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An orthogonal experimental scheme is designed for analyzing the powertrain system based on GT-drive. What extent of engine, gear-box and final drive influence on dynamic and economic performance of vehicle is presented respectively; hence, we can get An optimal matching option is get by comparing the results under different schemes. The effectiveness of this method is proven by real experiment.
The vacuum circuit breakers are used to switch shunt capacitors which are used as a reactive compensator. Due to capacitors' energy storage characteristic and asynchronous closing of vacuum circuit breakers, system will produce high overvoltage during switching off the shunt capacitors especially when a beaker is restriked. It's harmful to the insulation and lifecircle of the equipments and even threatens...
There has not been an effective simulation and analysis method for the prediction of the reliability of monitoring system for a long time. This paper uses the cloud model theory and fault tree analysis (FTA) to transform elements that affect the reliability of the monitoring system, such as temperature, humidity, voltage, and stress of parts, into environmental factors, in order to obtain a new method...
In the Life-Cycle of construction project, there had been lots of participant organization join in project for construction and quit project organization system when the job was done, so there must been project organization variation. It is difficult to find a single standard to estimate different kinds of organization operation of construction engineering project due to particularity and variation...
Heat transport has been recognized as a hydrologic tracer to indentify surface water infiltration and the exchange of surface water and groundwater. This paper investigates the heat transport with groundwater movement in coastal aquifers under tidal conditions. The aquifer vertically terminates at coastline with a thin submarine outlet-capping. Firstly, the time averaged analytical solution of tide-induced...
For the impact of climate change and strong human activities, the amount and distribution of precipitation in Haihe river basin has changed greatly in recent years. The Regional Climate Model 3(RegCM3) is a useful model for simulating the atmosphere environment with physical and chemical mechanisms. In this article, the precipitation in Haihe river basin from 1991 to 2000 is simulated by the RegCM3...
Spatial load forecasting hinges on choosing suitable load density. Because of load density is influenced by many uncertain factors, taking various objective factors into account on the basis of expert experience judgment will be a great help to improve the precision of forecasting load density. The selection of load density bases on a large number of samples. This paper establishes cloud generator...
Based on PSCAD/EMTDC, the authors build a harmonic analysis model for a bi-pole dual 12-pulse ±1000kV Ultra-High Voltage Direct Current (UHVDC) converter and the interconnected AC system. The control strategy for UHVDC employs the current margin control from CIGRE HVDC Benchmark. The AC system includes the equipments above 500kV and the equivalent circuit under 500kV. The harmonic interaction of DC...
Pedestrian traffic system is a stochastic dynamic system with uncertainty cluster density, non-linear and the interaction among the individuals. Now computer dynamic simulation is one of the effective methods to study the mechanical characteristics of pedestrian flow in the public buildings. Aimed at the problems that under the same scene different software tools used in pedestrian simulation may...
This paper proposes a new and practical model to achieve the electricity market equilibrium based on Linear Supply Function Equilibrium (LSFE) model. In the proposed model, the transmission constraint in addition to the generation constraint and the consumers bidding behavior are considered. The coevolutionary computational approach is proposed to solve the market equilibrium problem. Several cases...
A concept named 'steady process in transient condition' is proposed for transmission line based on the transient expression of electromagnetic traveling wave. Considering the impact of distributed parameters and the characteristics of electro-magnetic wave, the transmission line model is built. Wave impedance factor is defined with line voltage fluctuation. The voltage equation is derived and the...
This paper studied the relationship between industrial elements input and cluster-benefit, took Shandong province's and Zhejiang province's textile industry as an example, analyzed the data from 2000-2007 of the two provinces with scale sensitivity model. We found that investment and benefit in Zhejiang's textile industry are inconsistent, the element affects most is unit value of liquid assets. Further...
A dynamic equivalent approach based on coherency is researched for dynamic simulation test in ±800 kV DC transmission project from Yunnan to Guangdong in China. To reduce the full system, the dynamic equivalent model of large-scale power system based on coherency is established, in which the identification of coherent generator groups, coherent buses reduction, aggregation coherent generator parameters...
There is a good correlation fractal value of high complexity and fault systems. Generally have higher value, fault systems of fractal dimension in fracture length, smaller, branch, tectonic deformation and fracture large extent. Otherwise, the fault systems have lower fractal dimension. Through the different methods of fractal dimension is different, have different meaning in the same place. In this...
Smart Grid is gradually prevalent to human's daily life. More customers hope their home grids smarter to realize energy saving, intelligent controlling and real-time monitoring. The advent of Home Area Network (HAN) supported by multiple IEEE network technologies makes the thinking true together with difficulties and challenges on the field designs and assignments. Simulation is important for analysis...
Study and analysis the fuel leakage security of current LNG alternative fuel bus. Do the simulation on surrounding concentration and temperature of LNG bus fuel tank leakage by Computational Fluid Dynamics (CFD). By analyzing the influence of three different bus velocities, 0km/h, 30km/h and 80km/h, we have the conclusion from the simulation that when the bus gets faster, the influence of surrounding...
By the introduction on the type of the PPP model, this paper analysis the advantage and necessity for adopting PPP in infrastructural facilities and public service, and based on practical project experience, it presents three new models on the PPP model sustainability: content classification model, multi-stage model and community model. At the end part this paper briefly summarizes the obstructions...
Global weather condition is deteriorating, and the impacts on the transmission and distribution system are more and more serious. Therefore it is especially important to take the reliability impact assessment of the grid considering the weather factors. This article will divide the weather state into normal weather, bad weather and catastrophic weather, and establish the power system reliability evaluation...
In literature, variable speed control of belt conveyors is recommended to save energy consumption. However, the current implementations mostly focus on lower level control loops without operational considerations at the system level. This paper intends to take a model based optimization approach to improve the operation efficiency of belt conveyors with consideration of various constraints. Specifically,...
A reliability predication method based on GO methodology for fuel cycling system (FCS) in pebble bed reactor is introduced. Regarding to the specific structure and function of the FCS, the probability of FCS was defined. By using decomposition and reconstruction the probability of complex bridging system was calculated directly, some new operators and corresponding algorithm were derived. The comparison...
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