private void tabPage5_Paint(object sender, PaintEventArgs e) { if (status5 == 1) { Graphics g = e.Graphics; //z轴挠度 for (int i = 0; i <= 100; i++) { double x = a * i / 100.0; myAverage[i] = -x; } for (int i = 101; i <= 400; i++) { double x = a * i / 100.0; myAverage[i] = 1 / 3.0 * (x - 4 * a); } for (int i = 401; i <= 500; i++) { myAverage[i] = 0; } for (int i = 0; i <= 500; i++) { myMyAverage[i] = my[i] * myAverage[i]; } double I = (pi * diameter1 * diameter1 * diameter1 * diameter1) / 64; double bendingZ = (MyCalculate.DefiniteIntegral(myMyAverage, 0, 500) * a / 100) / (E * I); g.DrawString("Δz= " + Math.Round(bendingZ * 1000, 3) + " mm", font1, brush1, 100, 100); //y轴挠度 for (int i = 0; i <= 500; i++) { mzAverage[i] = myAverage[i]; mzMzAverage[i] = mz[i] * mzAverage[i]; } double bendingY = (MyCalculate.DefiniteIntegral(mzMzAverage, 0, 500) * a / 100) / (E * I); g.DrawString("Δy= " + Math.Round(bendingY * 1000, 3) + " mm", font1, brush1, 100, 140); //总挠度 double bendingXY = Math.Sqrt(bendingZ * 1000 * bendingZ * 1000 + bendingY * 1000 * bendingY * 1000); g.DrawString("Δ= " + Math.Round(bendingXY, 3) + " mm", font1, brush1, 100, 180); } }