Papers by Author: Han Xiao

Abstract: Due to limited land resources, spaces under bridge were illegally under used in many cities. Great hazards were existed in such used under bridge spaces. In this article, a certain bridge space was studied, time history curve for the room temperature was obtained by CFD simulation according to the hydrodynamic theory, and the data turned out to be reliable by being compared to the experimental outcomes.

Abstract: In this paper, one certain space under bridge which was used as a storehouse has been simulated numerically. The flow was considered turbulent and buoyant. A simple geometry was adopted, consisting of a room with a door that plays the role of inlet and another of outlet for the air. Four bundles of wood burners which considered as a volumetric heat source were placed evenly in the space. The problem was simulated by using the RNG K-ε turbulence model, modified to account for buoyancy effects. Several useful results were obtained.

Abstract: Spring pendulum with single-frequency excitation can be expressed in a group of complicated nonlinear equations. Bifurcation of the spring pendulum with single-frequency is studied in this paper, feedback controllers are designed, analysis method is used to obtain the control equation of excited system, and the relationship function between control parameters and bifurcation is gained. This acts as an implementation of feedback control method to saddle-node bifurcation control, and also brings average method to numerical calculation of multiple-degree-of-freedom nonlinear system.