In this paper, we incorporate fuzzy mathematics approach into the Eulerian method to simulate three dimensional multi-material interfaces. In particular, we propose a fuzzy interface treatment for describing interface...In this paper, we incorporate fuzzy mathematics approach into the Eulerian method to simulate three dimensional multi-material interfaces. In particular, we propose a fuzzy interface treatment for describing interfaces, designing transport plans, and computing transport quantities. Using a set of three-dimensional inviscid isothermal elastic-plastic hydrodynamic equations, we simulate shaped charge jet in different filled dynamite structures. Strain and stress have been under consideration in simulations. Numerical results demonstrate that the fuzzy interface treatment is correct and efficient for three-dimensional multi-material problems.展开更多
To improve the low-temperature charge-discharge performance of lithium-ion battery,low-temperature experiments of the charge-discharge characteristics of 35 Ah high-power lithium-ion batteries have been conducted,and ...To improve the low-temperature charge-discharge performance of lithium-ion battery,low-temperature experiments of the charge-discharge characteristics of 35 Ah high-power lithium-ion batteries have been conducted,and the wide-line metal film method for heating batteries is presented.At-40℃,heating and charge-discharge experiments have been performed on the battery pack.The results indicate the charge-discharge performance is substantially worse in cold climates,and can be significantly improved by heating the battery pack with a wide-line metal film.Pulse charge-discharge experiments show that at-40℃ambient temperature,the heated battery pack can charge or discharge at high current and offer almost80%power.展开更多
为探究柔性直流电缆的空间电荷特性,采用压力波(PWP)法模型电缆空间电荷测试系统,研究了30 k V柔性直流电缆在电场为-10、-15和-20 k V/mm,导体温度为30、50和70℃,以及在电场13.9 k V/mm下热循环过程中的空间电荷分布。结果表明:在试...为探究柔性直流电缆的空间电荷特性,采用压力波(PWP)法模型电缆空间电荷测试系统,研究了30 k V柔性直流电缆在电场为-10、-15和-20 k V/mm,导体温度为30、50和70℃,以及在电场13.9 k V/mm下热循环过程中的空间电荷分布。结果表明:在试验外加电场下,当电缆导体温度为30℃时,电缆绝缘层中几乎没有空间电荷积聚;当导体温度升高到50℃和70℃时,绝缘层两侧出现异极性空间电荷积聚,空间电荷密度随着导体温度和电场的升高而增大,且绝缘层外侧的空间电荷积累量大于绝缘层内侧;在电场为13.9 k V/mm的热循环过程中,柔直电缆绝缘层在加热阶段积聚的空间电荷在降温阶段不易消散。展开更多
基金the National Natural Science Foundation of China (Grant No.10272023).
文摘In this paper, we incorporate fuzzy mathematics approach into the Eulerian method to simulate three dimensional multi-material interfaces. In particular, we propose a fuzzy interface treatment for describing interfaces, designing transport plans, and computing transport quantities. Using a set of three-dimensional inviscid isothermal elastic-plastic hydrodynamic equations, we simulate shaped charge jet in different filled dynamite structures. Strain and stress have been under consideration in simulations. Numerical results demonstrate that the fuzzy interface treatment is correct and efficient for three-dimensional multi-material problems.
基金This work was supported by the defense preresearch project(104010108)the Fujian province natural science foundation(2014J01173)+1 种基金the key discipline of mechanical engineering in Fujian province(6112c1600)the Fujian province department of education(JA12100).
文摘To improve the low-temperature charge-discharge performance of lithium-ion battery,low-temperature experiments of the charge-discharge characteristics of 35 Ah high-power lithium-ion batteries have been conducted,and the wide-line metal film method for heating batteries is presented.At-40℃,heating and charge-discharge experiments have been performed on the battery pack.The results indicate the charge-discharge performance is substantially worse in cold climates,and can be significantly improved by heating the battery pack with a wide-line metal film.Pulse charge-discharge experiments show that at-40℃ambient temperature,the heated battery pack can charge or discharge at high current and offer almost80%power.
文摘为探究柔性直流电缆的空间电荷特性,采用压力波(PWP)法模型电缆空间电荷测试系统,研究了30 k V柔性直流电缆在电场为-10、-15和-20 k V/mm,导体温度为30、50和70℃,以及在电场13.9 k V/mm下热循环过程中的空间电荷分布。结果表明:在试验外加电场下,当电缆导体温度为30℃时,电缆绝缘层中几乎没有空间电荷积聚;当导体温度升高到50℃和70℃时,绝缘层两侧出现异极性空间电荷积聚,空间电荷密度随着导体温度和电场的升高而增大,且绝缘层外侧的空间电荷积累量大于绝缘层内侧;在电场为13.9 k V/mm的热循环过程中,柔直电缆绝缘层在加热阶段积聚的空间电荷在降温阶段不易消散。
