·306· 北京科技大学学报 1998年第3期 参考文献 1舒迪前.预测控制系统及其应用.北京：机械工业出版社，1996 2 Tamk D W.Hopfield J J.Simple Neural Optimization Netwoeks:AD A /D Converterm Signal Deci. sion Networks,and a Linear Programming Circnit.IEEE Trand CAS,1986,33:544 3石中锁.板形板神经网络预测控制与H控制系统的研究：[博士论文].北京：北京科技大学，1997 AGC-ASC Decoupled Neural Networks Predictive Control Method Shi Zhongsuo Sun Yikang Information Engineering School UST Beijing.Beijing 100083,China ABSTRACT The coupling models for the thickness-crown objects is established.A Dynamic Matrix Controller based on the TH neural networks is given with the conver- gence property.The computer simulations with the AGC-ASC decoupled neural networks predictive control system is complemented and it shows that the stable states of neural networks are reached with on more that one us,this has not only satisfied the fast prop- erty of rolling process,but also obtained a higher control index. KEY WORDS control/dynamic matrix control;neural networks;AGC-ASC synthetic system;convergence 中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中 (上接265页) Effects of Suspension Casting on Solidification Process of GCr15 Steel Ingot Yu Yan Zhai Oijie Xing Changhu Chen Jinbao Hu Hangi Foundry Institution.UST Beijing.Beijing 100083,China ABSTRACT The mechanism of inoculation in the case of suspension casting process has been studied through solidification kinetics.The effect of suspension casting process on temperature field,solidification rate,temperature gap of crystallization,effective distribu tion coefficient of solute and nucleation frequency during solidification process in steel ingot were discussed on the base of experiments.It has been found that the suspension casting process can increase both cooling rate and solidification rate of steel ingot, improve the temperature field and solute distribution,narrow the temperature gap of crystal- lication,and increase the nucleation frequency.Thus,the solidification time can be shorten, the solute can be well distributied,the shrinkage porosity can be reduced and the grain of crystallization can be fined. K EY WORDS suspension cating process;solidification kinetics;solidification rate;GCrl5 Steel