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acb1e49 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | // Room Acoustics Calculator Logic
class RoomAcousticsCalculator {
constructor() {
this.speedOfSound = 343; // m/s
this.roomDimensions = { length: 5, width: 4, height: 3 };
this.subwooferPosition = { x: 2.5, y: 2, z: 1.5 };
this.modes = [];
this.init();
}
init() {
this.calculateModes();
}
setRoomDimensions(dimensions) {
this.roomDimensions = dimensions;
this.calculateModes();
}
setSubwooferPosition(position) {
this.subwooferPosition = position;
this.calculatePressureDistribution();
}
calculateModes(maxFrequency = 200) {
const { length, width, height } = this.roomDimensions;
this.modes = [];
// Maximum mode numbers based on max frequency
const maxN = Math.ceil((2 * maxFrequency * length) / this.speedOfSound);
const maxM = Math.ceil((2 * maxFrequency * width) / this.speedOfSound);
const maxP = Math.ceil((2 * maxFrequency * height) / this.speedOfSound);
for (let n = 0; n <= maxN; n++) {
for (let m = 0; m <= maxM; m++) {
for (let p = 0; p <= maxP; p++) {
if (n === 0 && m === 0 && p === 0) continue;
const frequency = (this.speedOfSound / 2) *
Math.sqrt(
Math.pow(n / length, 2) +
Math.pow(m / width, 2) +
Math.pow(p / height, 2)
);
if (frequency <= maxFrequency) {
let modeType = 'oblique';
if ((n > 0 && m === 0 && p === 0) ||
(n === 0 && m > 0 && p === 0) ||
(n === 0 && m === 0 && p > 0)) {
modeType = 'axial';
} else if ((n > 0 && m > 0 && p === 0) ||
(n > 0 && m === 0 && p > 0) ||
(n === 0 && m > 0 && p > 0)) {
modeType = 'tangential';
}
this.modes.push({
n, m, p,
frequency: parseFloat(frequency.toFixed(2)),
type: modeType
});
}
}
}
}
// Sort by frequency
this.modes.sort((a, b) => a.frequency - b.frequency);
return this.modes;
}
calculatePressureAtPosition(x, y, z) {
const { length, width, height } = this.roomDimensions;
let pressure = 0;
// Simplified pressure calculation based on mode shapes
this.modes.forEach(mode => {
const { n, m, p, frequency } = mode;
if (frequency >= 20 && frequency <= 200) {
// Mode shape function
const modeShape = Math.cos((n * Math.PI * x) / length) *
Math.cos((m * Math.PI * y) / width) *
Math.cos((p * Math.PI * z) / height);
// Pressure contribution (simplified)
pressure += Math.abs(modeShape) / (frequency * frequency);
}
});
return pressure;
}
calculatePressureDistribution() {
// This would normally generate a full 3D pressure map
// For now we'll just return pressure at subwoofer position
return this.calculatePressureAtPosition(
this.subwooferPosition.x,
this.subwooferPosition.y,
this.subwooferPosition.z
);
}
getCriticalFrequencies() {
const { length, width, height } = this.roomDimensions;
return [
{
name: "Length Axial",
frequency: parseFloat(((this.speedOfSound / 2) / length).toFixed(2)),
dimension: "length"
},
{
name: "Width Axial",
frequency: parseFloat(((this.speedOfSound / 2) / width).toFixed(2)),
dimension: "width"
},
{
name: "Height Axial",
frequency: parseFloat(((this.speedOfSound / 2) / height).toFixed(2)),
dimension: "height"
}
];
}
}
// Global calculator instance
const calculator = new RoomAcousticsCalculator();
// Utility functions
function updateResults() {
document.dispatchEvent(new CustomEvent('calculatorUpdated', {
detail: {
modes: calculator.modes,
criticalFrequencies: calculator.getCriticalFrequencies(),
pressure: calculator.calculatePressureDistribution()
}
}));
}
// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
updateResults();
});
// Export for use in components
window.calculator = calculator;
window.updateResults = updateResults; |