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空间斜平面弯管轴线几何参数的矢量计算法
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作者 蔡江碧 《西北农业大学学报》 CSCD 1995年第1期54-58,共5页
提出用矢量法计算空间斜平面弯管轴线几何参数的简捷方法,推导出计算管轴线参数、弯管段设计参数和施工放线参数的所有公式。并给出一实用设计例。
关键词 空间斜平面 弯管轴线 矢量计算 水电站
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多分支三维水平井轨迹设计 被引量:5
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作者 向亮 付建红 +3 位作者 杨志彬 土林 车争安 王建 《石油钻采工艺》 CAS CSCD 北大核心 2009年第6期23-26,共4页
针对分支井的三维轨迹特性,采用空间解析几何的方法建立了三维空间斜平面内水平井轨迹设计计算模型,根据推导出的轨迹设计模型编制了轨迹设计软件,该软件可以计算出轨迹设计的分段数据。经过测试,该轨迹设计软件计算出了预期的数据,这... 针对分支井的三维轨迹特性,采用空间解析几何的方法建立了三维空间斜平面内水平井轨迹设计计算模型,根据推导出的轨迹设计模型编制了轨迹设计软件,该软件可以计算出轨迹设计的分段数据。经过测试,该轨迹设计软件计算出了预期的数据,这些结果为可视化三维轨迹设计提供了数据支持。同时该研究成果也可广泛应用于分支井、定向井、水平井、以及大位移井的设计计算。 展开更多
关键词 分支井 三维水平井 轨迹设计 空间斜平面
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Three-dimensional Scattering of Obliquely Incident Plane SH Waves by an Alluvial Valley in a Layered Half-space
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作者 Liang Jianwen Mei Xiongyi Ba Zhenning 《Earthquake Research in China》 2013年第4期501-511,共11页
The indirect boundary element method (IBEM) is used to study three-dimensional scattering of obliquely incident plane SH waves by an alluvial valley embedded in a layered half-space. The free-field response of the l... The indirect boundary element method (IBEM) is used to study three-dimensional scattering of obliquely incident plane SH waves by an alluvial valley embedded in a layered half-space. The free-field response of the layered half-space is calculated by the direct stiffness method, and dynamic Green's functions of moving distributed loads acting on inclined lines in a layered half-space are calculated to simulate the scattering wave field. The presented method yields very accurate results since the three-dimensional dynamic stiffness matrix is exact and the moving distributed loads can act directly on the valley boundary without singularity. Numerical results and analyses are performed for amplification of obliquely incident plane SH waves around an alluvial valley in a uniform half-space and in single layer over half-space. The results show that the three-dimensional responses are distinctly different from the two-dimensional responses, and the displacement amplitudes around alluvial valleys in a uniform haft-space are obviously different from those in a layered half-space. 展开更多
关键词 Three-dimensional scattering Alluvial valley Plane SH waves Layered half-space Obliquely incidence
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