The Study Of Fault Diagnosis Methods For Wing Turbine Gearbox Based On The Analysis Vibration Characteristics

With the development of society, the energy system based on oil, coal, natural gas promoting the progress of human society and improving the life quality, but also brings serious problems, such as environmental pollution and energy crisis. Compared with the non-renewable energy, wind energy has the advantages of easy mining, rich reserves, no pollution and sustainable use, etc. In recent years, the develpments of the wind technology is very fast. And wind power has become a new sources of the renewable energy with the most commercial prospect. Gearbox is an important transmission component in the transmission system of wind turbine,and its working state plays a key role for the running of the whole equipment.Wind has the characteristics of uncontrollability and instability. It will bring alternating and complex loads to wind turbines, and make the vibration signal of wind turbine gearbox very complex. In this paper, based on the investigation of the structure of the gearbox, the mechanism of vibration and fault features, the effective fault diagnosis and condition monigoring technologies were studied by using time-domain analysis and frequency-domain analysis. The main research works are introduced as follows:First of all, study on the structures of the gearbox and its vibration mechanism. Analyse the common types and the causes of gear faults. Then analyse and research the characteristics of the faulty vibration signal of the gearbox fault.Secondly, the commom analytical methods for vibration signal were introduced, including time-domain analysis, frequency-domain analysis and time-frequency analysis. Time-domain analysis methods include time synchronous averaging, time domain statistical analysis and empirical mode decomposition; Frequency-domain analysis techniques include the power spectrum, cepstrum and envelope analysis; Time-frequency analysis methods include short term Fourier transform, Wigner-Ville distribution and wavelet transform. Moreover the advantages and disadvantages of each method are analyzed briefly.And the test rigs for fault simulation based on planetary gearbox was introduced. Describe the components of the test rigs and the test procedures. Illustrate the type of sensor and it’s installation location.Simulate the gear pitting failure. Acquisite the healthy signal and fault signal at different speed in different load conditions.Lastly, the experimental data was analyzed by using the method of time-domain analysis and frequency-domain analysis. The peak, RMS value and kurtosis value of the analysed fault signal were extracted and used to consider as the time-domain characteristic for fault diagnosis and condition monitoring.. And the time-domain characteristics was employed to judge whether the gearbox have faults or not. Determining the location of fault by watch and analyse the frequency domain graph of health signal and fault signal to verify the effectiveness of the algorithms...