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Railway vehicle is usually working in hazardous environment. The operational status of axle, which is the railway vehicle's main components to run, affects the safe operation of the railway vehicle directly. Over the years, the railway of our country has remained low equipment-rate, high using-rate and high intensity-transport. In addition, because of the need of the rapid development of economy,...
Motor's abnormal vibration signal includes its fault information, effective testing and analysis of its vibration signal is the key to realize motor fault diagnosis. Vibration testing and analysis system was put up to realize the acquisition, display, analysis, storage and replay of vibration signal by using NI-WLS9234 Data Acquisition Card in this paper. Call the analysis function of wavelet in MATLAB...
In the process of signal testing, often exposed to interference and influence of all kinds of noise signal, such as data collection and transmission and so may introduce noise. So in practical applications, before analysis of the data measured, the need for de-noising processing. At present, there are two de-noising methods, the traditional Filtering method and the wavelet denoising method, when in...
A new harmonic analysis equipment based on wavelet transform (WT) and virtual instrument(VI)is generated in the paper, in hope of overcoming the disadvantages of traditional harmonic analysis such as low data processing ability and high-cost . We implemented real-time harmonic analysis for welding machine no-load voltage under this method. Compared with experimental data obtained by FLUKE 43B, this...
The pipeline leakage monitor system based on Virtual Instrument are introduced in this paper. As an important means of transportation, pipelines have been used all over the world. Pipeline leakage occurs frequently due to pipeline defect, which not only causes great loss of economy, but also leads to serious pollution to the environment. A real-time monitoring system for pipeline leak is established...
Based on the design concept of virtual instrument and the design method of function modulation, using PC machine and data acquisition card as hardware system, proposed a design of sewage multi-parameter online monitoring system which based on application program platform of Lab VIEW. The system has friendly human-machine interface, the function is comprehensive and it is easy to operate. It has achieved...
This paper developed a pipeline leak detection system based on virtual instrument LabVIEW and described the system principle, composition structure and development progress in detail. The pipeline leak detection system acquired pressure and flow at two ends of the pipeline real time, analyzed data by wavelet analysis functions offered by LabVIEW, detected leak through flow changes and located leak...
This paper presents a low-cost virtual instrument for detection and analysis of voltage notches in voltage supply using wavelets. A simple wavelet decomposition tree has been used for detection and analysis of the two main features of voltage notching: the transients associated with the beginning and the end of the commutation notches and the stationary high-frequency components of the spectrum of...
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