The manufacture core of CRH380 high-speed train is aluminum alloy welding technology. However, welding residual distortion which occurs in welding process brings unfavorable effect on the quality of high-speed train. As a result, welding distortion forecasting and control become an important and urgent research topic in railway vehicles. Using equivalent thermal load method based on inherent strain given by the formulae, the welding distortion of aluminum alloy side-wall was predicted by an Elastic FEM which consider actual welding conditions. The simulation results were compared with experimentally measured data to evaluate the validity of the model and to verify effectiveness of this method for large-scale welding structure which had long seams.
Wheel/rail rolling noise is the main source of noise from railway operations, it is at least
as important as aerodynamic noise. In this paper, the makeup of unit modules of CAE(Computer
Aided Engineering) simulation platform for of railway passenger car and its function frame are
given. Based on finite element method, boundary element method, the structural model, interior
acoustic cavity and acoustics model of electric locomotive wheel were analyzed by Nastran and
Sysnoise software. This paper is imposed sinusoidal excitation on the wheel, and then the laying of
the viscoelastic layer and optimization of damping-wheel, obtain the wheel’s structure of the
vibration noise radiation.The analysis result shows that the laying of the viscoelastic layer can
reduce wheels radiation noise, and the noise can be reduced from 0.27 to 8.62 dB.Practical
application indicated this simulation platform can supply effective technology support for the
development of product.
The Qinghe and Fanhe basin in Tieling, Liaoning were studied as case in this sduty. The COD emission reduction was assigned by the method of information entropy and the Gini coefficient method first. Then the correlation between the calculation methods and the water environmental quality was analyzed. Finally, the best method of reduction calculation was identified. The results showed that the information entropy method was a better method in total allocation because it was highly correlated with water environment quality,at the same time it combined the pollution reduction and water environment quality management better. The results also showed the COD reduction in Qinghe basin was larger than Fanhe basin, so the Qinghe basin was the focus of emission reduction.
Key words: Information entropy method;Gini coefficient method;COD emission reduction assignment;Correlation
Bolts as the key connection parts are directly related to the safety of high-speed train. Contact nonlinear static strength of CRH (China Railway High-Speed) coupler bolt was analyzed on traction and compression load with ANSYS software. According to maximum stress of bolts was appeared on tension load, CRH bolt strength was evaluated and compared based on three methods: finite element analysis (FEA), "Verein Deutscher Ingenieure 2230 standard (VDI 2230)" and “Mechanical Design Handbook”. The results show that the axial tensile stress is much greater than the shear stress and gradually increase with three methods.
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