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自行火炮总体结构参数的优化设计研究 被引量:12
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作者 毛保全 穆歌 《兵工学报》 EI CAS CSCD 北大核心 2003年第1期5-9,共5页
针对提高自行火炮的射击精度 ,本文提出了以减少炮口起始扰动为目标函数的自行火炮总体结构参数的优化设计问题 ,建立了自行火炮发射动力学模型及参数优化模型 ,并采用伴随变量法和拓广的状态空间梯度投影法对优化问题进行了求解 。
关键词 自行火炮 结构参数 优化设计 发射动学模型 运动学分析 主动力分析
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Comparative study of different theories on active earth pressure 被引量:1
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作者 S.P.Yap F.A.Salman S.M.Shirazi 《Journal of Central South University》 SCIE EI CAS 2012年第10期2933-2939,共7页
Determination of distribution and magnitude of active earth pressure is crucial in retaining wall designs. A number of analytical theories on active earth pressure were presented. Yet, there are limited studies on com... Determination of distribution and magnitude of active earth pressure is crucial in retaining wall designs. A number of analytical theories on active earth pressure were presented. Yet, there are limited studies on comparison between the theories. In this work, comparison between the theories with finite element analysis is done using the PLAXIS software. The comparative results show that in terms of distribution and magnitude of active earth pressure, RANKINE's theory possesses the highest match to the PLAXIS analysis. Parametric studies were also done to study the responses of active earth pressure distribution to varying parameters Increasing soil friction angle and wall friction causes decrease in active earth pressure. In contrast, active earth pressure increases with increasing soil unit weight and height of wall. RANK/NE's theory has the highest compatibility to finite element analysis among all theories, and utilization of this theory leads to proficient retaining wall design. 展开更多
关键词 active earth pressure retaining wall PLAXIS comparative study RANKINE's theory COULOMB's theory
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