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High precision results in structural with the shortest time consumption are expected when methods are introduced to solve FEM(Finite element method). Solving of stiffness matrix assembled by isoparametric elements and solving the assembled stiffness matrix are the most time-consuming. In the previous serial algorithms, there is always a time limitation for some applications and it is hard to achieve...
Differential equation is a useful way to describe nonlinear systems. In general, integration is used to solve them, which is a forward method using current information to get the future information. In some special occasions where the system has a fix final condition and a free initial condition, a new kind of integration method with a backward direction is needed. This paper presents a new kind of...
We prove the multiple messages semantically security of the somewhat homomorphic private-key scheme presented by van Dijk et al. And convert it into a public-key scheme by using Ron Rothblum's transformation. The initial noise in the scheme is more smaller than that in Coron's. And can also convert it into a FHE in the ways described by van Dijk.
A low-grade heat power generation system with an ejector (LGHPGE) was proposed based on the conventional Rankine power generation system (RPGS) to increase the low-grade heat source (LGHS) power generation capacity and improve energy efficiency in this paper. In the LGHPGE, an ejector and a second-stage steam generator were added to the RPGS. By the ejector, the turbine backpressure could be reduced,...
A system of Solar-Ground Coupled Heat Pump with Energy Storage (SGCHPES) was built with space heating, air conditioning and hot water. The energy storage comprised Seasonal Storage in soil and Phase Change Heat Storage in the SGCHPES system. The operation modes of the SGCHPES system and the energy use in solar and ground energy were obtained in different seasons and different operation modes. Based...
An adaptive inverse controller is proposed for the flight control of a generic hypersonic vehicle. Other than conventional adaptive inverse control which adopt NARX algorithm, the proposed controller only use the input data and the change of the states to identify the inverse of plant. The improvement can reduce the input and output of the adaptive inverse filter, and improve the real-time performance...
The present study explores numerically the process of melting of phase-change material in a square annulus. Transient numerical simulations are performed with the constant tube wall temperature and the adiabatic shell. Temperature distributions, detailed phase fields within the melt, melt fraction and heat flux at the heating surface are presented and discussed. These simulations show the melting...
An experimental study on the intermittent operative characteristics of a ground-coupled heat pump in heating mode was performed. The inlet and outlet temperature variations of buried coil evaporator and condenser are presented. The results show that the intermittent operation mode can minify the decreasing of ground temperature and heighten the temperature of fluid entering heat pump, thus it can...
A numerical study of melting process of a phase change material contained in a square cavity heated from different surface is presented. The characteristics of phase change interface and melt fraction varied with time are studied. The dominated modes of heat transfer by different heating surfaces are presented and discussed. The results show that the conduction mode of heat transfer is dominant throughout...
The present study explores experimentally the characteristics of heat charging and discharging in a finned-tubes phase change heat storage system. The motivation of this study is to design and construct a novel storage system responding to charging and discharging characteristics of the system. The PCM is stored in the space between a cluster of finned tubes through which the heat transfer fluid (HTF),...
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