为有效提取滚动轴承振动信号故障特征,提出了一种基于特征模态分解(Feature Mode Decomposition, FMD)与色散熵(Dispersion Entropy, DisEn)的信号特征提取方法。首先利用FMD方法将不同状态的滚动轴承振动信号分解为若干固有模态函数(In...为有效提取滚动轴承振动信号故障特征,提出了一种基于特征模态分解(Feature Mode Decomposition, FMD)与色散熵(Dispersion Entropy, DisEn)的信号特征提取方法。首先利用FMD方法将不同状态的滚动轴承振动信号分解为若干固有模态函数(Intrinsic Mode Function, IMF)分量;然后计算各IMF分量的DisEn,组合构建原始振动信号的特征向量。仿真实验表明该方法能有效提取滚动轴承振动信号特征,并且根据提取的特征能够较好地识别滚动轴承的故障类型。To effectively extract the vibration signal fault features of rolling bearings, this paper proposed a signal feature extraction method based on Feature Mode Decomposition (FMD) and Dispersion Entropy (DisEn). Firstly, the FMD method is used to decompose the vibration signals of rolling bearings in different states into several Intrinsic Mode Function (IMF) components. Then, the DisEn of each IMF component is calculated and combined to construct the feature vector of the original vibration signal. Simulation experiments show that this method can effectively extract the vibration signal characteristics of rolling bearings, and can identify the fault types of rolling bearings well based on the extracted features.展开更多
FMD（Foot and Mouth Disease,FMD）是由FMD病毒引起的以偶蹄动物为主的急性、热性、高度传染性疫病,世界动物卫生组织（OIE）将其列为必须上级部门报告的动物传染病,我国相关部门规定列为一类动物疫病。FMD共有7种血清型,我国目前流行...FMD（Foot and Mouth Disease,FMD）是由FMD病毒引起的以偶蹄动物为主的急性、热性、高度传染性疫病,世界动物卫生组织（OIE）将其列为必须上级部门报告的动物传染病,我国相关部门规定列为一类动物疫病。FMD共有7种血清型,我国目前流行的类型有Asia-I型、O型和A型。为了解掌握甘肃省猪群中有无Asia-I-FMD抗体,我们对全省范围内猪的Asia-I-FMD抗体的现有水平进行了调查,现将结果报告如下：展开更多
Foot and mouth disease is the most contagious disease of mammals and has a great potential for causing severe economic loss in susceptible cloven-hoofed animals. Routine prophylactic vaccination in Egypt from 2012 til...Foot and mouth disease is the most contagious disease of mammals and has a great potential for causing severe economic loss in susceptible cloven-hoofed animals. Routine prophylactic vaccination in Egypt from 2012 till now has been conducted with Trivalent and/or hexavalent vaccine of MERIAL, against virus strains (O manisa + O-3039 + A Iran 05 + A Saudi 95 + Asia 1 + Sat2). This study aimed to evaluate the hemato-biochemical and immunological changes associated with the use of hexavalent vaccine alone or in combination with trivalent FMD vaccine. This study was carried out on 24 cattle divided into three groups eight cattle each. Group I served as control. Group II were selected from farms vaccinated with hexavalent FMD vaccine. Group III were selected from farms vaccinated with a combination of trivalent and hexavalent FMD vaccine. The results showed that both vaccinated groups showed a significant increase in total leukocytic count. Sera from hexavalent-trivalent vaccinated cattle demonstrated a significant increase in serum cortisol concentrations. Significant increase in serum activity of aspartate aminotransferase was recorded in animals vaccinated with a combination of hexavalent and trivalent vaccine. In addition, both regimes resulted in a significant increase in serum blood urea nitrogen compared to control. Both regimes induced a significant increase in serum levels of ceruloplasmin while phagocytic activity of neutrophils and phagocytic index was enhanced only by the hexavalent vaccine. Both vaccinated groups had significantly increased serum values of gamma globulins. These results suggested that hexavalent vaccine produced higher levels of safety and protective effects against FMD in cattle as compared to those produced by a combination of hexavalent and trivalent vaccines. It is also advisable to include the hexavalent vaccine within the program of obligatory and imperative vaccination against FMD.展开更多
文摘为有效提取滚动轴承振动信号故障特征,提出了一种基于特征模态分解(Feature Mode Decomposition, FMD)与色散熵(Dispersion Entropy, DisEn)的信号特征提取方法。首先利用FMD方法将不同状态的滚动轴承振动信号分解为若干固有模态函数(Intrinsic Mode Function, IMF)分量;然后计算各IMF分量的DisEn,组合构建原始振动信号的特征向量。仿真实验表明该方法能有效提取滚动轴承振动信号特征,并且根据提取的特征能够较好地识别滚动轴承的故障类型。To effectively extract the vibration signal fault features of rolling bearings, this paper proposed a signal feature extraction method based on Feature Mode Decomposition (FMD) and Dispersion Entropy (DisEn). Firstly, the FMD method is used to decompose the vibration signals of rolling bearings in different states into several Intrinsic Mode Function (IMF) components. Then, the DisEn of each IMF component is calculated and combined to construct the feature vector of the original vibration signal. Simulation experiments show that this method can effectively extract the vibration signal characteristics of rolling bearings, and can identify the fault types of rolling bearings well based on the extracted features.
文摘FMD（Foot and Mouth Disease,FMD）是由FMD病毒引起的以偶蹄动物为主的急性、热性、高度传染性疫病,世界动物卫生组织（OIE）将其列为必须上级部门报告的动物传染病,我国相关部门规定列为一类动物疫病。FMD共有7种血清型,我国目前流行的类型有Asia-I型、O型和A型。为了解掌握甘肃省猪群中有无Asia-I-FMD抗体,我们对全省范围内猪的Asia-I-FMD抗体的现有水平进行了调查,现将结果报告如下：
文摘Foot and mouth disease is the most contagious disease of mammals and has a great potential for causing severe economic loss in susceptible cloven-hoofed animals. Routine prophylactic vaccination in Egypt from 2012 till now has been conducted with Trivalent and/or hexavalent vaccine of MERIAL, against virus strains (O manisa + O-3039 + A Iran 05 + A Saudi 95 + Asia 1 + Sat2). This study aimed to evaluate the hemato-biochemical and immunological changes associated with the use of hexavalent vaccine alone or in combination with trivalent FMD vaccine. This study was carried out on 24 cattle divided into three groups eight cattle each. Group I served as control. Group II were selected from farms vaccinated with hexavalent FMD vaccine. Group III were selected from farms vaccinated with a combination of trivalent and hexavalent FMD vaccine. The results showed that both vaccinated groups showed a significant increase in total leukocytic count. Sera from hexavalent-trivalent vaccinated cattle demonstrated a significant increase in serum cortisol concentrations. Significant increase in serum activity of aspartate aminotransferase was recorded in animals vaccinated with a combination of hexavalent and trivalent vaccine. In addition, both regimes resulted in a significant increase in serum blood urea nitrogen compared to control. Both regimes induced a significant increase in serum levels of ceruloplasmin while phagocytic activity of neutrophils and phagocytic index was enhanced only by the hexavalent vaccine. Both vaccinated groups had significantly increased serum values of gamma globulins. These results suggested that hexavalent vaccine produced higher levels of safety and protective effects against FMD in cattle as compared to those produced by a combination of hexavalent and trivalent vaccines. It is also advisable to include the hexavalent vaccine within the program of obligatory and imperative vaccination against FMD.
