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Foreign trade container shipping have two modes, one is Full container Loading(FCL) shipping, another is Less container Loading(LCL) shipping. I have Used logit choice model, using MATLAB to calculate survey datum, the result is foreign trade container shipping mode is mainly relationship with the cargo volumes, when it is smaller than 15m3,it will choice LCL shipping. Although fees affect the choice,...
According to voice of engineering, 3 dimensional condensation boundary element method is used to solve multi-body frictional elastic contact problem. Frictional elastic contact problems belong to local nonlinearity problems, the relative sliding of contact face gives rise to energy dissipation, in this paper, incremental method is adopted to trace the whole course of loading, condensation method is...
In the paper, an overall dynamic mathematical model of a 260t/h circulating fluidized bed (CFB) boiler was described, which included the sub-system mathematical models of the combustion chamber, the cyclone separator and the back-feeder in the 260t/h CFB boiler. Based on the mathematical models, using the SIMUCAD platform, a simulation environment of the boiler was developed, which can simulate the...
Usually, the control method with voltage and current PI regulators in synchronous rotating frame is applied to three-phase voltage source PWM rectifier. It is easy to generate inrush current during startup period. A slow ramp reference current is commonly used to achieve the soft starting, but not quite effective. The paper first analyzed the cause of inrush current and obtained the shortcomings of...
A three-dimensional computation model for analyzing the strip hot rolling is presented, which consists of a series of separated models. To take account of the complicated interactions among thermal, mechanical and metallurgical phenomena in rolled metal, models for analysis of these three physical processes respectively are full coupled through iterative procedures. Simulations of strip hot rolling...
Based on three-dimensional elastic contact boundary element method, bearing rollers are described as plate-units and placed on the inner race which is placed on mill roll, and outer race is placed on shaft block, therefore, the multi-body contact problem can be simplified to two bodies contact problem. Sub-elements and micro-elements are used to realize the discontinuous distribution of surface force...
A coupled mathematical model based on dislocation theory is presented in the paper. It is applied to evaluation of the dynamic recrystallization kinetics using optimization method. The model does not distinguish different kinds of recrystallization, which are considered as the same process rooted in nucleation and grain growth. And the dynamic recrystallization fraction is related to the flow stress...
The paper presents an improved single neuron-based adaptive PI controller (SNPI) designed for regulating a heating, ventilation and air-conditioning (HVAC) system in a test room, which can be represented by a First-order-plus-dead-time (FOPDT) model. The characteristics including nonlinear and time-varying dynamics in HVAC systems have been considered. By using an improved learning algorithm, which...
Several spatiotemporal patterns: random spots, hexagon pattern, coexistences of hexagon and square pattern, and square pattern are obtained in dielectric barrier discharge system while increasing the voltage with other parameters fixed. By using image processing including spatial correlation function and Fourier spectrum, the structures of patterns and the bifurcation scenario are studied. It is shown...
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