为有效控制输电塔的有害振动需要了解其振动特性,提出一种惯性测量数据矩阵模式的输电塔振动分析方法。将微惯性测量单元(Micro-Inertia-Measurement-Unit,MIMU)安装在输电塔上通过Kalman滤波预处理三轴原始数据,重构权重奇异值分解(Wei...为有效控制输电塔的有害振动需要了解其振动特性,提出一种惯性测量数据矩阵模式的输电塔振动分析方法。将微惯性测量单元(Micro-Inertia-Measurement-Unit,MIMU)安装在输电塔上通过Kalman滤波预处理三轴原始数据,重构权重奇异值分解(Weighted Singular Value Decomposition,WSVD)后的相干振动分量建立平动/扭动矩阵。提取矩阵序列中的变换矩阵,计算其Frobenius范数度量暂态振动间的变异度来估计幅值与频率。根据幅频参数计算振动耗能,观测输电塔各轴向以及整体的振动情况。最后设计振动台、转台实验验证振动数据处理方法的有效性,并对不同风荷载下的塔线模型与真型风振试验进行特性分析。结果表明输电塔振动以水平方向的平动形式为主,随风向夹角的增大其非线性效应逐渐增强,所提出的数据处理方法能够有效获得振动信息,可为控制有害振动的阻尼器的设计提供参考。展开更多
In the past 30 years,signed directed graph(SDG) ,one of the qualitative simulation technologies,has been widely applied for chemical fault diagnosis.However,SDG based fault diagnosis,as any other qualitative method,ha...In the past 30 years,signed directed graph(SDG) ,one of the qualitative simulation technologies,has been widely applied for chemical fault diagnosis.However,SDG based fault diagnosis,as any other qualitative method,has poor diagnostic resolution.In this paper,a new method that combines SDG with qualitative trend analysis(QTA) is presented to improve the resolution.In the method,a bidirectional inference algorithm based on assumption and verification is used to find all the possible fault causes and their corresponding consistent paths in the SDG model.Then an improved QTA algorithm is used to extract and analyze the trends of nodes on the consis-tent paths found in the previous step.New consistency rules based on qualitative trends are used to find the real causes from the candidate causes.The resolution can be improved.This method combines the completeness feature of SDG with the good diagnostic resolution feature of QTA.The implementation of SDG-QTA based fault diagno-sis is done using the integrated SDG modeling,inference and post-processing software platform.Its application is illustrated on an atmospheric distillation tower unit of a simulation platform.The result shows its good applicability and efficiency.展开更多
文摘为有效控制输电塔的有害振动需要了解其振动特性,提出一种惯性测量数据矩阵模式的输电塔振动分析方法。将微惯性测量单元(Micro-Inertia-Measurement-Unit,MIMU)安装在输电塔上通过Kalman滤波预处理三轴原始数据,重构权重奇异值分解(Weighted Singular Value Decomposition,WSVD)后的相干振动分量建立平动/扭动矩阵。提取矩阵序列中的变换矩阵,计算其Frobenius范数度量暂态振动间的变异度来估计幅值与频率。根据幅频参数计算振动耗能,观测输电塔各轴向以及整体的振动情况。最后设计振动台、转台实验验证振动数据处理方法的有效性,并对不同风荷载下的塔线模型与真型风振试验进行特性分析。结果表明输电塔振动以水平方向的平动形式为主,随风向夹角的增大其非线性效应逐渐增强,所提出的数据处理方法能够有效获得振动信息,可为控制有害振动的阻尼器的设计提供参考。
基金Supported by the Science and Technological Tackling Project of Heilongjiang Province(GB06A106)
文摘In the past 30 years,signed directed graph(SDG) ,one of the qualitative simulation technologies,has been widely applied for chemical fault diagnosis.However,SDG based fault diagnosis,as any other qualitative method,has poor diagnostic resolution.In this paper,a new method that combines SDG with qualitative trend analysis(QTA) is presented to improve the resolution.In the method,a bidirectional inference algorithm based on assumption and verification is used to find all the possible fault causes and their corresponding consistent paths in the SDG model.Then an improved QTA algorithm is used to extract and analyze the trends of nodes on the consis-tent paths found in the previous step.New consistency rules based on qualitative trends are used to find the real causes from the candidate causes.The resolution can be improved.This method combines the completeness feature of SDG with the good diagnostic resolution feature of QTA.The implementation of SDG-QTA based fault diagno-sis is done using the integrated SDG modeling,inference and post-processing software platform.Its application is illustrated on an atmospheric distillation tower unit of a simulation platform.The result shows its good applicability and efficiency.
