Papers by Author: Xin Yong Xu

Abstract: Basing on the theory of power flow, frequency response analysis was acted on in a hydropower house under dominant frequency with measured data of Three Gorges Station in spiral case and draft tube. Power flow in walls was calculated by APDL procedure and the properties were analyzed. The conclusion is that longitudinal wave is the main method in walls of the powerhouse, energy is reflected and stacked at the top of the walls. Displacement along the river changes and power flow in walls decays obviously. Intensity of vibration origin and distance between the vibration and the wall are both the influencing factors，increasing the stiffness of buttressed walls takes the role of limiting flexural wave and shear wave effect

Abstract: Based on the plastic damage model for concrete, this paper realizes the simulated construction for the preloading filling spiral case (PSC) in a hydraulic plant. The contact property and state are analyzed with the nonlinear FEM. The distribution of damage and stress with construction are given. The development mechanism of initial gap is studied. The effect of plastic damage on asymmetry displacement is researched. It is concluded that the influence is remarkable.

Abstract: The transient temperature field and creep of concrete surrounding a spiral case are analyzed with a three-dimensional method, based on ABAQUS. The mechanism of hydration heat and cooling pipes on temperature is studied. The distribution of temperature with construction is given. The effect of temperature on gap between steel liner and concrete is researched. It is concluded that the influence of the measure parameters and temperature is indispensable.