Both the traverse subsystem and the elevation subsystem of the all-electrical tank gun control system are composed of electrical drive control system respectively. The parameters of PI regulator in these electrical dr...Both the traverse subsystem and the elevation subsystem of the all-electrical tank gun control system are composed of electrical drive control system respectively. The parameters of PI regulator in these electrical drive control systems affect the performance of the control system seriously. Up to now, there is not a simple and practical method for choosing regulator parameters, which are usually determined by repeated and continual readjustment. This method is low efficient, and the parameters got are not always optimal. A method for on-line adjusting the parameters of PI regulator in the electrical drive control system by computer program is introduced in this paper. The function of adjusting PI parameters of the electrical drive control system is realized by PC program written by VC++ and controlling program written by assemble language and by the communication between PC and DSP completed by the control MSCOMM in VC++6.0. The method as mentioned above which is applied for an all-electrical tank gun control system under development is proved very available, a better performance might be obtained for the all-electrical tank gun control system easily.展开更多
今年五月十四日,是母亲节。这一天,美国沸腾了！尤其是首都华盛顿,百万妈妈走出家庭,外出集会游行。Million Mom March(注意头韵)罕见且壮观的场面被本文活龙活现地刻画出来。母亲节,本应是子女给母亲赠贺卡、送鲜花、并好好“款待”母...今年五月十四日,是母亲节。这一天,美国沸腾了！尤其是首都华盛顿,百万妈妈走出家庭,外出集会游行。Million Mom March(注意头韵)罕见且壮观的场面被本文活龙活现地刻画出来。母亲节,本应是子女给母亲赠贺卡、送鲜花、并好好“款待”母亲的日子。可是,今年的母亲节,美国成千上万的母亲再也无法在家中坐享那份悠闲。她们从全国各地来到了首都华盛顿,举行活动、参加游行,向政府请愿: Children are Not Bullet Proof！ Guns Don’t Die,People Do！ 百万妈妈的游行队伍浩浩荡荡,巍为壮观。然而,此刻也会冒出与之不协调 的声音: Gun control increases violent crime by shifting the balance of power from thelaw-abiding(守法的)to the criminal. 此句的大意是:控制枪支只会使暴力犯罪增加,因为平衡将被打破,犯罪分子将拿到更多比例的枪支,而守法者却拿到更少。 有的言辞更加激烈: You will never disarm the American people.This is not Nazi Germany. 本文还透露了一个美国官方发布的信息,令人震惊: According to the Centers for Disease Control and Prevention,more than 32,000 people die from gun-related accidents,suicides and murders each year in theUnited States.Of those,more than 4,展开更多
Dear Rosemary, I am a college teacher of physics in Hangzhou, a beautifu1 lake city nearShanghai. I have been a faithful reader of EST Learning for more than 10 years. Thepast two years witnessed great changes in ESTL...Dear Rosemary, I am a college teacher of physics in Hangzhou, a beautifu1 lake city nearShanghai. I have been a faithful reader of EST Learning for more than 10 years. Thepast two years witnessed great changes in ESTL, and we are glad to read your essays.Your column has served as a window to us readers, through which we can know moreabout the outside world, especially the States.展开更多
Achieving high hitting accuracy for a main battle tank is challenging while the tank is on the move. This can be reached by proper design of a weapon control and gun system. In order to design an effective gun system ...Achieving high hitting accuracy for a main battle tank is challenging while the tank is on the move. This can be reached by proper design of a weapon control and gun system. In order to design an effective gun system while the tank is moving, better understanding of the dynamic behavior of the gun system is required. In this study, the dynamic behaviour of a gun system is discussed in this respect. Both experimental and numerical applications for the determination of the dynamic behaviour of a tank gun system are investigated. Methods such as the use of muzzle reference system(MRS) and vibration absorbers, and active vibration control technology for the control and the reduction of the muzzle tip deflections are also reviewed. For the existing gun systems without making substantial modifications,MRS could be useful in controlling the deflections of gun barrels with estimation/prediction algorithms.The vibration levels could be cut into half by the use of optimised vibration absorbers for an existing gun.A new gun system with a longer barrel can be as accurate as the one with a short barrel with the appropriate structural modifications.展开更多
Hunan Weather Modification Center and Suizhou Dafang Precision Electromechanical Engineering Co.,Ltd. of Hubei commonly transformed and installed 83 double tube antiaircraft guns( 37 mm) of Hunan Province in order to ...Hunan Weather Modification Center and Suizhou Dafang Precision Electromechanical Engineering Co.,Ltd. of Hubei commonly transformed and installed 83 double tube antiaircraft guns( 37 mm) of Hunan Province in order to realize remote control of computer. After transformation,loading capacity of ammunition feeding machine became large,which could shorten the time of filling shells in the case of short airspace time;one shell launch volume was more,which could improve hail suppression effect; the degree of automation was greatly improved,which could save manpower by more than 50%. It fully embodied the modernization level of Hunan weather modification operation.展开更多
In this paper, Takagi-Sugeno(T-S) fuzzy control is proposed for stabilizing the output beam of accelerators. To model the nonlinear system, we proposed a hybrid optimization algorithm based on quantum-inspired differe...In this paper, Takagi-Sugeno(T-S) fuzzy control is proposed for stabilizing the output beam of accelerators. To model the nonlinear system, we proposed a hybrid optimization algorithm based on quantum-inspired differential evolution and genetic algorithm. Based on the T-S model identified, the corresponding statefeedback fuzzy controller is designed. The method is applied to the La B6 electron gun system in the industrial radiation accelerator and the simulation results show its effectiveness.展开更多
Very high frequency(VHF) photocathode guns have excellent performance and are being increasingly selected as electron sources for high-repetition-rate X-ray free-electron lasers. As a highly loaded quality factor cavi...Very high frequency(VHF) photocathode guns have excellent performance and are being increasingly selected as electron sources for high-repetition-rate X-ray free-electron lasers. As a highly loaded quality factor cavity, the VHF gun requires high stability in the amplitude and phase of the cavity field. However, the gun is microwave powered by two solid-state power sources through two separate power couplers. The input difference between the two power couplers will influence the stability of the cavity field. To systematically study this influence and obtain measurement formulae, a multi-port VHF gun LCR circuit model is built and analyzed. During the warm-up condition, the cavity structure will be deformed due to the large-scale change in the cavity temperature. Then, the deformation will result in cavity resonant frequency changes. To prevent the mechanic tuner from suffering damages due to the frequent and long-distance movement for correcting the cavity resonant frequency, a self-excited loop(SEL) control system is considered for changing the loop phase and make the loop frequency follow the resonant frequency. In this study, a steady-state model of the VHF gun cavity is built for obtaining the optimal input coupler coefficient and the stability requirement of the forward voltage. Then, the generator-driven resonator and SEL control system, which combine with the VHF multiport modeling, are modeled and simulated. The simulated results show that the SEL system can perfectly operate in the process of condition and warm-up.展开更多
文摘Both the traverse subsystem and the elevation subsystem of the all-electrical tank gun control system are composed of electrical drive control system respectively. The parameters of PI regulator in these electrical drive control systems affect the performance of the control system seriously. Up to now, there is not a simple and practical method for choosing regulator parameters, which are usually determined by repeated and continual readjustment. This method is low efficient, and the parameters got are not always optimal. A method for on-line adjusting the parameters of PI regulator in the electrical drive control system by computer program is introduced in this paper. The function of adjusting PI parameters of the electrical drive control system is realized by PC program written by VC++ and controlling program written by assemble language and by the communication between PC and DSP completed by the control MSCOMM in VC++6.0. The method as mentioned above which is applied for an all-electrical tank gun control system under development is proved very available, a better performance might be obtained for the all-electrical tank gun control system easily.
文摘今年五月十四日,是母亲节。这一天,美国沸腾了！尤其是首都华盛顿,百万妈妈走出家庭,外出集会游行。Million Mom March(注意头韵)罕见且壮观的场面被本文活龙活现地刻画出来。母亲节,本应是子女给母亲赠贺卡、送鲜花、并好好“款待”母亲的日子。可是,今年的母亲节,美国成千上万的母亲再也无法在家中坐享那份悠闲。她们从全国各地来到了首都华盛顿,举行活动、参加游行,向政府请愿: Children are Not Bullet Proof！ Guns Don’t Die,People Do！ 百万妈妈的游行队伍浩浩荡荡,巍为壮观。然而,此刻也会冒出与之不协调 的声音: Gun control increases violent crime by shifting the balance of power from thelaw-abiding(守法的)to the criminal. 此句的大意是:控制枪支只会使暴力犯罪增加,因为平衡将被打破,犯罪分子将拿到更多比例的枪支,而守法者却拿到更少。 有的言辞更加激烈: You will never disarm the American people.This is not Nazi Germany. 本文还透露了一个美国官方发布的信息,令人震惊: According to the Centers for Disease Control and Prevention,more than 32,000 people die from gun-related accidents,suicides and murders each year in theUnited States.Of those,more than 4,
文摘Dear Rosemary, I am a college teacher of physics in Hangzhou, a beautifu1 lake city nearShanghai. I have been a faithful reader of EST Learning for more than 10 years. Thepast two years witnessed great changes in ESTL, and we are glad to read your essays.Your column has served as a window to us readers, through which we can know moreabout the outside world, especially the States.
文摘Achieving high hitting accuracy for a main battle tank is challenging while the tank is on the move. This can be reached by proper design of a weapon control and gun system. In order to design an effective gun system while the tank is moving, better understanding of the dynamic behavior of the gun system is required. In this study, the dynamic behaviour of a gun system is discussed in this respect. Both experimental and numerical applications for the determination of the dynamic behaviour of a tank gun system are investigated. Methods such as the use of muzzle reference system(MRS) and vibration absorbers, and active vibration control technology for the control and the reduction of the muzzle tip deflections are also reviewed. For the existing gun systems without making substantial modifications,MRS could be useful in controlling the deflections of gun barrels with estimation/prediction algorithms.The vibration levels could be cut into half by the use of optimised vibration absorbers for an existing gun.A new gun system with a longer barrel can be as accurate as the one with a short barrel with the appropriate structural modifications.
基金Supported by Topic of the Diagnostic Analysis of Spring Hail Suppression Operation Condition in Hunan
文摘Hunan Weather Modification Center and Suizhou Dafang Precision Electromechanical Engineering Co.,Ltd. of Hubei commonly transformed and installed 83 double tube antiaircraft guns( 37 mm) of Hunan Province in order to realize remote control of computer. After transformation,loading capacity of ammunition feeding machine became large,which could shorten the time of filling shells in the case of short airspace time;one shell launch volume was more,which could improve hail suppression effect; the degree of automation was greatly improved,which could save manpower by more than 50%. It fully embodied the modernization level of Hunan weather modification operation.
基金Supported by the Knowledge Innovation Program of Chinese Academy of Sciences(No.Y35501A011)
文摘In this paper, Takagi-Sugeno(T-S) fuzzy control is proposed for stabilizing the output beam of accelerators. To model the nonlinear system, we proposed a hybrid optimization algorithm based on quantum-inspired differential evolution and genetic algorithm. Based on the T-S model identified, the corresponding statefeedback fuzzy controller is designed. The method is applied to the La B6 electron gun system in the industrial radiation accelerator and the simulation results show its effectiveness.
文摘Very high frequency(VHF) photocathode guns have excellent performance and are being increasingly selected as electron sources for high-repetition-rate X-ray free-electron lasers. As a highly loaded quality factor cavity, the VHF gun requires high stability in the amplitude and phase of the cavity field. However, the gun is microwave powered by two solid-state power sources through two separate power couplers. The input difference between the two power couplers will influence the stability of the cavity field. To systematically study this influence and obtain measurement formulae, a multi-port VHF gun LCR circuit model is built and analyzed. During the warm-up condition, the cavity structure will be deformed due to the large-scale change in the cavity temperature. Then, the deformation will result in cavity resonant frequency changes. To prevent the mechanic tuner from suffering damages due to the frequent and long-distance movement for correcting the cavity resonant frequency, a self-excited loop(SEL) control system is considered for changing the loop phase and make the loop frequency follow the resonant frequency. In this study, a steady-state model of the VHF gun cavity is built for obtaining the optimal input coupler coefficient and the stability requirement of the forward voltage. Then, the generator-driven resonator and SEL control system, which combine with the VHF multiport modeling, are modeled and simulated. The simulated results show that the SEL system can perfectly operate in the process of condition and warm-up.
