Characteristics of ultracapacitor and classic model have been introduced in this paper. Due to its superior performance, ultracapacitor is used for hybrid energy storage system with lead-acid battery. The performance and potential application of hybrid energy storage system have been elaborated, which make some contribution to the promotion and application of energy storage technology.
The main objective of this work is to characterise the prop-rotor of V/STOL (Vertical/short-take-off and landing) aircraft in various operating conditions, especially in transition flight. To this end, a BET (Blade element theory) based analytic model/tool with a low computational cost has been built to predict the aerodynamic performance of the prop-rotor. This BET-based model can predict prop-rotor thrust, torque, normal force, and yaw moment as well as their corresponding 1P load (once-per-revolution load on the single blade) regarding oblique flow. This model is verified and shows good consistency with the wind tunnel experimental data and CFD simulation results. Furthermore, by using this BET model/tool, the effects of axial advance ratio, tilt angle and collective pitch angle on these component loads on the prop-rotor are explored. Moreover, the effects of these variables on the vibratory amplitudes of the 1P load on the single blade and 3P harmonic loads on the prop-rotor due to inclined flow are presented as well.
With the development of networks, the relationships between networks have also been increasingly intimate. It is envisioned that these interdependent networks are more vulnerable. In order to study the robustness of interdependent networks, in this paper, we characterize a load redistribution model based on distance and cascading failure model about interdependent communication network and power network. The failure model joined the load factor on the basis of the penetration model. We analyze the influence of different distribution distance threshold to interdependent networks. The simulation shows that global redistribution yields better performance and enough capacity cannot prevent cascading failure completely.
This paper presents a general view of the target tracking in Wireless Sensor Networks (WSN) with proper deployment of it. Target tracking task in WSN can be more accurately and efficiently accomplished, given the circumstance where the WSN is more proper deployed, for example, the coverage with clearer border and less holes, sensors with less movement, and connectivity well preserved. To prove this thought, several protocols of target tracking and various aspects of deployment in WSN are investigated.
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