Add next batch of calculators and AWG support

hdyc-svelte/src/lib/engine.ts

@@ -181,6 +181,74 @@ export function solve(
         out.val1 = (!isNaN(v2) && v2 > 0) ? fmt(10 * Math.log10(v2)) : '';
       }
       break;
+
+    case 'awg': {
+      const log92 = Math.log(92);
+      const awgToDiameterMm = (g: number) => 0.127 * Math.pow(92, (36 - g) / 39);
+      const diameterMmToAwg = (d: number) => 36 - 39 * Math.log(d / 0.127) / log92;
+      const awgToCircularMils = (g: number) => 1000 * Math.pow(92, (36 - g) / 19.5);
+      const circularMilsToAwg = (a: number) => 36 - 19.5 * Math.log(a / 1000) / log92;
+      const awgToAreaMm2 = (g: number) => {
+        const d = awgToDiameterMm(g);
+        return Math.PI * Math.pow(d, 2) / 4;
+      };
+      const areaMm2ToAwg = (a: number) => {
+        const d = Math.sqrt((4 * a) / Math.PI);
+        return diameterMmToAwg(d);
+      };
+
+      const slug = calc.slug;
+      const formatAwg = (g: number) => isFinite(g) ? fmt(g) : '';
+
+      if (slug.includes('circular-mils')) {
+        if (source === 1) {
+          out.val2 = !isNaN(v1) ? fmt(awgToCircularMils(v1)) : '';
+        } else {
+          out.val1 = (!isNaN(v2) && v2 > 0) ? formatAwg(circularMilsToAwg(v2)) : '';
+        }
+      } else if (slug.includes('square-millimeters')) {
+        if (source === 1) {
+          out.val2 = !isNaN(v1) ? fmt(awgToAreaMm2(v1)) : '';
+        } else {
+          out.val1 = (!isNaN(v2) && v2 > 0) ? formatAwg(areaMm2ToAwg(v2)) : '';
+        }
+      } else {
+        // diameter in millimeters
+        if (source === 1) {
+          out.val2 = !isNaN(v1) ? fmt(awgToDiameterMm(v1)) : '';
+        } else {
+          out.val1 = (!isNaN(v2) && v2 > 0) ? formatAwg(diameterMmToAwg(v2)) : '';
+        }
+      }
+      break;
+    }
+
+    case 'brinell-rockwell': {
+      // Approximate correlation for steels:
+      // BHN = (1520000 - 4500 * HRC) / (100 - HRC)^2
+      if (source === 1) {
+        // Brinell to Rockwell C
+        if (!isNaN(v1) && v1 > 0) {
+          const a = v1;
+          const disc = 4500 ** 2 + 4 * a * 1070000;
+          const y = (4500 + Math.sqrt(disc)) / (2 * a);
+          const hrc = 100 - y;
+          out.val2 = fmt(hrc);
+        } else {
+          out.val2 = '';
+        }
+      } else {
+        // Rockwell C to Brinell
+        if (!isNaN(v2) && v2 < 100) {
+          const h = v2;
+          const bhn = (1520000 - 4500 * h) / Math.pow(100 - h, 2);
+          out.val1 = fmt(bhn);
+        } else {
+          out.val1 = '';
+        }
+      }
+      break;
+    }
   }
 
   return out;