In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamb...In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamber was conducted. Based on mathematical description of optimal arrangement for pressure measurement points,fuzzy clustering analysis and discriminant analysis were used to divide pressure regions of nodes on bulkhead. Finally,the selection method of optimal measurement points was proposed,and by selecting d6.28 m EPBS as study object,the case study was conducted. By contrast,based on optimal arrangement scheme of pressure measurement points,through adopting weighted algorithm,the absolute error mean of equivalent pressure of working chamber is the smallest. In addition,pressure curve of optimal arrangement points presents parabola,and it can show the state of pressure distribution on bulkhead truly. It is concluded that the optimal arrangement method of pressure measurement points in working chamber is effective and feasible,and the method can provide basis for realizing high precision pressure control of EPBS.展开更多
为提高风洞调试和运行时的结构安全性,设计研制一种大型低速风洞结构健康监测系统。针对风洞监测对象位置散、可移动的特点,对结构健康监测(structural health monitoring,SHM)需求进行精准分析。在分析基础上,系统采用基于光纤环网和...为提高风洞调试和运行时的结构安全性,设计研制一种大型低速风洞结构健康监测系统。针对风洞监测对象位置散、可移动的特点,对结构健康监测(structural health monitoring,SHM)需求进行精准分析。在分析基础上,系统采用基于光纤环网和星形连接的混合网络架构,实现对分散结构状态数据的分布式采集、边缘计算和高效传输。运行系统表明:该系统在消声室流致振动监测评估、防护网拦截异物监测诊断等方面发挥了显著作用,有力保障了大型低速风洞运行安全。展开更多
基金Project(2007CB714006) supported by the National Basic Research Program of China
文摘In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamber was conducted. Based on mathematical description of optimal arrangement for pressure measurement points,fuzzy clustering analysis and discriminant analysis were used to divide pressure regions of nodes on bulkhead. Finally,the selection method of optimal measurement points was proposed,and by selecting d6.28 m EPBS as study object,the case study was conducted. By contrast,based on optimal arrangement scheme of pressure measurement points,through adopting weighted algorithm,the absolute error mean of equivalent pressure of working chamber is the smallest. In addition,pressure curve of optimal arrangement points presents parabola,and it can show the state of pressure distribution on bulkhead truly. It is concluded that the optimal arrangement method of pressure measurement points in working chamber is effective and feasible,and the method can provide basis for realizing high precision pressure control of EPBS.
文摘为提高风洞调试和运行时的结构安全性,设计研制一种大型低速风洞结构健康监测系统。针对风洞监测对象位置散、可移动的特点,对结构健康监测(structural health monitoring,SHM)需求进行精准分析。在分析基础上,系统采用基于光纤环网和星形连接的混合网络架构,实现对分散结构状态数据的分布式采集、边缘计算和高效传输。运行系统表明:该系统在消声室流致振动监测评估、防护网拦截异物监测诊断等方面发挥了显著作用,有力保障了大型低速风洞运行安全。
