期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于FARX和RBFNN模型的压铸机液压系统故障诊断 被引量:3
1
作者 宋鹏 彭继慎 《特种铸造及有色合金》 CAS CSCD 北大核心 2011年第1期50-53,105,共4页
提出了一种基于FARX和RBFNN的压铸机液压系统故障诊断新方法。模糊化之后的ARX模型不仅保留了其自回归系数对故障状态变化规律反映非常敏感的特性,而且能够实现对非线性故障特征更准确的描述。故障诊断中首先对目标系统的故障状态建立F... 提出了一种基于FARX和RBFNN的压铸机液压系统故障诊断新方法。模糊化之后的ARX模型不仅保留了其自回归系数对故障状态变化规律反映非常敏感的特性,而且能够实现对非线性故障特征更准确的描述。故障诊断中首先对目标系统的故障状态建立FARX模型,提取其故障特征作为RBF网络训练样本,根据RBF网络的输出结果确定故障类型。仿真实例验证了此方法的准确性和有效性。 展开更多
关键词 压铸机 故障诊断 模糊有源自回归模型(farx) 径向基函数神经网络(RBFNN)
在线阅读 下载PDF
Functional Causality between Oil Prices and GDP Based on Big Data 被引量:2
2
作者 Ibrahim Mufrah Almanjahie Zouaoui Chikr Elmezouar Ali Laksaci 《Computers, Materials & Continua》 SCIE EI 2020年第5期593-604,共12页
This paper examines the causal relationship between oil prices and the Gross Domestic Product(GDP)in the Kingdom of Saudi Arabia.The study is carried out by a data set collected quarterly,by Saudi Arabian Monetary Aut... This paper examines the causal relationship between oil prices and the Gross Domestic Product(GDP)in the Kingdom of Saudi Arabia.The study is carried out by a data set collected quarterly,by Saudi Arabian Monetary Authority,over a period from 1974 to 2016.We seek how a change in real crude oil price affects the GDP of KSA.Based on a new technique,we treat this data in its continuous path.Precisely,we analyze the causality between these two variables,i.e.,oil prices and GDP,by using their yearly curves observed in the four quarters of each year.We discuss the causality in the sense of Granger,which requires the stationarity of the data.Thus,in the first Step,we test the stationarity by using the Monte Carlo test of a functional time series stationarity.Our main goal is treated in the second step,where we use the functional causality idea to model the co-variability between these variables.We show that the two series are not integrated;there is one causality between these two variables.All the statistical analyzes were performed using R software. 展开更多
关键词 Functional time series functional stationarity FAR farx CAUSALITY
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部