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新型的三维板方法分析层合板弯曲问题
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作者 王伟 沈纪苹 +1 位作者 伊士超 姚林泉 《南通大学学报(自然科学版)》 CAS 2015年第3期83-94,共12页
在层合板弯曲问题的数值模拟过程中,经常会采用不同假设理论来近似和简化处理,包括经典层合板理论、一阶剪切理论、三阶剪切理论等高阶剪切理论,这些理论都有各自的优缺点.基于方向的无网格和有限元耦合的三维板方法,即在板厚度方向的... 在层合板弯曲问题的数值模拟过程中,经常会采用不同假设理论来近似和简化处理,包括经典层合板理论、一阶剪切理论、三阶剪切理论等高阶剪切理论,这些理论都有各自的优缺点.基于方向的无网格和有限元耦合的三维板方法,即在板厚度方向的各子层内使用满足C0连续性的有限元近似,而在板的面内方向使用基于径向基插值的无网格近似,无需事先假设横向剪切理论,是一种新型的三维板方法,它采用的位移近似理论能够呈现整体满足连续性的位移和各面内应变分量,及满足"层间不连续性"的各剪切应变分量,为得到"层间连续性"的各剪切应力分量提供了可能性.然后,通过面内的二维节点离散及"映射技术"较快捷地实现三维位移场的近似,并利用三维的几何关系和物理关系分别构造应变场、应力场近似.同时具有插值性的耦合位移近似使得能够方便地施加本质边界条件.基于最小势能原理,利用无单元Galerkin法建立系统离散代数方程组.通过分析数值结果,探讨该方法在实现过程中可能出现的各种自锁现象,并给出解决自锁的方案.最后,通过数值算例验证了它的有效性和高精度. 展开更多
关键词 三维板方法 无单元Galerin法 径向点插值 层合弯曲 自锁现象
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Method of 3D Solar Energy Conversion
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作者 Valeri I. Kotelnikov Elena A. Ryazanova 《Journal of Mechanics Engineering and Automation》 2016年第4期212-216,共5页
The problem of collecting solar energy and increasing its efficiency was studied in this paper. It was discovered that a 3DPV (three-dimensional photovoltaic) structures can generate greater amounts of measured ener... The problem of collecting solar energy and increasing its efficiency was studied in this paper. It was discovered that a 3DPV (three-dimensional photovoltaic) structures can generate greater amounts of measured energy densities than stationary flat PV panels (rate: 2 to 20). It has been found that the same structures work better not only because they are made in 3D but because PV panels do not have linear dependency on geometry. It seems that the conversion efficiency depends on the process of absorption of the solar energy, too, or in other words on the E. Yablonovich limit. The findings suggest that the quantity of material of solar panels may be reduced to generate the same amount of electricity. 展开更多
关键词 Solar energy EFFICIENCY photovoltaic technology electricity generation energy transmission.
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