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Assembly design system based on engineering connection

Wensheng YIN

《机械工程前沿（英文）》 2016年第11卷第4期页码 423-432 doi: 10.1007/s11465-016-0382-1

摘要：

An assembly design system is an important part of computer-aided design systems, which are important tools for realizing product concept design. The traditional assembly design system does not record the connection information of production on the engineering layer; consequently, the upstream design idea cannot be fully used in the downstream design. An assembly design model based on the relationship of engineering connection is presented. In this model, all nodes are divided into two categories: The component and the connection. Moreover, the product is constructed on the basis of the connection relationship of the components. The model is an And/Or graph and has the ability to record all assembly schemes. This model records only the connection information that has engineering application value in the product design. In addition, this model can significantly reduce the number of combinations, and is very favorable for the assembly sequence planning in the downstream. The system contains a connection knowledge system that can be mapped to the connection node, and the connection knowledge obtained in practice can be returned to the knowledge system. Finally, VC++6.0 is used to develop a prototype system called Connect-based Assembly Planning (CAP). The relationship between the CAP system and the commercial assembly design system is also established.

关键词： product design assembly design engineering connection assembly sequence planning

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Mouth the mirror of lungs: where does the connection lie?

null

《医学前沿（英文）》 2016年第10卷第4期页码 405-409 doi: 10.1007/s11684-016-0476-5

摘要：

Periodontitis is the chronic destructive disease of the periodontium (Gums) caused by host bacterial interactions. The effect of such host bacterial interactions in oral cavity also evokes a systemic response. Numerous studies have found common mechanisms of destruction for periodontal diseases and other chronic diseases like diabetes mellitus, atherosclerosis, respiratory diseases, and adverse pregnancy outcomes. Oral colonization by respiratory pathogens appears to be a risk factor for development of respiratory diseases and oral interventions aimed at reducing oral bacterial count have resulted in reduced incidence of these reparatory illness. This reflects the importance of oral hygiene among patients with respiratory illness. This review highlights the association between periodontal diseases and respiratory diseases.

关键词： periodontitis respiratory diseases acute pneumonia COPD

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Static behavior of planar intersecting CFST connection in diagrid structure

Ling LI, Xianzhong ZHAO, Ke KE

《结构与土木工程前沿（英文）》 2011年第5卷第3期页码 355-365 doi: 10.1007/s11709-011-0125-7

摘要： Intersecting connection plays an important role in the new diagrid structural system for high-rise buildings. To investigate the static behavior of the intersecting connection of concrete-filled steel tubular (CFST) columns, a typical reduced-scale planner connection specimen is tested under monotonic axial compression. The failure modes, force mechanism and bearing capacity of intersecting CFST connections are analyzed further in the follow-up numerical simulation, considering influences of intersecting angle, elliptical plate and ring plate. Test and simulation results prove that, intersecting connection can develop fully plastic deformation and provide sufficient bearing capacity. Parametric analysis indicates that bearing capacity of planar intersecting CFST connection mainly depends on intersecting angle and thickness of elliptical plate, while the ring plate affects that little. Capacity estimation method for planar intersecting CFST connection is proposed basing on the capacity of the critical section which is located near intersecting center for a distance of steel tube radius, and the design suggestions is provided in the end of this paper.

关键词： diagrid structure concrete-filled steel tube planar intersecting connection experimental research mechanism analysis

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Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

《结构与土木工程前沿（英文）》 2020年第14卷第1期页码 199-214 doi: 10.1007/s11709-019-0592-9

摘要： Stiffened and unstiffened fillet-welded tube-to-transverse plate connection details are widely used for mast-arm and base-plate connections for highway sign structures. However, due to repetitive wind loads, cyclic fatigue stresses are induced and they are the primary source of failure in welded connections at these locations. The resistance of fatigue critical details has been an on-going research topic because of limited experimental results and the variability in existing fatigue testing results. The main objective of this study is to evaluate fatigue resistance of fillet-welded tube connection details by utilizing the advanced fatigue tool in ANSYS Workbench platform. Finite Element (FE) models development and model validation using existing test data was presented. The resulting fatigue resistance from FE analysis was expressed in terms of fatigue life, fatigue damage, and fatigue safety factor to determine the fatigue performance of fillet-welded connections. Existing fatigue test data was grouped to perform a synthetic analysis and then analysis results were provided to determine input data and fatigue limit for the fatigue module. The local stress level at fatigue critical locations was evaluated using a static FE model for different number of stiffeners and boundary conditions. The results of this investigation provides fatigue resistance of fillet-welded connection details in the form of fatigue life, fatigue damage and safety factor for various connection parameters and structural conditions.

关键词： fatigue weld connections base plate fillet welds

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Risk evaluation for the task transfer of an aircraft maintenance program based on a multielement connection

《工程管理前沿（英文）》 2024年第11卷第1期页码 16-31 doi: 10.1007/s42524-023-0282-0

摘要： This paper proposes a framework for evaluating the efficacy and suitability of maintenance programs with a focus on quantitative risk assessment in the domain of aircraft maintenance task transfer. The analysis is anchored in the principles of Maintenance Steering Group-3 (MSG-3) logic decision paradigms. The paper advances a holistic risk assessment index architecture tailored for the task transfer of maintenance programs. Utilizing the analytic network process (ANP), the study quantifies the weight interrelationships among diverse variables, incorporating expert-elicited subjective weighting. A multielement connection number-based evaluative model is employed to characterize decision-specific data, thereby facilitating the quantification of task transfer-associated risk through the appraisal of set-pair potentials. Moreover, the paper conducts a temporal risk trend analysis founded on partial connection numbers of varying orders. This analytical construct serves to streamline the process of risk assessment pertinent to maintenance program task transfer. The empirical component of this research, exemplified through a case study of the Boeing 737NG aircraft maintenance program, corroborates the methodological robustness and pragmatic applicability of the proposed framework in the quantification and analysis of mission transfer risk.

关键词： risk evaluation maintenance steering group analytic network process task transfer maintenance program

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An innovative model for predicting the displacement and rotation of column-tree moment connection under

Mohammad Ali NAGHSH, Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Hamed TAGHAVIZADEH, Mehdi MORADI

《结构与土木工程前沿（英文）》 2021年第15卷第1期页码 194-212 doi: 10.1007/s11709-020-0688-2

摘要： In this study, we carried out nonlinear finite element simulations to predict the performance of a column-tree moment connection (CTMC) under fire and static loads. We also conducted a detailed parameter study based on five input variables, including the applied temperature, number of flange bolts, number of web bolts, length of the beam, and applied static loads. The first variable is changed among seven levels, whereas the other variables are changed among three levels. Employing the Taguchi method for variables 2–5 and their levels, 9 samples were designed for the parameter study, where each sample was exposed to 7 different temperatures yielding 63 outputs. The related variables for each output are imported for the training and testing of different surrogate models. These surrogate models include a multiple linear regression (MLR), multiple Ln equation regression (MLnER), an adaptive network-based fuzzy inference system (ANFIS), and gene expression programming (GEP). 44 samples were used for training randomly while the remaining samples were employed for testing. We show that GEP outperforms MLR, MLnER, and ANFIS. The results indicate that the rotation and deflection of the CTMC depend on the temperature. In addition, the fire resistance increases with a decrease in the beam length; thus, a shorter beam can increase the fire resistance of the building. The numbers of flanges and web bolts slightly affect the rotation and displacement of the CTMCs at temperatures of above 400°C.

关键词： column-tree moment connection Finite element model parametric study fire regression models gene expression programming

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Simulation of grid connection and maximum power point tracking control of brushless doubly-fed generator

Hicham SERHOUD, Djilani BENATTOUS

《能源前沿（英文）》 2013年第7卷第3期页码 380-387 doi: 10.1007/s11708-013-0252-z

摘要： In this paper, based on the analysis of the mathematical model in a common synchronous reference frame of the brushless doubly-fed generator (BDFG), the grid connection strategy and maximum energy extraction control were both analyzed. Besides, the transient simulation of no-load model and generation model of the BDFG have been developed on the MATLAB/Simulink platform. The test results during cutting-in grid confirmed the good dynamic performance of grid synchronization and effective power control approach for the BDFG-based variable speed wind turbines.

关键词： brushless doubly-fed generator (BDFG) modeling grid connection control back-to-back pulse-width modulation (PWM) converter wind power generation

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Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

《结构与土木工程前沿（英文）》 2021年第15卷第2期页码 390-398 doi: 10.1007/s11709-021-0690-3

摘要： Beam–column connections are one of the most critical elements of reinforced concrete structures, especially in seismically active regions, and have been extensively evaluated experimentally and numerically. However, very limited experimental studies about eccentric reinforced concrete connections including the effect of connected slabs are available. This study presents the experimental results of two half-scale eccentric beam-column-slab connections subjected to quasi-static cyclic loading. The horizontal eccentricity ( ) is maintained at 12.5% and 25% of column width ( ) for specimens 1 and 2, respectively. The damage pattern, performance levels, displacement ductility ( ), energy dissipation, and connection strength and stiffness are compared for both specimens, and the effect of eccentricity is evaluated. It is concluded that the eccentricity has no significant effect on the lateral load carrying capacity; however, the overall strength degradation increases with the increase in eccentricity. Similarly, the elastic stiffness of specimen 2 decreased by 14% as the eccentricity increased from 12.5% to 25%; however, the eccentricity had no significant effect on the overall stiffness degradation. decreased by 43%, and the energy dissipation capacity decreased by 40% in specimen 2 with higher eccentricity. The story drifts corresponding to the performance levels of the life safety (LS) and collapse prevention (CP) were found to be 28% lesser in specimen 2 than in specimen 1.

关键词： corner connection eccentricity strength degradation stiffness degradation energy dissipation performance levels

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基于智能网联的特种设备智能制造发展思路分析

刘三江,陈祖志,石坤,李光海

《中国工程科学》 2020年第22卷第6期页码 143-150 doi: 10.15302/J-SSCAE-2020.06.019

摘要：

特种设备是国民经济建设和社会生活的重要基础设施，在特种设备领域发展智能制造、实现特种设备制造业的转型升级，是“中国制造 2025”的重要组成部分。本文分析了特种设备的特点及发展现状，梳理了发展特种设备智能制造的需求情况，提出了推动特种设备制造业由大变强的有效手段及发展思路。研究提出，发展特种设备智能制造的指导思想是采用并联式发展道路，并行推进特种设备行业工业 2.0、工业 3.0、工业 4.0 的发展；发展重点是产品可追溯、质量管理智能化、动态风险实时监控。在此基础上，引入智能网联技术思路作为特种设备智能制造的发展路径，分析智能网联的技术内涵，着重从特种设备智联网构建、智能应用开发两方面提出了基于该路径的特种设备智能制造关键任务，以期为特种设备领域推进智能制造提供理论参考。

关键词：特种设备智能制造智能网联并联式发展

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大规模海上风电并网送出策略研究

张占奎,石文辉,屈姬贤,白宏

《中国工程科学》 2021年第23卷第4期页码 182-190 doi: 10.15302/J-SSCAE-2021.04.021

摘要：

海上风电是世界风电未来发展的重要方向，经济高效地解决大规模海上风电并网问题是海上风电建设面临的核心挑战之一。本文总结了世界海上风电的发展现状、我国海上风电发展环境及行业进展，归纳了海上风电的全球性发展趋势；从海上风电场单场典型并网、大规模海上风电集群送出两类典型情景出发，梳理了相关技术特征及其代表性应用。在凝练我国海上风电并网送出面临问题的基础上，提出了我国海上风电并网的整体发展策略，并就两类典型情景的送出方案开展适应性分析和评价。研究建议，摸清资源储量、确定统一规划理念，加强自主创新、突破并网关键技术，完善体制机制、确保高质量发展，加强国际交流、促进国际产业合作，以此谋划和建设一流水平、契合国情的海上风电并网送出工程，更好支撑我国能源转型发展。

关键词：海上风电集群并网送出规划方案适应性分析

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智联计算网络技术发展研究

李丹,胡宇翔,潘恒,张建辉,邬江兴

《中国工程科学》 2023年第25卷第6期页码 39-48 doi: 10.15302/J-SSCAE-2023.06.014

摘要：

算网融合的理念和技术处于发展初期，相应计算任务调度、网络互联也处于“脱节”状态，因而把握智联计算网络技术发展趋势并提出自主创新的战略构想及发展路线成为亟需。本文分析了现有信息网络技术面临的挑战，提炼出网络与计算融合发展的主要趋势；论证形成我国自主创新的智联计算网络核心架构，精准阐明智联计算网络的发展目标与预期效益；深入剖析智联计算网络技术发展路线，涵盖多样化协议支撑、“网 ‒ 算 ‒ 存”一体化控制、服务功能智能编排、内生安全构造等智联计算网络关键技术布局，智慧园区网络场景、垂直行业网络场景、数据中心网络场景等智联计算网络示范应用。研究建议，深入创新智联计算网络技术体系，广泛部署智联计算网络示范应用，加速推动智联计算网络产品落地，以此促进智联计算网络技术的演进与应用。

关键词：智联计算网络；多样化协议；“网 ‒ 算 ‒ 存”一体化；服务功能智能编排；内生安全

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井下裂缝连通技术在安棚碱矿的应用

齐铁新,刘建中,秦桂林,董峰

《中国工程科学》 2006年第8卷第7期页码 63-67

摘要：

介绍了在桐柏安棚碱矿，用微地震监测结合水准测量监测与注水井连通的原生裂隙带的理论、技术、方法和监测结果，并据此部署开采井位，把采液井打在与注水井连通的裂隙带上，实现了2条注、采井1 000m米井下裂隙带连通,使安棚碱矿可以连续注水、采出碱液，从而获得较高的生产水平和经济效益。

关键词：安棚碱矿湿法采碱井底裂缝连通水准测量微地震监测

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Experimental study on the compressive performance of new sandwich masonry walls

Jianzhuang XIAO, Jie PU, Yongzhong HU

《结构与土木工程前沿（英文）》 2013年第7卷第2期页码 154-163 doi: 10.1007/s11709-013-0203-0

摘要： Sandwich masonry wall, namely, multi-leaf masonry wall, is widely applied as energy-saving wall since the interlayer between the two outer leaves can act as insulation layer. New types of sandwich walls keep appearing in research and application, and due to their unique connection patterns, experimental studies should be performed to investigate the mechanical behavior, especially the compressive performance. 3 new types of sandwich masonry wall were investigated in this paper, and 3 different technical measures were considered to guarantee the cooperation between the two leaves of the walls. Based on the compression tests of 13 specimens, except for some damage patterns similar with the conventional masonry walls, several new failure patterns are found due to unique connection construction details. Comparisons were made between the tested compression capacity and the theoretical one which was calculated according to the Chinese Code for Design of Masonry Structures. The results indicate that the contributions of the 3 technical measures are different. The modification coefficient ( ) was suggested to evaluate the contribution of the technical measures on the compression capacity, and then a formula was proposed to evaluate the design compression capacity of the new sandwich masonry walls.

关键词： sandwich wall insulation wall connection compressive performance compression test

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多式联运联接共性关键技术体系构建研究

张玉召,李海军,张文豪 ,杨建铃

《中国工程科学》 2023年第25卷第6期页码 212-224 doi: 10.15302/J-SSCAE-2023.06.015

摘要：

公路、铁路、水路等货物运输方式的高效衔接是多式联运发展的核心，多式联运联接共性关键技术是实现不同货物运输方式衔接的基础，构建多式联运联接共性关键技术体系有助于推动多式联运高质量发展。本文在分析国内外多式联运发展现状的基础上，剖析了我国多式联运发展的瓶颈问题及技术突破点，提出了多式联运联接共性关键技术体系构建思路，搭建了涵盖基础网络、载运工具、数据信息、运输组织、标准规范、枢纽布局等六大模块的技术体系。结合我国实际，提出了我国多式联运技术的发展建议：做好顶层设计，为多式联运联接技术发展提供引领；加快数字化建设进程，为多式联运联接打牢技术底座；推进标准体系建设，为多式联运联接技术发展破除尺度壁垒；制定联运设施衔接的支持政策，为多式联运联接技术发展提供资金保障；加强协调机制建设，为多式联运联接打通管理屏障。

关键词：多式联运联接；基础网络；数据信息；标准规范；枢纽布局

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间歇性连接故障影响下的控制器局域网可用性评估 Research Article

王珑凯1,张雷鸣2,雷勇1

《信息与电子工程前沿（英文）》 2024年第25卷第4期页码 555-568 doi: 10.1631/FITEE.2200592

摘要：控制器局域网（CAN）作为工业中广泛使用的现场总线之一，已经扩展到对安全性和可靠性有严格要求的自动化领域。在实际应用中，电缆的疲劳和绝缘磨损等因素会导致CAN总线中间歇性连接（IC）故障频繁发生，从而影响系统的动态行为和安全。因此，定量评估CAN在IC故障影响下的性能对系统的实时健康监测至关重要。本文提出一种考虑IC故障的CAN可用性实时定量评估方法，该方法基于网络状态转移模型计算系统可用性参数。首先，构建IC故障与网络错误响应之间的因果关系，在此基础上估计IC故障到达速率。其次，对考虑IC故障的网络状态进行分析，采用确定与随机Petri网（DSPN）模型描述状态间的转移关系。然后，根据DSPN模型中标识的概率分布和物理意义，确定DSPN模型的参数并计算系统的可用度。搭建了实验平台，并在多种实验条件下对所提方法进行实例验证。实验结果表明，所提方法的估计结果与实际值吻合良好。

关键词：控制器局域网；间歇性连接故障；到达速率；确定和随机Petri网；可用性评估

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标题作者时间类型操作

Assembly design system based on engineering connection

Wensheng YIN

期刊论文

Mouth the mirror of lungs: where does the connection lie?

null

期刊论文

Static behavior of planar intersecting CFST connection in diagrid structure

Ling LI, Xianzhong ZHAO, Ke KE

期刊论文