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Adaptive tracking control of high-order MIMO nonlinear systems with prescribed performance Research Articles
Xuerao Wang, Qingling Wang, Changyin Sun,wangxuerao@seu.edu.cn,qlwang@seu.edu.cn,cysun@seu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 7, Pages 986-1001 doi: 10.1631/FITEE.2000145
Keywords： 自适应跟踪控制；预设性能；输入饱和；干扰观测器；神经网络
Zi-quan YU, Zhi-xiang LIU, You-min ZHANG, Yao-hong QU, Chun-yi SU
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5, Pages 685-700 doi: 10.1631/FITEE.1800569
In this paper, a decentralized fault-tolerant cooperative control scheme is developed for multiple unmanned aerial vehicles (UAVs) in the presence of actuator faults and a directed communication network. To counteract in-flight actuator faults and enhance formation flight safety, neural networks (NNs) are used to approximate unknown nonlinear terms due to the inherent nonlinearities in UAV models and the actuator loss of control effectiveness faults. To further compensate for NN approximation errors and actuator bias faults, the disturbance observer (DO) technique is incorporated into the control scheme to increase the composite approximation capability. Moreover, the prediction errors, which represent the approximation qualities of the states induced by NNs and DOs to the measured states, are integrated into the developed fault-tolerant cooperative control scheme. Furthermore, prescribed performance functions are imposed on the attitude synchronization tracking errors, to guarantee the prescribed synchronization tracking performance. One of the key features of the proposed strategy is that unknown terms due to the inherent nonlinearities in UAVs and actuator faults are compensated for by the composite approximators constructed by NNs, DOs, and prediction errors. Another key feature is that the attitude synchronization tracking errors are strictly constrained within the prescribed bounds. Finally, simulation results are provided and have demonstrated the effectiveness of the proposed control scheme.
Keywords： Fault-tolerant control Decentralized control Prescribed performance Unmanned aerial vehicle Neural network Disturbance observer Directed topology
Guo Dongming
Strategic Study of CAE 2011, Volume 13, Issue 10, Pages 47-57
With the expansion of high-end equipments and products, performance tolerance standard of some equipments and products becomes more and more high. In this case, a large number of high performance parts come into being. The machining of these key parts has changed from pure geometric accuracy requirements to performance-geometry integrated precision machining requirements under the premise of taking performance requirements as a primary target. Such high performance parts often have complex surfaces and ultra-high machining accuracy, and consequently use difficult-to-cut materials with supper-hard, supper-brittle or supper-sticky characteristics. Due to the case that the part performance has complex coupled effect with many factors such as part geometry and material, it is rather difficult to manufacture with a high precision when using traditional machining processes, which often lead to high rejection rate, low machining efficiency and particularly out-of-tolerance part performance. For satisfying the requirement of manufacturing industry, a new digital machining way for high performance key parts is presented in this paper. The characteristics and classified system of high performance key parts are described. Then reasons of high product rejection rate using experiential method and connotations of positive digital machining of complex surfaces are subsequently expounded. Key issues and their research statuses, existing problems and solving measures of positive machining technologies are finally discussed in detail. It provides an effective reference and guidance for the establishment of performance-geometry integrated machining principle, method and process technologies, and then as a result to solve the issue of the precision manufacture of high performance parts.
Keywords： high performance function-geometry integration precision machining difficult-to-cut material complex surface
Weng Yuqing
Strategic Study of CAE 2002, Volume 4, Issue 3, Pages 48-53
Advance on “Ultra Steel”，which is characterized by fine grained microstructure，is described in this paper. Progress has been made in this field in China. Yielding strength increases from 235 Mpa to 420〜 470 Mpa while elongation increases from 26% to 29% 〜34% for plain carbon steels. The high strength steel with anti-delayed fracture function has been developed and its pilot testing has been successfully finished in IVECO Auto Com. with 13.9 grade.
Keywords： iron and steel materials basic research performance improvement advance
Study on high-speed train service performance
Lin Jianhui,Yi Cai,Zhang Weihua,Ding Jianming,Liu Lu and Zhang Bing
Strategic Study of CAE 2015, Volume 17, Issue 4, Pages 83-89
Due to the space-time span， there always is variation on the vibration and climate， which makes the se
Keywords： high-speed train； service performance； train detection； tracking test； performance evolution
Behaviors of super-long span prestressed cable-stayed bridge with CFRP cables and UHPC girder
Fang Zhi,Ren Liang,Fan Fenghong
Strategic Study of CAE 2012, Volume 14, Issue 7, Pages 53-59
To discuss the applicability of carbon fiber reinforced polymer (CFRP) cables and reactive powder concrete (RPC)in super long span cable stayed bridges, taking a 1 008 m cable stayed bridge using steel girder and steel cables as example, a cable stayed bridge with the same span using RPC(reactive powder concrete) as the girder and advanced composite material CFRP (carbon fiber reinforced polymer) as the cable was designed, in which the cable cross section was determined by the principles of equivalent cable strength and the beam cross section was determined considering the stiffness, shear capacity and local stability. Based on the method of finite element analysis, the comparative study of these two structures on their static properties, dynamic properties, stability and wind resistance were carried out. The results show that it is feasible for using RPC as the girder and CFRP as the cable so as to form a highly efficient, durable cable stayed bridge of concrete structure and make its applicable span reach about 1 000 m long.
Keywords： cable-stayed bridge CFRP RPC mechanical properties
Development Strategies for High Performance Synthetic Resins in China
Zhang Liping, Yang Xueping, Chu Liqiu, Sheng Yiyi
Strategic Study of CAE 2020, Volume 22, Issue 5, Pages 121-127 doi: 10.15302/J-SSCAE-2020.05.011
High performance synthetic resin is a key basic material that supports the development of strategic emerging industries such as advanced manufacturing, new energy, and electronic information. In this article, we analyze the demand for high performance synthetic resins by industrial development and review the technical development trends of the industry in China in terms of high performance polyolefin resin and other high performance synthetic resins using the methods of literature research and expert consultation. Moreover, we summarize the problems of the industry including outdated domestic technology and equipment, foreign dependence on several high-end products, insufficiency in basic research, and inadequate efforts in solving the environmental pollution caused by waste plastics. After analyzing the key technologies regarding the high performance synthetic resins, we propose some industrial development suggestions. High-end products should be developed using existing equipment and technology and then put into large-scale application. Basic research and personnel training should be strengthened to guarantee technological innovation. Biodegradable plastics should be developed to promote sustainable development. Technical exchange and cooperation between petrochemical enterprises and universities should be enhanced to improve the efficiency of technology transformation and application.
Keywords： high performance synthetic resins high performance polyolefin industry trend key technology
Welding performance research of low cost hot rolled dual phase steel
Dong Ruifeng and Wang Guodong
Strategic Study of CAE 2014, Volume 16, Issue 2, Pages 53-57
The tensile properties，impact toughness and hardness of the welded joints of DP590 low-cost hot rolled dual phase steel using appropriate welding wire，flux and reasonable welding process was studied. The excellent softening resistance，cold bending formability and low hardening tendency of the test steels was shown. Experimental results showed that the DP590 low- cost hot rolled dual phase steel with good welding performance was suitable for welding car wheels and beams，etc.
Keywords： low cost dual phase steel welding performance
Study on Ignition of Thermoplastic Linings
Xu Liang,Zhang Heping and Wan Yutian
Strategic Study of CAE 2007, Volume 9, Issue 12, Pages 39-43
Keywords： thermoplastics ignitability critical heat flux ignition temperature
Self-deployed execution environment for high performance computing Research Articles
Mingtian SHAO, Kai LU, Wenzhe ZHANG
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6, Pages 845-857 doi: 10.1631/FITEE.2100016
Traditional (HPC) systems provide a standard preset environment to support scientific computation. However, HPC development needs to provide support for more and more diverse applications, such as artificial intelligence and big data. The standard preset environment can no longer meet these diverse requirements. If users still run these emerging applications on HPC systems, they need to manually maintain the specific dependencies (libraries, environment variables, and so on) of their applications. This increases the development and deployment burden for users. Moreover, the multi-user mode brings about privacy problems among users. Containers like Docker and Singularity can encapsulate the job's , but in a highly customized HPC system, cross-environment application deployment of Docker and Singularity is limited. The introduction of container images also imposes a maintenance burden on system administrators. Facing the above-mentioned problems, in this paper we propose a self-deployed (SDEE) for HPC. SDEE combines the advantages of traditional virtualization and modern containers. SDEE provides an isolated and customizable environment (similar to a virtual machine) to the user. The user is the root user in this environment. The user develops and debugs the application and deploys its special dependencies in this environment. Then the user can load the job to compute nodes directly through the traditional HPC job management system. The job and its dependencies are analyzed, packaged, deployed, and executed automatically. This process enables transparent and rapid job deployment, which not only reduces the burden on users, but also protects user privacy. Experiments show that the overhead introduced by SDEE is negligible and lower than those of both Docker and Singularity.
Keywords： Execution environment High performance computing Light-weight Isolation Overlay
Real-Time Assessment and Diagnosis of Process Operating Performance
Shabnam Sedghi,Biao Huang
Engineering 2017, Volume 3, Issue 2, Pages 214-219 doi: 10.1016/J.ENG.2017.02.004
Over time, the performance of processes may deviate from the initial design due to process variations and uncertainties, making it necessary to develop systematic methods for online optimality assessment based on routine operating process data. Some processes have multiple operating modes caused by the set point change of the critical process variables to achieve different product specifications. On the other hand, the operating region in each operating mode can alter, due to uncertainties. In this paper, we will establish an optimality assessment framework for processes that typically have multi-mode, multi-region operations, as well as transitions between different modes. The kernel density approach for mode detection is adopted and improved for operating mode detection. For online mode detection, the model-based clustering discriminant analysis (MclustDA) approach is incorporated with some a priori knowledge of the system. In addition, multi-modal behavior of steady-state modes is tackled utilizing the mixture probabilistic principal component regression (MPPCR) method, and dynamic principal component regression (DPCR) is used to investigate transitions between different modes. Moreover, a probabilistic causality detection method based on the sequential forward floating search (SFFS) method is introduced for diagnosing poor or non-optimum behavior. Finally, the proposed method is tested on the Tennessee Eastman (TE) benchmark simulation process in order to evaluate its performance.
Keywords： Optimality assessment Probabilistic principal component regression Multi-mode
Evacuation Analysis of a Large Shopping Mall
Song Weiguo,Yu Yanfei,Zhang Heping
Strategic Study of CAE 2005, Volume 7, Issue 10, Pages 78-83
Along with the development of the society, it flows out more and more high-rise, underground and large-space buildings, of which the fire protection designs are sometimes beyond the requirements of existing national fire protection codes of China. Therefore, the performance-based fire protection design of buildings has been getting more and more chances of application. Evacuation analysis is one of the key problems in the performance-based design. In this paper, the performance-based design of a large shopping mall is introduced, and a cellular automata (CA) based evacuation model, i.e. the CAFE model is used to analyze the efficiency of evacuation. Because the interactions among pedestrians and those between pedestrians and environment are quantified in CAFE model, the values of evacuation time obtained through the model are slightly larger than those of an evacuation software, Simulex, indicating that the CAFE model is to some extent more conservative and the analysis results are with higher reliability.
Keywords： evacuation performance-based design cellular automata
Study of properties and the preparation of composite of wheat straw and HDPE/PP
Yang Zhaozhe and Xu min
Strategic Study of CAE 2014, Volume 16, Issue 4, Pages 30-33
The paper is mixing the raw materials of wheat straw as enhanceosome and highdensity polyethylene/pohyprpylene (HDPE/PP) of thermoplastic to produced wood-plastic composite by adopting extrusion way and researching effect about the content of HDPE and PP on the properties of composite. Under a certain conditions，the high-speed mixer mixed the compound of wheat straw powder and thermoplastics and other auxiliaries，and then the compound were melting prilling by twin-screw extruder followed and molding by the single screw extruder.The mechanical properties of composite of wheat straw and thermoplastic were measured .The results indicated that adding a small amount of wheat straw powder caused the reduction of mechanical properties of wood plastic composite，the mechanical properties of wood plastic composite increased with increasing wheat straw powder content，mechanical properties decreased when the content of wheat straw was more than a certain percentage，especially，the impact property decreased obviously；the test indicated that the mechanical properties of HDPE were higher than PP.
Keywords： wheat straw powder HDPE PP composite materials performance studies
Study on concoction and water mist fire suppression performance of new composite additives
Liu Jianghong,Jin Xiang,Liao Guangxuan
Strategic Study of CAE 2010, Volume 12, Issue 9, Pages 58-62
Water mists for fire suppression and control have widely received considerable attention as one of the potential methods for halon replacement. A new composite additive was concocted and its effectiveness to water mist's fire suppression performance was investigated through the base of ethanol fire, diesel fire and wood crib fire. Results showed that this additive can greatly improve the fire suppression efficiency of water mist and shorten the extinguishing time remarkably. The fire suppression mechanism of water mist with this additive was combined with physical and chemical effect. However, the surface cooling and fuel isolation were considered to be the crucial suppression mechanism.
Keywords： water mist additive concoction fire suppression performance
Wang Dianzuo,Yao Guocheng
Strategic Study of CAE 2011, Volume 13, Issue 3, Pages 4-11
From the early 20th century, the froth flotation technology, which is the important way for efficient utilization of mineral resources, has been used in industry scaly. Flotation reagents are the foundation and the key of the technology. The paper introduced the relationship between structure and property of flotation reagents, and discussed the hisftory and new progress on molecular design of flotation reagents.
Keywords： mineral processing flotation reagents structure and property molecular design
Title Author Date Type Operation
Adaptive tracking control of high-order MIMO nonlinear systems with prescribed performance
Xuerao Wang, Qingling Wang, Changyin Sun,wangxuerao@seu.edu.cn,qlwang@seu.edu.cn,cysun@seu.edu.cn
Journal Article
Decentralized fault-tolerant cooperative control of multipleUAVs with prescribed attitude synchronization tracking performance under directed communication topology
Zi-quan YU, Zhi-xiang LIU, You-min ZHANG, Yao-hong QU, Chun-yi SU
Journal Article
Function-geometry integrated precision machining methodsand technologies for high performance workpieces
Guo Dongming
Journal Article
Study on high-speed train service performance
Lin Jianhui,Yi Cai,Zhang Weihua,Ding Jianming,Liu Lu and Zhang Bing
Journal Article
Behaviors of super-long span prestressed cable-stayed bridge with CFRP cables and UHPC girder
Fang Zhi,Ren Liang,Fan Fenghong
Journal Article
Development Strategies for High Performance Synthetic Resins in China
Zhang Liping, Yang Xueping, Chu Liqiu, Sheng Yiyi
Journal Article
Welding performance research of low cost hot rolled dual phase steel
Dong Ruifeng and Wang Guodong
Journal Article
Self-deployed execution environment for high performance computing
Mingtian SHAO, Kai LU, Wenzhe ZHANG
Journal Article
Real-Time Assessment and Diagnosis of Process Operating Performance
Shabnam Sedghi,Biao Huang
Journal Article
Study of properties and the preparation of composite of wheat straw and HDPE/PP
Yang Zhaozhe and Xu min
Journal Article
Study on concoction and water mist fire suppression performance of new composite additives
Liu Jianghong,Jin Xiang,Liao Guangxuan
Journal Article
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