检索范围:
排序: 展示方式:
《结构与土木工程前沿(英文)》 页码 1033-1046 doi: 10.1007/s11709-023-0973-y
关键词: shield tunnel bearing capacity failure mechanism segment reinforcement
Manufacturing technique and performance of functionally graded concrete segment in shield tunnel
Baoguo MA, Dinghua ZOU, Li XU
《结构与土木工程前沿(英文)》 2009年 第3卷 第1期 页码 101-104 doi: 10.1007/s11709-009-0011-8
关键词: shield tunnel functionally graded concrete segment (FGCS) manufacturing technology performance
Wanghui BU, Zhenyu LIU, Jianrong TAN, Jin CHENG
《机械工程前沿(英文)》 2011年 第6卷 第4期 页码 463-467 doi: 10.1007/s11465-011-0225-z
The shield machine is a heavy construction machine for tunnel excavation, and the segment erector is an important subsystem of the shield machine. It is difficult to achieve precise control in the 6-DOF (degree of freedom) erector in the 2-DOF 5-bar radial mechanism. Hence, this paper proposes a redundantly actuated PRPRP radial mechanism for the segment erector. When the redundant actuator is unlocked, the radial mechanism is able to adjust its posture, which has two degrees of freedom. On the other hand, when the redundant actuator is locked or produces enough pre-tightening tensile force, the PRPRP mechanism can ensure the synchronization of the two driving hydraulic cylinders along the radial direction based on the mechanical structure, which has one degree of freedom. The redundant actuator also facilitates the equal application of two flexural torques at the hydraulic cylinders; thus, preventing the overload of a single cylinder.
关键词: redundant actuation parallel mechanisms five-bar mechanisms segment erectors shield machines
Hu SHI, Guofang GONG, Huayong YANG
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 369-376 doi: 10.1007/s11465-011-0223-1
Focusing on a segment erector of a shield-tunneling machine developed with 6 degrees of freedom (DOF) and controlled by electro-hydraulic proportional systems, the kinematics of the segment erection process is presented. The perturbation method in the error analysis is introduced to establish the position and attitude error model, considering a number of factors such as the hydraulic drive, control accuracy, and tolerance in manufacturing and assembly. Dynamic simulations are carried out to obtain the controlling precision of electrohydraulic drive systems. Formulas for calculating the position and attitude error of the grip hand of the segment erector are derived. The calculation results verify the practicality and effectiveness of the error analysis, providing a foundation for practical designing, manufacturing, and assembling of the segment of the erecting mechanism.
关键词: shield tunneling machine segment erector kinematics position and attitude precision
Shaochun WANG, Xi JIANG, Yun BAI
《结构与土木工程前沿(英文)》 2019年 第13卷 第5期 页码 1200-1213 doi: 10.1007/s11709-019-0546-2
关键词: shield tunneling structural synthetic fiber concrete hand hole segment joint ultimate bearing capacity crack pattern
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0673-7
关键词: deep reinforcement learning hyper parameter optimization convolutional neural network fault diagnosis
Calculation of prestressed anchor segment by 3D infinite element
Yanfen WANG, Hongyang XIE, Yuanhan WANG
《结构与土木工程前沿(英文)》 2009年 第3卷 第1期 页码 63-66 doi: 10.1007/s11709-009-0006-5
关键词: infinite element prestressed anchor couple finite element
谭忠盛,洪开荣,万姜林,王梦恕
《中国工程科学》 2006年 第8卷 第12期 页码 92-96
广州地铁二号线越—三盾构区间的地层软硬不均,加之曲线多、坡度变化大,盾构掘进技术难度大,掘进方向与盾构姿态的控制困难,防止管片开裂和局部破损以及错台具有一定的难度。为了有效地控制掘进方向和盾构姿态,研究了盾构掘进方向发生偏差的原因,并对越—三区间盾构掘进的偏差实测数据进行具体分析,得出了偏差的原因和规律;研究了盾构掘进姿态的控制方法。为了防止盾构管片的裂损,采用数值模拟方法研究管片裂损的规律及其主要因素,提出了有效控制管片裂损的主要方法。
Sensory innervation of the anterior eye segment in rats: a retrograde tracing study
Haixia LIU MD , Zhiwang LI MD , Min YANG MD , Xiang TIAN MS , Chaoying LI PhD , Lei PEI PhD ,
《医学前沿(英文)》 2009年 第3卷 第3期 页码 352-356 doi: 10.1007/s11684-009-0065-y
Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal
Luisa PANI, Flavio STOCHINO
《结构与土木工程前沿(英文)》 2020年 第14卷 第5期 页码 1196-1214 doi: 10.1007/s11709-020-0662-z
关键词: punching shear strength reinforced concrete slabs reinforcement ratio
Spatial embedded reinforcement of 20-node block element for analysis PC bridges
LONG Peiheng, DU Xianting, CHEN Weizhen
《结构与土木工程前沿(英文)》 2008年 第2卷 第3期 页码 274-280 doi: 10.1007/s11709-008-0039-1
关键词: arithmetic analysis calculation prestressed reinforcement mechanical arbitrary
Jian Wu,Yang Yan,Yulong Liu,Yahui Liu,
《工程(英文)》 doi: 10.1016/j.eng.2023.07.018
关键词: Obstacle avoidance trajectory planning Inverse reinforcement theory Anthropomorphic Adaptive driving scenarios
程学武,许维青,杨志永
《中国工程科学》 2010年 第12卷 第12期 页码 89-93
总结了北京地下直径线工程大直径盾构管片拼装技术,初步分析了大直径盾构钢筋混凝土管片施工过程中的表观破损原因,并对破损管片修补技术进行探讨,提出对拱腰以上、拱腰以下部位管片的不同修补方法,保证了大直径盾构管片的强度及外观质量。
Automated synthesis of steady-state continuous processes using reinforcement learning
《化学科学与工程前沿(英文)》 2022年 第16卷 第2期 页码 288-302 doi: 10.1007/s11705-021-2055-9
关键词: automated process synthesis flowsheet synthesis artificial intelligence machine learning reinforcement learning
Shaojun ZHU; Makoto OHSAKI; Kazuki HAYASHI; Shaohan ZONG; Xiaonong GUO
《结构与土木工程前沿(英文)》 2022年 第16卷 第11期 页码 1397-1414 doi: 10.1007/s11709-022-0860-y
关键词: progressive collapse alternate load path demolition planning reinforcement learning graph embedding
标题 作者 时间 类型 操作
Bending failure performance of a shield tunnel segment based on full-scale test and numerical analysis
期刊论文
Manufacturing technique and performance of functionally graded concrete segment in shield tunnel
Baoguo MA, Dinghua ZOU, Li XU
期刊论文
A redundantly actuated PRPRP radial mechanism in the segment erector of a shield machine for synchronization
Wanghui BU, Zhenyu LIU, Jianrong TAN, Jin CHENG
期刊论文
Drive system design and error analysis of the 6 degrees of freedom segment erector of shield tunneling
Hu SHI, Guofang GONG, Huayong YANG
期刊论文
The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints
Shaochun WANG, Xi JIANG, Yun BAI
期刊论文
A new automatic convolutional neural network based on deep reinforcement learning for fault diagnosis
期刊论文
Calculation of prestressed anchor segment by 3D infinite element
Yanfen WANG, Hongyang XIE, Yuanhan WANG
期刊论文
Sensory innervation of the anterior eye segment in rats: a retrograde tracing study
Haixia LIU MD , Zhiwang LI MD , Min YANG MD , Xiang TIAN MS , Chaoying LI PhD , Lei PEI PhD ,
期刊论文
Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal
Luisa PANI, Flavio STOCHINO
期刊论文
Spatial embedded reinforcement of 20-node block element for analysis PC bridges
LONG Peiheng, DU Xianting, CHEN Weizhen
期刊论文
Anthropomorphic Obstacle Avoidance Trajectory Planning for Adaptive Driving Scenarios Based on Inverse Reinforcement
Jian Wu,Yang Yan,Yulong Liu,Yahui Liu,
期刊论文