Design and Implementation of Carrying Scheme of 3G and 4G Station Backhaul Based on IPRAN [PDF]
, 2015 随着3G无线数据流量增长和4G牌照的发放，同时为了满足人们对信息交流方式多样性的需求，数据业务逐渐成为通讯运营商盈利的重要增长点和网络承载的主体。本文以某通讯运营商3G及4G基站IPRAN网络改造为背景，从对承载网的现状分析入手，详细分析了该运营商移动基站承载网的现状、存在的问题，详细地论述了该运营商移动基站承载网升级改造的方案设计和实现的整个过程。本课题网络改造方案的设计包含了较多网络的前沿技术，其应用适应性较强，对新一代承载网络的建设和发展方向具有一定的参考作用。 论文主要研究内容包括以下几点： 1.
金盟博
core
Experimental analysis on residual ultimate bearing capacity of thin plate with internal explosion dent damage under biaxial compression [PDF]
ObjectivesIn modern naval warfare, advancements in weaponry have significantly increased the vulnerability of ships to explosion impacts. Precision-guided weapons, in particular, pose a significant threat, as internal explosions within ship cabins can ...
Lei AO +5 more
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Jianzhu Gangjiegou Jinzhan, 2021 为了研究部分包裹混凝土组合(PEC)柱(弱轴)与型钢梁对穿高强螺栓端板连接节点的抗震性能,考虑端板厚度、盖板厚度以及节点构造形式3个参数,设计了两种不同构造的梁柱节点,对其进行低周往复荷载试验和有限元模拟,分析了各设计参数对试验节点滞回性能、承载能力、节点刚度、延性和耗能能力等指标的影响。研究结果表明:盖板厚度由14mm增加至16mm时,节点承载力提高了33.91%,初始刚度提高了14.9%,延性降低了18.9%;端板厚度由12mm增加至14mm时,节点承载力提高了19.93%,初始刚度提高了15.1%,
赵根田 +5 more
doaj
Tests on Scoring Resistanceof Through Hardened Gears
Jixie chuandong, 1994 按齿轮胶合承载能力试验方法（ＧＢ／Ｔ１３６７２—９２）对４０ＣｒＮｉ２Ｍｏ中硬台面齿轮进行了胶合承载能力试验，试验测定该种齿轮的抗胶合承载能力失效载荷级为６级。铁谱分析很好地反映了胶合发生时抽样中磨粒的变化情况。
赵兴中 +3 more
doaj
Failure behavior analysis of high stiffener web height I-girders of cruise ships considering initial welding defects [PDF]
ObjectiveHigh stiffener web height I-girders on large cruise ships are made of thin welded plates, which lead to noticeable weld distortion and stresses during manufacturing, and can affect the load-bearing characteristics of the structure. Therefore, in
Chen CHEN +4 more
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Anisotropy and energy evolution mechanism of rock mass under true triaxial loading-unloading [PDF]
, 2023 In the process of underground excavation, the surrounding rock is in a very complex stress environment, especially under the influence of its anisotropy, the occurrence of dynamic disaster is hidden.
Chongyan LIU +5 more
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Jianzhu Gangjiegou Jinzhan, 2021 钢板仓组合剪力墙是一种新型抗侧力构件,是以两块钢板和圆管支撑组成基本单元,空腔内填充混凝土的组合剪力墙。基于ABAQUS软件,建立了考虑材料非线性和几何非线性等因素影响的钢板仓组合剪力墙有限元分析模型,分析了钢板仓组合剪力墙圆管支撑布置密度、轴压比、含钢率及高宽比对其水平承载力和延性性能的影响。分析结果表明,钢板仓组合剪力墙具有较高的水平承载力和良好的变形能力,圆管支撑的布置密度对其延性性能和变形能力影响较大。支撑布置方式选用无支撑、1列(1×5)、2列(2×5)、3列(3×5)四种方式 ...
郁有升, 王轩
doaj
Research on Structural Design and Mechanical Behavior of Double Arc Tooth Profile Harmonic Drive [PDF]
, 2015 谐波齿轮减速器是一种传动精度高、减速比大并能够在密闭空间传动的齿轮传动机构，应用领域广泛，尤其在航空航天领域有不可替代的优势。常用的渐开线齿廓齿根处会出现应力集中以及齿顶产生尖点啮合现象，影响其承载性能和啮合质量。双圆弧齿形谐波齿轮以其良好的承载能力与啮合性能逐渐成为研究热点，本文根据谐波齿轮设计理论设计了双圆弧谐波齿轮装置，并对其结构性能、接触特性以及动力学等方面的分析，探索相关规律，为后续在结构优化、增强啮合性能提供了一定的理论依据。 论文主要包括以下几方面内容： 1 ...
王萌萌
core
Analysis of optimization characteristics of titanium alloy double layer stiffened cylindrical shell structure under different design requirements [PDF]
ObjectiveIn order to explore the characteristics of optimization design schemes of titanium alloy double layer stiffened cylindrical shell structures under different length-to-diameter ratios and calculation pressures, a mathematical model for the ...
Jun LIU +4 more
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Design of flexible track and kinematics simulation of inspection robot in fully-mechanized mining face [PDF]
, 2022 The problems of narrow space, frequent operation of equipment and complex positional relationship in coal mine fully-mechanized mining face make it difficult for the conventional inspection robot to run directly on the mining face and automated ...
Chuanwei WANG +3 more
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