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A stepless-power-reconfigurable converter for a constant current underwater observatory Research Article
Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12, Pages 1551-1684 doi: 10.1631/FITEE.2100259
Keywords: 恒流/恒压转换;并联稳压器;无级功率重构;水下观测网
Development of Marine Equipment for Underwater Stereoscopic Observation
Ma Rui, Zhao Xiutao, Liu Cungen
Strategic Study of CAE 2020, Volume 22, Issue 6, Pages 19-25 doi: 10.15302/J-SSCAE-2020.06.003
Establishing an underwater stereoscopic observation network to obtain scientific, real-time, and comprehensive data is an important direction for understanding and exploiting the ocean in the future. This study first analyzes the need and necessity of developing the underwater stereoscopic observation equipment, then introduces the development status of the equipment in China and abroad, further analyzes the problems faced by China’s field development, and presents the key breakthrough points of marine sensors which serve as the key link for underwater observation. China has made great progress in technologies regarding marine observation platforms, but it still lags behind the world advanced level in key marine sensors and high-precision sensors. The big data obtained from ocean observation does not match the actual demand, and the ocean sensors lack the support from an improved platform. To guide the long-term development of related fields, we suggest that China should support the efficient transformation of research results of key marine sensors, coordinate the management of the marine equipment for underwater stereoscopic observation, and establish a national public test platform for offshore instruments and equipment.
Keywords: ocean observation sea floor observatory network underwater vehicle underwater sensor
Power system design for constant current subsea observatories Regular Article
Yan-hu Chen, Sa Xiao, De-jun Li,yanhuchen@zju.edu.cn,sxiao@zju.edu.cn,li_dejun@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 11, Pages 1505-1515 doi: 10.1631/FITEE.1800362
Keywords: 海底观测网;电能变换;散热
A new approach for analyzing the effect of non-ideal power supply on a constant current underwater cabled system Personal View
Yu-jia ZANG, Yan-hu CHEN, Can-jun YANG, De-jun LI, Ze-jian CHEN, Gul MUHAMMAD
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 4, Pages 604-614 doi: 10.1631/FITEE.1800737
Keywords: Non-ideal power supply Constant current input Ocean observation system
Research Progress of Marine Scientific Equipment and Development Recommendations in China
Song Xiancang, Du Junfeng, Wang Shuqing, Li Huajun
Strategic Study of CAE 2020, Volume 22, Issue 6, Pages 76-83 doi: 10.15302/J-SSCAE-2020.06.010
Marine scientific equipment is an essential tool for better understanding oceans, and it is also the foundation for exploiting and protecting oceans. This study analyzes the urgent requirements for developing highly efficient marine scientific equipment in China from four aspects, including understanding oceans, exploring oceans, protecting oceans, and maintaining ocean rights and interests. In addition, it provides reviews on the state-of-the-art techniques associated with the marine scientific observation platforms, namely air–sea interface observation platform, mobile underwater observation platform, and seafloor observation network system, in the countries that are believed to lead the field, and the development trends associated therewith are then identified. The remarkable achievements obtained in marine scientific equipment in China are presented such as the marine remote-sensing satellites, marine research ships, deep-diving submersibles, and seafloor observation networks. By comparing to the international advanced level, the issues China encountered in the general technologies, core equipment, and integrated system of marine scientific equipment are given. Several key development suggestions associated with the marine scientific equipment development in China are provided in terms of basic theories and key technologies, novel equipment development and achievement conversion, sharing mechanism and service platform, as well as international cooperation and standard system establishment, enabling the marine scientific equipment to better serve the implementation of the national marine power strategy.
Keywords: marine scientific equipment deep-sea observation platform air–sea interface observation mobile underwater observation seafloor observation network equipment development
Mustafa GOKDAG,Mehmet AKBABA
Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 12, Pages 1388-1396 doi: 10.1631/FITEE.1500322
Keywords: Sub-module-level maximum power point tracking (MPPT) Differential power processing (DPP) Distributed power converters Switched-capacitor (SC) converters
Zhi-feng ZHANG, Yan-hu CHEN, De-jun LI, Bo JIN, Can-jun YANG, Jun WANG
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 11, Pages 1328-1339 doi: 10.1631/FITEE.1601843
Cabled seafloor observatories play an important role in ocean exploration for its long-term, real-time, and in-situ observation characteristics. In establishing a permanent, reliable, and robust seafloor observatory, a highly reliable cable switching and fault isolation method is essential. After reviewing the advantages and disadvantages of existing switching methods, we propose a novel active switching method for network configuration. Without additional communication path requirements, the switching method provides a way to communicate with a shore station through an existing power transmission path. A coded voltage signal with a distinct sequence is employed as the communication medium to transmit commands. The analysis of the maximum bit frequency of the voltage signals guarantees the accuracy of command recognition. A prototype based on the switching method is built and tested in a laboratory environment, which validated the functionality and reliability of the method.
Keywords: Cabled seafloor observatories Cable switching and fault isolation Coded voltage signal Maximum bit frequency
Controller area network node reliability assessment based on observable node information Article
Lei-ming ZHANG, Long-hao TANG, Yong LEI
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 5, Pages 615-626 doi: 10.1631/FITEE.1601029
Keywords: Controller area network (CAN) Transmit error counter (TEC) TEC value estimation Bayesian network Bus-off hitting time
Shi Suixiang,Li Zhanbin,Hua Yanning,Cheng Yiyuan and Liu Feng
Strategic Study of CAE 2016, Volume 18, Issue 2, Pages 61-65 doi: 10.15302/J-SSCAE-2016.02.007a
Promoting the creation of functional underwater observation information systems is an urgent priority for China’s national maritime defense, its ability to preserve its maritime rights, and marine disaster prevention and management. It is also an requirement of civil-military integration development to fulfill the overlapping missions of the Chinese military and civil government agencies. This paper reviews the current state of affairs and the ongoing trends in the field of underwater observation information systems in China and abroad. This study analyzes the problems faced by researchers and users in the development of underwater observation information system. The paper concludes by proposing a strategic goal, identifying the key projects and making policy recommendations for underwater observation information systems for stakeholders to consider.
Keywords: underwater observation information system key projects policy recommendations
Optimal communication frequency for switching cabled ocean networks with commands carried over the power line Research Article
Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10, Pages 1331-1343 doi: 10.1631/FITEE.1900125
Keywords: 海缆开断;海洋观测网;分支单元;传输线理论;通信频率
Research of an Interleaved Low-Voltage/High-Current DC-DC Converter
Wang Ping,Sun Xu,Song Liangyu
Strategic Study of CAE 2005, Volume 7, Issue 4, Pages 59-63
In the recent years, the operating voltages of most high-performance microprocessors were lower than that of the previous ones and the research of low-voltage/high-current DC-DC converter was enhanced. Among all topologies, the current-doublers topology is optional. In the current-doublers topology, the ripple current of the output filter capacitor is reduced because the ripple current of the two inductors partially cancel each other and the required value of the filter inductance is significantly decreased. To further decrease the ripple current of output filter capacitor, this paper introduce a new method that a few of current-doublers are interleaved. This paper gives the switch signal waveforms and simulation model of the circuit. PSpice is used, which is a simulation tool for electronic system. The result of simulation achieves the ideal effect. Finally, the design is tested by an experiment.
Keywords: low-voltage/high-current DC-DC converter current-doublers interleaved
Development and Experiment Research of the Postprocessor for Parallel Kinematic Machine Tools
Li Tiemin,Ye Peiqing,Wang Jinsong
Strategic Study of CAE 2003, Volume 5, Issue 12, Pages 80-86
Based on the structure of 6 - TPS parallel kinematic machine tools (PKMTs) with 6 degrees of freedom (DOF), the theory and procedure to generate control data is introduced. On the basis of above analysis, the functions and framework of a postprocessor for this type of machine tools is designed. Some important methods for carrying out the postprocessing of the machine are researched and demonstrated, including inner data transfer protocol by parameterized binary data, interpolating algorithm in Descartes coordinate system, planar and spatial tool radius compensation, preprocessing of cutter location data, and word and syntax check of machining codes. Finally, a real machining experiment on the system mentioned above is introduced. The result shows that it can be successfully used in real manufacturing environment.
Keywords: parallel kinematic machine tools postprocessing algorithm postprocessor
Status quo and outlook of reconfigurable research
Li Yufeng,Qiu Han,Lan Julong
Strategic Study of CAE 2008, Volume 10, Issue 7, Pages 82-89
Today, with new services and applications blooming on the internet, to enable traditional routers to offer enough capability and speed of upgrade along with these services and applications in time would become even harder than ever. Run-time reconfiguration (RTR), based on the Field Programmable Gate Array (FPGA), is a new promising technology that can configure the partial or total hardware logic resources of a system at run time. Based on the technology, reconfigurable routers can support dynamic reconfiguration of new hardware logic for the new service, while keeping the other services still run properly, hence can provide a new possible solution to the update problem of the traditional routers. After introducing the basic concepts of RTR and the current development of the FPGA, this paper summarizes the past major research efforts with respect to the reconfigurable router, as well as the current work on it. Research directions and open problems are also discussed from the point of view of reconfigurable network.
Keywords: internet reconfigurable router reconfigurable network programmable hardware
Study and Application of Steady Flow and Unsteady Flow Mathematical Model for Canal Networks
Zhang Mingliang,Shen Yongming
Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 92-96
Based on Preissmann implicit scheme for one-dimensional Saint-Venant Equation, the mathematical model for one- dimensional river networks and canal networks is developed and the key issues on the model are expatiated particularly in this paper. This model is applied to simulating the tree-type irrigation canal networks and complex looped canal networks. The results of levels and flows and discharge distribution between the branches agree with the data from Adlul. This model is a simple and practical tool for water resource regulation of irrigation canal networks and river networks. These results show the application value of this model is to set up ecological numerical model of water quality in river networks and canal networks.
Keywords: Preissmann implicit scheme canal networks and river networks discharge distribution water quality mode
Pattern reconfigurable antenna array for 5.8 GHz WBAN applications
杨凌升,王斌,李雅洁
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9, Pages 1357-1365 doi: 10.1631/FITEE.2200542
Title Author Date Type Operation
A stepless-power-reconfigurable converter for a constant current underwater observatory
Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn
Journal Article
Development of Marine Equipment for Underwater Stereoscopic Observation
Ma Rui, Zhao Xiutao, Liu Cungen
Journal Article
Power system design for constant current subsea observatories
Yan-hu Chen, Sa Xiao, De-jun Li,yanhuchen@zju.edu.cn,sxiao@zju.edu.cn,li_dejun@zju.edu.cn
Journal Article
A new approach for analyzing the effect of non-ideal power supply on a constant current underwater cabled system
Yu-jia ZANG, Yan-hu CHEN, Can-jun YANG, De-jun LI, Ze-jian CHEN, Gul MUHAMMAD
Journal Article
Research Progress of Marine Scientific Equipment and Development Recommendations in China
Song Xiancang, Du Junfeng, Wang Shuqing, Li Huajun
Journal Article
A novel PV sub-module-level power-balancing topology for maximum power point tracking under partial shading and mismatch conditions
Mustafa GOKDAG,Mehmet AKBABA
Journal Article
Use of a coded voltage signal for cable switching and fault isolation in cabled seafloor observatories
Zhi-feng ZHANG, Yan-hu CHEN, De-jun LI, Bo JIN, Can-jun YANG, Jun WANG
Journal Article
Controller area network node reliability assessment based on observable node information
Lei-ming ZHANG, Long-hao TANG, Yong LEI
Journal Article
Thoughts on the Designs, Applications, Trends, and Challenges of Underwater Observation Information Systems
Shi Suixiang,Li Zhanbin,Hua Yanning,Cheng Yiyuan and Liu Feng
Journal Article
Optimal communication frequency for switching cabled ocean networks with commands carried over the power line
Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn
Journal Article
Research of an Interleaved Low-Voltage/High-Current DC-DC Converter
Wang Ping,Sun Xu,Song Liangyu
Journal Article
Development and Experiment Research of the Postprocessor for Parallel Kinematic Machine Tools
Li Tiemin,Ye Peiqing,Wang Jinsong
Journal Article
Study and Application of Steady Flow and Unsteady Flow Mathematical Model for Canal Networks
Zhang Mingliang,Shen Yongming
Journal Article