Optimization of Heat Transfer Model Based on Greedy Algorithm

Aiming at the problem of furnace temperature curve, this paper uses Fourier's law heat conduction and Newton's cooling to establish a transfer model obtain changing welding area curve; single-objective optimization maximum conveyor belt passing speed find out optimal for each zone; greedy algorithm traversal search are used undetermined parameters dual-objective through local optimization. In response question 1, it is required study change in center area. First, we set from convection law. The interface reflow two-dimensional: direction x-axis vertical y-axis. energy balance method relationship between x y-axis differential equation, after then use Newton Cooling Law distribution difference equation zone temperature. This numerical calculation solve sets, obtaining statistics temperatures intervals 0.5s. theoretical curve drawn as well. second requires was determined constraints process limit must be met. A established taken objective function. Without exceeding problem, 92.6cm/min computer finished programme. For three, suitable belt-speed, making minimized which covered by 217°C under peak point. establishes model, where function minimum coverage area; same five above 2. We programming software feasible solution: preheating 167 °C, constant 6 185.1°C, 7 225°C, 259.2°C, 91.2cm/min. four, make symmetrical value possible while considering defines symmetry coefficient quantify symmetry. On basis, first established, converted into constraint conditions, transformed unknown finally determined. full needs determine 5 so time-consuming. Therefore, some parameters, simplify calculation. final result: 169.5°C, 185°C, 258.7°C, 90.4cm/min. Finally, discussed analyzed, comprehensively evaluated, conclusion made.