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Analysis of the dynamic hysteresis characteristic of finger seal
LEI Yanni, CHEN Guoding
《机械工程前沿(英文)》 2007年 第2卷 第1期 页码 32-36 doi: 10.1007/s11465-007-0005-y
关键词: FS necessary hysteresis characteristic optimization spring
Cyclic stress-strain behavior of structural steel with yield-strength up to 460 N/mm
Yiyi CHEN,Wei SUN,Tak-Ming CHAN
《结构与土木工程前沿(英文)》 2014年 第8卷 第2期 页码 178-186 doi: 10.1007/s11709-014-0245-y
关键词: constitutive model finite element analysis hysteresis curve Ramberg-Osgood equation
Fei LI,Suocheng DONG,Fujia LI,Libiao YANG
《环境科学与工程前沿(英文)》 2016年 第10卷 第2期 页码 276-287 doi: 10.1007/s11783-014-0700-y
Learning curve of totally thoracoscopic pulmonary segmentectomy
Weibing Wu, Jing Xu, Wei Wen, Yue Yu, Xinfeng Xu, Quan Zhu, Liang Chen
《医学前沿(英文)》 2018年 第12卷 第5期 页码 586-592 doi: 10.1007/s11684-017-0566-z
Totally thoracoscopic pulmonary segmentectomy (TTPS) is a feasible and safe technique that requires advanced thoracoscopic skills and knowledge of pulmonary anatomy. However, data describing the learning curve of TTPS have yet to be obtained. In this study, 128 patients who underwent TTPS between September 2010 and December 2013 were retrospectively analyzed to evaluate the learning curve and were divided chronologically into three phases, namely, ascending phase (A), plateau phase (B), and descending phase (C), through cumulative summation (CUSUM) for operative time (OT). Phases A, B, and C comprised 39, 33, and 56 cases, respectively. OT and blood loss decreased significantly from phases A to C (P <0.01), and the frequency of intraoperative bronchoscopy for target bronchus identification decreased gradually (A, 8/39; B, 4/33; C, 3/56; P = 0.06). No significant differences were observed in demographic factors, conversion, complications, hospital stay, and retrieved lymph nodes among the three phases. Surgical outcomes and techniques improved with experience and volume. CUSUMOT indicated that the learning curve of TTPS should be more than 72 cases.
Numerical investigation of circle defining curve for two-dimensional problem with general boundaries
Chung Nguyen VAN
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 92-102 doi: 10.1007/s11709-018-0472-8
关键词: exact geometry circular defining curve general boundaries SBFEM
Research on applications of piezoelectric materials in smart structures
Jinhao QIU, Hongli JI
《机械工程前沿(英文)》 2011年 第6卷 第1期 页码 99-117 doi: 10.1007/s11465-011-0212-4
Piezoelectric materials have become the most attractive functional materials for sensors and actuators in smart structures because they can directly convert mechanical energy to electrical energy and vise versa. They have excellent electromechanical coupling characteristics and excellent frequency response. In this article, some research activities on the applications of piezoelectric materials in smart structures, including semi-active vibration control based on synchronized switch damping using negative capacitance, energy harvesting using new electronic interfaces, structural health monitoring based on a new type of piezoelectric fibers with metal core, and active hysteresis control based on new modified Prandtl-Ishlinskii model at the Aeronautical Science Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics are introduced.
关键词: piezoelectric materials vibration control energy harvesting structural health monitoring piezoelectric hysteresis
Dynamic characteristics of a magnetorheological pin joint for civil structures
Yancheng LI,Jianchun LI
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 15-33 doi: 10.1007/s11465-014-0283-0
Magnetorheological (MR) pin joint is a novel device in which its joint moment resistance can be controlled in real-time by altering the applied magnetic field. The smart pin joint is intended to be used as a controllable connector between the columns and beams of a civil structure to instantaneously shift the structural natural frequencies in order to avoid resonance and therefore to reduce unwanted vibrations and hence prevent structural damage. As an intrinsically nonlinear device, modelling of this MR fluid based device is a challenging task and makes the design of a suitable control algorithm a cumbersome situation. Aimed at its application in civil structure, the main purpose of this paper is to test and characterise the hysteretic behaviour of MR pin joint. A test scheme is designed to obtain the dynamic performance of MR pin joint in the dominant earthquake frequency range. Some unique phenomena different from those of MR damper are observed through the experimental testing. A computationally-efficient model is proposed by introducing a hyperbolic element to accurately reproduce its dynamic behaviour and to further facilitate the design of a suitable control algorithm. Comprehensive investigations on the model accuracy and dependences of the proposed model on loading condition (frequency and amplitude) and input current level are reported in the last section of this paper.
关键词: Magnetorheological pin joint hyperbolic hysteresis model experimental testing frequency dependence
陈志祥
《中国工程科学》 2007年 第9卷 第7期 页码 82-88
学习曲线是一种通过生产者行为学习与经验积累而得到改进的生产产出的特征函数,利用学习曲线可以科学地制定成本计划,改善作业计划、劳动定额与劳力规划,质量改善等。对国际上的研究文献、学习曲线的表现形式及其特点进行分析,探讨了几个新的应用动向。
Research on physical shape preserving curve reconstruction
TANG Kelun, ZHANG Xiangwei, CHENG Siyuan, XIONG Hanwei, ZHANG Hong
《机械工程前沿(英文)》 2007年 第2卷 第3期 页码 305-309 doi: 10.1007/s11465-007-0054-2
关键词: information CMM Numerical simulation effective coordinate measuring
Interpolation of a spline developable surface between a curve and two rulings
Alicia CANTÓN,Leonardo FERNÁNDEZ-JAMBRINA
《信息与电子工程前沿(英文)》 2015年 第16卷 第3期 页码 173-190 doi: 10.1631/FITEE.14a0210
Principle and curve of planetary indexing cam mechanisms
LIU Ming-tao, ZHANG Ce, YANG Yu-hu
《机械工程前沿(英文)》 2006年 第1卷 第4期 页码 475-478 doi: 10.1007/s11465-006-0063-6
关键词: continuity planetary average transmission symmetry intermittent
S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG
《结构与土木工程前沿(英文)》 2019年 第13卷 第3期 页码 542-556 doi: 10.1007/s11709-018-0496-0
关键词: piezoelectricity impedance curve mode shapes inverse problem flaw detection curve shifting
Electromagnetic modeling and control of switched reluctance motor using finite elements
Ali ARIF,Abderrazak GUETTAF,Ahmed Chaouki MEGHERBI,Said BENRAMACHE,Fateh BENC HABANE
《能源前沿(英文)》 2014年 第8卷 第3期 页码 355-363 doi: 10.1007/s11708-014-0319-5
关键词: switched reluctance motor (SRM) hysteresis control finite element analysis
《结构与土木工程前沿(英文)》 页码 1145-1162 doi: 10.1007/s11709-023-0945-2
关键词: seismic resilience self-centering rubber layer flag-shaped hysteresis loop parametric study
标题 作者 时间 类型 操作
Cyclic stress-strain behavior of structural steel with yield-strength up to 460 N/mm
Yiyi CHEN,Wei SUN,Tak-Ming CHAN
期刊论文
Is there an inverted U-shaped curve?Empirical analysis of the Environmental Kuznets Curve in agrochemicals
Fei LI,Suocheng DONG,Fujia LI,Libiao YANG
期刊论文
Learning curve of totally thoracoscopic pulmonary segmentectomy
Weibing Wu, Jing Xu, Wei Wen, Yue Yu, Xinfeng Xu, Quan Zhu, Liang Chen
期刊论文
Numerical investigation of circle defining curve for two-dimensional problem with general boundaries
Chung Nguyen VAN
期刊论文
Dynamic characteristics of a magnetorheological pin joint for civil structures
Yancheng LI,Jianchun LI
期刊论文
Research on physical shape preserving curve reconstruction
TANG Kelun, ZHANG Xiangwei, CHENG Siyuan, XIONG Hanwei, ZHANG Hong
期刊论文
Interpolation of a spline developable surface between a curve and two rulings
Alicia CANTÓN,Leonardo FERNÁNDEZ-JAMBRINA
期刊论文
Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements
S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG
期刊论文
Electromagnetic modeling and control of switched reluctance motor using finite elements
Ali ARIF,Abderrazak GUETTAF,Ahmed Chaouki MEGHERBI,Said BENRAMACHE,Fateh BENC HABANE
期刊论文