wavelet packet transform
Detection and Analysis of Hydrodynamic Noise in Hydro Turbine
The inner fluid state of hydro-turbine is essential to the efficiency, steady operation and life span of the whole hydro-turbine. Although the hydraulic design can be made great, but in reality the operation is beyond from the design conditions because of the factors, such as fabrication technology, operation situation or some uncertain factors. So it [...]
Detection and Analysis of Hydrodynamic Noise in Hydro Turbine
The inner fluid state of hydro-turbine is essential to the efficiency, steady operation and life span of the whole hydro-turbine. Although the hydraulic design can be made great, but in reality the operation is beyond from the design conditions because of the factors, such as fabrication technology, operation situation or some uncertain factors. So it [...]
Study on the Method of Bearing Fault Extraction Based on EMD and Wavelet Packet
First, after analyzing the characteristics and limitations of classic signal processing, the paper introduces today’s research focus—-Hilbert-Huang transform(HHT) and Wavelet transform(WT), which are the main method of non-stationary signals processing, and deeply studied the basic theory and algorithms.Second, this paper is focused on combining empirical mode decomposition and wavelet and point out that most of [...]
The Application of Wavelet Transform in Transient Power Quality Disturbance
As a result of the development of economy, the power quality to which is paid attention by more and more users and electric power department is not only the deviation of voltage and frequency from the rating value, but also include the phenomenon of oscillation and pulse.So, it is necessarily to detect and identify the [...]
Research on Structural Damage Identification of Girder Structure Base on Wavelet Packet Analysis
Long-span structure especially large bridge structure safety integrity and durability health monitoring during normal operation has gradually become academic and engineering research hotspot at home and abroad . Under the common function of disaster such as environmental erosion、materials aging、load long-term effects、fatigue effects、mutation effect and other disaster factors, Structure damage is unavoidable, Some component damage may [...]
Harmonic Analyzer Based on Improved Wavelet Packet Algorithm
Power harmonic distortion of the pollution problem is serious, harmonic pollution has become the power quality. Therefore, to monitoring and researching harmonic is not only a premise to limit and eliminate harmonic, but also an important factor of protecting the power supply system, equipment operation and personal safety. Currently, the methods of harmonic analysis include [...]