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Implementation of sinh method in integration space for boundary integrals with near singularity in potential

Guizhong XIE,Dehai ZHANG,Jianming ZHANG,Fannian MENG,Wenliao DU,Xiaoyu WEN

《机械工程前沿（英文）》 2016年第11卷第4期页码 412-422 doi: 10.1007/s11465-016-0396-8

摘要：

As a widely used numerical method, boundary element method (BEM) is efficient for computer aided engineering (CAE). However, boundary integrals with near singularity need to be calculated accurately and efficiently to implement BEM for CAE analysis on thin bodies successfully. In this paper, the distance in the denominator of the fundamental solution is first designed as an equivalent form using approximate expansion and the original sinh method can be revised into a new form considering the minimum distance and the approximate expansion. Second, the acquisition of the projection point by Newton-Raphson method is introduced. We acquire the nearest point between the source point and element edge by solving a cubic equation if the location of the projection point is outside the element, where boundary integrals with near singularity appear. Finally, the subtriangles of the local coordinate space are mapped into the integration space and the sinh method is applied in the integration space. The revised sinh method can be directly performed in the integration element. A verification test of our method is proposed. Results demonstrate that our method is effective for regularizing the boundary integrals with near singularity.

关键词： computer aided engineering (CAE) boundary element method (BEM) near singularity sinh method coordinate transformation integration space

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美国空间基础设施领域军民商一体化发展的经验及启示

郭姣姣, 李德仁, 王礼恒, 马雪梅,徐源

《中国工程科学》 2020年第22卷第1期页码 133-138 doi: 10.15302/J-SSCAE-2020.01.017

摘要：

空间基础设施领域已成为军民商一体化发展的核心领域，战略价值凸显。本文采用文献调研和情报分析相结合的研究方法，梳理了美国空间基础设施的基本情况和发展趋势；重点从顶层战略、政策法规、组织管理等方面着手，对美国空间基础设施军民商一体化发展进行深入剖析，总结提炼其成功经验，以期为我国空间基础设施规划和建设提供参考借鉴。研究发现，未来我国需进一步谋划空间基础设施领域军民商一体化发展；设立专门机构，统筹协调空间基础设施建设和应用相关单位；加强卫星应用技术的研发与攻关，奠定装备发展的技术基础；完善政策法规体系，保障空间基础设施领域军民商一体化发展。

关键词：空间基础设施军民商一体化发展趋势美国

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我国空间应用发展总体构想

李帅 ,申志强 ,侯宇葵 ,伏瑞敏 ,张拯宁 ,姜彬 ,孙慧洁 ,白照广,张庆君 ,戚发轫

《中国工程科学》 2023年第25卷第2期页码 67-78 doi: 10.15302/J-SSCAE-2023.02.008

摘要：

空间应用指利用空间资源、空间资产及空间特殊条件，在地面或空间进行直接和间接的技术利用、产品生产、服务供给的总称；经过60 多年的发展建设，我国航天事业成就突出，在轨卫星资源超过400 颗，但与空间应用密切相关的体系设计、基础数据库和标准建设等方面还不能满足高质量发展的需要。本文面向航天强国建设和航天系统中长期发展需求，在研判国内外发展环境和形势的基础上，总结了我国空间应用产业与技术发展的新态势和新需求，梳理了空间应用领域发展面临的挑战；提出了面向航天强国建设的空间应用发展总体思路、建设目标、顶层体系，论证形成了空间应用发展的重点方向。研究建议，完善政策法规，推动法治航天建设；转变发展理念，推进天、地、用一体化；优化体制机制，大幅提升服务水平，推进形成天、地、用互促发展，标准统一，协调健康的空间应用新格局。

关键词：空间应用体系；天地一体；应用工程；空间应用方向

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空间激光通信技术发展现状及展望

王天枢,林鹏,董芳,刘显著,马万卓,付强

《中国工程科学》 2020年第22卷第3期页码 92-99 doi: 10.15302/J-SSCAE-2020.03.014

摘要：

空间激光通信技术是未来空间宽带信息传输的主要通信技术，具有带宽高、传输快速便捷及成本低的优势，是解决信息传输“最后一千米”的最佳选择。本文旨在系统把握空间激光通信技术的发展脉络，系统梳理了国内外空间激光通信技术在星地、星间、空地、空空等链路的研究与试验验证的发展情况，总结了激光通信技术在捕获跟踪、通信收发、大气补偿和光机设计等方向的关键技术研究热点。在此基础上，面向未来需求，归纳了空间激光通信技术在高速率、网络化、多用途、一体化、多谱段5 个方面的发展趋势。为进一步推动空间激光通信技术研究和产业化的发展，本文从实施基础研究计划、重视核心元器件研发、积极参与国际技术标准的制定以及引导相关产业发展4 个方面提出了发展建议，以期更好地促进我国空间激光通信技术的成果转化和应用。

关键词：空间激光通信，天地一体化信息网络，高速率，激光组网，一对多激光通信

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The “Tiangong” Chinese Space Station project

Yang HONG

《工程管理前沿（英文）》 2018年第5卷第2期页码 278-283 doi: 10.15302/J-FEM-2018202

关键词： manned space station space station project basic design

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Creation and integration mechanism of instrumentation flexible developing system

Xiaoli XU, Qiushuang LIU

《机械工程前沿（英文）》 2011年第6卷第2期页码 235-240 doi: 10.1007/s11465-011-0122-5

摘要：

To solve many key technical problems during the development of modern instrumentation system integration and provide a new mode and fundamental technical equipment for the research and development (R&D) of modern instrumentation products, based on the concept of an instrumentation flexible developing system (IFDS), this paper discusses the creation and open flexible integration mechanism, perfects the integrated supporting environment and integrated system of the flexible interconnection, and constructs the new flexible integrated system. Based on the operation mechanism of the modern instrumentation developing system and the research and optimization of the rapid integration design method, the paper emphasizes the dynamic integrating method of multiple types of knowledge in a modern instrument R&D system, to effectively utilize the rich integrated resource and achieve rapid integration of the system. Applications show that the new IFDS can improve the integration level and efficiency of R&D of the modern instrumentation system, enforce the reliability of the system, shorten the R&D period, and reduce the development costs.

关键词： modern instrumentation developing flexible interconnection flexible integration mechanism rapid integration system dynamic integrating method

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地下空间支撑下的城市轨道交通和能源系统融合发展研究

秦博宇,王宏振,王召健,熊自明,赵金龙,卢浩,王明洋

《中国工程科学》 2023年第25卷第1期页码 45-59 doi: 10.15302/J-SSCAE-2023.01.014

摘要：

城市因人口、经济活动高度集中而产生极大的能源消耗量，也是各类风险高度集聚的重点区域；能源和交通作为城市碳减排的重点领域、城市“生命线”工程的重要组成部分，进行融合发展对于城市绿色低碳、安全韧性建设具有重要价值。本文梳理了城市轨道交通与能源领域的低碳韧性发展现状，涵盖城市轨道交通低碳发展、城市轨道交通与能源系统韧性评估及提升、储能系统安全防控及风险评估三方面；提出了地下空间支撑下的城市轨道交通多能源融合系统构想，阐述了常态时期、极端条件下相应系统的运行模式；从环境、经济、社会角度分析了城市轨道交通多能源融合系统的潜在效益，展望了构想系统的未来研究方向与可能的解决思路。研究建议，完善城市轨道交通多能源融合系统政策机制，推进多部门协同治理；构建城市轨道交通多能源融合系统科技创新体系，助力实现城市轨道交通低碳、安全、高效运行；推动城市电网和轨道交通协同管理体系建设，增强城市“生命线”工程韧性治理能力。

关键词：地下空间；城市轨道交通；交通 ‒能源融合；可再生能源；储能安全防护

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Application and development of modern long-span space structures in China

Shilin DONG, Yang ZHAO, Dong XING

《结构与土木工程前沿（英文）》 2012年第6卷第3期页码 224-239 doi: 10.1007/s11709-012-0166-6

摘要： Modern long-span space structures, developed during the 1970s and 1980s, are light and effective structures based on new technologies and light-weight high-strength materials, such as membranes and steel cables. These structures include air-supported membrane structures, cable-membrane structures, cable truss structures, beam string structures, suspen-domes, cable domes, composite structures of cable dome and single-layer lattice shell, Tensairity structures and so forth. For the premodern space structures widely used since the mid-twentieth century (such as thin shells, space trusses, lattice shells and ordinary cable structures), new space structures have been developed by the combination of different structural forms and materials. The application of prestressing technology and the innovation of structural concepts and configurations are also associated with modern space structures, including composite space trusses, open-web grid structures, polyhedron space frame structures, partial double-layer lattice shells, cable-stayed grid structures, tree-type structures, prestressed segmental steel structures and so forth. This paper provides a review of the structural characteristics and practical applications in China of modern rigid space structures, modern flexible space structures and modern rigid-flexible combined space structures.

关键词： modern long-span space structures rigid space structures flexible space structures rigid-flexible combined space structures application and development

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统筹空间科学、空间技术、空间应用协调发展的思考

周建平,吴季

《中国工程科学》 2023年第25卷第2期页码 59-66 doi: 10.15302/J-SSCAE-2023.02.007

摘要：

我国航天事业因历史原因和投入限制，在初期以空间技术、空间应用为主，对空间科学重视不足，空间科学、空间技术、空间应用基本上是独立发展的；着眼新时期航天强国建设，需要将空间技术的发展深度融合到空间科学、空间应用中去，从而创造新的机遇和成就。本文剖析了空间科学、空间技术、空间应用的基本内涵并明确三者的相互关系，在系统分析国际空间科学、空间技术、空间应用的整体态势，细致梳理我国相关领域发展情况的基础上，论证了统筹我国空间科学、空间技术、空间应用协调发展的必要性，凝练了三者协调发展面临的主要问题。空间科学、空间技术、空间应用之间既有需求交叉，又可互促带动，应在规划、部署、实施的全过程中进行统筹考虑：发挥新型举国体制优势，在统一管理下做好顶层规划；坚持创新驱动发展战略，以技术进步抢占国际航天制高点；支持空间领域基础研究，培育高水平的科学家和工程师队伍；加强资源统筹协调，促进空间应用数据的合理开放和充分利用。

关键词：航天事业；空间科学；空间技术；空间应用；协调发展；数据开放共享

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空间物理和空间天气探测与研究

王赤

《中国工程科学》 2008年第10卷第6期页码 41-45

摘要：

空间物理学是1957年人造卫星发射成功后迅速发展起来的一门交叉学科。近50年来，空间已成为人类生存的第四环境，其重要性日益突出。20世纪90年代初，空间物理学与空间应用的密切结合产生了专门研究和预报空间环境中灾害性过程及其变化规律，减轻或防止空间灾害并为人类活动服务的空间天气学。文章简要总结了国外及国内空间物理和空间天气探测的历程和发展趋势，并提出对我国未来空间物理和空间天气探测发展规划和探测路线图的几点建议。

关键词：空间物理空间天气空间物理探测发展规划

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深空安全研究现状与未来发展

吴克,张哲,杨文飞,何建峰,张天柱,简抗抗,吴伟仁

《中国工程科学》 2022年第24卷第4期页码 240-248 doi: 10.15302/J-SSCAE-2022.04.023

摘要： Managing space radiation risk in the new era of space exploration [R].Managing space radiation risk in the new era of space exploration [R].Human space exploration the next fifty years [J].Human space exploration the next fifty years [J].Human space exploration the next fifty years [J].

关键词：深空安全空间辐射威胁行星保护太空遗产保护空间立法

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Persistent Integration and Innovation Management Mode and Its Applications in Petroleum Production Engineering

He Liu

《工程管理前沿（英文）》 2015年第2卷第4期页码 339-343 doi: 10.15302/J-FEM-2015055

摘要： This paper proposes a new management mode named the persistent integration and innovation management mode to satisfy the requirements by the fast development at oilfields. Taking engineering philosophy as the guidance and technical innovations in petroleum production engineering as the breaking point, the management mode combines long term production practice at oilfields with modern management methods. The management mode integrates intellectuals, techniques, capital, and information and so on to accomplish global optimization of resource configuration. Sets of new techniques, new methods, new technologies and new equipment in petroleum production engineering have been proposed under the guidance of the management mode, achieving great social and economic benefits.

关键词： integration and innovation engineering philosophy petroleum production engineering Daqing Oilfield

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Optimization and simultaneous heat integration design of a coal-based ethylene glycol refining process

《化学科学与工程前沿（英文）》 2023年第17卷第9期页码 1280-1288 doi: 10.1007/s11705-023-2301-4

摘要： Coal to ethylene glycol still lacks algorithm optimization achievements for distillation sequencing due to high-dimension and strong nonconvexity characteristics, although there are numerous reports on horizontal comparisons and process revamping. This scenario triggers the navigation in this paper into the simultaneous optimization of parameters and heat integration of the coal to ethylene glycol distillation scheme and double-effect superstructure by the self-adapting dynamic differential evolution algorithm. To mitigate the influence of the strong nonconvexity, a redistribution strategy is adopted that forcibly expands the population search domain by exerting external influence and then shrinks it again to judge the global optimal solution. After two redistributive operations under the parallel framework, the total annual cost and CO₂ emissions are 0.61%/1.85% better for the optimized process and 3.74%/14.84% better for the superstructure than the sequential optimization. However, the thermodynamic efficiency of sequential optimization is 11.63% and 10.34% higher than that of simultaneous optimization. This study discloses the unexpected great energy-saving potential for the coal to ethylene glycol process that has long been unknown, as well as the strong ability of the self-adapting dynamic differential evolution algorithm to optimize processes described by the high-dimensional mathematical model.

关键词： ethylene glycol redistribution heat integration optimization parallel framework

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ENTREPRENEURIAL OPPORTUNITY, VALUE EVOLUTION, AND ORGANIZATIONAL INTEGRATION OF PROFESSIONAL FARMER ENTREPRENEURSHIP

《农业科学与工程前沿（英文）》 2023年第10卷第1期页码 135-148 doi: 10.15302/J-FASE-2022464

摘要：

● The choice of a modern agriculture project was found to be rational for professional farmers to reduce interference from non-market factors. The success of this project is due to its capacity to successfully fill the structural hole in the market transaction network.

关键词： Benefit-linked mechanism featured agriculture organizational integration professional farmers rural cooperative structural hole theory

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Equipment–process–strategy integration for sustainable machining: a review

《机械工程前沿（英文）》 2023年第18卷第3期 doi: 10.1007/s11465-023-0752-4

摘要： Although the manufacturing industry has improved the quality of processing, optimization and upgrading must be performed to meet the requirements of global sustainable development. Sustainable production is considered to be a favorable strategy for achieving machining upgrades characterized by high quality, high efficiency, energy savings, and emission reduction. Sustainable production has aroused widespread interest, but only a few scholars have studied the sustainability of machining from multiple dimensions. The sustainability of machining must be investigated multidimensionally and accurately. Thus, this study explores the sustainability of machining from the aspects of equipment, process, and strategy. In particular, the equipment, process, and strategy of sustainable machining are systematically analyzed and integrated into a research framework. Then, this study analyzes sustainable machining-oriented machining equipment from the aspects of machine tools, cutting tools, and materials such as cutting fluid. Machining processes are explored as important links of sustainable machining from the aspects of dry cutting, microlubrication, microcutting, low-temperature cutting, and multidirectional cutting. The strategies for sustainable machining are also analyzed from the aspects of energy-saving control, machining simulation, and process optimization of machine tools. Finally, opportunities and challenges, including policies and regulations toward sustainable machining, are discussed. This study is expected to offer prospects for sustainable machining development and strategies for implementing sustainable machining.

关键词： sustainable machining equipment process strategy manufacturing