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水流作用下单体网格式锚碇网箱水动力特性研究   总被引:1,自引:1,他引:0  
运用刚体运动学原理及集中质量方法,建立了计算浮架、网衣、锚绳及浮子受力和运动的数学模型。利用此数学模型获得了水流作用下重力式网箱在网格式锚碇情况下的锚碇锚绳受力、浮架运动计算结果,并与试验结果进行了比较,二者符合程度较好。在此基础上,计算了在不同设计流速与流向作用情况下,锚绳受力、浮架运动及网衣变形。计算结果表明,在相同工况下,3类锚绳中,锚碇锚绳受力最大,连接锚绳受力次之,网格锚绳受力最小。两种流向相比,相同条件下斜向流作用时,锚碇锚绳、连接锚绳受力大于正向流作用,网格锚绳受力情况相反;浮架中心水平位移表现为斜向流作用大于正向流作用,两种流向作用下浮架中心的竖直位移、浮架倾角及网衣变形相近。  相似文献
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运用刚体运动学原理与集中质量方法,建立双体组合式网箱浮架、网衣、锚绳及浮子的受力运动方程数学模型,利用物理模型试验对数学模型进行了验证,结果表明,本数学模型具有较好的可靠性和准确性。运用数字模型,计算了在不同流速条件下,双体组合式网箱锚绳受力、浮架运动及网衣变形。  相似文献
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Permian marine strata have gradually become a research focus in the world. The marine strata of the Late Permian Dalong Formation (P3d) in the Fenghai area, Fujian Province, have become more and more important as their geochemical characteristics record important geological information and are a good indicator for recovering and reconstructing the paleosedimentary environments and tectonic attributes. The major elements, trace elements and rare earth elements were analyzed by XRF and ICP-MS, respectively. Based on the results of detailed field geological surveys, profile measurements as well as typical sample collection, the tectonic setting and provenance of Permian marine mudstone were comprehensively discussed. The results showed that the Dalong Formation (P3d) was deposited in an active continental margin tectonic environment as revealed by the relation between Fe2O3 + MgO and TiO2 and Al2O3/SiO2. The fingerprint characteristics of Mn, Fe, Co, Ni and REE and the ratio of U/Th, V/Cr, Sr/Ba, (La/Yb)N and V/(V + Ni) indicated that the sedimentary provenance was mainly derived from potassium feldspar, followed by muscovite. Sedimentary water bodies showed a gradually decreasing depositional rate trend, water depth gradually shallowing and paleo-salinity and productivity gradually increasing. Moreover, since transient delamination occurred during sedimentary processes, sedimentary water bodies showed obvious neritic characteristics. It was consistent with the results revealed by lithological and geochemical characteristics. Calcareous mudstone and siltstone transitioned into fine sandstone from bottom to top, indicating paleo-water bodies became shallow. The research results provided good reference and guidance for understanding Permian paleo-sedimentary environments and tectonic attributes of the Yong’an area, Fujian Province, southeastern China.  相似文献
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