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In this paper a new DT-based adaptive BLUE is proposed to overcome the shortcoming of BLUE. The buffer is managed by dynamic threshold algorithm. The packet-dropping probability is determined by packet loss event, link idle event and the buffer usage ratio. The simulation results prove that the proposed approach can effectively stabilize the queue occupation at a level and improve link utilization...
A high-voltage LED driver using Silicon-on-Insulator (SOI) technology is presented in this paper. The presented LED driver has a wide input range from 40V to 625V, and could be used in tens to a hundred series LED applications. This driver works in peak current control mode, which provides two dimming functions: linear dimming and PWM dimming. The output current requirement could be fulfilled by adjusting...
A new water quality model calibration method using pfmGA (parallel fast messy genetic algorithm )was presented by adopting parallel mechanism of fmGA (fast messy genetic algorithm )in allusion to the disadvantage that traditional calibration method lies on experience, waste time and fmGA can be only adopted in small scale water distribution system. It deals with calibration of the model, gives general...
In order to analyze the characteristics of the transcritical CO2 heat pump system with throttle valve, it is necessary to simulate and further to optimize control the system operation. Therefore, the mathematical model for this system is developed in this paper. The simulation values are validated by the test data. The results show that the average error for cooling coefficient of performance (COP)...
Taking sealed boxes as the research object, the author analyzes the main source of its moisture content. Based on the permeability mechanism of the sealed boxes and the moisture mechanism of the items inside the boxes, the paper establishes the mathematical model of the relative humidity inside changing over time, applying MATLAB to make a simulation analysis of the mathematical model. The simulation...
The tuned harmonic filter in series with the neutral line is an effective method for zero-sequence harmonic mitigation. However, the series tuned filter not only has the de-tuning problem but also inject fundamental impedance into the neutral line. In order to mitigate those negative effects, a continuous auto-tuning zero-sequence harmonic filter based on an active reactor was presented in this paper...
In view of the shortage of numerical control(NC) teaching resources and some problems such as high cost and high risk of equipment in current NC training area, with the rapid development of virtual reality, computer network and human-computer interaction technology, a feasible programme of virtual NC simulation system based on browser/server(B/S) was brought forward. Firstly, the development platforms...
This paper focused on modeling and performance analysis of linear inverted pendulum and design and simulation of LQR controller. Main to introduce how to built the mathematic model and the analysis of it's system performance, then design a LQR controller in order to get the much better control. Simulation is done to show the efficiency and feasibility of proposed approach.
Currently the study of static and dynamic characteristics about large-scale machine equipment, are worked mainly by means of computer' calculation and simulation. In this paper, on the bases of the large belt conveyor design system' development and research, propose to design a architecture for large-scale machine device simulation system, and discuss it's practical value and far-reaching significance,...
Because of the virtue mobility, flexibility, and convenience, more and more wireless network are used in our everyday life. During the move between two scales of different AP (Access Point), the quality of the services heavily depends on the seamless handoff scheme which provide less packet lost. There are many people propose lots of strategies to reduce packet lost and do many contribution to it...
This research proposed a novel planar magnetic bearing, the planar magnetic bearing system includes a thrust portion and a suspension portion. Aim at the strong coupling character of thrust portion, We used the auto-disturbance rejection controller to observe the inner and outside disturbance, and to achieve decoupling between the degrees of freedom. The result of research shows that the thrust control...
In order to achieve the sustainable development in multi-span plastic covered greenhouse with high production efficiency, it was this research that established the mathematical model of the environment for cucumber production in coupling with the biological model of it, by making use of the knowledge of heat transfer, thermodynamics and the principle of energy balance as the research platform. The...
In order to analyze the dynamic performance and estimate fuel cost of automobile in the city streets, a simulation model of automobile is constructed and examined. Then the driver comfort is optimized by using this model. To better evaluate the driving characteristics of automobile in the city, the fuzzy logic method simulating the driver's handing process is introduced. A few fuzzy driving rules...
The Dynamic Voltage Restorer (DVR) as an electronics based custom device, is used to protect sensitive loads from the voltage sags in the power distribution system. With the rapid technology advancement in industrial control processes, it is experiencing more demanding requirements on how to compensate voltage sags with minimum power consummation. That's why in this paper, energy cost optimal compensation...
Shaft diameter variation is the common procedure in construction of wellbore. Wall rock destruction will intensify with the change of shaft diameter. By modeling and simulation of the destruction in shaft diameter variation area which was changed quickly, it indicates that the mutation of surrounding rock mass and the stress concentration area is significantly larger than changed slowly, which was...
A hybrid algorithm -RFN network of self-adaptive genetic algorithm was introduced, which combined the excellences of BP network, RFN network and genetic algorithm. The hybrid algorithm adopts the learning rule of RFN network and combines self-adaptive genetic algorithm and gradient descent method. The capability of prediction can be optimized using the hybrid algorithm and the shortcoming of the learning...
This paper analyzes the reason why the IEEE 802.11 DCF (distributed coordination function) mode results in TCP unfairness performance by comparing medium access characteristics of wired networks with those of wireless ad hoc networks. Then it looses the channel allocation preserve-based mechanism and discards the binary exponential backoff (BEB) algorithm, and proposes a new p-parameter adjust algorithm...
Coke oven heating system is the large inertia, nonlinear, time delay, time-varying coupling and models difficult to accurately establish characteristics. A feedforward, feedback and combination of fuzzy adaptive PID control strategy is proposed. A fuzzy controller is designed to achieve. The controller has three kinds of control over the advantages. Coke oven heating system for fast response, anti-disturbance...
This article firstly describes the principle of control strategy and puts forward a torque-balancing control strategy for the hybrid electric public bus. Based on the designed control strategies, the simulations are carried out and the results are analyzed under different conditions, and the torque-balancing control strategy was improved on the basis of the efficiency-first ideas of the hybrid system...
The Insulated Gate Bipolar Transistor(IGBT) is simulated with the proposed unique sub_circuit model, its temperature dependence was implemented in the model. The IGBT wide base conductivity modulated resistor is effectively equivalent by a voltage controlled resistor. This sub_circuit model includes a detailed ambipolar transport analysis of the wide base, low gain, high_level injection bipolar transistor...
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