Research And Application Of Temperature Control Strategies Based On Distributed Parameter System In Large-Scale Vertical Quench Furnace

Large-scale vertical quench furnace is a kind of critical equipment for thermal treatment of high-strength aluminum alloy components widely used in aerospace industry, such as the end collar of rocket and missile, landing chassis, torpedo shell and so on. The traditional temperature control strategies only based on lumped parameter system theories cannot meet the needs of the special quench technology of the components with the development of aerospace engineering and national defense construction.The structure of Large-scale vertical quenching furnace is complex; three types of heat transfer are combined; the components temperature in furnace cannot be measured directly; temperature distribution is non-homogeneity characteristically; the multi-zone heating mode adopted in this furnace leads to close coupling between adjacent zones. To the best of our knowledge, there is few of literature which investigates the control strategies on large-scale periodical vertical heating furnace system based on distribution parameter system(DPS) theory. With the features above mentioned, this dissertation proposes a series of control technologies for distributed parameter system, which include temperature compensation, dynamic modeling, parameter identification, decoupling control and so on. The application of DPS control strategies solves some temperature control problems of large-scale quench furnace such as low control precision, large overshoot during rising process causing over-burning accidents, and meets the needs of low overshoot and quick rising process, high precision and uniformity of temperature during holding period in the furnace.In this dissertation, a kind of method is proposed to measure the temperature of component which cannot be measured directly because it is suspended in the furnace. According to the analysis of complex heat exchange mechanism in the furnace, the model of temperature field is established. By the utilization of the numerical analysis result, the temperatures of component are compensated to meet the strict demand on quench technological temperature.By the simplification of complex furnace structure, the second order...