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Sustainable Improvement of Water Quality in Urban River Network by Rotating Overflow Weir—Case Study of Changzhou City in China 基于旋转溢流堰的城市河网水质可持续改善——以常州市为例
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35581
Liu Yang, Xie Chen, Fan Ziwu, Yang Fan, Yang Chang, L. Guoqing
Water diversion is a practical and commonly used approach to improve the water quality of rivers in urban plains in China. This paper researches using rotating overflow weirs as the primary engineering solution to facilitate water diversion and improve the water quality of the river network in urban plain area of Changzhou, including hydrodynamic modeling, field tests, and application. The water diversion scheme, including clean water source, water transfer paths, quantity, and rate, was designed based on its current terrain and river systems. The Yangtze River was selected as a high-quality water source, and its two tributaries were utilized as clean water paths. Four rotating overflow weirs were proposed to create three stages of hydraulic gradient. Clean water can flow naturally and orderly in the researched urban river network without pumps. The required clean headwater level and clean water distributions were modeled hydrodynamically. Four temporary weirs were constructed at design locations to conduct field tests. And the water diversion scheme and its water quality improvement had been verified by field tests. Afterward, four permanent rotating overflow weirs were built. Currently, the monitoring results show the design water transfer scheme reaches expectations. The flow velocity in most rivers has been increased to 7cm/s from standstill in Changzhou's main urban plain area. The composite water quality of 93% river cross-sections monitored has been improved from Class V to Class III and all have been improved to Class IV and above.
调水是中国城市平原河流水质改善的一种实用且常用的方法。本文研究了以旋转溢流堰作为常州市平原区河网引水改善水质的主要工程方案,包括水动力建模、现场试验和应用。根据目前的地形和水系,设计了调水方案,包括清洁水源、调水路径、水量和调水速率。选择长江作为优质水源,利用其两条支流作为清洁水源。设计了四个旋转溢流堰,形成三级水力梯度。研究的城市水网在没有水泵的情况下,能够实现清洁水的自然有序流动。对所需的清洁源头水位和清洁水源分布进行了水动力学模拟。在设计地点建造了四个临时堰,以进行实地试验。并通过现场试验验证了引水方案及其对水质的改善效果。之后,建造了四个永久性旋转溢流堰。目前监测结果表明,设计调水方案达到预期效果。常州市主城区平原区大部分河流流速已由停滞状态提高到7cm/s。93%的监测断面综合水质由V类改善到III类,全部改善到IV类及以上。
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引用次数: 0
Cavitation Erosion Behaviour of Martensitic Stainless Steels SUS 420J2 and SUS440C by High Pressure Liquid Jet 高压液体射流对马氏体不锈钢sus420j2和SUS440C空化腐蚀行为的影响
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35515
Haisong Xu, Q. Dong
The high-pressure cavitation erosion (CE) behavior of SUS420J2 and SUS440C were studied by a high pressure cavitating liquid jet experiment apparatus, according to ASTM Standard G134-95. The microstructures were investigated by X-ray diffraction and scanning electron microscopy to determine the phases and precipitates. The mass loss vs. exposure time relations indicated that SUS440C had longer incubation time and a decreasing erosion rate. The eroded topographical evolution was investigated, indicating that the initiation of cavitation erosion was accumulated from grain boundaries for SUS420J2, and from M3C precipitates or ferric oxide inclusions for SUS440C. The dominant factors that influenced CE behaviors changed in different cavitation stages. Micro-pitting and initial damage induced by grain boundaries or precipitates were the dominant erosion forms during the incubation stage; however, the matrix hardness started to prevail as the dominant factor after the precipitates had been torn off, or grain boundaries damage disappeared.
根据ASTM标准G134-95,采用高压空化液体射流实验装置研究了SUS420J2和SUS440C的高压空化侵蚀(CE)行为。采用x射线衍射和扫描电镜对其微观组织进行了研究,确定了相和析出物。质量损失与暴露时间的关系表明,SUS440C的培养时间较长,腐蚀速率逐渐降低。研究了侵蚀的地形演变,表明SUS420J2的空化蚀起始于晶界,SUS440C的空化蚀起始于M3C沉淀或氧化铁夹杂。影响CE行为的主导因素在不同的空化阶段有所不同。微点蚀和晶界或析出相的初始损伤是孕育阶段的主要侵蚀形式;而在析出相被撕裂或晶界损伤消失后,基体硬度开始占主导地位。
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引用次数: 0
An Ontology Based Methodology for Capability Requirements Analysis and Verification of the Military Information System 基于本体的军事信息系统能力需求分析与验证方法
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35534
Zhihuai Li, Z. Qu, Gang Zhu, Shi-Ji Yang, Hua Liu
To solve the problem of capability requirements analysis and verification of the military information system, a new method based on ontology is proposed in this paper. Firstly, meta ontology of capability requirements is designed based on its analysis process. And then meta ontology is instantiated to construct the capability requirements model according to the scenario of specific applications. Secondly, the data completeness and data consistency rules of the model are extracted from the ontology directly according to the relations among the data entities of the ontology, and the data entities are used to develop the verification matrixes, which are utilized to judge the data completeness and data consistency of requirements model. Finally, a typical example is given to illustrate the implementation process of our method, and the results demonstrate its feasibility and validity.
针对军事信息系统的能力需求分析与验证问题,提出了一种基于本体的能力需求分析与验证方法。首先,根据能力需求元本体的分析过程,设计了能力需求元本体。然后实例化元本体,根据具体应用场景构建能力需求模型。其次,根据本体论数据实体之间的关系,直接从本体论中提取模型的数据完整性和数据一致性规则,并利用数据实体建立验证矩阵,用于判断需求模型的数据完整性和数据一致性;最后,通过一个典型实例说明了该方法的实现过程,结果验证了该方法的可行性和有效性。
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引用次数: 0
Design, Simulation and Experimental Verification of Chip-Level Cracking Structure 芯片级开裂结构的设计、仿真与实验验证
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35517
Yu Xiao, Zhang Zhengyuan, Liao Xiyi, Jiang Feiyu, Wang Yan
To quickly destroy chip and ensure information security, the author designed a cracking structure of transient-failure integrated circuit in this paper. By placing the Ni-Cr film resistance and the energetic material between the chip and the package and heating the resistance by an electric current, the energetic material expanded and the chip cracked. The information on the chip was destroyed, destroying the information on the chip. The author simulated the temperature distribution and stress of the power-on structure in different sizes by ANSYS software. The simulation results indicate that, the chip cracks within 50ms under the trigger current of 0.5A when a circular groove with an area of 1mm2 and depth of 0.1mm is filled with an expansion material with an expansion coefficient of 105·°C-1. Then the author prepared a sample for experimental verification. Experimental results show that the sample chip quickly cracks and fails within 10ms under the trigger current of 1A. The simulation and experimental results confirm the feasibility of the structure in quick destruction, which lays the foundation for developing instantaneous-failure integrated circuit products to meet information security applications.
为了快速销毁芯片,保证信息安全,本文设计了一种瞬态失效集成电路的开裂结构。通过在芯片和封装之间放置镍铬薄膜电阻和含能材料,并通过电流加热电阻,含能材料膨胀,芯片开裂。芯片上的信息被破坏了,芯片上的信息被破坏了。利用ANSYS软件对不同尺寸的通电结构进行了温度分布和应力模拟。仿真结果表明,在0.5A触发电流下,在面积为1mm2、深度为0.1mm的圆槽内填充膨胀系数为105·°C-1的膨胀材料,芯片在50ms内发生裂纹。然后制备样品进行实验验证。实验结果表明,在1A的触发电流下,样品芯片在10ms内快速破裂失效。仿真和实验结果验证了该结构在快速破坏下的可行性,为开发满足信息安全应用的瞬时失效集成电路产品奠定了基础。
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引用次数: 0
Indirect Measurement of the Cutting Power Based on Spindle Motor Current 基于主轴电机电流的切削功率间接测量
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35529
Yang Xie, Chaoyong Zhang, Qiong Liu
Enhancing energy efficiency of machine tools can significantly improve the environmental performance of machining systems, and acquisition of cutting power is the key to solve this problem. However, the approach that the cutting power is directly measured by the dynamometer can’t be utilized in real life application. In this paper, a cutting power estimation model, based on the inexpensive and non-invasive spindle motor total current and spindle idle current measurement, is proposed for the intermittent cylindrical turning operation. Novel signal processing strategies have been proposed for extracting useful features from the measured signals. Some experiments are performed on a CNC lathe HCK60 for the identification of the load meter constant and the analysis of the estimate error. As a result, it shows the effectiveness of the proposed method for estimation of cutting power, which can enhance the overall productivity of the machining process by optimally selected cutting parameters from the predicted model.
提高机床的能效可以显著改善加工系统的环境性能,而切削功率的获取是解决这一问题的关键。但是,直接用测功机测量切削功率的方法不能在实际应用中得到应用。针对间歇性圆柱车削加工,提出了一种基于廉价、无损伤的主轴电机总电流和主轴空闲电流测量的切削功率估算模型。为了从测量信号中提取有用的特征,提出了新的信号处理策略。在HCK60数控车床上进行了负荷计常数的辨识实验,并对其估计误差进行了分析。结果表明,所提出的切削功率估计方法是有效的,可以通过从预测模型中优选切削参数来提高加工过程的整体生产率。
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引用次数: 0
Performance Analysis of Passive Radar System Based On GPS Signal 基于GPS信号的无源雷达系统性能分析
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35544
Wei Qu, Gang Yao
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引用次数: 0
The Design and Optimization of Swing Automatic Paper Folding Mechanism 摆动式自动折纸机构的设计与优化
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35538
Yan Dongfeng, Jin Shoufeng, Xiao Zhang, Ku Pengtao
In order to solve the multi-directional bending problem of paper cards with different specifications, a swing type automatic paper folding mechanism was designed. Through gear rack mechanism and rocker slider mechanism, the paper card can be folded vertically and horizontally for many times. The MATLAB optimization function library is used to optimize the rocker, connecting rod, swing angle and other size parameters of the mechanism, and the swing angle of the bending block is determined to be 15 degrees. The motion equation of paper folding process is solved by vector equation and coordinate transformation, and kinematics simulation of swing paper folding mechanism is carried out by motion plug-in of SolidWorks. The simulation results show that the mechanism can meet the motion requirements of the waist seal, and the simulation parameters are consistent with the calculation parameters.
为解决不同规格纸卡的多向折纸问题,设计了一种摆动式自动折纸机构。通过齿轮齿条机构和摇杆滑块机构,实现纸卡的垂直和水平多次折叠。利用MATLAB优化函数库对机构摇杆、连杆、摆角等尺寸参数进行优化,确定弯块摆角为15度。利用矢量方程和坐标变换求解折纸过程的运动方程,利用SolidWorks的运动插件对摆动式折纸机构进行运动学仿真。仿真结果表明,该机构能够满足腰封的运动要求,仿真参数与计算参数基本一致。
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引用次数: 0
Effect of Texture Shape on Texture’s Frictional Response 纹理形状对纹理摩擦响应的影响
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35524
Dinghuai Yang, Junjie Zhang
A reasonably designed surface texture can effectively control the frictional properties of the textured substrate. The texture shape has an important influence on the frictional properties of the textured substrate. The ABAQUS software based on the CEL algorithm was used to compare the friction reduction mechanism of the square groove-like texture and the V-shaped groove-like texture, and the uniformity of the texture shape on the frictional properties of the texture was obtained. The simulation results show that the shape of the texture affects the frictional properties of the textured substrate under lubricating conditions by affecting the stress concentration phenomenon generated on the surface of the textured substrate and the hydrodynamic lubrication effect of the texture. This has certain reference significance for the design and selection of texture shapes and the improvement of the accuracy of lubrication models.
合理设计表面织构可以有效控制织构基板的摩擦性能。织构形状对织构基板的摩擦性能有重要影响。采用基于CEL算法的ABAQUS软件对方形类沟槽纹理和v形类沟槽纹理的减摩机理进行了比较,得到了纹理形状对纹理摩擦性能的均匀性。仿真结果表明,织构形状通过影响织构基材表面产生的应力集中现象和织构的流体动力润滑效果,影响了润滑条件下织构基材的摩擦性能。这对织构形状的设计和选择以及润滑模型精度的提高具有一定的参考意义。
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引用次数: 0
Simulation and Analysis of the Posture of Walking Board of "One-Pull-Four" Tension Stringing in Small Span Length 小跨度“一拉四”张拉绳行走板姿态仿真分析
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35543
W. Yi, Kui Luo, Li Gang, Wenchuan Jing, He Chaoming
With respect of the gap in current "one-pull-four" tension stringing simulation calculation, a "one-pull-four" tension stringing numerical simulation model is established relying on the Ya'an II~Ziyang 500kV line project, based on ADAMS software, and the posture of walking board is discussed to obtain the influence relationship between the central deflection coefficient of the conductor and the posture of the two in this paper. In the range of small span length, the method of selecting the value of central deflection coefficient suitable for conductor steering is determined through simulation analysis of steering, which provides a basis for the actual construction of power transmission and transformation lines.
在小跨距范围内,通过对导线转向的仿真分析,确定了适合导线转向的中心偏转系数取值的选择方法,为输变电线路的实际建设提供了依据。
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引用次数: 0
Review of Research on Big Data Technology in the Field of Petroleum Exploration 石油勘探领域大数据技术研究综述
Pub Date : 2021-04-07 DOI: 10.12783/DTMSE/AMEME2020/35575
Ke Hou, Xinhao Li, Mingcheng Guo
In the era of big data, the rich data resources of the petroleum industry not only provide auxiliary decision-making support for the production and scientific research of petroleum enterprises, but also play a vital role in the digital transformation of enterprises. From the perspective of petroleum exploration data management technology, this paper divides its past development process into database technology stage, data warehouse technology stage, data lake technology stage, data integration platform stage, and special application of big data technology by combing the relevant literature. At present, it is in the initial stage of the construction of the data middle office. The core problem that needs to be solved is to match the calculation type with the most suitable computing framework, optimize the allocation of computing resources, and give full play to the processing capabilities of the data middle office.
在大数据时代,石油行业丰富的数据资源不仅为石油企业的生产和科研提供辅助决策支持,而且在企业数字化转型中发挥着至关重要的作用。本文从石油勘探数据管理技术的角度出发,通过梳理相关文献,将其过去的发展历程分为数据库技术阶段、数据仓库技术阶段、数据湖技术阶段、数据集成平台阶段以及大数据技术的特殊应用。目前处于数据中办建设的初级阶段。需要解决的核心问题是将计算类型与最合适的计算框架匹配起来,优化计算资源的配置,充分发挥数据中台的处理能力。
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引用次数: 0
期刊
DEStech Transactions on Materials Science and Engineering
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