A parameterized Doppler distorted matching model for periodic fault identification in locomotive bearing

The locomotive bearings support the whole weight of the train under the high speed and its continuous running is a key factor of the train safety. The collected Doppler distorted signal greatly increases the difficulties in detecting the whelmed fault information. To overcome this disadvantage, a novel Doppler distorted correlation matching model using the single side Laplace wavelet and acoustic theories is constructed to recognize the bearing fault-related impulse intervals. The parameterized Doppler distorted model is assessed by the correlation coefficient with the bearing fault signal in waveform. The optimal Doppler distorted model, that is the Doppler distorted correlation matching model which matches the fault component in the acoustic signal could be used for identifying the fault impulse interval. Then, the bearing fault can be successfully detected from the parameters of the Doppler distorted correlation matching model due to its maximum similarity to the real signal. Except for the simulation study, the proposed model is also employed to match the fault components in some real acoustic bearing fault signals. The recognized fault impulse period in the Doppler distorted correlation matching model’s initial model keep in good accordance with the correct fault impacts, which represent the locomotive bearing fault characteristics.

The Study of the Processing Method of Room Temperature Vulcanized Silicone Rubber (RTV) on the Surface of the Locomotive Bearing Seal Rings

The experimental research is confirmed the method about the residual room temperature vulcanized Silicone Rubber (RTV) on the surface of the locomotive bearings after dismantling. The Alkaline inorganic solution has no actual effect on the RTV soaking. While the carbinol and xylene organic solution have alittle effect of dissolving for the RTV on the locomotive bearing seal rings, and both reduce elasticity and function of the seal rings. After long time soaking with the acetonum solution and polishing by hand, It can clean up all the RTV, and the seal ring has no effect on it.

Study on Injecting Forming Technology of Railway Locomotive Bearing Retainer

According to the superiority performance, the applications of engineering plastics tend to be widely used day by day in the field of railway transport. The research of locomotive-bearing retainer is an important technology that should be resolved proposed by the Ministry of Railways’ report on the outline of the Eleventh Five-Year Plan. In this paper, the characteristics of each process of the injection molding in the different stage, the main technology parameters, and the influence of the primary process parameters on the part manufacture quality were systematically analyzed. And the modern injecting forming software and new technology were applied to analyze the injecting forming technology, to design the mould structure, to forecast the possible defects and breakdown in the process of injecting forming with the thematically design and the CAE technology. The study results can be extended to the design of other similar parts, which has very strong engineering applications significance.