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蚯蚓蠕动过程中非光滑波纹形体表的力学分析 总被引:4,自引:0,他引:4
蚯蚓体表的形状是蚯蚓适应其生存环境和自然进化的结果.用力学分析方法,解释蚯蚓的多体节非光滑形态在其运动过程中所表现出的省力、节省能量的特性.计算结果表明具有波纹形表面的蚯蚓在蠕动过程中可以节省1.12%的纵向肌肉的收缩力,在运动过程中所消耗的能量也可以节省1%左右. 相似文献
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泄洪雨雾入渗导致边坡变形进而影响边坡稳定性的问题已成水电建设的重要工程问题之一。针对西南某水电站溢洪道陡槽段边坡挤压错动带发育、节理裂隙和控制性结构面发育等结构特点,分析该边坡开挖支护后泄洪雾化条件下潜在失稳的边界条件及变形破坏模式。根据边坡所处的地质环境条件,从泄洪雾化对边坡岩体的作用机制入手,得到了雨雾对该边坡稳定性的影响主要为雨雾沿着顺倾坡外拉裂面入渗,影响结构面力学特性,从而影响边坡稳定性。并按结构面类型取不同软化系数,采用数值模拟方法分析了泄洪雨雾入渗后边坡的变形破坏趋势。分析结果表明:在考虑不同的软化系数时,溢0+555.00下游侧边坡岩体稳定性有较大的差别,若以中间值075考虑,溢洪道陡槽段边坡的稳定性稍差,可能产生一定规模的剪切蠕动变形或块体失稳,必须加强一定的支护措施保证该处边坡在施工期安全和运营期间的长期稳定性。 相似文献
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Slip effects on streamline topologies and their bifurcations for peristaltic flows of a viscous fluid 下载免费PDF全文
We discuss the effects of the surface slip on streamline patterns and their bifurcations for the peristaltic transport of a Newtonian fluid. The flow is in a two-dimensional symmetric channel or an axisymmetric tube. An exact expression for the stream function is obtained in the wave frame under the assumptions of long wavelength and low Reynolds number for both cases. For the discussion of the particle path in the wave frame, a system of nonlinear autonomous differential equations is established and the methods of dynamical systems are used to discuss the local bifurcations and their topological changes. Moreover, all types of bifurcations and their topological changes are discussed graphically. Finally, the global bifurcation diagram is used to summarize the bifurcations. 相似文献
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