检索结果-南通市图书馆

Applications of Fractional Lower Order Time-frequency Representation to Machine Bearing Fault Diagnosis

IEEE/CAA Journal of Automatica Sinica 2017年第4期4卷 734-750页

作者： Junbo Long Haibin Wang Peng Li Hongshe Fan Department of Electrical and Engineering Jiujiang UniversityJiujiang 332005China

The machinery fault signal is a typical non-Gaussian and non-stationary process. The fault signal can be described by SaS distribution model because of the presence of impulses.Time-frequency distribution is a useful tool to extract helpful information of the machinery fault signal. Various fractional lower order(FLO) time-frequency distribution methods have been proposed based on fractional lower order statistics, which include fractional lower order short time Fourier transform(FLO-STFT), fractional lower order Wigner-Ville distributions(FLO-WVDs), fractional lower order Cohen class time-frequency distributions(FLO-CDs), fractional lower order adaptive kernel time-frequency distributions(FLO-AKDs) and adaptive fractional lower order time-frequency auto-regressive moving average(FLO-TFARMA) model time-frequency representation method.The methods and the exiting methods based on second order statistics in SaS distribution environments are compared, simulation results show that the new methods have better performances than the existing methods. The advantages and disadvantages of the improved time-frequency methods have been summarized.Last, the new methods are applied to analyze the outer race fault signals, the results illustrate their good performances.

关键词： adaptive function Alpha stable distribution auto-regressive(AR) model non-stationary signal parameter estimation time frequency representation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design and Analysis of a Self-adaptive Monorail Transporter without Power Supply

Design and Analysis of a Self-Adaptive Monorail Transporter ...

引用

作者： Bao Zhou Rui Hu Miao He Yujin Wang Hui Jin College of Mechanical Engineering Chongqing University of Technology

An unpowered monorail transporter with self-adaptive function is proposed, which can convey crops downward at a relatively stable speed in mountainous regions. The monorail transporter is composed of the body, guiding mechanism, damping mechanism, braking mechanism, etc. Through the combination of compression spring, torsion spring and linear bearing, the transporter can adapt itself to the track passively and adjust its speed self-adaptively. The mechanical structure is designed in the paper firstly, and then the functional relationship between the speed and the stiffness of springs and the track parameters is obtained through the analysis of the kinematics and turning performance. Furthermore, a virtual simulation model is established to verify the reasonableness of the mechanical structure design and the analysis process.

关键词： Transporter no power supply adaptive function

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：