共查询到20条相似文献，搜索用时 93 毫秒
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本文针对HCW-90型全液压自动猫道的钻杆支架起升过程进行研究,采用多体动力学与液压控制系统联合仿真方法,分析了钻杆支架起升液压缸动作的同步性对钻杆从支架末端运动至平台档销限位处的动态过程的影响。重点讨论了起升液压缸同步性对管体空间位姿、动力学参数、管体运动至终了处与档销碰撞过程。进一步分析了管体受到限位后趋于稳定的动态过程和定位精度。此外,综合考虑管体运移的快速性、平稳性和定位准确性,对起升液压缸的液压控制系统的输入信号进行了合理调整,并在满足工作性能的前提下,提出了采用分流阀构建低成本液压控制系统的方案。 相似文献
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大陆科学钻探是获取地下实物信息的唯一手段, 具有钻进地层条件复杂、取芯要求特殊、对钻探工具及装备要求高等特点。美国和德国的先进钻探装备代表了国际深部钻探装备的发展方向; 近十年来, 国内深井和超深井钻机研制取得了较快发展; 本文着重分析了美国NOV理想钻机、德国海瑞克TI-350全液压钻机、中国“地壳一号”万米钻机。国际大陆科学钻探装备关键技术包括顶部驱动钻井技术、钻探装备自动化技术、钻探装备信息化技术。顶部驱动钻井技术利用顶驱装置取代孔口转盘驱动钻杆回转, 钻井作业的能力和效率得到显著提高; 钻探装备自动化技术以实现安全、可靠、高效地运移及拧卸钻具为目的, 主要包括自动猫道、自动摆排管装置和自动上卸扣装置; 钻探装备信息化技术是伴随着现代机电液一体化控制技术和随钻测量技术发展起来的, 通过对地面与井下数据的联合分析, 实现数据综合解释和自主钻进。未来深部大陆科学钻探装备的研制应秉承安全、可靠、高效、节能、舒适的设计理念, 以实现自动化、智能化、信息化钻井为发展目标。 相似文献
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在大直径救援井施工起下钻作业中,钻杆运移装置用于大直径钻具输送及钻柱接续。针对钻杆运移装置定位过程中钻杆易产生振动,难以快速、准确地将钻杆举升至动力头翘起角度进行对扣的问题。首先分析了钻杆运移装置的结构特点和工作原理,利用结构关系推导了钻杆举升时的运动学模型,得出钻杆末端接头与举升油缸和运移小车运动规律的映射关系,并采用有限元方法建立了钻杆举升时的动载受力模型,得出了钻杆末端接头的振动加速度主要由举升油缸和运移小车的工作速度所决定,且各部件的工作速度主要由各自的输入流量所确定;其次引入了基于模糊粒子群优化算法的综合误差评价函数,将钻杆末端接头的转角误差和位姿误差作为输入信号,采用加权法进行计算出综合误差和加速度误差,利用梯形隶属度函数构造了模糊控制规则,得出综合误差、加速度误差与比例参数、积分参数、微分参数之间关系,完成PID的控制参数调节,实现了对钻杆末端接头的主动抑振控制;最后利用MATLAB软件搭建了数值仿真模型,以某次钻杆运移装置工作时测量数据信号为例进行仿真研究,系统综合误差只需0.9 s可将振幅衰减至峰值的10%以下,同时加速度误差仅为0.05 mm/s2 相似文献
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本文主要针对一种新型的可以保留钻杆旋转自由度的机械手,研究其运移钻杆时的稳定性和安全性是否满足要求。该机械手通过蓄能器提高了停泵保压效果,通过滚轮结构保留了钻杆的旋转自由度。本文建立了机械手的多体动力学模型及配套的液压控制回路,并进行机-液联合仿真分析。在分别改变钻杆直径和液压回路压力的条件下,观察机械手夹紧效果。通过仿真得到了钻杆的夹紧力变化曲线及钻杆重心位置变化曲线,确定了液压系统的许用压力范围,并验证了单机械手夹持状态下钻杆运移平稳性满足要求。 相似文献
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2009年3月2～4日,在河北省保定市召开的“水井钻探新技术交流及现场观摩会”上展出的SDC-1000型全液压钻机引起国内水井和工程界与会专家们的极大关注。
该钻机在现场进行了起塔、落塔、动力头回转、快速提升、快速下降、拧卸钻杆等动作演示。通过现场工作人员的热情讲解,与会专家对钻机的良好性能表示肯定。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献