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风浪与自由液面耦合作用下的渔船稳性研究
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作者 许家帅 张光发 《科技创新导报》 2018年第4期39-40,共2页
为了更准确地研究渔船稳性,消除恶劣条件下作业安全隐患,使渔民作业更安全,该文根据某渔船基本参数,及突风、波浪和自由液面的不同数值,在突风、波浪和自由液面耦合作用下研究渔船的稳性,从而判断渔船在某海况下可否安全出海作业。
关键词 突风 波浪 自由液面 耦合 稳性研究
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原油转拨船的稳性问题与对策研究
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作者 王伟 王思铭 《船舶工程》 CSCD 北大核心 2019年第2期6-9,68,共5页
为了保证转拨船在输油作业等工况下的稳性与安全,通过设计原油转拨船与原油轮连接、解脱、传输等作业工况,得到各作业工况下的装载参数,然后校核转拨船作业等工况下的稳性。通过介绍转拨船的船型特点和稳性技术要求,重点研究转拨船的稳... 为了保证转拨船在输油作业等工况下的稳性与安全,通过设计原油转拨船与原油轮连接、解脱、传输等作业工况,得到各作业工况下的装载参数,然后校核转拨船作业等工况下的稳性。通过介绍转拨船的船型特点和稳性技术要求,重点研究转拨船的稳性计算难点以及提高转拨船复原力臂曲线和破舱稳性的措施和方法。通过研究转拨船的典型装载工况,利用NAPA软件模拟装载计算实现稳性研究计算,为后续的转拨船总布置设计和稳性研究提供设计参考依据。 展开更多
关键词 转拨船 稳性研究 复原力臂曲线 破舱
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430 TEU江海直达集装箱船总体设计与性能 被引量:1
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作者 王伟 宗涛 +3 位作者 刁峰 陆天奇 赵强 杨佑宗 《船舶工程》 CSCD 北大核心 2021年第11期26-32,51,共8页
针对目前江海直达集装箱船队中400多箱船型空缺的现状,围绕达到内河绿色船舶能效指标EEDI-3的研究目标,重点对该船型的主尺度和总布置、线型优化和能效指标、敞口集装箱船型的舱室布置和稳性,以及结构设计等关键技术进行了深入研究。通... 针对目前江海直达集装箱船队中400多箱船型空缺的现状,围绕达到内河绿色船舶能效指标EEDI-3的研究目标,重点对该船型的主尺度和总布置、线型优化和能效指标、敞口集装箱船型的舱室布置和稳性,以及结构设计等关键技术进行了深入研究。通过总布置优化设计、CFD技术和模型试验验证等综合技术手段,使该船获得了最优主尺度,最低油耗、内河绿色EEDI-3的最高能效指标。 展开更多
关键词 江海直达集装箱 EEDI-3 总布置设计 稳性研究 CFD技术 模型试验
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新型表层套管二合一钻井技术的研究和应用 被引量:1
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作者 陶林 刘小刚 +1 位作者 左存海 朱国宁 《海洋石油》 CAS 2011年第2期91-95,共5页
随着渤海油田勘探钻井向深层发展,钻井风险逐渐增大,费用逐渐增加,如何有效降低作业成本是渤海勘探井作业一个比较棘手的课题。早期渤海井深4000m的勘探井身结构设计至少需要五层套管,但随着钻井技术的发展,渤海勘探井井身结构逐渐优化... 随着渤海油田勘探钻井向深层发展,钻井风险逐渐增大,费用逐渐增加,如何有效降低作业成本是渤海勘探井作业一个比较棘手的课题。早期渤海井深4000m的勘探井身结构设计至少需要五层套管,但随着钻井技术的发展,渤海勘探井井身结构逐渐优化,节约了较多成本。针对渤海集束勘探钻井实施的Φ339.7mm套管作为隔水套管的局限性,从稳定性、相关配套设备技术及操作要点等方面对Φ508mm+Φ339.7mm表层套管二合一钻井技术的优越性进行了介绍。该技术的成功应用,势必将给今后的勘探钻井作业带来更好的经济效益。 展开更多
关键词 新型 表层套管二合一 套管稳性研究 配套技术 应用成果
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Study on the combination ability and stability of rice restore line Yihui1577
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作者 包灵丰 林刚 +2 位作者 赵德明 曾健 李云武 《Agricultural Science & Technology》 CAS 2006年第2期2-8,共7页
Yihui1577 was bred after over 10 generations by crossing R16 and Yunan purple rice. Many new hybrid rice varieties have been bred with Yihui1577, of which Gangyou1577. Ilyou1577, Nyou1577 and Yixiang1577 were certifie... Yihui1577 was bred after over 10 generations by crossing R16 and Yunan purple rice. Many new hybrid rice varieties have been bred with Yihui1577, of which Gangyou1577. Ilyou1577, Nyou1577 and Yixiang1577 were certified by Sichuan Crop Variety Release Committee, Gangyou1577 and Yixiang1577 were certified by National Crop Variety Release Committee. The series varieties bred with Yihui1577 have been used widely with accumulated area of 1,200,000 ha. By using Yihui1577 as breeding material, an excellent restore line Yihui3003 and some other restore lines, such as Yihui1979 and Yihui315 with good quality and combination ability have been bred. Analysis of combination ability and stability of restore line Yihui1577 was made by using agricultural experimentation and statistical approach. The combination ability analysis was made by not complete dual crossing method with 4 CMS lines and 6 restorer lines. It shows that the general combination ability effect value of Yihui1577 is 0.226, while Minghui63 is -0.113. So the general combination ability of Yihui1577 is prior to that of Minghui63. Stability analysis shows that the F value of Gangyou1577 is 1.81378, while Sanyou63 is 1.40327, both doesn't reach significant level. So Gangyou1577 has the same stability as Sanyou63.The same conclusion is got in the stability analysis of the breeds of II you 1577, Yixiang1577, Nyou 1577 and so on. 展开更多
关键词 RICE restore line Yihui1577 combination ability STABILITY
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表层二合一复合套管在渤海油田的应用
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作者 陈爱国 赵少伟 侯泽宁 《船海工程》 北大核心 2016年第A01期182-185,共4页
20”+13—3/8”复合表层套管井身结构优化钻井技术就是在13—3/8"套管作为隔水导管无法满足深井作业的背景下,能够降低钻井成本的一项新技术。介绍20”+13—3/8”复合表层套管井身结构优化钻井技术的稳性研究,以及相关配套设备... 20”+13—3/8”复合表层套管井身结构优化钻井技术就是在13—3/8"套管作为隔水导管无法满足深井作业的背景下,能够降低钻井成本的一项新技术。介绍20”+13—3/8”复合表层套管井身结构优化钻井技术的稳性研究,以及相关配套设备技术和操作要点。此项技术一年来在勘探钻井中的应用,在工程上和经济上取得了丰硕的成果。 展开更多
关键词 复合 表层套管 优化井身结构 套管稳性研究
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NEW THEORY IN TUNNEL STABLILITY CONTROL OF SOFT ROCK──MECHANICS OF SOFT ROCK ENGINEERING 被引量:7
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作者 何满朝 《Journal of Coal Science & Engineering(China)》 1996年第1期39-44,共6页
Tunnel stability control is a world-wide difficult problem. For the sake of solving it,the new theory of soft rock engineering mechanics has been estabilished. Some key points,such as the definition and classification... Tunnel stability control is a world-wide difficult problem. For the sake of solving it,the new theory of soft rock engineering mechanics has been estabilished. Some key points,such as the definition and classification of soft rock, mechanical deformation mechanism of a soft rock tunnel, the critical support technique of soft rock tunnel and the new theory of the soft rock tunnel stability control are proposed in this paper. 展开更多
关键词 tunnel of soft rock mechanical mechanism of deformation complex type transforming technique
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The Stability Research for the Finite Difference Scheme of a Nonlinear Reaction-diffusion Equation 被引量:6
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作者 XU Chen-mei 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2008年第2期222-227,共6页
In the article, the fully discrete finite difference scheme for a type of nonlinear reaction-diffusion equation is established. Then the new function space is introduced and the stability problem for the finite differ... In the article, the fully discrete finite difference scheme for a type of nonlinear reaction-diffusion equation is established. Then the new function space is introduced and the stability problem for the finite difference scheme is discussed by means of variational approximation method in this function space. The approach used is of a simple characteristic in gaining the stability condition of the scheme. 展开更多
关键词 reaction-diffusion equation finite difference scheme stability research variational approximation method
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Wheel-shaped icosanuclear Cu-containing polyoxometalate catalyst: Mechanistic and stability studies on light-driven hydrogen generation 被引量:3
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作者 Yeqin Feng Lin Qin +4 位作者 Junhao Zhang Fangyu Fu# Huijie Li Hua Xiang Hongjin Lv 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第2期442-450,共9页
In this paper,we report the synthesis and characterization of a wheel-shaped icosanuclear Cu-containing polyoxometalate(POM),K_(12)Li_(13)[Cu_(2)0Cl(OH)_(24)(H_(2)O)_(12)(P_(8)W_(48)O_(184))]·22H_(2)O(K_(12)Li_(1... In this paper,we report the synthesis and characterization of a wheel-shaped icosanuclear Cu-containing polyoxometalate(POM),K_(12)Li_(13)[Cu_(2)0Cl(OH)_(24)(H_(2)O)_(12)(P_(8)W_(48)O_(184))]·22H_(2)O(K_(12)Li_(13)-Cu_(2)0P_(8)W_(48)).The resulting cation-exchanged tetrabutylammonium salt of the polyoxoanion Cu_(2)0P_(8)W_(48)(TBA-Cu_(2)0P_(8)W_(48))exhibits high efficiency for visible-light-driven H_(2) production in the presence of an[Ir(ppy)2(dtbbpy)][PF_(6)]photosensitizer and a triethanolamine electron donor.Under optimal conditions,the turnover number for H_(2) production reaches~2892 after 5 h of photocatalysis and thereafter continuously increases to~13400 in a long-term 120 h reaction,representing the best performance among all reported transition-metal-substituted POM catalysts.Mechanistic studies confirm the existence of reductive and oxidative quenching processes,of which the reductive quenching pathway is dominant.Various stability tests demonstrate that the TBA-Cu_(2)0P_(8)W_(48) catalyst slowly dissociates Cu ions under turnover conditions;however,both the starting TBA-Cu_(2)0P_(8)W_(48) and its molecular decomposition products are dominant active species for efficient and long-term H_(2) production. 展开更多
关键词 POLYOXOMETALATES Icosanuclear copper substitution Light-driven hydrogen production Photocatalytic mechanism Stability study
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ALTERNATING METHOD STUDY ON STRESS ANALYSIS OF SURROUNDING ROCK FOR TWO RANDOM GEOMETRY TUNNELS 被引量:2
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作者 吕爱钟 张路青 《Journal of Coal Science & Engineering(China)》 1997年第2期24-29,共6页
The stress analysis of surrounding rock for two random geometry tunnels is studied in this paper by using Schwarz’s alternating method. The simple and effective alternating algorithm is found, in which the surplus su... The stress analysis of surrounding rock for two random geometry tunnels is studied in this paper by using Schwarz’s alternating method. The simple and effective alternating algorithm is found, in which the surplus surface force is approximated by Fourier series, thus the iteration derivation can be conducted according to the precision required, finally, the stress results with high precision are obtained. 展开更多
关键词 Schwarz's alternating method Fourier series the surplus surface force iteration the doubly connected region
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Numerical research on stability control of roofs of water-rich roadway 被引量:3
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作者 Meng Chao Li Xuehua +1 位作者 Yao Qiangling Zhou Jian 《International Journal of Mining Science and Technology》 SCIE EI 2014年第3期409-416,共8页
In order to study the strength-weakening law of roofs of water-rich roadway, this study used FLAC software, and simulated and analyzed the failure characteristics of the surrounding rock of water-rich roadway under th... In order to study the strength-weakening law of roofs of water-rich roadway, this study used FLAC software, and simulated and analyzed the failure characteristics of the surrounding rock of water-rich roadway under the condition of different cross sections and support parameters, finally obtained the stress distribution of the principle stress of the roadway as well as the displacement variation of its surrounding rock. Results indicate that the roof stability of roadway with semicircular cross section is better than the roadway with inclined rectangular cross section under water-rich condition. Besides, the surrounding rock deformation of roadway under the action of water shows a pronounced increase compared to the roadway without the action of water due to the fact that water will obviously weaken the surrounding rock of roadway, especially its roof. It is very beneficial to control roof stability of water-rich roadway and guarantee the roadway stability during its service life by improving the pretension of bolt and cable as well as decreasing inter-row spacing of the bolt. 展开更多
关键词 Water-rich roadway Roof control Numerical simulation Bolt support
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RESEARCH ON DENSITY STABILITY OF AIRDENSE MEDIUM FLUIDIZED BED 被引量:1
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作者 骆振福 陈清如 《Journal of China University of Mining and Technology》 1994年第1期62-70,共9页
In this paper on the basis of studying the distribution of fine Coal in the dense medAn fluidised bed. the optimai size range of fine coal, which constitutes a fluidized bed together with the dense medium, has been fo... In this paper on the basis of studying the distribution of fine Coal in the dense medAn fluidised bed. the optimai size range of fine coal, which constitutes a fluidized bed together with the dense medium, has been found. In the separating process the fine coal will continuously aeeumulate in fluidized bed, thus inevitably reducing the density of the bed.In order to keep bed density stable, the authors adopted such measures as split-now of used medium and complement of fresb dense medium.The experiment results in both lab and pilot systems of the air-dense medium fluidized bed show that these measures are effective and satisfactory. Then authors also have estabinbed some relative dynamic mathematical models for it. 展开更多
关键词 air dense medium fluidized bed fine coal DENSITY
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STUDY ON LAWS OF UNDERGROUND PRESSURE APPEARANCEIN THE DEEP ENTRIES OF COAL MINES
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作者 LIxiaofu LIHuamin 《Journal of Coal Science & Engineering(China)》 1995年第1期67-72,共6页
Based on a large amount of field investigation and observations, the paper analyzes and summarizes the mining depths and depth distribution of coal mines in China, discusses the characteristics of undrground pressure ... Based on a large amount of field investigation and observations, the paper analyzes and summarizes the mining depths and depth distribution of coal mines in China, discusses the characteristics of undrground pressure appearance in the entries of deep mining, points out some characteristics of surtounding rocks when rHo> =0.5, such as obvious rheologital deformation,and puts forward the main principles of supporting the entries in deep mining 展开更多
关键词 deep mining rock pressure at entries appearance law
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STUDY ON HARD ROOF ROCKBURST IN COAL MINE
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作者 潘一山 陈德军 章梦涛 《Journal of Coal Science & Engineering(China)》 1997年第2期6-14,共9页
Based on practical observation in Mentougou Mine, a general law of roof rockburst is put forward. The destabilization theory of roof rockburst has been established. The general laws of microquake premonition and earth... Based on practical observation in Mentougou Mine, a general law of roof rockburst is put forward. The destabilization theory of roof rockburst has been established. The general laws of microquake premonition and earth sound in roof rockburst is advanced. The relationship between roof rockburst and rockburst of coal body is studied. 展开更多
关键词 hard roof ROCKBURST destabilization theory
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STRUCTURE AND STABILITY OF MAIN ROOF AFTER ITS FRACTURE
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作者 朱德仁 钱鸣高 《Journal of China University of Mining and Technology》 1990年第1期21-30,共10页
A series of physical modelings in which a main roof is considered as a Kirchhoff plate supported or clammed by Winkler elastic foundation were performed to simulate the fracturing process of the main roof in longwall ... A series of physical modelings in which a main roof is considered as a Kirchhoff plate supported or clammed by Winkler elastic foundation were performed to simulate the fracturing process of the main roof in longwall mining. Based on these modelings spatial structures of the main roof after its fracture are described, blocks of the fractured main roof are classified and their behaviors are analyzed in this paper. Additionally, two stability indexes of the structures are defined, and the factors affecting stability of the structures with different boundaries and geometric conditions are discussed. 展开更多
关键词 coal mining main roof FRACTURE STABILITY MODELING
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A NEW METHOD FOR STABILITY ANALYSIS OF UNDERGROUND OPENING USING ARTIFICIAL NEURAL NETWORK
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作者 杨英杰 张清 《Journal of Coal Science & Engineering(China)》 1996年第2期16-22,共7页
The stability of underground opening is strongly constrained by a variety of factors. These include initial stress, structure of rock mass, and underground water, etc. A new approach proposed in this paper aims at rev... The stability of underground opening is strongly constrained by a variety of factors. These include initial stress, structure of rock mass, and underground water, etc. A new approach proposed in this paper aims at revealing the degree of significance of them in order to catch the key factors. This new approach utilizes the mapping potentiality of artificial neural network and works out the sophisticated interactions among those factors from sample set. As a demonstration, an example is given for the application of this method to an underground opening. All results of this paper prove the efficiency of artificial neural network in stability analysis of underground opening. 展开更多
关键词 stability of underground opening artificial neural networks Relative Strength of Effect (RSE)
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SELECTION OF HORIZONTAL DISTANCE X BETWEEN ROADWAY AND THE EDGE OF ITS UPPER PILLAR
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作者 陆士良 孙永联 姜耀东 《Journal of China University of Mining and Technology》 1994年第1期43-51,共9页
The horizontal distance X between roadway and the edge of its upper pillar is considered as an important parameter for layout of roadway in floor strata or in the adjacent coal seam. Based on the research achievements... The horizontal distance X between roadway and the edge of its upper pillar is considered as an important parameter for layout of roadway in floor strata or in the adjacent coal seam. Based on the research achievements of rockstrata pressure, this paper illustrates the quantitative relationship among the mining situation of upper searn, the rockstrata properties around roadway, the vertital distanee Z (between roadway and its upper pillar), and the horizontai distance X (between roadway and the edge of its upper pillar), and provides a main basiS for the selection of value X and the relative location between roadway and its upper seam. 展开更多
关键词 roadway layout deformation of surrounding rock upper pillar borizontal distance
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ELASTO-PLASTIC BACK ANALYSIS OF FROZEN SOIL WALL
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作者 张铭 翁家杰 《Journal of China University of Mining and Technology》 1994年第1期52-61,共10页
The paper briefly describes the range and methods of the research on the stability of frozen wall. Using the Back Analysis Method combining with the model test of frozen wall, the comprebensive study on the stability ... The paper briefly describes the range and methods of the research on the stability of frozen wall. Using the Back Analysis Method combining with the model test of frozen wall, the comprebensive study on the stability of frozen wail is firstly carried out by the authors. Finally, a new viewpoint of adopting limited strain as the major eriteria of stability in frozen soil engineering is proposed. 展开更多
关键词 frozen wall STABILITY Back Analysis
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PROGRESS OF ACOUSTIC WAVE TECHNIQUE ANDITS APPLICATION IN UNDERGROUND PRESSURE MEASUREMENT
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作者 周楚良 李新元 张晓龙 《Journal of China University of Mining and Technology》 1994年第1期80-91,共12页
This paper carries out tbe experirnent study on the correlation between am stress-strain process of rock samples and the acoustie parameter change of rock by using the measurement system of KS acoustic wave data proce... This paper carries out tbe experirnent study on the correlation between am stress-strain process of rock samples and the acoustie parameter change of rock by using the measurement system of KS acoustic wave data processing device. On the spot, the stability of surrounding rock is studied by means of experiments on the relationship between the change process (from elastie to plastic failure zone) in surrounding rock of roadway and the change law of acoustic parameters of rock. These acoustie parameters inelude wave amplitude, spectral amplitude, spectrum area, spectral density,wave veloeity and attenuation coefficient etc. 展开更多
关键词 acoustic wave technique underground pressure measurement rockmass stability
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DARPA Robotics Grand Challenge Participation and Ski-Type Gait for Rough-Terrain Walking 被引量:2
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作者 Hongfei Wang Shimeng Li Yuan F.Zheng 《Engineering》 SCIE EI 2015年第1期36-45,共10页
In this paper, we briefly introduce the history of the Defense Advanced Research Projects Agency(DARPA) Grand Challenge programs with particular focus on the 2012 Robotics Challenge. As members of team DRC-HUBO, we pr... In this paper, we briefly introduce the history of the Defense Advanced Research Projects Agency(DARPA) Grand Challenge programs with particular focus on the 2012 Robotics Challenge. As members of team DRC-HUBO, we propose different approaches for the Rough-Terrain task, such as enlarged foot pedals and a transformation into quadruped walking. We also introduce a new gait for humanoid robot locomotion to improve stability performance, called the Ski-Type gait. We analyze the stability performance of this gait and use the stability margin to choose between two candidate step sequences, Crawl-1 and Crawl-2. Next, we perform a force/torque analysis for the redundant closedchain system in the Ski-Type gait, and determine the joint torques by minimizing the total energy consumption. Based on the stability and force/torque analysis, we design a cane length to support a feasible and stable Crawl-2 gait on the HUBO2 humanoid robot platform. Finally, we compare our experimental results with biped walking to validate the SkiType gait. We also present our team performance in the trials of the Robotics Challenge. 展开更多
关键词 humanoid robot DARPA robotics challenge(DRC) rough-terrain walking Ski-Type gait
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