-mass">Drumstick: stick mass</a></li><li><a href="#strike-stiffness">Drumstick: tip hardness</a></li><li><a href="#strike-position">Drumstick: strike position</a></li><li><a href="#push-amount">Push and release: push amount</a></li><li><a href="#push-sign">Push and release: with or against the bow</a></li><li><a href="#push-release">Push and release: release time</a></li><li><a href="#bow-amplitude">Sheet: initial bow (push and release)</a></li><li><a href="#bow-amplitude-strike">Sheet: initial bow (drumstick strike)</a></li><li><a href="#bow-shape">Sheet: shape of the bow (push and release)</a></li><li><a href="#bow-shape-strike">Sheet: shape of the bow (drumstick strike)</a></li><li><a href="#thickness">Sheet: thickness (push and release)</a></li><li><a href="#thickness-strike">Sheet: thickness (drumstick strike)</a></li><li><a href="#size">Sheet: size (push and release)</a></li><li><a href="#size-strike">Sheet: size (drumstick strike)</a></li><li><a href="#outline">Sheet: outline at equal area (push and release)</a></li><li><a href="#outline-strike">Sheet: outline at equal area (drumstick strike)</a></li><li><a href="#ellipse-size">Ellipse: size (push and release)</a></li><li><a href="#ellipse-size-strike">Ellipse: size (drumstick strike)</a></li><li><a href="#ellipse-bow-amplitude">Ellipse: initial bow (push and release)</a></li><li><a href="#ellipse-bow-amplitude-strike">Ellipse: initial bow (drumstick strike)</a></li><li><a href="#ellipse-bow-shape">Ellipse: shape of the bow (push and release)</a></li><li><a href="#material">Sheet: material (push and release)</a></li><li><a href="#material-strike">Sheet: material (drumstick strike)</a></li><li><a href="#damping-sigma0">Damping: frequency-independent loss (push and release)</a></li><li><a href="#damping-sigma0-strike">Damping: frequency-independent loss (drumstick strike)</a></li><li><a href="#damping-sigma1">Damping: frequency-dependent loss (push and release)</a></li><li><a href="#damping-sigma1-strike">Damping: frequency-dependent loss (drumstick strike)</a></li><li><a href="#damping-inplane">Damping: in-plane loss (push and release)</a></li><li><a href="#damping-inplane-strike">Damping: in-plane loss (drumstick strike)</a></li></ul>
55+<ul class="toc"><li><a href="#strike-speed">Drumstick: stick speed</a></li><li><a href="#strike-mass">Drumstick: stick mass</a></li><li><a href="#strike-stiffness">Drumstick: tip hardness</a></li><li><a href="#strike-position">Drumstick: strike position</a></li><li><a href="#push-amount">Push and release: push amount</a></li><li><a href="#push-sign">Push and release: with or against the bow</a></li><li><a href="#push-release">Push and release: release time</a></li><li><a href="#bow-amplitude">Sheet: initial bow (push and release)</a></li><li><a href="#bow-amplitude-strike">Sheet: initial bow (drumstick strike)</a></li><li><a href="#bow-shape">Sheet: shape of the bow (push and release)</a></li><li><a href="#bow-shape-strike">Sheet: shape of the bow (drumstick strike)</a></li><li><a href="#thickness">Sheet: thickness (push and release)</a></li><li><a href="#thickness-strike">Sheet: thickness (drumstick strike)</a></li><li><a href="#size">Sheet: size (push and release)</a></li><li><a href="#size-strike">Sheet: size (drumstick strike)</a></li><li><a href="#outline">Sheet: outline at equal area (push and release)</a></li><li><a href="#outline-strike">Sheet: outline at equal area (drumstick strike)</a></li><li><a href="#ellipse-size">Ellipse: size (push and release)</a></li><li><a href="#ellipse-size-strike">Ellipse: size (drumstick strike)</a></li><li><a href="#ellipse-bow-amplitude">Ellipse: initial bow (push and release)</a></li><li><a href="#ellipse-bow-amplitude-strike">Ellipse: initial bow (drumstick strike)</a></li><li><a href="#ellipse-bow-shape">Ellipse: shape of the bow (push and release)</a></li><li><a href="#ellipse-bow-shape-strike">Ellipse: shape of the bow (drumstick strike)</a></li><li><a href="#material">Sheet: material (push and release)</a></li><li><a href="#material-strike">Sheet: material (drumstick strike)</a></li><li><a href="#damping-sigma0">Damping: frequency-independent loss (push and release)</a></li><li><a href="#damping-sigma0-strike">Damping: frequency-independent loss (drumstick strike)</a></li><li><a href="#damping-sigma1">Damping: frequency-dependent loss (push and release)</a></li><li><a href="#damping-sigma1-strike">Damping: frequency-dependent loss (drumstick strike)</a></li><li><a href="#damping-inplane">Damping: in-plane loss (push and release)</a></li><li><a href="#damping-inplane-strike">Damping: in-plane loss (drumstick strike)</a></li></ul>
5656 <section id="strike-speed">
5757 <h2>Drumstick: stick speed</h2>
5858 <p>A wooden stick tip (30 g effective mass) strikes the sheet at 70 percent of its width and 35 percent of its height. Speed sets both the loudness and the character: the contact force grows with speed, the contact shortens, and more energy reaches the high modes. In these clips the peak level rises from about 87 dB at 0.5 m/s to 109 dB at 6 m/s, and the spectral centroid from about 190 Hz to 1.6 kHz, so the sound grows brighter as well as louder.</p>
@@ -1353,6 +1353,53 @@ svg.setup { display: block; max-width: 100%; height: auto; }
13531353 <a href="../../?shape=ellipse&bowShape=dish">Open in simulator</a>
13541354 </div></div>
13551355 </section>
1356+<section id="ellipse-bow-shape-strike">
1357+<h2>Ellipse: shape of the bow (drumstick strike)</h2>
1358+<p>The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the push.</p>
1359+<p class="dim">Playback gain +20 dB relative to 1 Pa = 0 dBFS (the simulator's default is +20 dB); loud onsets are soft-clipped. Spectrograms: 0 to 5 kHz over the clip, 80 dB range, one color scale per section.</p>
1360+<div class="cards"><div class="card">
1361+ <div class="label">across the width</div>
1362+ <audio controls preload="none" src="clips/ellipse-bow-shape-strike-0.wav"></audio>
1363+ <img src="clips/ellipse-bow-shape-strike-0.png" alt="spectrogram" width="640" height="200">
1364+ <div class="metrics">
1365+ <div>peak 2.218 Pa (101 dB SPL)</div>
1366+ <div>RMS 8.9 mPa</div>
1367+ <div>centroid 748 Hz</div>
1368+ <div>T60 100-500 Hz 3.5 s, 2-8 kHz 4.0 s</div>
1369+ <div>contact force 195 N</div>
1370+ <div class="dim">wav peak 26.9 dBFS (soft-clipped)</div>
1371+ </div>
1372+ <a href="../../?shape=ellipse&excitation=strike&bowShape=width">Open in simulator</a>
1373+</div>
1374+<div class="card">
1375+ <div class="label">across the height</div>
1376+ <audio controls preload="none" src="clips/ellipse-bow-shape-strike-1.wav"></audio>
1377+ <img src="clips/ellipse-bow-shape-strike-1.png" alt="spectrogram" width="640" height="200">
1378+ <div class="metrics">
1379+ <div>peak 2.218 Pa (101 dB SPL)</div>
1380+ <div>RMS 8.8 mPa</div>
1381+ <div>centroid 489 Hz</div>
1382+ <div>T60 100-500 Hz 3.8 s, 2-8 kHz 3.9 s</div>
1383+ <div>contact force 196 N</div>
1384+ <div class="dim">wav peak 26.9 dBFS (soft-clipped)</div>
1385+ </div>
1386+ <a href="../../?shape=ellipse&excitation=strike&bowShape=height">Open in simulator</a>
1387+</div>
1388+<div class="card">
1389+ <div class="label">dish</div>
1390+ <audio controls preload="none" src="clips/ellipse-bow-shape-strike-2.wav"></audio>
1391+ <img src="clips/ellipse-bow-shape-strike-2.png" alt="spectrogram" width="640" height="200">
1392+ <div class="metrics">
1393+ <div>peak 2.218 Pa (101 dB SPL)</div>
1394+ <div>RMS 8.9 mPa</div>
1395+ <div>centroid 504 Hz</div>
1396+ <div>T60 100-500 Hz 3.6 s, 2-8 kHz 3.5 s</div>
1397+ <div>contact force 195 N</div>
1398+ <div class="dim">wav peak 26.9 dBFS (soft-clipped)</div>
1399+ </div>
1400+ <a href="../../?shape=ellipse&excitation=strike&bowShape=dish">Open in simulator</a>
1401+</div></div>
1402+</section>
13561403 <section id="material">
13571404 <h2>Sheet: material (push and release)</h2>
13581405 <p>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.</p>
docs/gallery/material-strike.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "material-strike",
44 "title": "Sheet: material (drumstick strike)",
5- "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push.",
5+ "text": "The same sweep excited by the default drumstick strike (30 g at 3 m/s) instead of the corner push. Struck, the aluminium sheet, at about a third of the mass of the steel one, is the loudest and by far the brightest (a centroid near 1.3 kHz), and the brass sheet is the lowest.",
66 "clips": [
77 {
88 "label": "stainless steel",
docs/gallery/material.jsonmodified+1−1View file
@@ -2,7 +2,7 @@
22 "sweep": {
33 "id": "material",
44 "title": "Sheet: material (push and release)",
5- "text": "Stainless steel, aluminium, and brass at the same thickness. The mode frequencies scale with the square root of E over rho, which differs little between these metals; the loss parameters are kept fixed, although real materials differ there too.",
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.",
66 "clips": [
77 {
88 "label": "stainless steel",