Threshold decision is an important function of nuclear instrument control system based on physical parameters threshold decision. Because the conventional decision methods lack correlation with time and conditions, by...Threshold decision is an important function of nuclear instrument control system based on physical parameters threshold decision. Because the conventional decision methods lack correlation with time and conditions, by analyzing the existing methods, some optimized methods are adopted. Considering safety, those methods are improved in data processing algorithms, floating threshold with multiple values, association with specific working condition, etc. These measures im- prove the nuclear instrument control system in fault tolerance and fault diagnosis, especially, the shutdown number of nucle- ar power plant decreases.展开更多
Abstract In this paper, a cascade acceleration feedback control （AFC） enhanced by a disturbance observa- tion and compensation （DOC） method is proposed to improve the tracking precision of telescope systems. Teles...Abstract In this paper, a cascade acceleration feedback control （AFC） enhanced by a disturbance observa- tion and compensation （DOC） method is proposed to improve the tracking precision of telescope systems. Telescope systems usually suffer some uncertain disturbances, such as wind load, nonlinear friction and other unknown disturbances. To ensure tracking precision, an acceleration feedback loop which can in- crease the stiffness of such a system is introduced. Moreover, to further improve the tracking precision, we introduce the DOC method which can accurately estimate the disturbance and compensate it. Furthermore, the analysis of tracking accuracy used by this method is proposed. Finally, a few comparative experimental results show that the proposed control method has excellent performance for reducing the tracking error of a telescope system.展开更多
This paper proposes a dual-motor configuration to enhance closed-loop performance of a telescope control system. Two identical motors are mounted on each side of a U-type frame to drive the telescope elevation axis in...This paper proposes a dual-motor configuration to enhance closed-loop performance of a telescope control system. Two identical motors are mounted on each side of a U-type frame to drive the telescope elevation axis instead of a single motor drive, which is usually used in a classical design. This new configuration and mechanism can reduce the motor to half the size used in the former design, and it also provides some other advantages. A master-slave current control mode is employed to synchronize the two motors. Acceleration feedback control is utilized to further enhance the servo performance. Extensive experiments are used to validate the effectiveness of the proposed control algorithm in synchronization, disturbance attenuation and low-velocity tracking.展开更多
In this paper,the network reliability of an actual digital instrument and control system (DICS) network is analyzed by using GO-FLOW methodology (GFM).The evaluations of common-cause failure (CCF) and uncertainty are ...In this paper,the network reliability of an actual digital instrument and control system (DICS) network is analyzed by using GO-FLOW methodology (GFM).The evaluations of common-cause failure (CCF) and uncertainty are incorporated.Three significant CCF groups (real time servers,gateways,reactor protection system) and three typical time intervals (10 min,1 h,and 24 h) are selected in the analysis.It is concluded that the network contribution of CCF accounts for over 68% of the system failure probability.The result indicates that GFM is suitable for the network reliability analysis.展开更多
A general framework for observatory control software would help to improve the efficiency of observation and operation of telescopes, and would also be advantageous for remote and joint observations. We describe a gen...A general framework for observatory control software would help to improve the efficiency of observation and operation of telescopes, and would also be advantageous for remote and joint observations. We describe a general framework for observatory control software, which considers principles of flexibility and inheritance to meet the expectations from observers and technical personnel. This framework includes observation scheduling, device control and data storage. The design is based on a finite state machine that controls the whole process.展开更多
Chemical production has the characteristics of complexity, great difficulty, accurate technical requirements and high risk. The application of intelligent control technology and instrument control to chemical producti...Chemical production has the characteristics of complexity, great difficulty, accurate technical requirements and high risk. The application of intelligent control technology and instrument control to chemical production can reduce the demand for manual operation, improve the accuracy of chemical production and promote the benign operation of chemical operation. Therefore, the key technologies of intelligent control and instrument control should be deeply analyzed. In order to seek better chemical production technology and control scheme and promote the development of chemical industry.展开更多
In the process of improving social and economic system, our electrical automation technology has been widely used, and reflects different development role, to achieve more effective technology application, for electri...In the process of improving social and economic system, our electrical automation technology has been widely used, and reflects different development role, to achieve more effective technology application, for electrical automation development mode and industry development demand, based on this, this paper mainly based on the electrical automation instrument control technology.展开更多
The NPP （nuclear power plant） being vital objects of an energy infrastructure must be protected against malicious actions affecting their safety, and cyber security plays a key part in attaining this goal. The paper...The NPP （nuclear power plant） being vital objects of an energy infrastructure must be protected against malicious actions affecting their safety, and cyber security plays a key part in attaining this goal. The paper considers, implemented by the authors within the project of advanced digital control system for NPP with the reactor VVER-1000, a system of unauthorized access protection, partially built up on the technology of AA （active audit） and expert system. The AA technology is based on response of the system on deviation of current signature of the automated process control system from stable state rather than on a certain signature of attack and relies on the estimation of the behavioral models of the particular digital control system. The advent of active audit reflects the current situation in the digital control systems where complex distributed platforms are used to construct automated process control system. The active audit allows one to make the digital control system functionally closed, provided that it is determinate. The methodology of the active audit does not give u external （barrier） and traditional （password, antivirus） methods of unauthorized access protection. These methods can be used when it is appropriate to achieve a required protection level.展开更多
A review on thermal power plant automation development in China over 50 years is presented. The level of thermal power automation is introduced, especially for 200 MW and above units which are clarified into three cat...A review on thermal power plant automation development in China over 50 years is presented. The level of thermal power automation is introduced, especially for 200 MW and above units which are clarified into three categories by grade. The conditions, existing problems, relevant solutions and policies are summarized chronologically in aspects of centralized control, automatic regulation and controllability of main and auxiliary units, turbine control system, furnace security protection, and computer application in thermal power plants. This paper also points out the development tendency of thermal power plant automation and concepts of some vocabularies.展开更多
Introduction.Pluralistic religions have been an important part of the history of Southeast Asia from the pre-modern to the modern period.They have permeated every aspect of the daily lives of ordinary people and have ...Introduction.Pluralistic religions have been an important part of the history of Southeast Asia from the pre-modern to the modern period.They have permeated every aspect of the daily lives of ordinary people and have been utilized as instruments of control by regional rulers to strengthen their grip on social stability and consolidate their power.A parallel can be drawn with Europe during the pre-modern period,where religious power and royal power were in constant confrontation.At times,religious authority even surpassed the control of royal power.展开更多
In cerebrovascular interventional surgery,spatial position prediction navigation(SPPN)provides 3D spatial information of the vascular lumen,reducing the spatial dimension loss from digital subtraction angiography(DSA)...In cerebrovascular interventional surgery,spatial position prediction navigation(SPPN)provides 3D spatial information of the vascular lumen,reducing the spatial dimension loss from digital subtraction angiography(DSA)and improving surgical precision.However,it is limited in its adaptability to complex vascular environments and prone to error accumulation.To address these issues,we propose spatial position prediction-based multimodal navigation(SPPMN),integrating minimal intraoperative X-ray images to enhance SPPN accuracy.In the first phase,a feature-weighted dynamic time warping(FDTW)-based branch matching algorithm is introduced for 3D topological positioning under non-registered conditions,with a dynamic location repositioning module for real-time corrections.In the second phase,an occlusion correction module,based on the elastic potential energy of the instrument tip,dynamically adjusts the tip's angle to achieve low-projection occlusion control.Experimental validation using a high-precision electromagnetic tracking system(EMTS)on a 3D vascular model shows that the proposed method achieves an average 3D positioning accuracy of 9.36 mm in intracranial vascular regions,with a 78%reduction in radiation exposure,significantly enhancing both precision and safety in interventional surgeries.展开更多
基金Research Project of Hunan Province Education Department(No.14C0972)
文摘Threshold decision is an important function of nuclear instrument control system based on physical parameters threshold decision. Because the conventional decision methods lack correlation with time and conditions, by analyzing the existing methods, some optimized methods are adopted. Considering safety, those methods are improved in data processing algorithms, floating threshold with multiple values, association with specific working condition, etc. These measures im- prove the nuclear instrument control system in fault tolerance and fault diagnosis, especially, the shutdown number of nucle- ar power plant decreases.
基金supported by the Quantum Communication Project,one of the Strategic Pilot Projects,Chinese Academy of Sciences
文摘Abstract In this paper, a cascade acceleration feedback control （AFC） enhanced by a disturbance observa- tion and compensation （DOC） method is proposed to improve the tracking precision of telescope systems. Telescope systems usually suffer some uncertain disturbances, such as wind load, nonlinear friction and other unknown disturbances. To ensure tracking precision, an acceleration feedback loop which can in- crease the stiffness of such a system is introduced. Moreover, to further improve the tracking precision, we introduce the DOC method which can accurately estimate the disturbance and compensate it. Furthermore, the analysis of tracking accuracy used by this method is proposed. Finally, a few comparative experimental results show that the proposed control method has excellent performance for reducing the tracking error of a telescope system.
文摘This paper proposes a dual-motor configuration to enhance closed-loop performance of a telescope control system. Two identical motors are mounted on each side of a U-type frame to drive the telescope elevation axis instead of a single motor drive, which is usually used in a classical design. This new configuration and mechanism can reduce the motor to half the size used in the former design, and it also provides some other advantages. A master-slave current control mode is employed to synchronize the two motors. Acceleration feedback control is utilized to further enhance the servo performance. Extensive experiments are used to validate the effectiveness of the proposed control algorithm in synchronization, disturbance attenuation and low-velocity tracking.
基金Supported by Nuclear Safety Research Association and Tohoku University for Nuclear Researchers Exchange Program 2010National High Technology and Development Program ("863"Program)of China(No.2007AA041009)
文摘In this paper,the network reliability of an actual digital instrument and control system (DICS) network is analyzed by using GO-FLOW methodology (GFM).The evaluations of common-cause failure (CCF) and uncertainty are incorporated.Three significant CCF groups (real time servers,gateways,reactor protection system) and three typical time intervals (10 min,1 h,and 24 h) are selected in the analysis.It is concluded that the network contribution of CCF accounts for over 68% of the system failure probability.The result indicates that GFM is suitable for the network reliability analysis.
文摘A general framework for observatory control software would help to improve the efficiency of observation and operation of telescopes, and would also be advantageous for remote and joint observations. We describe a general framework for observatory control software, which considers principles of flexibility and inheritance to meet the expectations from observers and technical personnel. This framework includes observation scheduling, device control and data storage. The design is based on a finite state machine that controls the whole process.
文摘Chemical production has the characteristics of complexity, great difficulty, accurate technical requirements and high risk. The application of intelligent control technology and instrument control to chemical production can reduce the demand for manual operation, improve the accuracy of chemical production and promote the benign operation of chemical operation. Therefore, the key technologies of intelligent control and instrument control should be deeply analyzed. In order to seek better chemical production technology and control scheme and promote the development of chemical industry.
文摘In the process of improving social and economic system, our electrical automation technology has been widely used, and reflects different development role, to achieve more effective technology application, for electrical automation development mode and industry development demand, based on this, this paper mainly based on the electrical automation instrument control technology.
文摘The NPP （nuclear power plant） being vital objects of an energy infrastructure must be protected against malicious actions affecting their safety, and cyber security plays a key part in attaining this goal. The paper considers, implemented by the authors within the project of advanced digital control system for NPP with the reactor VVER-1000, a system of unauthorized access protection, partially built up on the technology of AA （active audit） and expert system. The AA technology is based on response of the system on deviation of current signature of the automated process control system from stable state rather than on a certain signature of attack and relies on the estimation of the behavioral models of the particular digital control system. The advent of active audit reflects the current situation in the digital control systems where complex distributed platforms are used to construct automated process control system. The active audit allows one to make the digital control system functionally closed, provided that it is determinate. The methodology of the active audit does not give u external （barrier） and traditional （password, antivirus） methods of unauthorized access protection. These methods can be used when it is appropriate to achieve a required protection level.
文摘A review on thermal power plant automation development in China over 50 years is presented. The level of thermal power automation is introduced, especially for 200 MW and above units which are clarified into three categories by grade. The conditions, existing problems, relevant solutions and policies are summarized chronologically in aspects of centralized control, automatic regulation and controllability of main and auxiliary units, turbine control system, furnace security protection, and computer application in thermal power plants. This paper also points out the development tendency of thermal power plant automation and concepts of some vocabularies.
文摘Introduction.Pluralistic religions have been an important part of the history of Southeast Asia from the pre-modern to the modern period.They have permeated every aspect of the daily lives of ordinary people and have been utilized as instruments of control by regional rulers to strengthen their grip on social stability and consolidate their power.A parallel can be drawn with Europe during the pre-modern period,where religious power and royal power were in constant confrontation.At times,religious authority even surpassed the control of royal power.
基金supported in part by the National Key Research and Development Program of China(2024YFF1206902)in part by the National Natural Science Foundation of China(62303463)+1 种基金in part by the Beijing Natural Science Foundation,China(L232137,L246047)in part by the National High Level Hospital Clinical Research Funding(2022-PUMCH-B-125).
文摘In cerebrovascular interventional surgery,spatial position prediction navigation(SPPN)provides 3D spatial information of the vascular lumen,reducing the spatial dimension loss from digital subtraction angiography(DSA)and improving surgical precision.However,it is limited in its adaptability to complex vascular environments and prone to error accumulation.To address these issues,we propose spatial position prediction-based multimodal navigation(SPPMN),integrating minimal intraoperative X-ray images to enhance SPPN accuracy.In the first phase,a feature-weighted dynamic time warping(FDTW)-based branch matching algorithm is introduced for 3D topological positioning under non-registered conditions,with a dynamic location repositioning module for real-time corrections.In the second phase,an occlusion correction module,based on the elastic potential energy of the instrument tip,dynamically adjusts the tip's angle to achieve low-projection occlusion control.Experimental validation using a high-precision electromagnetic tracking system(EMTS)on a 3D vascular model shows that the proposed method achieves an average 3D positioning accuracy of 9.36 mm in intracranial vascular regions,with a 78%reduction in radiation exposure,significantly enhancing both precision and safety in interventional surgeries.
