基于ANSYS的SUC鼓型橡胶护舷防冲板的有限元分析     

郑鹏翔  邱筱童  尹训强  王桂萱 《防灾减灾学报》2022,38(1):9-13,59

鼓型橡胶护舷防冲板是港口防冲体系中的重要装置,如何有效合理分析复杂船舶荷载冲击下的受力特点是进行其结构设计的关键技术问题.以大连某实际工程为例,基于通用有限元软件ANSYS建立了 SUC鼓型橡胶护舷防冲板的三维计算模型,开展了四种典型靠泊方式的仿真研究.针对防冲板中的关键部位进行了应力和变形研究,并对护舷选型及船舶停泊...  相似文献   

VLBI相位校正信号提取的软件实现方法     

杨艳  郑为民 《中国科学院上海天文台年刊》2006,(1):107-117

从VLBI相关处理结果中提取的延迟值包括了天线、终端等设备的时延,必须对其加以修正,最终结果才能达到精度要求。提取相位校正信号,可以消除这些设备引入的时延,从而校正同一波前信号到达基线两端的几何时延。该文介绍了提取相位校正信号的原理、算法及软件实现方法。软件采用多线程和SSE技术,具备4台站多通道全部相位校正信号提取能力。  相似文献   

Structural Control of Sand Bodies and Deep Exploration for Oil and Gas     

Cheng Rihui  Lin Changsong  ZHENG Herong 《世界地质(英文版)》2002,5(2)

The structural styles can be used to analyses and predict developments and distributions of sand bodies in a rift basin. The dynamic process of faulting and sedimentation can be expressed as follow: the basin topography controlled by fault activity can control water dynamics; which in turn affect the transport and sedimentation of sediments. The corresponding analysis between structural styles and sand depositional types includes the following aspects: (1) in section, the corresponding between development of fault terraces and sand depositional types; (2) in plane, the relationship between faults' association and distributions of sand bodies. There are four types of terrace styles to be identified. They are Steep Slope Single Fault Terrace (SSSFT), Steep Slope Multiple Fault Terrace (SSMFT), Gentle Slope (GS) and Gentle Slope Multiple Fault Terrace (GSMFT), which also can be divided into six subtypes by the timing of the faults activities and the directions of their activity migrations (basinward and landward or marginward). They correspond to the following sand depositions such as alluvial fan, fan delta and turbidite fan etc.. The analysis of structure-sedimentation is a discussion on the rank Ⅲ sequence evolution under the condition of pulsing or episodic fault activities. It has been recognized four plane fault associations such as the comb, the broom, the fork and the fault-fold association as well as the corresponding sand distributions. Structural-sedimentary models above mentioned are significant for the deep oil and gas exploration when lacking of the drill data. It may reduce multiple resolutions in the interpretation of seismic-sedimentary facies and promote sand predictions through the constraints of the structural styles of the basin units. The structural-sedimentary pattern can be used as a geological model in oil and gas exploration in the rift basins.  相似文献   

计算机制图综合的研究进展   总被引：6，自引：0，他引：6  

刘南  郑家文  王利军 《地球信息科学学报》1997,(3):60-66

本文简明而较全面地评述利用计算机进行制图综合研究之发展的过去和现状,并展望该领域的未来发展趋势。  相似文献   

Study on drilling mechanism and optimization of percussion-extruding DTH hammer bit     

LUO Chunhong  ZHENG Zhichuan  CAO Pinlu College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2009,12(1):36-39

The authors tested the percussion-extruding Down-the-hole （DTH）hammer bit with five different structures and mainly analyzed the drilling mechanism between conical bit and stepped bit. In addition, aiming at ＂the pile effect＂ in combination with the advantage＇ of stepped bit, we design a new cam spinning bit and test it outdoors. The result shows that using cam spinning bit can solve the problem of ＂the pile effect＂, which can also obtain higher drilling efficiency than using conical bit in high confining pressure strata. It is characterized by novel structure and high drilling speed as well as good guiding, and it is significant for improving efficiency in percussion-extruding drilling technique.  相似文献   

南海北部神狐海域天然气水合物形成及分布的地质因素   总被引：6，自引：0，他引：6  

雷新民  张光学  郑艳 《海洋地质前沿》2009,25(5)

从天然气水合物发育的地质构造条件、沉积条件、气源条件、温压条件等分析了神狐海域影响水合物形成及分布的地质因素.指出神狐海域处在洋陆壳的过渡带上,断裂-褶皱构造及流体底辟构造发育,对水合物的形成具有重要的控制作用.受等深流和海底滑塌双重作用,研究区沉积异常体发育,沉积厚度大、沉积速率高,有利于水合物发育.通过对神狐海域附近钻探结果及区内地质调查站位资料的分析表明:目标区具有含巨量的生物气和热成因气资源潜力,具备形成天然气水合物的气源条件,气源为文昌-恩平组烃源岩.此外,受热流值北高南低的分布格局的影响,神狐海域BSR埋深也表现为北部浅南部深,且BSR分布区整体处在天然气水合物稳定存在的温压范围内,满足水合物形成及保存所需的温压条件.神狐海域的地质构造条件、沉积特征、气源条件、温压条件等都非常有利于天然气水合物发育.  相似文献   

涌浪对风浪能量影响的实验研究     

黄必桂  郑桂珍  丛培秀 《中国海洋大学学报(自然科学版)》2009,39(3)

在实验室风浪水槽中进行纯风浪和混合浪波面位移观测,研究波长较长的规则波对风浪能量的影响.本文用混合浪和纯风浪中的风浪显著波的零阶谱矩之比代表混合浪中的风浪与纯风浪能量之比,并以此表征涌浪对风浪能量的影响.研究了该能量比随涌浪波陡S、风区x、波龄倒数u/C、涌浪频率与纯风浪谱峰频率之比fs/fwp的变化规律.结果表明,涌浪对风浪能量的抑制作用随涌浪波陡的增加、波龄倒数的增大及涌浪频率与纯风浪谱峰频率之比的增大而增强.发现该能量比依赖于无因次量R=(1+80(πS)2)1.9(fs/fwp)0.9(u/C)0.27,并拟合得到2者的经验关系.此外,本文实验还发现,在某些情况下,涌浪的存在使风浪能量增加.  相似文献   

EM算法的BFGS和DFP联合加速算法     

王胜帅  单锐  陈静  郑鹏辉 《成都信息工程学院学报》2008,23(3):337-339

使用非线性规划中的变度量法BFGS算法和DFP算法给出了一种新的加速EM算法收敛的方法。  相似文献   

Research on formation density MWD instrument in engineering geological exploration     

Dajun ZHAO  Guosheng JIANG  Youhong SUN  Junhua ZHENG  Zhuwen WANG 《世界地质(英文版)》2008,11(4)

A high efficiency method is very important in geological survey for a new city in China. Geophysical parameters are Measured While Drilling(MWD), and these parameters are processed and explained on the ground, so the method can replace conventional engineering geological exploration for drilling rock sample. According petroleum engineering MWD, using the different characters of different rock absorbs γ radial, with the method of storing data in hole and explaining data on the ground, engineering geological exploration formation density MWD is researched. The MWD works stabilized, and the performance is good with precise data.  相似文献   

硒对华贵栉孔扇贝碱性磷酸酶的酶动力学及理化性质研究          下载免费PDF全文

余群  王重刚  陈荣  郁昂  郑微云 《海洋科学》2008,32(10):56-61

探讨了微量硒(Se~(4+))对华贵栉孔扇贝(Chlamys nobilis(Reeve))碱性磷酸酶(AKP)的作用。以催化动力学原理研究了不同缓冲系统中微量硒时AKP的影响。结果表明,Se~(4+)对谈酶的作用与酶所处的环境有关。在0.05 mol/L Na_2CO_3-NaHCO_3(pH 9.0)缓冲溶液中Se~(4+)浓度小于12.5 mmol/L时呈现出激活作用;Se~(4+)浓度大于12.5 mmol/L时呈现出非竞争性的抑制作用,其抑制常数为6.81×10~(-2)mol/L。在0.05 mol/L Tris-HCl缓冲系统(pH 9.0)中,微量Se~(4+)对AKP具有强烈竞争性抑制作用,其抑制常数为3.79×10~(-1)mol/L。经紫外吸收光谱、荧光发射光谱和圆二色谱的实验表明,微量Se~(4+)与AKP作用后,该酶的构象已发生了变化。研究发现海水环境中若含有微量Se~(4+)(SeO_3~(2-)),可以促进扇贝AKP的水解。利于贝类的生长发育和外壳的形成,并有益于贝类的繁殖。  相似文献