This paper begins with a consideration of the influence of feed per revolution upon the depth of a cut and the impact of the machining method on the direction of tool pressure average and subsequent description of eff...This paper begins with a consideration of the influence of feed per revolution upon the depth of a cut and the impact of the machining method on the direction of tool pressure average and subsequent description of efficient cutting directions and the methods for load cell orientation. The paper goes further into the key conclusions concerning the dependences of the cutting depth at high-speed milling as in the case of discontinuous functions. It ends with recommendations offered for positioning of load cells for cut-up milling and cut-down milling.展开更多
Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in t...Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in the upwinding algorithm for unstructured triangular meshes to improve the computed shock wave resolution. The solution accuracy is further improved by coupling an error estimation procedure to a remeshing algorithm that generates small elements in regions with large change of solution gradients, and at the same time, larger elements in other regions. The proposed scheme is further extended to achieve higher-order spatial and temporal solution accuracy. Efficiency of the combined procedure is evaluated by analyzing supersonic shocks and shock propagation behaviors for both the steady and unsteady high-speed compressible flows.展开更多
为降低储能电池组内各单体间不可避免的一致性差异,提出一种多阈值自适应聚类群组均衡控制方法。首先,引入结构简单、控制简单、均衡功能完善的单电感储能均衡拓扑,并分析了其均衡原理和控制信号占空比设计过程;其次,提出一种多阈值自...为降低储能电池组内各单体间不可避免的一致性差异,提出一种多阈值自适应聚类群组均衡控制方法。首先,引入结构简单、控制简单、均衡功能完善的单电感储能均衡拓扑,并分析了其均衡原理和控制信号占空比设计过程;其次,提出一种多阈值自适应聚类群组均衡控制方法,在引入自适应聚类均衡思想的同时,基于一致性差异较小的相邻单体建立群组均衡控制方法,实现均衡能量在包含不同个数相邻单体的电池群组间转移;最后,通过仿真实验,验证了所提多阈值自适应聚类群组均衡控制相比于基于极差的“单对单”均衡控制,在初始荷电状态(state of charge,SOC)分布中间高、两边低,两边高、中间低,均匀分布的情况下,在保证均衡效率的前提下,均衡速度分别提高了40.4%、24.6%和17.5%,并且均衡结束后各单体SOC相比于电池组平均SOC的离散程度更小。本工作创新了大数量单体构成的储能电池组的均衡思路,有助于改善储能电池组内各单体的一致性差异,提高其能量利用率及循环寿命,促进储能电池组的应用。展开更多
文摘This paper begins with a consideration of the influence of feed per revolution upon the depth of a cut and the impact of the machining method on the direction of tool pressure average and subsequent description of efficient cutting directions and the methods for load cell orientation. The paper goes further into the key conclusions concerning the dependences of the cutting depth at high-speed milling as in the case of discontinuous functions. It ends with recommendations offered for positioning of load cells for cut-up milling and cut-down milling.
文摘Adaptive Delaunay triangulation is combined with the cell-centered upwinding algorithm to analyze inviscid high-speed compressible flow problems. The multidimensional dissipation scheme was developed and included in the upwinding algorithm for unstructured triangular meshes to improve the computed shock wave resolution. The solution accuracy is further improved by coupling an error estimation procedure to a remeshing algorithm that generates small elements in regions with large change of solution gradients, and at the same time, larger elements in other regions. The proposed scheme is further extended to achieve higher-order spatial and temporal solution accuracy. Efficiency of the combined procedure is evaluated by analyzing supersonic shocks and shock propagation behaviors for both the steady and unsteady high-speed compressible flows.
文摘为降低储能电池组内各单体间不可避免的一致性差异,提出一种多阈值自适应聚类群组均衡控制方法。首先,引入结构简单、控制简单、均衡功能完善的单电感储能均衡拓扑,并分析了其均衡原理和控制信号占空比设计过程;其次,提出一种多阈值自适应聚类群组均衡控制方法,在引入自适应聚类均衡思想的同时,基于一致性差异较小的相邻单体建立群组均衡控制方法,实现均衡能量在包含不同个数相邻单体的电池群组间转移;最后,通过仿真实验,验证了所提多阈值自适应聚类群组均衡控制相比于基于极差的“单对单”均衡控制,在初始荷电状态(state of charge,SOC)分布中间高、两边低,两边高、中间低,均匀分布的情况下,在保证均衡效率的前提下,均衡速度分别提高了40.4%、24.6%和17.5%,并且均衡结束后各单体SOC相比于电池组平均SOC的离散程度更小。本工作创新了大数量单体构成的储能电池组的均衡思路,有助于改善储能电池组内各单体的一致性差异,提高其能量利用率及循环寿命,促进储能电池组的应用。
