added 118 prak

1 files changed, 47 insertions, 0 deletions

diff --git a/106/J.hpp b/106/J.hpp
new file mode 100644
index 0000000..a77b1d3
--- /dev/null
+++ b/106/J.hpp
@@ -0,0 +1,47 @@
+#pragma once
+#include "prakcommon.hpp"
+#include <array>
+
+inline constexpr const f64 PI = 3.141592657; // ;)
+
+inline constexpr const f64 rho_stl = 7800; // g/dm^3 (dm = decimeter)
+// delta d1 d2 d3 d4_1_ d1_ d2_ d3_ delta_
+inline constexpr const std::array d_stl = 
+   {0.0102, 0.0053, 0.0072, 0.0103, 0.0162, 0.0053, 0.0072, 0.0103, 0.0102};
+// lambd l1 l2 l3 l4_1_ l1_ l2_ l3_ lambd_
+inline constexpr const std::array l_stl = 
+   {0.0024, 0.0334, 0.03515, 0.071, 0.0053, 0.033, 0.0347, 0.07345, 0.0022};
+
+inline constexpr const f64 rho_alm = 2800; // g/dm^3 
+// d4_1 D1 d4_2_ D2
+inline constexpr const std::array d_alm =
+   {0.01575, 0.0806, 0.01675, 0.00555};
+// l4_1 L_ l4_2_ L
+inline constexpr const std::array l_alm =
+   {0.00635, 0.0111, 0.0053, 0.0205};
+
+
+constexpr inline f64 getJ(f64 m) {
+	f64 V1 = 0, V2 = 0;
+	f64 m1 = 0, m2 = 0;
+	f64 dm;
+	f64 J1 = 0, J2 = 0;
+	f64 D = d_alm.back() + d_alm[1];
+	for (size_t i = 0; i < d_stl.size(); ++i)
+		V1 += d_stl[i] * d_stl[i] * l_stl[i];
+	for (size_t i = 0; i < d_alm.size() - 1; ++i)
+		V2 += d_alm[i] * d_alm[i] * l_alm[i];
+	
+	m1 = PI * V1 * rho_stl / 4;
+	m2 = PI * rho_alm * (V2 + (D*D - d_alm[1]*d_alm[1]) * l_alm.back()) / 4;
+	dm = m - m1 - m2;
+	for (size_t i = 0; i < d_stl.size(); ++i) 
+		J1 += d_stl[i] * d_stl[i];
+	J1 *= m1/8;
+
+	for (size_t i = 0; i < d_alm.size(); ++i) 
+		J2 += d_alm[i] * d_alm[i];
+	J2 += D*D + d_alm[1]*d_alm[1];
+	J2 *= m2/8;
+	return J1+J2;
+}