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Strain burst violence is related to the stiffness ratio (SR) between environmental and bursting rock masses. Strain burst tests on dolomite specimens with different system stiffnesses and bedded sandstone with four different dip angles as well as numerical analyses of strain burst with different structures are carried out to study the effect of stiffness on strain burst. Results indicate that strain...
Rockburst is a type of violent failure in underground rock engineering. Where a rockburst may happen and whether it will happen not only depend on the stress condition but also are related to the system stiffness. Homogeneity of the rock material is just a factor may affect the system stiffness. Based on numerical analysis, this paper compared the different failure modes, AE counts, AE energy and...
De-Noising of the vibration signal is the key to improve the accuracy of fault diagnosis. A new method of De-Noising based on Empirical Mode Decomposition (EMD) has been proposed. This method overcome the defect that traditional time domain or frequency domain filters need to determine the window function of shape and position by using the filter generated from its own signal. De-Noising processes...
To open suction slots in arc and back-arc face of hollow stationary blade at suitable place, using the pressure difference between inside and outside of the slot, is one of the most direct and effective to protect the moving blades from water erosion. By using the FLUENT software, this article conducted the numerical simulation to the steam flow field of LP last stage, which is opened with a suction...
High-capacity, low inlet parameters and huge flow are the characteristics of the nuclear steam turbine. As a result of adopting saturation steam and long blade, water erosion of last stage blade become more prominent. The secondary droplets' continuously dynamic impact to the movable vanes in the wake of hollow stationary blade is the main reason for water erosion. So, it is necessary to research...
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