Welding is commonly employed to connect large-scale components in practical engineering.Predicting the resulting deforma-tion and residual stresses during the welding process is typically essential.The thermal-elastic...Welding is commonly employed to connect large-scale components in practical engineering.Predicting the resulting deforma-tion and residual stresses during the welding process is typically essential.The thermal-elastic-plastic method simulates the welding process by examining heat distribution and elastic-plastic stresses.Despite its high computational accuracy,this method is often time-consuming,rendering it less suitable for large component welding predictions.In contrast,the inherent strain method skips the welding process and fo-cuses on the inherent strain in the weld and joint areas post-welding.This method is fast and convenient,particularly suitable for the analysis of large and complex structures.The results show that the error rate is 4.6%when using the inherent strain method to calculate the welding deformation of the test plate.In the calculation of welded parts,the error rate is 5%,which is within the tolerance of the actual engineering.In this paper,the simulation accuracy of the deformation results of the inherent strain method is validated by simulating fusion vacuum ves-sel mockup,aiming to reduce the cost of welding analysis by using this method and to provide reference for practical welding applications.展开更多
建立了空间对接机构数字化装配系统的体系结构,在Vis-Mockup平台软件基础上,采用C#和SQL Server 2005数据库完成了系统开发,实现了空间对接机构的模型预处理、装配过程仿真和装配过程示教功能。该系统已在企业得到初步应用,主要用于培...建立了空间对接机构数字化装配系统的体系结构,在Vis-Mockup平台软件基础上,采用C#和SQL Server 2005数据库完成了系统开发,实现了空间对接机构的模型预处理、装配过程仿真和装配过程示教功能。该系统已在企业得到初步应用,主要用于培训和辅助装配人员进行航天产品的装配。该系统为装配人员提供了数字化的培训工具,改变了过去传统的培训模式,提高了培训的质量和效率。通过对数字化装配操作验证和装配工艺数据的统计计算,为产品设计改进和装配工艺优化提供了定量数据。通过对装配过程的三维仿真、记录装配顺序、路径和操作和三维动画再现,实现了装配知识、经验和操作技巧的保存和再现。展开更多
In this work, we present DUSM （Disciplined Use Cases with Screen Mockups）, a novel method for describing and refining requirements specifications based on disciplined use cases and screen mockups. Disciplined use ca...In this work, we present DUSM （Disciplined Use Cases with Screen Mockups）, a novel method for describing and refining requirements specifications based on disciplined use cases and screen mockups. Disciplined use cases are characterized by a quite stringent template to prevent common mistakes, and to increase the quality of the specifications. Use cases descriptions are formulated in a structured natural language, which allows to reach a good level of precision, avoiding the need for further notations and complex models. Screen mockups are precisely associated with the steps of the use cases scenarios and they present the corresponding GUIs （graphical user interfaces） as seen by the human actors before/after the steps executions, improving the comprehension and the expression of the non-functional requirements on the user interface. DUSM has been proposed and fine-tuned during several editions of a software engineering course at the University of Genova. Then, by means of a series of case studies and experiments, we validated the method and evaluated： 1） its effectiveness in improving the comprehension and, in general, the quality of the produced requirements specification, and 2） its applicability in the industry, where the method has been found useful and not particularly onerous.展开更多
基金supported by the National Key Scientific and Technological Infrastructure Construction Project(No.2018-000052-73-01-001228)National Natural Science Foundation of China Young Scientists Fund Project(12105185)Science Foundation of Institute of Plasma Physics,Chinese Academy of Sciences(No.DSJJ-2023-06).
文摘Welding is commonly employed to connect large-scale components in practical engineering.Predicting the resulting deforma-tion and residual stresses during the welding process is typically essential.The thermal-elastic-plastic method simulates the welding process by examining heat distribution and elastic-plastic stresses.Despite its high computational accuracy,this method is often time-consuming,rendering it less suitable for large component welding predictions.In contrast,the inherent strain method skips the welding process and fo-cuses on the inherent strain in the weld and joint areas post-welding.This method is fast and convenient,particularly suitable for the analysis of large and complex structures.The results show that the error rate is 4.6%when using the inherent strain method to calculate the welding deformation of the test plate.In the calculation of welded parts,the error rate is 5%,which is within the tolerance of the actual engineering.In this paper,the simulation accuracy of the deformation results of the inherent strain method is validated by simulating fusion vacuum ves-sel mockup,aiming to reduce the cost of welding analysis by using this method and to provide reference for practical welding applications.
文摘建立了空间对接机构数字化装配系统的体系结构,在Vis-Mockup平台软件基础上,采用C#和SQL Server 2005数据库完成了系统开发,实现了空间对接机构的模型预处理、装配过程仿真和装配过程示教功能。该系统已在企业得到初步应用,主要用于培训和辅助装配人员进行航天产品的装配。该系统为装配人员提供了数字化的培训工具,改变了过去传统的培训模式,提高了培训的质量和效率。通过对数字化装配操作验证和装配工艺数据的统计计算,为产品设计改进和装配工艺优化提供了定量数据。通过对装配过程的三维仿真、记录装配顺序、路径和操作和三维动画再现,实现了装配知识、经验和操作技巧的保存和再现。
文摘In this work, we present DUSM （Disciplined Use Cases with Screen Mockups）, a novel method for describing and refining requirements specifications based on disciplined use cases and screen mockups. Disciplined use cases are characterized by a quite stringent template to prevent common mistakes, and to increase the quality of the specifications. Use cases descriptions are formulated in a structured natural language, which allows to reach a good level of precision, avoiding the need for further notations and complex models. Screen mockups are precisely associated with the steps of the use cases scenarios and they present the corresponding GUIs （graphical user interfaces） as seen by the human actors before/after the steps executions, improving the comprehension and the expression of the non-functional requirements on the user interface. DUSM has been proposed and fine-tuned during several editions of a software engineering course at the University of Genova. Then, by means of a series of case studies and experiments, we validated the method and evaluated： 1） its effectiveness in improving the comprehension and, in general, the quality of the produced requirements specification, and 2） its applicability in the industry, where the method has been found useful and not particularly onerous.
