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In this paper, the BGA solder joint is considered as the object of study. A fatigue life prediction model based on energy conservation law is constructed by reasonable assumptions. Energy-based life prediction model can avoid the analysis of various complex damage mechanisms in fatigue process, and only use energy as a measure. The mechanical response of BGA solder joint under temperature cycling...
The distribution system voltage volatility caused by changing load conditions and penetration of renewable resources presents an increasing challenge in the grid integration of renewables. This paper presents a novel voltage regulator, or field upgradeable transformer (FUT), for the distribution system, targeting at direct voltage regulation at the customer side with a fast dynamic response. Proposed...
In this paper, a partial response (PR) maximum likelihood equalization which is different from conventional decision feedback equalization (DFE) is explored for heavy loss channels of high speed serial link systems. By setting the PR coefficients equal to that of DFE, a good PR can be obtained. In addition, compared to the symbol and symbol detection (SSD) based DFE, PRML sequence detection can obtain...
Generalized Lloyd algorithm (GLA) is one of the most well-known image compression algorithms for the codebook generation problem of vector quantization. However, it is usually extremely sensitive to the initial solution. Thus, this paper presents an enhanced method that leverages the strength of two methods to create a better initial solution for the codebook generation problem. The simulation results...
In this paper, a consensus algorithm with input constraints for swarm robots was introduced. The stability of the algorithm was proved via Lyapnov stability criterion. The algorithm of aggregation and dispersion behavior with input constraints was established by applying the algorithm to formation control. The simulation results of swarm robots formation control showed that the converge rate of the...
Electrical power systems in electrical vehicles require high energy density sources such as battery-ultracapacitor hybrid storage system. In order to draw energy from the source as well as recharging the ultra-capacitor during regenerative breaking, a dual-bridge series resonant DC-to-DC converter with modified gating scheme is proposed. The switches on the primary side of the transformer are controlled...
Machine-to-Machine (M2M) communicationsaims to enablemachines to communicate with each other withouthuman intervention. The M2M traffic is quite different from Human-to-Human (H2H) traffic. Discontinuous reception (DRX) isone of the promising technologies for energy saving in LTE-A networks. The existing works on DRX pay more attention to H2H traffic, especially focusing on DRX in RRC active mode...
A nonlinear simulation model of switched reluctance linear launcher drive based on MATLAB platform is presented in this paper. It consists of a three-phase 6/4 structure simple side switched reluctance linear motor, a three-phase asymmetric bridge power converter, and a closed-loop velocity controller, which is integrated with the magnetization curves of the switched reluctance linear motor obtained...
Wireless sensor networks observe the occurrences of concerned events by the collaboration between sensor nodes via wireless communication. Sensors are usually prone to errors due to the unstable conditions they are exposed to. The goal is to solve event boundary detection with faulty sensors (EBDF) problem which is to successfully identify the sensor nodes close to the event boundary when faulty sensors...
It comes out to be the first problem needs to be resolved for wireless sensor networks, that is, to make data acquisition at a lower energy consumption but with high reliability on transmission. So, a reliable transmission protocol with dynamic adjustment for caching position is presented in this paper, which makes a good compromise between transmission reliability and energy consumption. This protocol...
The paper presented a control scheme for parallel drive system of double Switched Reluctance machines. The sliding mode control algorithm is adopted in the main controller for closed-loop rotor speed control of main machine. The sliding mode control algorithm is also adopted in the subordinate controller for synchronized rotor speed and loads equilibrium distribution between main machine and subordinate...
The design and realization method of fuel systems simulation is introduced in this paper. It is based on components. It is used for fuel system design,operational flow analysis and decision-making assistant. At first, visual controls of several devices in fuel systems are constructed using ActiveX technology. Then these visual controls are built together for real fuel system. With this method, this...
The P2P flows have occupied the dominating network bandwidth in current Internet and have increased the operation cost of ISP due to abundant flows between different ISPs. An important issue under research is how to make P2P be ISP-friendliness when they are competing with other applications. In this paper, we take BitTorrent as a popular P2P application example and propose a scheme based on ISP cooperation...
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