{ "sweep": { "id": "outline", "title": "Sheet: outline at equal area (push and release)", "text": "Four outlines cut from the same amount of steel (216 square inches, the area of the default 12 by 18 inch sheet): the rectangle, a square, the ellipse of the same 2:3 proportions, and a circle. Everything else is held at the defaults, including the 3 mm bow across the width. The push acts at a corner for the rectangle and the square and at the rim point opposite the hole for the ellipse and the circle, so part of the difference is the excitation itself: a rim point of an ellipse is stiffer than the corner of a rectangle, and the same 10 mm push deforms the whole sheet rather than bending a corner.", "clips": [ { "label": "rectangle 12 x 18 in", "params": {} }, { "label": "square 14.7 x 14.7 in", "params": { "Lx": 0.37338, "Ly": 0.37338 } }, { "label": "ellipse 13.5 x 20.3 in", "params": { "shape": "ellipse", "Lx": 0.34392, "Ly": 0.51587 } }, { "label": "circle 16.6 in", "params": { "shape": "ellipse", "Lx": 0.42113, "Ly": 0.42113 } } ] }, "gainDb": 20, "clips": [ { "id": "outline-0", "label": "rectangle 12 x 18 in", "overrides": {}, "metrics": { "peakPa": 0.04646482318639755, "peakDbSpl": 67.32188586389826, "rmsPa": 0.0033498771907116485, "centroidHz": 195.7169225189091, "t60": { "20-100": 5.414347622298749, "100-500": 4.0120593180726445, "500-2k": 2.724403865668108, "2k-8k": 7.678595678417119 }, "bandLevelsDb": { "20-100": -1.153481711330091, "100-500": 0, "500-2k": -6.774905483785499, "2k-8k": -41.19767338483816 } }, "gainDb": 20, "peakDbfs": -6.657514222822115, "run": { "steps": 3072000, "seconds": 42.849673933, "nx": 39, "ny": 58, "dt": 0.0000013020833333333333, "maxContactForce": 0 } }, { "id": "outline-1", "label": "square 14.7 x 14.7 in", "overrides": { "Lx": 0.37338, "Ly": 0.37338 }, "metrics": { "peakPa": 0.04231245815753937, "peakDbSpl": 66.50876521790033, "rmsPa": 0.0028998146339706604, "centroidHz": 153.78177339593006, "t60": { "20-100": 5.176072339399107, "100-500": 3.820017095709612, "500-2k": 2.241561999735097, "2k-8k": 9.780195948134796 }, "bandLevelsDb": { "20-100": -1.3510534619823353, "100-500": 0, "500-2k": -14.446884787907162, "2k-8k": -52.06856588691713 } }, "gainDb": 20, "peakDbfs": -7.470634868820039, "run": { "steps": 3072000, "seconds": 42.348293672, "nx": 48, "ny": 48, "dt": 0.0000013020833333333333, "maxContactForce": 0 } }, { "id": "outline-2", "label": "ellipse 13.5 x 20.3 in", "overrides": { "shape": "ellipse", "Lx": 0.34392, "Ly": 0.51587 }, "metrics": { "peakPa": 0.14824815094470978, "peakDbSpl": 77.39918579159244, "rmsPa": 0.006297742425164596, "centroidHz": 151.43483142404193, "t60": { "20-100": 5.541885223616255, "100-500": 3.6135197136357577, "500-2k": 2.517116322913482, "2k-8k": 5.01921553930616 }, "bandLevelsDb": { "20-100": -4.0901172080218515, "100-500": 0, "500-2k": -5.60376521355435, "2k-8k": -31.47152866858852 } }, "gainDb": 20, "peakDbfs": 3.4197857048720732, "run": { "steps": 3072000, "seconds": 44.373019035999995, "nx": 44, "ny": 65, "dt": 0.0000013020833333333333, "maxContactForce": 0 } }, { "id": "outline-3", "label": "circle 16.6 in", "overrides": { "shape": "ellipse", "Lx": 0.42113, "Ly": 0.42113 }, "metrics": { "peakPa": 0.15776817500591278, "peakDbSpl": 77.93978812334517, "rmsPa": 0.00580468937676945, "centroidHz": 204.2454460973163, "t60": { "20-100": 5.958157976691518, "100-500": 4.140714994700199, "500-2k": 2.1795926718210104, "2k-8k": 5.894120197652497 }, "bandLevelsDb": { "20-100": -4.664294294628739, "100-500": 0, "500-2k": -14.347769638807126, "2k-8k": -53.3015134659577 } }, "gainDb": 20, "peakDbfs": 3.9603880366247832, "run": { "steps": 3072000, "seconds": 44.88345293100001, "nx": 54, "ny": 54, "dt": 0.0000013020833333333333, "maxContactForce": 0 } } ] }