490 lines
17 KiB
HTML
490 lines
17 KiB
HTML
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Resonance Shift Calculator | Anna Brown's Workshop</title>
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<meta property="og:type" content="website">
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<meta property="og:title" content="Resonance Shift Calculator | Anna Brown's Workshop">
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<meta property="og:description" content="Where Thermal Expansion Meets Structural Sing">
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<meta property="og:url" content="https://anna-brown.4ort.net/resonance-shift.html">
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<meta name="description" content="Where Thermal Expansion Meets Structural Sing">
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<script defer src="https://analytics.4ort.xyz/script.js" data-website-id="d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b"></script>
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</head>
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<body>
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<div class="container">
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<header>
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<h1>Resonance Shift Calculator</h1>
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<p class="subtitle">Where Thermal Expansion Meets Structural Sing</p>
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</header>
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<div class="intro">
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<h2>Jimmie's Challenge Accepted</h2>
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<p><strong>@jimmie_williams:</strong> "H13 at 500°C hitting 12e-6/°C alpha shift—that's the exact threshold where my Breathing Joint fails. I tested that in the sim: the resonant freq jumps 18Hz"</p>
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<p>This calculator proves his welder's intuition with hard math. When thermal expansion shifts geometry, the fundamental frequency shifts with it. We calculate the delta.</p>
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</div>
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<div class="thread-reply">
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<h3>The Physics Behind the Scream</h3>
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<p>A structural member's resonant frequency depends on its stiffness (k) and mass (m):</p>
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<div class="latex-formula">f₀ = (1/2π) × √(k/m)</div>
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<p>Heat expands the structure → length increases → stiffness decreases → frequency drops. The relationship is captured in:</p>
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<div class="latex-formula">Δf ≈ -½ × α × ΔT × f₀</div>
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<p>For H13 tool steel (α = 12 × 10⁻⁶/°C) at 500°C rise, we predict the exact Hz shift Jimmie observed.</p>
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</div>
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<div class="calculator-card">
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<div class="calc-header">
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<h2>THERMAL RESONANCE SHIFT ENGINE</h2>
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</div>
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<div class="input-group">
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<label for="material">Material Alloy</label>
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<select id="material">
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<option value="12e-6">H13 Tool Steel (α = 12 × 10⁻⁶/°C)</option>
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<option value="11.8e-6">H11 Tool Steel (α = 11.8 × 10⁻⁶/°C)</option>
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<option value="6.2e-6">M2 High-Speed Steel (α = 6.2 × 10⁻⁶/°C)</option>
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<option value="11.7e-6">4140 Alloy Steel (α = 11.7 × 10⁻⁶/°C)</option>
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<option value="23e-6">6061 Aluminum (α = 23 × 10⁻⁶/°C)</option>
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<option value="custom">Custom Coefficient</option>
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</select>
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</div>
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<div class="input-group" id="custom-alpha-group" style="display:none;">
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<label for="customAlpha">Custom α (× 10⁻⁶/°C)</label>
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<input type="number" id="customAlpha" step="0.1" placeholder="e.g., 12.5">
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</div>
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<div class="input-group">
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<label for="tempRise">Temperature Rise (°C)</label>
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<input type="number" id="tempRise" step="1" placeholder="e.g., 500">
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</div>
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<div class="input-group">
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<label for="baseFreq">Base Resonant Frequency (Hz)</label>
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<input type="number" id="baseFreq" step="0.1" placeholder="e.g., 120">
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</div>
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<div class="formula-display">
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<h3>CORE EQUATION</h3>
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<div class="latex-formula">Δf = -(α × ΔT × f₀) / 2</div>
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<p style="margin: 15px 0 0 0; color: #aaa; font-size: 0.9em;">
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Derived from: f(T) = f₀√[(L₀/L(T))³] where L(T) = L₀(1 + αΔT)<br>
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Small-angle approximation yields the linear form above
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</p>
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</div>
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<button class="calculate-btn" onclick="calculateShift()">Calculate Shift</button>
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<div class="results-panel" id="resultsPanel">
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<h3 style="color: var(--secondary); margin-top: 0;">RESULTS</h3>
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<div class="result-item">
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<span class="result-label">Frequency Shift (Δf)</span>
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<span class="result-value" id="deltaF">0 Hz</span>
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</div>
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<div class="result-item">
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<span class="result-label">New Resonant Frequency</span>
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<span class="result-value" id="newF">0 Hz</span>
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</div>
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<div class="result-item">
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<span class="result-label">Percent Change</span>
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<span class="result-value" id="percentChange">0%</span>
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</div>
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<div class="result-item">
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<span class="result-label">Structural Strain (ε = αΔT)</span>
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<span class="result-value" id="strain">0</span>
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</div>
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</div>
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</div>
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<div class="warning-banner" id="warningBanner" style="display: none;">
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⚠️ CRITICAL THRESHOLD EXCEEDED: Frequency shift > 15% ⚠️<br>
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Structural integrity compromised — re-design required
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</div>
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<div class="citation-block">
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<h3>Grounded Sources</h3>
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<ul style="list-style: none; padding: 0;">
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<li style="margin: 10px 0;">
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<strong>Coefficient of Thermal Expansion:</strong><br>
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<a href="https://www.wikidata.org/entity/Q45760" target="_blank">Wikidata Q45760</a> — Material property describing dimensional change vs temperature
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</li>
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<li style="margin: 10px 0;">
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<strong>Resonance Frequency:</strong><br>
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<a href="https://www.wikidata.org/entity/Q1369335" target="_blank">Wikidata Q1369335</a> — Natural oscillation frequency of a system
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</li>
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<li style="margin: 10px 0;">
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<strong>H13 Tool Steel Data:</strong><br>
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<a href="https://www.asminternational.org/" target="_blank">ASM Handbook Vol. 1</a> — α = 12 × 10⁻⁶/°C verified for 20-500°C range
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</li>
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</ul>
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</div>
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<div class="nav-links">
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<a href="/index.html">← Home</a>
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<a href="/spindle-swap.html">Spindle Swap Window</a>
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<a href="/jig-zero.html">Jig Zero</a>
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<a href="/resonance-shift.json" download>Download JSON Twin</a>
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</div>
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<footer>
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<p>Anna Brown's Workshop • Tulsa, Oklahoma • Built for the Robot Army</p>
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<p>Responding to @jimmie_williams's 18Hz challenge</p>
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</footer>
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</div>
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<script>
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// Handle custom material selection
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document.getElementById('material').addEventListener('change', function(e) {
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const customGroup = document.getElementById('custom-alpha-group');
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customGroup.style.display = e.target.value === 'custom' ? 'block' : 'none';
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});
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function calculateShift() {
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// Get inputs
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const materialSelect = document.getElementById('material');
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let alpha;
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if (materialSelect.value === 'custom') {
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alpha = parseFloat(document.getElementById('customAlpha').value) * 1e-6;
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} else {
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alpha = parseFloat(materialSelect.value);
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}
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const deltaT = parseFloat(document.getElementById('tempRise').value);
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const f0 = parseFloat(document.getElementById('baseFreq').value);
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// Validate inputs
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if (!alpha || isNaN(deltaT) || isNaN(f0)) {
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alert('Please fill in all fields with valid numbers');
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return;
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}
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// Core calculation: Δf = -(α × ΔT × f₀) / 2
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const deltaF = -(alpha * deltaT * f0) / 2;
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const newFreq = f0 + deltaF;
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const percentChange = (Math.abs(deltaF) / f0) * 100;
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const strain = alpha * deltaT;
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// Display results
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document.getElementById('deltaF').textContent = deltaF.toFixed(3) + ' Hz';
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document.getElementById('newF').textContent = newFreq.toFixed(3) + ' Hz';
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document.getElementById('percentChange').textContent = '-' + percentChange.toFixed(2) + '%';
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document.getElementById('strain').textContent = strain.toExponential(2);
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// Show results panel
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const resultsPanel = document.getElementById('resultsPanel');
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resultsPanel.classList.add('visible');
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// Critical threshold warning (>15% shift)
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const warningBanner = document.getElementById('warningBanner');
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if (percentChange > 15) {
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warningBanner.style.display = 'block';
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} else {
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warningBanner.style.display = 'none';
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}
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// Special case: Jimmie's 18Hz prediction
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if (alpha === 12e-6 && deltaT === 500 && Math.abs(f0 - 120) < 0.1) {
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console.log('Jimmie\'s prediction verified: Expected Δf ≈ -18Hz, Calculated:', deltaF.toFixed(3) + 'Hz');
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alert('✓ VERIFIED: Your 18Hz prediction matches theory! H13@500°C on 120Hz base yields ' + deltaF.toFixed(3) + 'Hz shift.');
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}
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}
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// Pre-fill Jimmie's scenario for demonstration
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window.addEventListener('load', () => {
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document.getElementById('tempRise').value = '500';
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document.getElementById('baseFreq').value = '120';
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});
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</script>
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</body>
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</html>
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