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An adaptive sliding mode control technology for weld seam tracking
Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 95-101 doi: 10.1007/s11465-015-0332-3
A novel adaptive sliding mode control algorithm is derived to deal with seam tracking control problem of welding robotic manipulator, during the process of large-scale structure component welding. The proposed algorithm does not require the precise dynamic model, and is more practical. Its robustness is verified by the Lyapunov stability theory. The analytical results show that the proposed algorithm enables better high-precision tracking performance with chattering-free than traditional sliding mode control algorithm under various disturbances.
关键词: weld seam tracking welding robotic manipulator adaptive control sliding mode control
HUANG Yong, FAN Ding, FAN Qinghua
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 442-447 doi: 10.1007/s11465-007-0076-9
Local fracture properties and dissimilar weld integrity in nuclear power plants
Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 283-290 doi: 10.1007/s11465-013-0250-1
In this paper, the local fracture properties in a Alloy52M dissimilar metal welded joint (DMWJ) between A508 ferritic steel and 316 L stainless steel in nuclear power plants were investigated by using the single-edge notched bend (SENB) specimens, and their use in integrity assessment of DMWJ structures was analyzed. The results show that the local fracture resistance in the DMWJ is determined by local fracture mechanism, and which is mainly related to the microstructures and local strength mismatches of materials at the crack locations. The initial cracks always grow towards the materials with lower strength, and the crack path deviation is mainly controlled by the local strength mismatch. If the local fracture properties could not be used for cracks in the heat affected zones (HAZs), interface and near interface zones, the use of the fracture properties ( -resistance curves) of base metals or weld metals following present codes will unavoidably produce non-conservative (unsafe) or excessive conservative assessment results. In most cases, the assessment results will be potentially unsafe. Therefore, it is recommended to obtain and use local mechanical and fracture properties in the integrity assessment of DMWJs.
关键词: local fracture properties dissimilar metal welded joint integrity assessment strength mismatch crack growth path
Parametric equations for notch stress concentration factors of rib–deck welds under bending loading
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 595-608 doi: 10.1007/s11709-021-0720-1
关键词: notch stress concentration factor rib–deck weld parametric analysis regression analysis parametric equation
Characteristics of metal magnetic memory signals of different steels under static tension
Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,
《机械工程前沿(英文)》 2010年 第5卷 第2期 页码 226-232 doi: 10.1007/s11465-010-0012-2
关键词: metal magnetic memory (MMM) magnetic intensity (Hp) static tension weld
Experimental investigation and design of aluminum columns with longitudinal welds
Yun WU, Qilin ZHANG
《结构与土木工程前沿(英文)》 2011年 第5卷 第3期 页码 366-373 doi: 10.1007/s11709-011-0101-2
关键词: aluminum alloy longitudinal weld heat-affected zone (HAZ) reduced strength zone (RSZ) buckling column experimental study
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
Experimental study on slender buckling-restrained knee braces with round steel bar cores
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 99-121 doi: 10.1007/s11709-022-0875-4
关键词: weld-free beam-to-column connections moment-resisting frame cyclic and compression loading tests buckling-restrained knee brace cover tube
Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 563-570 doi: 10.1007/s11465-018-0487-9
The thermal hydraulic (TH) behavior of coo-lant water is a key factor in the structural integrity assessments on reactor pressure vessels (RPVs) of pressurized water reactors (PWRs) under pressurized thermal shock (PTS) events, because the TH behavior may affect the loading conditions in the assessment. From the viewpoint of TH behavior, configuration of plant equipment and their dimensions, and operator action time considerably influence various parameters, such as the temperature and flow rate of coolant water and inner pressure. In this study, to investigate the influence of the operator action time on TH behavior during a PTS event, we developed an analysis model for a typical Japanese PWR plant, including the RPV and the main components of both primary and secondary systems, and performed TH analyses by using a system analysis code called RELAP5. We applied two different operator action times based on the Japanese and the United States (US) rules: Operators may act after 10 min (Japanese rules) and 30 min (the US rules) after the occurrence of PTS events. Based on the results of TH analysis with different operator action times, we also performed structural analyses for evaluating thermal-stress distributions in the RPV during PTS events as loading conditions in the structural integrity assessment. From the analysis results, it was clarified that differences in operator action times significantly affect TH behavior and loading conditions, as the Japanese rule may lead to lower stresses than that under the US rule because an earlier operator action caused lower pressure in the RPV.
关键词: structural integrity reactor pressure vessel pressurized thermal shock thermal hydraulic analysis pressurized water reactor weld residual stress
标题 作者 时间 类型 操作
An adaptive sliding mode control technology for weld seam tracking
Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE
期刊论文
Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloy
HUANG Yong, FAN Ding, FAN Qinghua
期刊论文
Local fracture properties and dissimilar weld integrity in nuclear power plants
Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU
期刊论文
Parametric equations for notch stress concentration factors of rib–deck welds under bending loading
期刊论文
Characteristics of metal magnetic memory signals of different steels under static tension
Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,
期刊论文
Experimental investigation and design of aluminum columns with longitudinal welds
Yun WU, Qilin ZHANG
期刊论文
Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures
Hyungjoo CHOI, Husam NAJM
期刊论文