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外能源自动炮动态仿真 被引量:4
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作者 戴劲松 王文中 《南京理工大学学报》 EI CAS CSCD 北大核心 2001年第3期234-237,共4页
系统动力学键合空间理论是系统动力学键合图理论的最新发展 ,是处理多能量范畴耦合复杂系统动态仿真的一种理论和方法。外能源自动炮是一个包含机电等多种能量耦合的复杂系统 ,应用传统的自动炮动力学分析理论 ,难以准确描述这样的复杂... 系统动力学键合空间理论是系统动力学键合图理论的最新发展 ,是处理多能量范畴耦合复杂系统动态仿真的一种理论和方法。外能源自动炮是一个包含机电等多种能量耦合的复杂系统 ,应用传统的自动炮动力学分析理论 ,难以准确描述这样的复杂系统。引入键合空间理论 ,为外能源自动炮系统动态仿真提供了行之有效的理论和方法。该文以某型外能源自动炮为例 ,给出了应用键合空间理论进行外能源自动炮动态仿真的方法和步骤。 展开更多
关键词 力学 仿真 动炮 键合图 合空间
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海上浅层折射波地震探测动炮点方法及数据处理的研究
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作者 杨和乃 《山东海洋学院学报》 1985年第3期76-84,共9页
我国海域辽阔,海底蕴藏着丰富的自然宝藏,沿岸有良好的天然港湾。为了开发海底浅层矿产资源和发展海洋工程事业,对海底浅层地质构造的研究就成为一项重要任务。目前在港湾中进行基底地质调查的方法主要有三种:(1)钻探方法:它可以... 我国海域辽阔,海底蕴藏着丰富的自然宝藏,沿岸有良好的天然港湾。为了开发海底浅层矿产资源和发展海洋工程事业,对海底浅层地质构造的研究就成为一项重要任务。目前在港湾中进行基底地质调查的方法主要有三种:(1)钻探方法:它可以提供最直接、最可靠的地质资料和有关工程技术参数,是海洋工程勘探中不可缺少的方法。 展开更多
关键词 海上浅层折射波 地震探测 动炮点法 数据处理
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综放工作面初采放松动炮提高回收率的实践 被引量:1
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作者 李宗涛 魏明星 《煤》 2011年第8期44-45,共2页
综放工作面初采期间顶煤不易跨落,一直被认为是综放开采的工艺损失。根据初采期间顶煤、顶板跨落机理,通过放松动炮对工作面顶煤强度进行弱化处理,大大缩短了顶煤初次跨落步距,减少了综放工作面初采损失,从而整体上提高了工作面回收率。
关键词 综放工作面初采 放松动炮 回收率
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先进武装直升机可动炮火控系统设计及仿真分析
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作者 孙隆和 蔡若虹 《电光与控制》 1991年第2期1-9,16,共10页
先进武装直升机是未来战争的重要武器系统,它要求火控系统精度高,攻击范围大。本文提出了一套适合于武装直升机火控系统的设计方案,其特点是:采用两自由度可动炮,大大地增大了火控系统攻击范围;采用飞行器状态估值器、目标状态估值器、... 先进武装直升机是未来战争的重要武器系统,它要求火控系统精度高,攻击范围大。本文提出了一套适合于武装直升机火控系统的设计方案,其特点是:采用两自由度可动炮,大大地增大了火控系统攻击范围;采用飞行器状态估值器、目标状态估值器、闭环火控算法,大大地提高了射击精度。最后对整个火控系统进行了仿真,仿真结果表明该火控系统攻击范围大、射击精度高、反应快,且具有较强的抗干扰能力,能在现有机载计算机上实时工作。 展开更多
关键词 直升机 火控系统 仿真 动炮 设计
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炮点域动校正后F-K滤波 被引量:8
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作者 吴战培 《石油地球物理勘探》 EI CSCD 北大核心 1995年第3期422-423,共2页
关键词 点域校正 滤波 信噪分离 地震勘探
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综采工作面过断层的应用实践 被引量:3
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作者 张成阳 《山西焦煤科技》 2017年第12期37-39,共3页
以磁窑沟煤矿10201综采工作面过断层为工程背景,为防止工作面出现初采期间运输机上窜下移、局部顶板破碎和漏顶等问题,采取了工作面调斜、顺槽揭露断层处顶板补强支护、工作面矸石区域放松动炮、优化生产组织等措施最终顺利通过了该断层。
关键词 过断层 漏顶 调斜 放松动炮 补强支护
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Characteristics of seal shell body's rubber ring with bionic dimpled surfaces of aerodynamic extinguishing cannon 被引量:7
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作者 谷云庆 赵刚 +5 位作者 刘浩 郑金兴 汝晶 刘明明 A.R.Chatto 王成刚 《Journal of Central South University》 SCIE EI CAS 2013年第11期3065-3076,共12页
To solve the problem of sealing between the barrel and the rubber ring of shell body during an launching process of aerodynamic extinguishing cannon, a rubber sealing model with bionic dimpled characteristics was esta... To solve the problem of sealing between the barrel and the rubber ring of shell body during an launching process of aerodynamic extinguishing cannon, a rubber sealing model with bionic dimpled characteristics was established based on the theory of bionic dimpled drag reduction and the principle of rubber sealing. In condition that the bionic dimpled characteristic diameters were 1, 2, 3, 4, and 5 mm, respectively, by numerical simulation, the influence of the installing compression of the rubber sealing ring on its surface stress and deformation was analyzed, and sealing performance of the rubber ring with different diameters of bionic dimpled was studied. The results show that the deformation of rubber ring appears prominent nonlinear characteristics when compression is increased from 1.5 mm to 2.5 ram. When the compression is 2.5 mm, the equivalent compression stress on the sealing areas of both sides of the rubber seal is greater than the working pressure of aerodynamic extinguishing cannon, which could meet the sealing requirement and would not cause leakage. So the rubber sealing ring with bionic dimpled surface possesses a good sealing characteristic and has no negative effect on the sealing of shell body; When the compression is 2.5 mm, the larger equivalent stress on the edge of sealing ring and the more even stress distribution in the high pressure area are generated due to the smaller compressive stress on the bionic dimple areas, which lays a foundation for the drag reduction characteristics of the shell body's rubber ring with bionic dimpled surface. 展开更多
关键词 aerodynamic extinguishing cannon dimpled surface rubber seal compression numerical simulation
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Movement laws and mechanical characteristics of top coal in blasting face
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作者 SUN Guang-zhong JIANG Zhi-gang 《Journal of Coal Science & Engineering(China)》 2010年第4期352-355,共4页
Measuring the top coal movement and abutment pressure about Teaching ThirdMine that belonged to the National Energy Investment and Development.It shows that thetop coal's strong compression occurs 6 m in front of ... Measuring the top coal movement and abutment pressure about Teaching ThirdMine that belonged to the National Energy Investment and Development.It shows that thetop coal's strong compression occurs 6 m in front of the face, the top coal is in front of sideabutment pressure concentration increase area at this time, and the top coal horizontaldisplacement increase rapidly.Also analyzed the top coal mechanical properties, and thetop coal under abutment pressure turned into block state.Finally, analyzed the top coalfailure mechanism and the structure of the mechanical model, and also made a theoreticalanalysis of the top coal's ultimate bearing capacity. 展开更多
关键词 top coal caving abutment pressure mechanical model ultimate bearing capacity
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Lateral wave-field stacking of seismic Fresnel zones for the generalized-offset case 被引量:1
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作者 田楠 范廷恩 +1 位作者 王宗俊 蔡文涛 《Applied Geophysics》 SCIE CSCD 2015年第2期235-243,275,276,共11页
To unify different seismic geometries, the concept of generalized offset is defined and the expressions for Fresnel zones of different order on a plane are presented. Based on wave theory, the equation of the lateral ... To unify different seismic geometries, the concept of generalized offset is defined and the expressions for Fresnel zones of different order on a plane are presented. Based on wave theory, the equation of the lateral wave-field stacking for generalized-offset Fresnel zones is derived. For zero and nonzero offsets, the lateral stacking amplitude of diffraction bins of different sizes is analyzed by referring to the shape of the Fresnel zones of different order. The results suggest the following. First, the contribution of diffraction bins to wave- field stacking is related to the offset, surface relief, interface dip, the depth of the shot point to the reflection interface, the observational geometry, and the size of the interference stacking region. Second, the first-order Fresnel zone is the main constructive interference, and its contribution to the reflection amplitude is slightly smaller than half the contribution of all Fresnel zones. Finally, when the size of the diffraction bin is smaller than the first- order Fresnel zone, the larger the size of the diffraction bin, the larger is the amplitude of the receiver, even in the nonzero offset-case. 展开更多
关键词 OFFSET Fresnel zone wave theory STACKING AMPLITUDE
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Photoelectric Inspecting of Artillery Bore
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作者 ZHANG Jie MA Hong BAI Su-ping YAN Yu-feng 《Semiconductor Photonics and Technology》 CAS 2008年第1期48-50,55,共4页
A photoelectric equipment for inspecting artillery bore is composed of digital display grating sensor and data processing with computer.It can replace the traditional mechanical measurer and realize the automatic insp... A photoelectric equipment for inspecting artillery bore is composed of digital display grating sensor and data processing with computer.It can replace the traditional mechanical measurer and realize the automatic inspection of artillery bore.Introduced are briefly the working principles and analysis of this device. 展开更多
关键词 artillery bore grating sensor automatic inspection precision analysis
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Pathological study of rabbits' femoral arteries subjected to gunshot wounds combining with seawater immersion 被引量:2
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作者 刘鹏 刘晋才 +4 位作者 赖西南 彭学良 吴国萍 张良潮 王丽丽 《Chinese Journal of Traumatology》 CAS 2005年第3期186-190,共5页
Objective: To investigate pathological characteristics of gunshot wounds concomitant seawater immersion in rabbits’ femoral arteries. Methods: Thirty rabbits were divided randomly into 3 groups: simple gunshot-wound ... Objective: To investigate pathological characteristics of gunshot wounds concomitant seawater immersion in rabbits’ femoral arteries. Methods: Thirty rabbits were divided randomly into 3 groups: simple gunshot-wound group (Group I, n=10), gunshot wound with seawater immersion for 30 mins (Group II, n=10), and 60 mins group (Group III, n=10). Femoral arteries were impacted by (0.38 g) steel spheres fired with a (7.62 mm) rifle. After being wounded, rabbits in Groups II and III were immersed in seawater for 30 or 60 mins, but those in Group I were not. At 2, 4, 6, 8, 12 hours following injury, a 40 mm segment of the artery on each side of the gunshot point were excised and observed by light and electron microscopy. Results: The patterns of arterial injuries were mainly contusion and transection. Completely transected artery was classified as primary-wound-tract area, contused area and shocked area. Compared with those in Group I, the primary-wound-tract and contused areas in Group II manifested obvious swelling in the arterial wall especially at the outside 2/3 of the media. Vacuolar structures were often seen in smooth muscle cells of the media. Intercellular space among the smooth muscle cells were filled with homogeneous acidophilic substances. Deep rugae among endothelial cells flattened or rugal folds lost their longitudinal orientation, and marked fibrin and platelet deposition were noticed. No significant difference was detected between Group II and III. The pathological changes in the shocked area were similar in 3 groups. Conclusions: For gunshot wounds concomitant seawater immersion in rabbits’ femoral arteries, there was a marked swelling of cells and intercellular space in primary-wound-tract area and contusion area. The influence of these pathological changes on surgical reparation deservers further study. 展开更多
关键词 Wound gunshot Blood vessels PATHOLOGY Seawater
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