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瞬变信息
相关语句
  transient information
     Extraction of Transient Information in Machinery Diagnosis
     瞬变信息提取与机器诊断
短句来源
     So,it is necessary to study its local time-frequency feature and extract its transient information.
     对非平稳信号分析,付氏变换效果不佳,需要研究这类信号的局部时频特征,提取瞬变信息方能准确地诊断.
短句来源
  “瞬变信息”译为未确定词的双语例句
     Through obtaining WT's coefficient of PSK signals, the phase changes between different symbols can be effectively extracted.
     通过对信号作固定尺度下的小波变换,提取PSK信号符号间的相位瞬变信息.
短句来源
  相似匹配句对
     Information collection and using;
     信息
短句来源
     Information
     信息
短句来源
     Extraction of Transient Information in Machinery Diagnosis
     瞬变信息提取与机器诊断
短句来源
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  transient information
This transient information will eventually be used to identify and improve the features used to classify the valve condition.
      
Constructing Multilevel Metadata Networks for Sharing Dispersed and Transient Information in a Mobile Environment
      
Separation of transient information in musical audio using multiresolution analysis techniques.
      
Working memory systems are those that actively maintain transient information that is critical for successful decision-making in the current context.
      


Non-stationary signal arises from mechanical shock,friction,unstable speed and changed load. Fourier transform doesn't fit its processing. So,it is necessary to study its local time-frequency feature and extract its transient information. In this paper,two kinds of new time-frequency analysis approaches for non-stationary signal processing are introduced,which are wavelet transform and short-time Fourier transform. These two approaches and Fourier transform are applied to analyse vibration signal. From this...

Non-stationary signal arises from mechanical shock,friction,unstable speed and changed load. Fourier transform doesn't fit its processing. So,it is necessary to study its local time-frequency feature and extract its transient information. In this paper,two kinds of new time-frequency analysis approaches for non-stationary signal processing are introduced,which are wavelet transform and short-time Fourier transform. These two approaches and Fourier transform are applied to analyse vibration signal. From this paper,conclusions are obtained to show that time-frequency analysis is superior to Fourier transform in non-stationary signal processing.

机器的二次信号往往因机器故障产生大量的冲击、摩擦以及运行转速的不稳定、负荷的变化导致非平稳信号的产生.对非平稳信号分析,付氏变换效果不佳,需要研究这类信号的局部时频特征,提取瞬变信息方能准确地诊断.本文介绍处理非平稳信号的新型工具——小波分析、短时付氏变换两种时频分析方法.最后用小波分析、短时付氏变换和付氏变换对机器的实测振动信号进行分析.说明了小波分析、短时付氏变换作为时频分析方法对处理非平稳信号比付氏变换优越.

Studies the function of wavelet transform (WT) that can effectively distill the transient characteristics of digital signals to estimate the symbol rate of PSK signals. Through obtaining WT's coefficient of PSK signals, the phase changes between different symbols can be effectively extracted. By means of the autocorrelation operation of the WT's coefficient and other processes the symbol rate of PSK signals is then estimated accurately. The advantages of this method include no need of any prior knowledge of...

Studies the function of wavelet transform (WT) that can effectively distill the transient characteristics of digital signals to estimate the symbol rate of PSK signals. Through obtaining WT's coefficient of PSK signals, the phase changes between different symbols can be effectively extracted. By means of the autocorrelation operation of the WT's coefficient and other processes the symbol rate of PSK signals is then estimated accurately. The advantages of this method include no need of any prior knowledge of the modulated signals and accurate estimation even at low signaltonoise ratio (SNR). Simulation in Matlab environment with BPSK,QPSK and 8PSK signals shows that the symbol rate estimation is accurate at SNR≥8 dB.

研究基于小波变换有效提取信号瞬变特性的功能,对数字调制移相键控(PSK)信号进行符号速率估计.通过对信号作固定尺度下的小波变换,提取PSK信号符号间的相位瞬变信息.然后通过对小波变换幅值求自相关运算及其他处理,实现对PSK信号符号速率的准确估计.该方法的优点是无需任何PSK信号的先验知识,在低信噪比下仍能准确估计.对BPSK,QPSK和8PSK信号在Matlab环境下的仿真结果表明,信噪比≥8dB时能准确估计其符号速率.

 
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