Model-based system-of-systems(SOS)engineering(MBSoSE)is becoming a promising solution for the design of SoS with increasing complexity.However,bridging the models from the design phase to the simulation phase poses si...Model-based system-of-systems(SOS)engineering(MBSoSE)is becoming a promising solution for the design of SoS with increasing complexity.However,bridging the models from the design phase to the simulation phase poses significant challenges and requires an integrated approach.In this study,a unified requirement modeling approach is proposed based on unified architecture framework(UAF).Theoretical models are proposed which compose formalized descriptions from both topdown and bottom-up perspectives.Based on the description,the UAF profile is proposed to represent the SoS mission and constituent systems(CS)goal.Moreover,the agent-based simulation information is also described based on the overview,design concepts,and details(ODD)protocol as the complement part of the SoS profile,which can be transformed into different simulation platforms based on the eXtensible markup language(XML)technology and model-to-text method.In this way,the design of the SoS is simulated automatically in the early design stage.Finally,the method is implemented and an example is given to illustrate the whole process.展开更多
为研究双柱式桥墩结构在含大块石泥石流冲击作用下的动力响应特征,基于光滑粒子动力学-有限元(smoothed particle hydrodynamics-finite element method,SPH-FEM)耦合方法,建立泥石流浆体-大块石-双柱式桥墩动态相互作用模型,分别从泥...为研究双柱式桥墩结构在含大块石泥石流冲击作用下的动力响应特征,基于光滑粒子动力学-有限元(smoothed particle hydrodynamics-finite element method,SPH-FEM)耦合方法,建立泥石流浆体-大块石-双柱式桥墩动态相互作用模型,分别从泥石流冲击特征、桥墩结构应变和冲击力时程等方面,分析泥石流冲击下双柱式桥墩的动力学行为,探讨了不同特性泥石流对桥墩承灾破坏特征的影响.结果表明:所提出的数值分析方法可以较好地模拟泥石流冲击、沿桥墩绕流及流出的整个分布过程;泥浆冲击桥墩底部会出现明显的绕流现象,上游的桥墩柱体所受冲击力远大于下游;受块石冲击的桥墩底部承受较大的横向冲击力,导致出现较大应变,甚至混凝土脱落;桥墩所受冲击力与泥石流的冲击速度和大块石直径都呈正相关;夹杂着大块石的泥石流对桥墩的冲击力远大于仅有浆体的冲击力,是造成桥墩破坏的主要因素.研究成果有助于理解泥石流多发区双柱桥墩的冲击灾变机制,并为其抗冲击设计提供科学依据.展开更多
开发了针对海南昌江核电站分散式控制系统(Distributed Control System,DCS)的FES平台,利用该平台对海南昌江核电LOT2部分的系统画面和系统规程、LOT1部分的报警规程进行了设计验证.通过测试分析,发现并修改了设计过程中出现的不合理界...开发了针对海南昌江核电站分散式控制系统(Distributed Control System,DCS)的FES平台,利用该平台对海南昌江核电LOT2部分的系统画面和系统规程、LOT1部分的报警规程进行了设计验证.通过测试分析,发现并修改了设计过程中出现的不合理界面,改正了模型程序和软件系统的错误,完成了FES模型软件应用于FSS的可行性分析.展开更多
A simulation model for a certain diesel engine cooling system is set up by using GT-COOL. The backwater temperature response in different operating conditions is simulated numerically. The effects of single or multipl...A simulation model for a certain diesel engine cooling system is set up by using GT-COOL. The backwater temperature response in different operating conditions is simulated numerically. The effects of single or multiple system parameters on the water temperature are analyzed. The results show that, changing different single parameters, the time taken for the steady backwater temperature is different, but relatively short;and if multiple parameters are changed, the time will be longer. Referred to the thermal balance test, the simulation results are validated and provide a basis for the intelligent control of the cooling system.展开更多
To reduce complexity, the combat effectiveness simulation system(CESS) is often decomposed into static structure,physical behavior, and cognitive behavior, and model abstraction is layered onto domain invariant knowle...To reduce complexity, the combat effectiveness simulation system(CESS) is often decomposed into static structure,physical behavior, and cognitive behavior, and model abstraction is layered onto domain invariant knowledge(DIK) and application variant knowledge(AVK) levels. This study concentrates on the specification of CESS’s physical behaviors at the DIK level of abstraction, and proposes a model driven framework for efficiently developing simulation models within model-driven engineering(MDE). Technically, this framework integrates the four-layer metamodeling architecture and a set of model transformation techniques with the objective of reducing model heterogeneity and enhancing model continuity. As a proof of concept, a torpedo example is illustrated to explain how physical models are developed following the proposed framework. Finally, a combat scenario is constructed to demonstrate the availability, and a further verification is shown by a reasonable agreement between simulation results and field observations.展开更多
Combat system effectiveness simulation (CSES) is a special type of complex system simulation. Three non-functional requirements (NFRs), i.e. model composability, domain specific modeling, and model evolvability, are g...Combat system effectiveness simulation (CSES) is a special type of complex system simulation. Three non-functional requirements (NFRs), i.e. model composability, domain specific modeling, and model evolvability, are gaining higher priority from CSES users when evaluating different modeling methodologies for CSES. Traditional CSES modeling methodologies are either domain-neutral (lack of domain characteristics consideration and limited support for model composability) or domain-oriented (lack of openness and evolvability) and fall short of the three NFRs. Inspired by the concept of architecture in systems engineering and software engineering fields, we extend it into a concept of model architecture for complex simulation systems, and propose a model architecture-oriented modeling methodology in which the model architecture plays a central role in achieving the three NFRs. Various model-driven engineering (MDE) approaches and technologies, including simulation modeling platform (SMP), unified modeling language (UML), domain specific modeling (DSM), eclipse modeling framework (EMF), graphical modeling framework (GMF), and so forth, are applied where possible in representing the CSES model architecture and its components' behaviors from physical and cognitive domain aspects. A prototype CSES system, called weapon effectiveness simulation system (WESS), and a non-trivial air-combat simulation example are presented to demonstrate the methodology.展开更多
The effect of fin attachment on the thermal stress reduction of exhaust manifold of an off road diesel engine(Komatsu HD325-6) was investigated.For doing this,coupled thermo-fluid-solid analysis of exhaust manifold of...The effect of fin attachment on the thermal stress reduction of exhaust manifold of an off road diesel engine(Komatsu HD325-6) was investigated.For doing this,coupled thermo-fluid-solid analysis of exhaust manifold of the off road diesel engine was carried out.The thermal analysis,including thermal flow,thermal stress,and the thermal deformation of the manifold was investigated.The flow inside the manifold was simulated and then its properties including velocity,pressure,and temperature were obtained.The flow properties were transferred to the solid model and then the thermal stresses and the thermal deformations of the manifold under different operating conditions were calculated.Finally,based on the predicted thermal stresses and thermal deformations of the manifold body shell,two fin types as well as body shell thickness increase were applied in the critical induced thermal stress area of the manifold to reduce the thermal stress and thermal deformation.The results of the above modifications show that the combined modifications,i.e.the thickness increase and the fin attachment,decrease the thermal stresses by up to 28% and the contribution of the fin attachment in this reduction is much higher compared to the shell thickness increase.展开更多
The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronau...The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronautics, System Engineering Society of China, and Chinese Association for System Simulation. It started publication in 1990, and now is published bimonthly.展开更多
The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronau...The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronautics, System Engineering Society of China, and Chinese Association for System Simulation. It started publication in 1990, and now is published bimonthly.展开更多
The Journal of Systems Engineering and Electronics (English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corpo- ration,the Chinese Soc...The Journal of Systems Engineering and Electronics (English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corpo- ration,the Chinese Society of Astronautics,the Systems Engineering Society of China and the Chinese Association for System Simulation.It started publication in 1990,and now appears six times a year, distributed at home and abroad.展开更多
The Journal of Systems Engineering and Electronics(English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corporation, the Chinese Socie...The Journal of Systems Engineering and Electronics(English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corporation, the Chinese Society of Astronautics,the Systems Engineering Society of China,and the Chinese Association for System Simulation.It started publication in 1990,and now appears six times a year, distributed at home and abroad.展开更多
基金Fifth Electronic Research Institute of the Ministry of Industry and Information Technology(HK07202200877)Pre-research Project on Civil Aerospace Technologies of CNSA(D020101)+2 种基金Zhejiang Provincial Science and Technology Plan Project(2022C01052)Frontier Scientific Research Program of Deep Space Exploration Laboratory(2022-QYKYJHHXYF-018,2022-QYKYJH-GCXD-001)Zhiyuan Laboratory(ZYL2024001)。
文摘Model-based system-of-systems(SOS)engineering(MBSoSE)is becoming a promising solution for the design of SoS with increasing complexity.However,bridging the models from the design phase to the simulation phase poses significant challenges and requires an integrated approach.In this study,a unified requirement modeling approach is proposed based on unified architecture framework(UAF).Theoretical models are proposed which compose formalized descriptions from both topdown and bottom-up perspectives.Based on the description,the UAF profile is proposed to represent the SoS mission and constituent systems(CS)goal.Moreover,the agent-based simulation information is also described based on the overview,design concepts,and details(ODD)protocol as the complement part of the SoS profile,which can be transformed into different simulation platforms based on the eXtensible markup language(XML)technology and model-to-text method.In this way,the design of the SoS is simulated automatically in the early design stage.Finally,the method is implemented and an example is given to illustrate the whole process.
文摘为研究双柱式桥墩结构在含大块石泥石流冲击作用下的动力响应特征,基于光滑粒子动力学-有限元(smoothed particle hydrodynamics-finite element method,SPH-FEM)耦合方法,建立泥石流浆体-大块石-双柱式桥墩动态相互作用模型,分别从泥石流冲击特征、桥墩结构应变和冲击力时程等方面,分析泥石流冲击下双柱式桥墩的动力学行为,探讨了不同特性泥石流对桥墩承灾破坏特征的影响.结果表明:所提出的数值分析方法可以较好地模拟泥石流冲击、沿桥墩绕流及流出的整个分布过程;泥浆冲击桥墩底部会出现明显的绕流现象,上游的桥墩柱体所受冲击力远大于下游;受块石冲击的桥墩底部承受较大的横向冲击力,导致出现较大应变,甚至混凝土脱落;桥墩所受冲击力与泥石流的冲击速度和大块石直径都呈正相关;夹杂着大块石的泥石流对桥墩的冲击力远大于仅有浆体的冲击力,是造成桥墩破坏的主要因素.研究成果有助于理解泥石流多发区双柱桥墩的冲击灾变机制,并为其抗冲击设计提供科学依据.
文摘开发了针对海南昌江核电站分散式控制系统(Distributed Control System,DCS)的FES平台,利用该平台对海南昌江核电LOT2部分的系统画面和系统规程、LOT1部分的报警规程进行了设计验证.通过测试分析,发现并修改了设计过程中出现的不合理界面,改正了模型程序和软件系统的错误,完成了FES模型软件应用于FSS的可行性分析.
文摘A simulation model for a certain diesel engine cooling system is set up by using GT-COOL. The backwater temperature response in different operating conditions is simulated numerically. The effects of single or multiple system parameters on the water temperature are analyzed. The results show that, changing different single parameters, the time taken for the steady backwater temperature is different, but relatively short;and if multiple parameters are changed, the time will be longer. Referred to the thermal balance test, the simulation results are validated and provide a basis for the intelligent control of the cooling system.
基金supported by the National Natural Science Foundation of China(61273198)
文摘To reduce complexity, the combat effectiveness simulation system(CESS) is often decomposed into static structure,physical behavior, and cognitive behavior, and model abstraction is layered onto domain invariant knowledge(DIK) and application variant knowledge(AVK) levels. This study concentrates on the specification of CESS’s physical behaviors at the DIK level of abstraction, and proposes a model driven framework for efficiently developing simulation models within model-driven engineering(MDE). Technically, this framework integrates the four-layer metamodeling architecture and a set of model transformation techniques with the objective of reducing model heterogeneity and enhancing model continuity. As a proof of concept, a torpedo example is illustrated to explain how physical models are developed following the proposed framework. Finally, a combat scenario is constructed to demonstrate the availability, and a further verification is shown by a reasonable agreement between simulation results and field observations.
基金supported by the National Natural Science Foundation of China(61273198)
文摘Combat system effectiveness simulation (CSES) is a special type of complex system simulation. Three non-functional requirements (NFRs), i.e. model composability, domain specific modeling, and model evolvability, are gaining higher priority from CSES users when evaluating different modeling methodologies for CSES. Traditional CSES modeling methodologies are either domain-neutral (lack of domain characteristics consideration and limited support for model composability) or domain-oriented (lack of openness and evolvability) and fall short of the three NFRs. Inspired by the concept of architecture in systems engineering and software engineering fields, we extend it into a concept of model architecture for complex simulation systems, and propose a model architecture-oriented modeling methodology in which the model architecture plays a central role in achieving the three NFRs. Various model-driven engineering (MDE) approaches and technologies, including simulation modeling platform (SMP), unified modeling language (UML), domain specific modeling (DSM), eclipse modeling framework (EMF), graphical modeling framework (GMF), and so forth, are applied where possible in representing the CSES model architecture and its components' behaviors from physical and cognitive domain aspects. A prototype CSES system, called weapon effectiveness simulation system (WESS), and a non-trivial air-combat simulation example are presented to demonstrate the methodology.
文摘The effect of fin attachment on the thermal stress reduction of exhaust manifold of an off road diesel engine(Komatsu HD325-6) was investigated.For doing this,coupled thermo-fluid-solid analysis of exhaust manifold of the off road diesel engine was carried out.The thermal analysis,including thermal flow,thermal stress,and the thermal deformation of the manifold was investigated.The flow inside the manifold was simulated and then its properties including velocity,pressure,and temperature were obtained.The flow properties were transferred to the solid model and then the thermal stresses and the thermal deformations of the manifold under different operating conditions were calculated.Finally,based on the predicted thermal stresses and thermal deformations of the manifold body shell,two fin types as well as body shell thickness increase were applied in the critical induced thermal stress area of the manifold to reduce the thermal stress and thermal deformation.The results of the above modifications show that the combined modifications,i.e.the thickness increase and the fin attachment,decrease the thermal stresses by up to 28% and the contribution of the fin attachment in this reduction is much higher compared to the shell thickness increase.
文摘The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronautics, System Engineering Society of China, and Chinese Association for System Simulation. It started publication in 1990, and now is published bimonthly.
文摘The Journal of Systems Engineering and Electronics is a comprehensive academic periodical jointly sponsored by Defense Technology Academy of China Aerospace Science ＆ Industry Corporation, Chinese Society of Astronautics, System Engineering Society of China, and Chinese Association for System Simulation. It started publication in 1990, and now is published bimonthly.
文摘The Journal of Systems Engineering and Electronics (English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corpo- ration,the Chinese Society of Astronautics,the Systems Engineering Society of China and the Chinese Association for System Simulation.It started publication in 1990,and now appears six times a year, distributed at home and abroad.
文摘The Journal of Systems Engineering and Electronics(English Edition) is a comprehensive academic periodical jointly sponsored by the Second Academy of China Aerospace Science and Industry Corporation, the Chinese Society of Astronautics,the Systems Engineering Society of China,and the Chinese Association for System Simulation.It started publication in 1990,and now appears six times a year, distributed at home and abroad.
