The capability requirements of the command, control, communication, computing, intelligence, surveillance, reconnaissance （C41SR） systems are full of uncertain and vague information, which makes it difficult to mode...The capability requirements of the command, control, communication, computing, intelligence, surveillance, reconnaissance （C41SR） systems are full of uncertain and vague information, which makes it difficult to model the C41SR architecture. The paper presents an approach to modeling the capability requirements with the fuzzy unified modeling language （UML） and building domain ontologies with fuzzy description logic （DL）. The UML modeling constructs are extended according to the meta model of Depart- ment of Defense Architecture Framework to improve their domain applicability, the fuzzy modeling mechanism is introduced to model the fuzzy efficiency features of capabilities, and the capability requirement models are converted into ontologies formalized in fuzzy DL so that the model consistency and reasonability can be checked with a DL reasoning system. Finally, a case study of C41SR capability requirements model checking is provided to demonstrate the availability and applicability of the method.展开更多
Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degrad...Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degradation mechanism of the RET is the same as the one of the normal stress condition. In order to check the consistency of two mechanisms, we conduct two enhancement tests with a missile servo system as an object of the study, and preprocess two sets of test data to establish the accelerated degradation models regarding the temperature change rate that is assumed to be the main applied stress of the servo system during the natural storage. Based on the accelerated degradation models and natural storage profile of the servo system, we provide and demonstrate a procedure to check the consistency of two mechanisms by checking the correlation and difference of two sets of degradation data. The results indicate that the two degradation mechanisms are significantly consistent with each other.展开更多
针对既有建筑数字化工作的资料采集难、建模规范性不足、数据核验难等问题,结合轨道交通项目特点,研究并提出既有轨道交通项目建筑信息模型(building information modeling,BIM)数据化方法。首先,结合运营运维数据需求,提出既有轨道交...针对既有建筑数字化工作的资料采集难、建模规范性不足、数据核验难等问题,结合轨道交通项目特点,研究并提出既有轨道交通项目建筑信息模型(building information modeling,BIM)数据化方法。首先,结合运营运维数据需求,提出既有轨道交通项目BIM数据化与场景应用总体框架。其次,研究制定BIM建模交付技术指引,并开发BIM构件标准库,以规范既有轨道交通项目BIM模型创建。然后,结合现场数据采集情况,采取不同方法创建既有轨道交通项目BIM模型。当图纸齐全时,以图纸为基准进行建模;当图纸缺失时,研究以现场图片、点云数据等为基础,通过构件特征识别和匹配BIM构件标准库的构件单元,辅助BIM模型创建。最后,为保障BIM模型质量,研发合标性检查工具,通过内嵌BIM标准规范自动检查BIM模型,并开展现场检查复核各专业BIM模型。目前已在深圳地铁既有运营线路项目开展BIM数据化应用,积累了BIM数字资产,可为其他城市既有运营线路BIM建设提供参考。展开更多
文摘The capability requirements of the command, control, communication, computing, intelligence, surveillance, reconnaissance （C41SR） systems are full of uncertain and vague information, which makes it difficult to model the C41SR architecture. The paper presents an approach to modeling the capability requirements with the fuzzy unified modeling language （UML） and building domain ontologies with fuzzy description logic （DL）. The UML modeling constructs are extended according to the meta model of Depart- ment of Defense Architecture Framework to improve their domain applicability, the fuzzy modeling mechanism is introduced to model the fuzzy efficiency features of capabilities, and the capability requirement models are converted into ontologies formalized in fuzzy DL so that the model consistency and reasonability can be checked with a DL reasoning system. Finally, a case study of C41SR capability requirements model checking is provided to demonstrate the availability and applicability of the method.
基金supported by the Natural Science Foundation of Hunan Province(2018JJ2282)
文摘Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degradation mechanism of the RET is the same as the one of the normal stress condition. In order to check the consistency of two mechanisms, we conduct two enhancement tests with a missile servo system as an object of the study, and preprocess two sets of test data to establish the accelerated degradation models regarding the temperature change rate that is assumed to be the main applied stress of the servo system during the natural storage. Based on the accelerated degradation models and natural storage profile of the servo system, we provide and demonstrate a procedure to check the consistency of two mechanisms by checking the correlation and difference of two sets of degradation data. The results indicate that the two degradation mechanisms are significantly consistent with each other.
文摘针对既有建筑数字化工作的资料采集难、建模规范性不足、数据核验难等问题,结合轨道交通项目特点,研究并提出既有轨道交通项目建筑信息模型(building information modeling,BIM)数据化方法。首先,结合运营运维数据需求,提出既有轨道交通项目BIM数据化与场景应用总体框架。其次,研究制定BIM建模交付技术指引,并开发BIM构件标准库,以规范既有轨道交通项目BIM模型创建。然后,结合现场数据采集情况,采取不同方法创建既有轨道交通项目BIM模型。当图纸齐全时,以图纸为基准进行建模;当图纸缺失时,研究以现场图片、点云数据等为基础,通过构件特征识别和匹配BIM构件标准库的构件单元,辅助BIM模型创建。最后,为保障BIM模型质量,研发合标性检查工具,通过内嵌BIM标准规范自动检查BIM模型,并开展现场检查复核各专业BIM模型。目前已在深圳地铁既有运营线路项目开展BIM数据化应用,积累了BIM数字资产,可为其他城市既有运营线路BIM建设提供参考。
