,1040 北京科技大学学报 第29卷 curacy in thickness during flying gauge change in tandem cold [8]Mori Y.IshibashiT,Washikita Y,et al.Modernization of gauge mill.Rev Metall.1998.95(4):911 control system at Sumitomo Wakayama 5-stand cold mill.Iron [4们王军生，赵启林，矫志杰，等。冷连轧动态变规格辊缝动态设 Steel Eng-1999(8):46 定原理与应用.钢铁，2001,36(10)：39 [9]郑申白，韩静涛，赵中里，等.变规格连轧时的速度与秒流量 [5]贺毓辛，郭惠久，杨杰，冷连轧机的动态变规格过程的计算机 相等法则.北京科技大学学报，2003,25(6)：556 仿真.北京钢铁学院学报，1982(1)：51 [10]Gumi K.Abiko Y,Yamamoto S.New gauge control system for []王修岩，葛平，孙一康，等.基于多模型自适应控制方法的 tandem cold mill.Iron Steel Eng.1994(12):42 FGC控制.北京科技大学学报，2004,26(1)：99 [11]Shimoda N.Okamoto K.Wan HL,et al.Process control tech- [7]Bilkhu TS.Dynamic control of tension.thickness and flatness for nology for thin strip production in Tangshan.China.Iron Steel a tandem cold mill.AISE Steel Technol,2001,78(10):49 Technol,2005(1):33 Speed control strategy and rule of the FGC stand in a tandem cold rolling mill ZHOU Fuqiang,CAO Jianguo),ZHANG Jie),WANG Cong2),ZENG Wei2),PENG Qiang2) 1)Mechanical Engineering School.University of Science and Technology Beijing,Beijing 100083.China 2)Cold Rolling Mill.Wuhan Iron and Steel (Group)Corp..Wuhan 430083.China ABSTRACI According to flying gauge change (FGC)characteristics of a tandem cold rolling mill (TCM),a speed control strategy of the FGC stand with the strip tension set point before FGC as a control target was put forward.Based on the developed analytic mathematic models of strip elastic deformation under tension between stands,the speed control rule of the FGC stand was derived under the condition of small gauge change by single step,and the speed of the other stands having finished the FGC process was calculated based on the constant mass flow principle.When the dimensions or material properties of two kinds of strips varied great,the method using wedge was also took to carry out FGC,and the control rules of rolling speed and gauge set point for every thickness of the wedge were derived and calculated by using the developed strategy.The deviations of strip thickness produced by FGC were limited in the stands before and behind the FGC point,and the interference of the FGC stand to the others was eliminated,then the process control for FGC could be implemented easier. KEY WORDS tandem cold rolling mill:strip:flying gauge control:mathematical models;control strategy (上接第1032页) Effect of temperature on phonon amplification in a single walled nanotube FENG Peng12),YI Taimin) 1)Applied Science School.University of Science and Technology Beijing.Beijing 100083.China 2)China Center of Advanced Science and Technology,Beijing 100080.China ABSTRACI The phonon amplification effect occurring in a single walled nanotube was discussed,and the change rates of phonon population at different temperatures were calculated by using a time dependent perturba- tion method.It is shown that the optical phonon population increases nonlinearly with increasing laser field and the rate decreases as the temperature increases.At a definite temperature,the more intense the laser field is,the more remarkable the phonon amplification effect is,and a reasonable interpretation on this phenomenon was pre- sented. KEY WORDS single walled nanotube:phonon;amplification;phonon populationcuracy in thickness during flying gauge change in tandem cold mill．Rev Metall‚1998‚95（4）：911 ［4］ 王军生‚赵启林‚矫志杰‚等．冷连轧动态变规格辊缝动态设 定原理与应用．钢铁‚2001‚36（10）：39 ［5］ 贺毓辛‚郭惠久‚杨杰．冷连轧机的动态变规格过程的计算机 仿真．北京钢铁学院学报‚1982（1）：51 ［6］ 王修岩‚葛平‚孙一康‚等．基于多模型自适应控制方法的 FGC 控制．北京科技大学学报‚2004‚26（1）：99 ［7］ Bilkhu T S．Dynamic control of tension‚thickness and flatness for a tandem cold mill．AISE Steel Technol‚2001‚78（10）：49 ［8］ Mori Y‚Ishibashi T‚Washikita Y‚et al．Modernization of gauge control system at Sumitomo Wakayama 5-stand cold mill．Iron Steel Eng‚1999（8）：46 ［9］ 郑申白‚韩静涛‚赵中里‚等．变规格连轧时的速度与秒流量 相等法则．北京科技大学学报‚2003‚25（6）：556 ［10］ Gumi K‚Abiko Y‚Yamamoto S．New gauge control system for tandem cold mill．Iron Steel Eng‚1994（12）：42 ［11］ Shimoda N‚Okamoto K‚Wan H L‚et al．Process control tech￾nology for thin strip production in Tangshan‚China．Iron Steel Technol‚2005（1）：33 Speed control strategy and rule of the FGC stand in a tandem cold rolling mill ZHOU Fuqiang 1）‚CAO Jianguo 1）‚ZHA NG Jie 1）‚WA NG Cong 2）‚ZENG Wei 2）‚PENG Qiang 2） 1）Mechanical Engineering School‚University of Science and Technology Beijing‚Beijing100083‚China 2） Cold Rolling Mill‚Wuhan Iron and Steel （Group） Corp．‚Wuhan430083‚China ABSTRACT According to flying gauge change （FGC） characteristics of a tandem cold rolling mill （TCM）‚a speed control strategy of the FGC stand with the strip tension set-point before FGC as a control target was put forward．Based on the developed analytic mathematic models of strip elastic deformation under tension between stands‚the speed control rule of the FGC stand was derived under the condition of small gauge change by single step‚and the speed of the other stands having finished the FGC process was calculated based on the constant mass flow principle．When the dimensions or material properties of two kinds of strips varied great‚the method using wedge was also took to carry out FGC‚and the control rules of rolling speed and gauge set-point for every thickness of the wedge were derived and calculated by using the developed strategy．The deviations of strip thickness produced by FGC were limited in the stands before and behind the FGC point‚and the interference of the FGC stand to the others was eliminated‚then the process control for FGC could be implemented easier． KEY WORDS tandem cold rolling mill；strip；flying gauge control；mathematical models；control strategy （上接第1032页） Effect of temperature on phonon amplification in a single-walled nanotube FENG Peng 1‚2）‚Y I T aimin 1） 1） Applied Science School‚University of Science and Technology Beijing‚Beijing100083‚China 2） China Center of Advanced Science and Technology‚Beijing100080‚China ABSTRACT The phonon amplification effect occurring in a single-walled nanotube was discussed‚and the change rates of phonon population at different temperatures were calculated by using a time-dependent-perturba￾tion method．It is shown that the optical phonon population increases nonlinearly with increasing laser field and the rate decreases as the temperature increases．At a definite temperature‚the more intense the laser field is‚the more remarkable the phonon amplification effect is‚and a reasonable interpretation on this phenomenon was pre￾sented． KEY WORDS single-walled nanotube；phonon；amplification；phonon population ·1040· 北 京 科 技 大 学 学 报 第29卷