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斜拉桥 9

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Influence of damages on static behavior of single-layer cable net supported glass curtain wall: full-scale

Gang SHI, Yongjiu SHI, Yuanqing WANG, Yongzhi ZUO, Xiaohao SHI, Zaoyang GUO,

《结构与土木工程前沿（英文）》 2010年第4卷第3期页码 383-395 doi: 10.1007/s11709-010-0074-6

摘要： The single-layer cable net supported glass curtain wall has been applied in many building structures all over the world. In service, it will inevitably be subject to various damages. To study the influence of such damages on the static behavior of the single-layer cable net supported glass curtain wall, a full-scale model with the outside outline size of 4.85 m × 4.85 m and 4 × 4 grids is designed and tested. Two kinds of damages that are the cable prestress loss and cable anchorage end failure are led into the structure model during the test, and their influence has been investigated. The stiffness contribution of glass panels to the single-layer cable net supported glass curtain wall structure with or without damages and its change have been tested and analyzed. The results show that the maximum change rate of nodal deflection is 13.78% for the damage of cable prestress loss, while the change rate of nodal deflection is between 7% and 22% for the damage of cable anchorage end failure. The influence degree of the damages depends on the ratio of the structure initial stress stiffness change caused by damages to the total stiffness of the structure. The stiffness contribution of glass panels increases with the load increase. Under the same loading condition, the stiffness contribution of glass panels to the damaged structure is greater than that to the intact structure. The stiffness contribution of glass panels reduces the effect of the damages on the structural displacement and the cable tension force, but the glass panel could break if its stiffness contribution is too large.

关键词： single-layer plane cable net supported glass curtain wall damage cable prestress loss cable anchorage end failure stiffness contribution of glass panels

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Dynamic performance of submerged floating tunnel with different mooring styles subjected to anchor cablefailure

《结构与土木工程前沿（英文）》 doi: 10.1007/s11709-023-0932-7

摘要： Submerged floating tunnels (SFTs) are novel structures for transportation across long- and deep-strait regions. Owing to severe wave and current excitation as well as the effects of underwater structures and corrosion, the risk of local anchor cable failure is high, which can result in the progressive failure of the entire structure. In this study, experimental and numerical investigations are conducted to analyze the dynamic behavior of an SFT with different mooring styles under local cable failure. A custom-designed cable failure device and the birth-and-death element method are used to simulate cable failure (i.e., progressive failure) via experiments and numerical simulation, respectively. A physical-scale segmental model of an SFT with different mooring styles under anchor cable failure is developed in this study. A segmental and entire-length mathematical model is developed using the ANSYS program to perform the numerical simulation. The results of the segmental numerical and experimental models indicate good agreement. The dynamic response of an SFT with different mooring styles under cable failure is comprehensively investigated by investigating the effects of key parameters (wave period, buoyant weight ratio, and cable failure mechanism). Moreover, the progressive failure of the SFT under cable failure is investigated via a segment model test and a numerical simulation of its entire length. The present study can serve as a reference for the safer designs of the SFT mooring style.

关键词： dynamic behaviors submerged floating tunnel cable failure mooring style progressive failure

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一种新型悬索桥主缆锚固系统设计概念综述

崔冰,董萌,贾立峰,宋颖彤

《中国工程科学》 2013年第15卷第8期页码 12-17

摘要：

区别于预应力锚固系统，在传统钢框架后锚梁锚固系统的基础上，南京长江第四大桥采用一种新型悬索桥主缆锚固系统——分布传力式锚固系统。钢框架后锚梁锚固系统依靠后锚梁刚性承载，应力集中明显，有一定的结构和安全风险。分布传力式锚固系统锚固区域通过布置多排钢筋混凝土榫剪力键（PBL），变刚性承压承载为柔性承载，索力渐次传递至锚体混凝土；变集中承载为分布传力式承载，扩大了传力区域，减小应力集中，降低结构风险；利用PBL良好的延性，同时通过设置末端承压板，为结构整体提供足够的安全储备。本文对这种新型锚固系统的设计作了简要介绍。

关键词：主缆锚固系统分布传力式南京长江第四大桥

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两座大型斜拉桥索塔锚固区模型试验及对比研究

刘钊,孟少平,吕志涛

《中国工程科学》 2003年第5卷第12期页码 48-54

摘要：

简要介绍了两座大型斜拉桥（南京长江第二大桥南汊桥和润扬长江公路大桥北汊桥）索塔锚固区的节段足尺模型试验，研究了索塔锚固区的抗裂安全系数和极限承载力；同时，还对索塔锚固区预应力索的合理布置形式、索塔节段模型对索塔整体的仿真效果等进行了研究，对于斜拉桥索塔设计具有理论指导意义和实用价值。

关键词：斜拉桥索塔模型试验设计研究

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Topology-independent end-to-end learning model for improving the voltage profile in microgrids-integrated

《能源前沿（英文）》 2023年第17卷第2期页码 211-227 doi: 10.1007/s11708-022-0847-3

摘要： With multiple microgrids (MGs) integrated into power distribution networks in a distributed manner, the penetration of renewable energy like photovoltaic (PV) power generation surges. However, the operation of power distribution networks is challenged by the issues of multiple power flow directions and voltage security. Accordingly, an efficient voltage control strategy is needed to ensure voltage security against ever-changing operating conditions, especially when the network topology information is absent or inaccurate. In this paper, we propose a novel data-driven voltage profile improvement model, denoted as system-wide composite adaptive network (SCAN), which depends on operational data instead of network topology details in the context of power distribution networks integrated with multiple MGs. Unlike existing studies that realize topology identification and decision-making optimization in sequence, the proposed end-to-end model determines the optimal voltage control decisions in one shot. More specifically, the proposed model consists of four modules, Pre-training Network and modified interior point methods with adversarial networks (Modified IPMAN) as core modules, and discriminator generative adversarial network (Dis-GAN) and Volt convolutional neural network (Volt-CNN) as ancillary modules. In particular, the generator in SCAN is trained by the core modules in sequence so as to form an end-to-end mode from data to decision. Numerical experiments based on IEEE 33-bus and 123-bus systems have validated the effectiveness and efficiency of the proposed method.

关键词： end-to-end learning microgrids voltage profile improvement generative adversarial network

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泰州大桥南锚碇沉井基础深度效应研究

潘辉,邵国建,胡丰

《中国工程科学》 2012年第14卷第5期页码 62-65

摘要：

重力式锚碇基础在计算中通常简化为浅基础，并不考虑深度效应的影响，较为不经济。泰州大桥南锚碇沉井埋置深度达42 m，为将深度效应考虑到锚碇稳定性计算中，故采用有限元法对泰州大桥南锚碇沉井基础的深度效应进行研究。通过计算对比不同埋置深度条件下锚碇基础在施工期及运营期内位移和转角的变化，可知深度效应对锚碇基础承载力的增强作用十分明显。

关键词：重力式锚碇沉井基础深度效应有限元

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Finite element modeling of cable sliding and its effect on dynamic response of cable-supported truss

Yujie YU, Zhihua CHEN, Renzhang YAN

《结构与土木工程前沿（英文）》 2019年第13卷第5期页码 1227-1242 doi: 10.1007/s11709-019-0551-5

摘要： The cable system of cable-supported structures usually bears high tension forces, and clip joints may fail to resist cable sliding in cases of earthquake excitations or sudden cable breaks. A analytical method that considers the dynamic cable sliding effect is proposed in this paper. Cable sliding behaviors and the resultant dynamic responses are solved by combining the vector form intrinsic finite element framework with cable force redistribution calculations that consider joint frictions. The cable sliding effect and the frictional tension loss are solved with the original length method that uses cable length and the original length relations. Then, the balanced tension distributions are calculated after frictional sliding. The proposed analytical method is achieved within MATLAB and applied to simulate the dynamic response of a cable-supported plane truss under seismic excitation and sudden cable break. During seismic excitations, the cable sliding behavior in the cable-supported truss have an averaging effect on the oscillation magnitudes, but it also magnifies the internal force response in the upper truss structure. The slidable cable joints can greatly reduce the ability of a cable system to resist sudden cable breaks, while strong friction resistances at the cable-strut joints can help retain internal forces.

关键词： sliding cable explicit solution framework original length method seismic response cable rupture

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Integrated management of cardiac failure: the cardiac failure clinic

null

《医学前沿（英文）》 2011年第5卷第1期页码 20-25 doi: 10.1007/s11684-011-0106-1

摘要：

The prevalence of the risk factors and the risk of cardiac failure are both increasing in China. This might be the consequence of the changes of the life conditions (emigration to the urban areas, changes in the diet and life style, lack of physical exercise, etc.). The wide range of clinical presentations of cardiac failure (acute or chronic) and of therapeutic approaches (medical or surgical) makes necessary the integration within the same structure of the various experts involved in the diagnosis and the treatment of cardiac diseases. Technologic and human resources required to offer all the options represent a multifaceted commitment which should be focused optimally in dedicated centers. In these centers, collaboration should replace competition between the medical and the surgical cardiac specialists. Development of team work should permit to optimize the cost efficacy of the treatments. Most of all, such a structure will facilitate the translation of innovative therapies between the research centers and clinical facilities.

关键词： cardiac failure cardiac transplantation mechanical circulatory support

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Analytical dynamic solution of a flexible cable-suspended manipulator

Mahdi BAMDAD

《机械工程前沿（英文）》 2013年第8卷第4期页码 350-359 doi: 10.1007/s11465-013-0271-9

摘要：

Cable-suspended manipulators are used in large scale applications with, heavy in weight and long in span cables. It seems impractical to maintain cable assumptions of smaller robots for large scale manipulators. The interactions among the cables, platforms and actuators can fully evaluate the coupled dynamic analysis. The structural flexibility of the cables becomes more pronounced in large manipulators. In this paper, an analytic solution is provided to solve cable vibration. Also, a closed form solution can be adopted to improve the dynamic response to flexibility. The output is provided by the optimal torque generation subject to the actuator limitations in a mechatronic sense. Finally, the performance of the proposed algorithm is examined through simulations.

关键词： parallel robot flexible cable suspended robot dynamic

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一种端到端语音合成中的高效解码自注意力网络 Research Article

赵伟1,2,许力1,2

《信息与电子工程前沿（英文）》 2022年第23卷第7期页码 1127-1138 doi: 10.1631/FITEE.2100501

摘要：自注意力网络由于其并行结构和强大的序列建模能力，被广泛应用于语音合成（TTS）领域。然而，当使用自回归解码方法进行端到端语音合成时，由于序列长度的二次复杂性，其推理速度相对较慢。当部署设备未配备图形处理器（GPU）时，该效率问题更加严重。为解决该问题，提出一种高效解码自注意力网络（EDSA）作为替代。通过一个动态规划解码过程，有效加速TTS模型推理，使其具有线性计算复杂度。基于普通话和英文数据集的实验结果表明，所提EDSA模型在中央处理器（CPU）和GPU上的推理速度分别提高720%和50%，而性能几乎相同。因此，在GPU资源有限的情况下，该方法可使此类模型的部署更加容易。此外，所提模型在域外语言处理上可能比基线Transformer TTS性能更好。

关键词：高效解码；端到端；自注意力网络；语音合成

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Progressive failure analysis of notched composite plate by utilizing macro mechanics approach

《结构与土木工程前沿（英文）》 2021年第15卷第3期页码 623-642 doi: 10.1007/s11709-021-0726-8

摘要： In this study, gradual and sudden reduction methods were combined to simulate a progressive failure in notched composite plates using a macro mechanics approach. Using the presented method, a progressive failure is simulated based on a linear softening law prior to a catastrophic failure, and thereafter, sudden reduction methods are employed for modeling a progressive failure. This combination method significantly reduces the computational cost and is also capable of simultaneously predicting the first and last ply failures (LPFs) in composite plates. The proposed method is intended to predict the first ply failure (FPF), LPF, and dominant failure modes of carbon/epoxy and glass/epoxy notched composite plates. In addition, the effects of mechanical properties and different stacking sequences on the propagation of damage in notched composite plates were studied. The results of the presented method were compared with experimental data previously reported in the literature. By comparing the numerical and experimental data, it is revealed that the proposed method can accurately simulate the failure propagation in notched composite plates at a low computational cost.

关键词： progressive failure notched composite plate Hashin failure criterion macro mechanics approach finite element method

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State-of-the-art on theories and applications of cable-driven parallel robots

《机械工程前沿（英文）》 2022年第17卷第3期 doi: 10.1007/s11465-022-0693-3

摘要： Cable-driven parallel robot (CDPR) is a type of high-performance robot that integrates cable-driven kinematic chains and parallel mechanism theory. It inherits the high dynamics and heavy load capacities of the parallel mechanism and significantly improves the workspace, cost and energy efficiency simultaneously. As a result, CDPRs have had irreplaceable roles in industrial and technological fields, such as astronomy, aerospace, logistics, simulators, and rehabilitation. CDPRs follow the cutting-edge trend of rigid–flexible fusion, reflect advanced lightweight design concepts, and have become a frontier topic in robotics research. This paper summarizes the kernel theories and developments of CDPRs, covering configuration design, cable-force distribution, workspace and stiffness, performance evaluation, optimization, and motion control. Kinematic modeling, workspace analysis, and cable-force solution are illustrated. Stiffness and dynamic modeling methods are discussed. To further promote the development, researchers should strengthen the investigation in configuration innovation, rapid calculation of workspace, performance evaluation, stiffness control, and rigid–flexible coupling dynamics. In addition, engineering problems such as cable materials, reliability design, and a unified control framework require attention.

关键词： cable-driven parallel robot kinematics optimization dynamics control

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Development of a masticatory robot using a novel cable-driven linear actuator with bidirectional motion

《机械工程前沿（英文）》 2022年第17卷第4期 doi: 10.1007/s11465-022-0687-1

摘要： Masticatory robots are an effective in vitro performance testing device for dental material and mandibular prostheses. A cable-driven linear actuator (CDLA) capable of bidirectional motion is proposed in this study to design a masticatory robot that can achieve increasingly human-like chewing motion. The CDLA presents remarkable advantages, such as lightweight and high stiffness structure, in using cable amplification and pulley systems. This work also exploits the proposed CDLA and designs a masticatory robot called Southeast University masticatory robot (SMAR) to solve existing problems, such as bulky driving linkage and position change of the muscle’s origin. Stiffness analysis and performance experiment validate the CDLA’s efficiency, with its stiffness reaching 1379.6 N/mm (number of cable parts n = 4), which is 21.4 times the input wire stiffness. Accordingly, the CDLA’s force transmission efficiencies in two directions are 84.5% and 85.9%. Chewing experiments are carried out on the developed masticatory robot to verify whether the CDLA can help SMAR achieve a natural human-like chewing motion and sufficient chewing forces for potential applications in performance tests of dental materials or prostheses.

关键词： masticatory robot cable-driven linear actuator parallel robot stiffness analysis

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预应力梁桥齿板锚固区配筋设计新方法

张向群,林波,刘钊

《中国工程科学》 2010年第12卷第4期页码 82-85

摘要：

预应力混凝土梁桥的齿板锚固区，由于存在着几何形体上的突变，集中锚固力的作用以及预应力钢束局部弯曲引起的径向力作用，易产生开裂甚至剥落破坏，因此齿板锚固区的抗裂配筋设计十分重要。以7种典型局部作用效应刻画齿板锚固区内拉应力的集中分布特征，并在此基础上形成了齿板锚固区拉压杆模型，初步形成预应力混凝土梁桥的抗裂钢筋设计新方法。

关键词：齿板锚固区 D区拉压杆模型

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Comparison on End-of-Life strategies of WEEE in China based on LCA

Bin Lu, Xiaolong Song, Jianxin Yang, Dong Yang

《环境科学与工程前沿（英文）》 2017年第11卷第5期 doi: 10.1007/s11783-017-0994-7

摘要： As the Electrical and Electronic Equipment (EEE) are upgraded more frequently in China, a large quantity of Waste Electrical and Electronic Equipment (WEEE) was and will be generated. It becomes an urgent issue to develop and adopt an effective End-of-Life (EoL) strategy for EEE in order to balance the resource recovery and environmental impacts. In an EoL strategy hierarchy for EEE, reuse strategy is usually deemed to be prior to materials recovery and other strategies. But in practice, the advantages and disadvantages of different strategies are always context-dependent. Therefore, main EoL strategies for EEE in China need to be evaluated in environment and resources aspects from the life cycle perspective. In this study, the obsolete refrigerator and Power Supply Unit (PSU) of desktop PC are both taken as the target products. Life Cycle Assessment (LCA) is applied to assess the environmental impacts of different EoL scenarios in China: Unit Reuse Scenario (URS), Component Reuse Scenario (CRS) and Materials Recovery Scenario (MRS). The LCA results show that the EoL strategies hierarchy is reasonable for the part of computer, but not necessarily suitable for obsolete refrigerators. When the policy makers promote or demote one EoL strategy especially reuse, it is necessary to take subsequent impacts into consideration.

关键词： End-of-Life Waste electrical and electronic equipment Life cycle assessment Reuse