Identify the Defect of Bearing Vibration and Noise with Wavelet Packet Energy Spectrum;

A new energy spectrum description method of electrochemical noise(EN)signals was described by wavelet packets decomposition.

Based on the analysis of energy feature of vibration signal, a signal feature representation method based on the energy spectrum of wavelet packets is proposed, which represent the signal feature through computing the energy of the wavelet packets decomposition, and this method is effective in compressing the vibration signal to be a vector.

In this criterion the comprehensive effect of transient components of zero-sequence voltage and the third harmonic voltage is considered,and the ratio of spectral energy of restraint signal to that of operation signal is taken as restraint coefficient.

The peak energy amounts of the different frequencies of the loosing signals of turbine are utilized as training samples to input the LVQ network,and then the network outputs the scale vectors after training.

The persistent current and the quantum energy spectrum in mesoscopic metal dual rings;

Quantum Kirchhoff s equation of the system is given by Heisenberg s moving equation,and the characters of quantum energy spectrum are analyzed and investigated by solving the eigenvalue equation of Hamilton operator.

For the mesoscopic metal ring system in external magnetic field,supposing the system has a symmetry under translation in charge space,the quantum current and the quantum energy spectrum in mesoscopic metal ring are given by solving thire eigenvalue equations;and the quantum fluctuations of the current and the energy have been calculated by the character of the minimum shift operator.