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State space optimization of finite state machines from the viewpoint of control theory Research Article
Jumei Yue, Yongyi Yan, Zengqiang Chen, He Deng,yjm@mail.nankai.edu.cn,yyyan@mail.nankai.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12, Pages 1551-1684 doi: 10.1631/FITEE.2000608
Keywords： 有限状态自动机；有限值系统；逻辑系统；逻辑网络；矩阵半张量积；空间优化
A matrix-based static approach to analysis of finite state machines Research Article
He DENG, Yongyi YAN, Zengqiang CHEN,yyyan@mail.nankai.edu.cn
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 8, Pages 1239-1246 doi: 10.1631/FITEE.2100561
Keywords： Logical systems Finite-valued systems Semi-tensor product of matrices Finite state machines Matrix approaches
Research of the Optimum SNR Thresholds of AQAM System Over Multi-path Rayleigh Channel
Gao Huanqin,Feng Guangzeng,Zhu Qi
Strategic Study of CAE 2006, Volume 8, Issue 1, Pages 67-71
Adaptive modulation techniques can improve the BER (bit error rate) performance or the average throughput by employing a suitable modulation mode depending on the instantaneous channel SNR (signal-to-noise ridio). In this paper the optimum SNR thresholds over a 6-path Rayleigh channel are derived, which shows a superior BPS (bit per symbol) throughput performance while maintaining the target average BER. The 6-path Rayleigh channel is often applied to mobile environment with high-speed. The results achieved in this paper can be applied to the adaptive modulation system with the channel of ITU-R M. 1225 Vehicular Test A mode.
Keywords： adaptive modulation AQAM optimum switching-level
Finite-time leader-follower consensus of a discrete-time system via sliding mode control Research Article
Ruizhuo SONG, Shi XING, Zhen XU
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 7, Pages 1057-1068 doi: 10.1631/FITEE.2100565
Keywords： Finite-time Leader-follower consensus Adaptive sliding mode control Multi-agent systems
Research on structural health monitoring (SHM) system based on RTK GPS system
Wang Renpeng,Yao Lianbi,Meng Xiaolin
Strategic Study of CAE 2011, Volume 13, Issue 3, Pages 63-70
For the huge amount of raw data that were obtained during field data acquisition by the real-time kinematic global positioning system (RTK GPS) in structural health monitoring (SHM) system of the Nanpu Bridge in Shanghai, we finished lots of processing works and obtain x-coordinate , y-coordinate,z-coordinate time series of all 12 monitoring station points. The coordinate time series were treated as the multi-outputs of the dynamic system and used to build the state space model and ARMA model and spectrum estimations for the response. The analysis results were consistent with the results of test that completed when the bridge was opened in 1990 and results that forecasted by fine finite element (FE) model. The research illustrated that the state-space model and ARMA model were efficient tools for evaluation of performance of civil structures, and furtherly proved the possibility of building the prototype SHM that based on RTK GPS.
Keywords： RTK GPS system time series state-space model ARMA model finite element model
Event-triggered adaptive finite-time control for nonlinear systems under asymmetric time-varying state constraints Research Article
Yan Wei, Jun Luo, Huaicheng Yan, Yueying Wang,wyy676@126.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12, Pages 1551-1684 doi: 10.1631/FITEE.2000692
Keywords： 事件触发控制；非线性映射；自适应模糊控制；有限时间；状态约束
Finite-time formation control for first-order multi-agent systems with region constraints Research Articles
Zhengquan Yang, Xiaofang Pan, Qing Zhang, Zengqiang Chen,zquanyang@163.com,1219006322@qq.com,qz120168@hotmail.com,chenzq@nankai.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 1, Pages 1-140 doi: 10.1631/FITEE.2000177
Keywords： Finite-time formation Multi-agent system Asymptotic convergence Set constraint Lyapunov theorem
Chen Mao,Lu Shi
Strategic Study of CAE 2013, Volume 15, Issue 4, Pages 57-61
This paper introduces the development of performance-based method (PBM) for seismic design and evaluation of nuclear safety related structure in nuclear power station in U. S., and systematically explains and discusses the PBM. Based on the updated research and available standards and codes, the main content of PBM includes following 5 aspects: Category of systems structures and components(SSC) according to different performance goal, Determination of performance goal of SSC, determination of seismic input based on PSHA, Fragility Analysis of SSC, and ensure sufficient conservatism of fragility safety to reasonably achieve target performance goal. This paper also gives some recommendations on the research and development of PBM in the future.
Keywords： nuclear power plant nuclear safety system structure and component performance-based seismic safety fragility
Research of fulldigital electricdriven system of new type hybrid electric vehicle
Sun Yukun,Zhang Haoming
Strategic Study of CAE 2009, Volume 11, Issue 4, Pages 57-62
Motor needs high efficiency, high power density and low pulsating torque in hybrid electric vehicle, traditional motors have their limits; Halbach motor is a novel permanent magnet (PM) motor: One-sided and sinusoidal field is produced by special distribution of permanent magnets. The field can increase air-gap flux while decrease rotor-yoke flux and air-gap harmonic, which can improve power density and efficiency, reduce volume and pulsating torque of motor. Halbach motor design software based on MATLAB and finite element analysis software based on ANYAS reduce period of motor design greatly. Full-digital electric-driven system of hybrid electric vehicle based on DSP2407A is designed according to Halbach motor's distinguishing feature.Experiment results prove Halbach motor has much more advantages in the system than traditional permanent magnet motor.
Keywords： hybrid electric vehicle electric-driven system Halbach array PM motor finite element analysis motor design
Presetting Method for Embodied Carbon Emission Limit of Building Structures
Xiao Jianzhuang, Xia Bing,Xiao Xuwen,Hu Xiaolong,Ding Tao,Zhou Ying,Zhu Hehua
Strategic Study of CAE 2023, Volume 25, Issue 2, Pages 187-197 doi: 10.15302/J-SSCAE-2023.02.016
The embodied carbon emission limit is a key parameter for quantitatively regulating carbon emissions from building structures and facilitating the achievement of carbon reduction targets. Starting from the social carbon emission reduction pathway toward carbon neutrality, a carbon emission reduction target decomposition approach is proposed based on the proportions of newly built and existing buildings in building structure retention and demand, which provides limit presetting references for existing structure maintenance and new structure design. Then, the expected development scenarios of building construction in China are established referring to the carbon peaking and neutrality goals in China, and correspondingly, the carbon emission limits for four typical scenarios, i. e., maintaining the status quo, conventional expectation, regulating demolition, and reduction expectation, are respectively evaluated to be 442.6 kg CO2e·m-2, 456.2 kg CO2e·m-2, 485.9 kg CO2e·m-2, and 616.0 kg CO2e·m-2 (the designed service life is 50 years). Besides, the expected trends of carbon emission limits during the year 2022 and 2060 have also been estimated, and the contributions of emission reduction measures, including the amount regulation of newly built structures and the lifespan extension of existing structures, to the relaxation of carbon emission limits for individual structures have been clarified. Furthermore, suggestions for research related to carbon emission limit are provided from the aspects of probabilistic regulation, quantification of regional characteristics, feasibility of the target achievement, and data-driven refinement.
Keywords： building structures embodied carbon emission limit carbon emission reduction target decomposition carbon peaking and neutrality low-carbon design
Yan Genhua,Gu Hua,Lu Zhongmin,Lin Yifeng
Strategic Study of CAE 2011, Volume 13, Issue 1, Pages 69-73
Based on the feature that offshore wind turbine tower supporting structures are affected by soil foundation and the ocean flow, the paper establishes 3D finite element numerical model to get dynamic characteristics of supporting system structure of different scour depths and discusses its change law in order to provide scientific basis for dynamic stability design of offshore wind turbine tower supporting structure.
Keywords： scour offshore wind farm supporting system dynamic characteristics 3D finite element
Slope Stability Analysis by Strength Reduction FEM
Zheng Yingren,Zhao Shangyi,Zhang Luyu
Strategic Study of CAE 2002, Volume 4, Issue 10, Pages 57-61
An analysis method for slope safety factor through c - cp reduction algorithm by finite elements is presented. When the system reaches instability, the numerical non-convergence occurs simultaneously. The safety factor is then obtained by c - ψ reduction algorithm. The same time, the critical failure surface is found automatically. The traditional limit equilibrium method can't get the safety factor and failure surface of jointed rock slope. Strength Reduction FEM (SRFEM) presents a powerful alternative approach for slope stability analysis, especially to jointed rock slope. This paper analyzes the precision and error caused by different soil yield criterions、FEM itself、slope height、slope angle´cohesion and friction angle thoroughly. Through a series of case studies, the results show average error of safety factor between Strength Reduction FEM and traditional limit equilibrium method (Bishop simplified method) is 3 %～8 %，the error between SRFEM and Spencer's method is 1 %～4 % . The applicability of the proposed method was clearly exhibited.
Keywords： slope stability analysis strength reduction by FEM yield criterions
Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory
Ying Fuqiang,Pan Xiaoyong,Li Min
Strategic Study of CAE 2007, Volume 9, Issue 7, Pages 47-52
Gear preforming by cross wedge rolling is an original question for discussion, parameters such as deformation, temperature field and mechanical performance are looking forward to be researched. This paper ties the advantages of preforming by CWR and the principle of generated gear together, and the die suited for gear rolling has been designed. Based on the finite deformation theory, the coupled thermal-mechanical constitutive model of gear rolling by CWR has been established. Then FEM simulation for the forming process has been developed in MSC. SuperForm, and information gained from the simulation has been analyzed also in detail which provide references for further study of gear rolling by CWR technology.
Keywords： cross wedge rolling(CWR) gear coupled thermo-mechanical FEM
Study on Finite Element Method for Calculation of Stress on External Ring of One-way Clutch
Luo Yixin,Wu Bo
Strategic Study of CAE 2004, Volume 6, Issue 9, Pages 56-59
At present there is no appropriate method for calculation of stress on external ring of a one-way clutch. In this paper, according to characteristics of the external ring, the method of finite element analyais has been used, the factors which have influence on computational accuracy have been studied, and the stress on external ring of a five roller-type one-way clutch has been calculated. Studies have shown that finite element analyais is really an attractive method for the calculation of stress on parts similar to external ring.
Keywords： clutch external ring stress finite element
Thermal Characteristics of the Main Spindle With Cooling System on the XK717 CNC Milling Machine
Wang Jinsheng,Hu Rufu,Wu Xiuhai
Strategic Study of CAE 2005, Volume 7, Issue 8, Pages 84-88
The main spindle system is a key part on the machine tools. The quality of thermal behavior influences the machining accuracy of machine tools directly. In this paper, thermal characteristics of spindle system on the XK717 CNC milling machine are analyzed by combining finite element method with cooling model between spindle system and water tank. Effect rule to thermal characteristics of the main spindle system are obtained. The cooling jacket on the main spindle is improved by the results. This research provides the theoretical fundamentals for optimization design of CNC milling machine.
Keywords： thermal characteristics finite element optimization design CNC milling machine
Title Author Date Type Operation
State space optimization of finite state machines from the viewpoint of control theory
Jumei Yue, Yongyi Yan, Zengqiang Chen, He Deng,yjm@mail.nankai.edu.cn,yyyan@mail.nankai.edu.cn
Journal Article
A matrix-based static approach to analysis of finite state machines
He DENG, Yongyi YAN, Zengqiang CHEN,yyyan@mail.nankai.edu.cn
Journal Article
Research of the Optimum SNR Thresholds of AQAM System Over Multi-path Rayleigh Channel
Gao Huanqin,Feng Guangzeng,Zhu Qi
Journal Article
Finite-time leader-follower consensus of a discrete-time system via sliding mode control
Ruizhuo SONG, Shi XING, Zhen XU
Journal Article
Research on structural health monitoring (SHM) system based on RTK GPS system
Wang Renpeng,Yao Lianbi,Meng Xiaolin
Journal Article
Event-triggered adaptive finite-time control for nonlinear systems under asymmetric time-varying state constraints
Yan Wei, Jun Luo, Huaicheng Yan, Yueying Wang,wyy676@126.com
Journal Article
Finite-time formation control for first-order multi-agent systems with region constraints
Zhengquan Yang, Xiaofang Pan, Qing Zhang, Zengqiang Chen,zquanyang@163.com,1219006322@qq.com,qz120168@hotmail.com,chenzq@nankai.edu.cn
Journal Article
Preliminary application study of performance-based method for seismic design and evaluation of nuclear safety related structure in nuclear power station
Chen Mao,Lu Shi
Journal Article
Research of fulldigital electricdriven system of new type hybrid electric vehicle
Sun Yukun,Zhang Haoming
Journal Article
Presetting Method for Embodied Carbon Emission Limit of Building Structures
Xiao Jianzhuang, Xia Bing,Xiao Xuwen,Hu Xiaolong,Ding Tao,Zhou Ying,Zhu Hehua
Journal Article
The influence analysis of foundation scouring on dynamic characteristics of the tower supporting system of offshore wind farm
Yan Genhua,Gu Hua,Lu Zhongmin,Lin Yifeng
Journal Article
Slope Stability Analysis by Strength Reduction FEM
Zheng Yingren,Zhao Shangyi,Zhang Luyu
Journal Article
Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory
Ying Fuqiang,Pan Xiaoyong,Li Min
Journal Article
Study on Finite Element Method for Calculation of Stress on External Ring of One-way Clutch
Luo Yixin,Wu Bo
Journal Article
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