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hydraulic pressure fluctuation
相关语句
  压力脉动
     TRANSIENT HYDRAULIC PRESSURE FLUCTUATION SIGNAL ANALYSIS OF HYDROTURBINE BASED ON HILBERT-HUANG TRANSFORM
     基于Hilbert-Huang变换的水轮机非平稳压力脉动信号分析
短句来源
     With the analysis of hydraulic pressure fluctuation in draft tube during the starting process as an example, it attempts to find its time variation with the operation conditions.
     以机组启动过程中的非平稳尾水管水力压力脉动信号分析为例,研究压力脉动在过渡过程中的时变特征。
短句来源
     Compared with the other time-frequency analysis methods, such as the short time Fourier transform, wavelet transform, and Wigner-Ville distribution, it is demonstrated that the Hilbert-Huang transform possesses high time-frequency resolution and applicability to analysis of nonstationary low-frequency hydraulic pressure fluctuation signal.
     与其它时频分析方法相比,Hilbert-Huang变换时频分辨率高,适合分析非平稳低频水力压力脉动信号。
短句来源
  水力压力脉动
     With the analysis of hydraulic pressure fluctuation in draft tube during the starting process as an example, it attempts to find its time variation with the operation conditions.
     以机组启动过程中的非平稳尾水管水力压力脉动信号分析为例,研究压力脉动在过渡过程中的时变特征。
短句来源
     Compared with the other time-frequency analysis methods, such as the short time Fourier transform, wavelet transform, and Wigner-Ville distribution, it is demonstrated that the Hilbert-Huang transform possesses high time-frequency resolution and applicability to analysis of nonstationary low-frequency hydraulic pressure fluctuation signal.
     与其它时频分析方法相比,Hilbert-Huang变换时频分辨率高,适合分析非平稳低频水力压力脉动信号。
短句来源
  液压脉动
     A DSC based supervisory control and data acquisition system of the engine oil radiator hydraulic pressure fluctuation fatigue test is introduced.
     介绍了一种基于 DCS 机理的内燃机机油冷却器液压脉动疲劳试验的数据采集与监视控制( SCADA)系统。
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A DSC based supervisory control and data acquisition system of the engine oil radiator hydraulic pressure fluctuation fatigue test is introduced.The system uses IPC as the supervisory management level,uses the push-in type controller as the on-site direct digital control level.The system has advantages of flexible configuration,reliable running,good real-time performance and easy management and maintenance of test information, etc.. Its structure,functions,working procedures,hardware and software platform...

A DSC based supervisory control and data acquisition system of the engine oil radiator hydraulic pressure fluctuation fatigue test is introduced.The system uses IPC as the supervisory management level,uses the push-in type controller as the on-site direct digital control level.The system has advantages of flexible configuration,reliable running,good real-time performance and easy management and maintenance of test information, etc.. Its structure,functions,working procedures,hardware and software platform and realization process of system are introduced.

介绍了一种基于 DCS 机理的内燃机机油冷却器液压脉动疲劳试验的数据采集与监视控制( SCADA)系统。该系统以 IPC 为监控管理级,以嵌入式控制器应用于现场直接数字控制级,具有配置灵活、运行可靠、实时性好、试验信息管理和维护方便等特点。介绍了该系统的基本结构、功能设计、工作流程、软硬件平台设计和系统实现过程等。

Hydaulic pressure fluctuation is inevitable in the operation of hydroturbines. It features nonstationarity, especially in the transients. With the analysis of hydraulic pressure fluctuation in draft tube during the starting process as an example, it attempts to find its time variation with the operation conditions. In order to alleviate the computational burden and improve the resolution of time frequency analysis, the on-site acquired signal is down-sampled via multi-rate filter firstly. Then, it is analyzed...

Hydaulic pressure fluctuation is inevitable in the operation of hydroturbines. It features nonstationarity, especially in the transients. With the analysis of hydraulic pressure fluctuation in draft tube during the starting process as an example, it attempts to find its time variation with the operation conditions. In order to alleviate the computational burden and improve the resolution of time frequency analysis, the on-site acquired signal is down-sampled via multi-rate filter firstly. Then, it is analyzed based on the nonlinear and nonstationary time series analysis method-Hilbert-Huang transform, and the frequency components and their time variation with the operation conditions are identified clearly. From the analysis result, it can be concluded that the hydraulic pressure fluctuation features low frequency and strong nonstationarity. The amplitude and frequency are time varying, and closely related with the operation conditions, but not proportional to the speed. Compared with the other time-frequency analysis methods, such as the short time Fourier transform, wavelet transform, and Wigner-Ville distribution, it is demonstrated that the Hilbert-Huang transform possesses high time-frequency resolution and applicability to analysis of nonstationary low-frequency hydraulic pressure fluctuation signal.

水力压力脉动在水轮机的运行过程中是不可避免的现象,而且在过渡过程中具有较强的非平稳性。以机组启动过程中的非平稳尾水管水力压力脉动信号分析为例,研究压力脉动在过渡过程中的时变特征。为了降低时频分析的计算量,提高时频分辨率,首先应用采样率转换技术对现场测试信号进行预处理,然后应用Hilbert-Huang变换进行时频分析,识别确定信号中的频率成分及其相对机组运行条件的变化情况。分析结果表明:水轮机尾水管中的水力压力脉动以低频成分为主,其时变性与运行条件密切相关,但是在过渡过程中,其频率成分相对时间的变化情况与机组转速变化不成比例;与其它时频分析方法相比,Hilbert-Huang变换时频分辨率高,适合分析非平稳低频水力压力脉动信号。

 
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