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Numerical analysis of aluminum alloy reticulated shells with gusset joints under fire conditions
《结构与土木工程前沿(英文)》 2023年 第17卷 第3期 页码 448-466 doi: 10.1007/s11709-022-0910-5
关键词: aluminum alloy reticulated shell gusset joint numerical analysis fire resistance
《结构与土木工程前沿(英文)》 页码 901-914 doi: 10.1007/s11709-023-0915-8
关键词: shield tunnel segment joint joint structural model failure mechanism
Yunlin LIU, Shitao ZHU
《结构与土木工程前沿(英文)》 2019年 第13卷 第5期 页码 1095-1104 doi: 10.1007/s11709-019-0538-2
关键词: PCS concrete side joint numerical simulation fiber-beam element joint model solid element joint model seismic behavior
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
基于人体髋关节转动中心分析的髋关节外骨骼仿生设计 Article
Wei YANG,Can-jun YANG,Ting XU
《信息与电子工程前沿(英文)》 2016年 第17卷 第8期 页码 792-802 doi: 10.1631/FITEE.1500286
Identification of dynamic stiffness matrix of bearing joint region
Feng HU, Bo WU, Youmin HU, Tielin SHI
《机械工程前沿(英文)》 2009年 第4卷 第3期 页码 289-299 doi: 10.1007/s11465-009-0064-3
关键词: frequency response function (FRFs) dynamic stiffness finite element synthetic substructure method joint region
Saleh YAGHOOBI, Ahmad SHOOSHTARI
《结构与土木工程前沿(英文)》 2018年 第12卷 第3期 页码 341-351 doi: 10.1007/s11709-017-0393-y
Slippage corresponds to the relative displacement of a bolted joint subjected to shear loads since the construction clearance between the bolt shank and the bolthole at assembly can cause joint slip. Deflections of towers with joint slippage effects is up to 1.9 times greater than the displacements obtained by linear analytical methods. In this study, 8 different types of joints are modelled and studied in the finite element program, and the results are verified by the experimental results which have been done in the laboratory. Moreover, several types of joints have been modelled and studied and load-deformation curves have also been presented. Finally, joint slip data for different types of angles, bolt diameter and bolt arrangements are generated. Thereupon, damping ratios (z) for different types of connections are reported. The study can be useful to help in designing of wind turbine towers with a higher level of accuracy and safety.
关键词: Joint slip cyclic loading Finite element modelling Experimental joint behavior damping ratios (
General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0681-7
关键词: inverse kinematics Paden–Kahan subproblems three-joint subproblems product of exponential closed-form solution
Multi-omics joint analysis revealed the metabolic profile of retroperitoneal liposarcoma
《医学前沿(英文)》 doi: 10.1007/s11684-023-1020-z
A low cost wearable optical-based goniometer for human joint monitoring
Chee Kian LIM, Zhiqiang LUO, I-Ming CHEN, Song Huat YEO
《机械工程前沿(英文)》 2011年 第6卷 第1期 页码 13-22 doi: 10.1007/s11465-011-0201-7
Widely used in the fields of physical and occupational therapy, goniometers are indispensible when it comes to angular measurement of the human joint. In both fields, there is a need to measure the range of motion associated with various joints and muscle groups. For example, a goniometer may be used to help determine the current status of the range of motion in bend the arm at the elbow, bending the knee, or bending at the waist. The device can help to establish the range of motion at the beginning of the treatment series, and also allow the therapist to monitor progress during subsequent sessions. Most commonly found are the mechanical goniometers which are inexpensive but bulky. As the parts are mechanically linked, accuracy and resolution are largely limited. On the other hand, electronic and optical fiber-based goniometers promise better performance over its mechanical counterpart but due to higher cost and setup requirements does not make it an attractive proposition as well. In this paper, we present a reliable and non-intrusive design of an optical-based goniometer for human joint measurement. This device will allow continuous and long-term monitoring of human joint motion in everyday setting. The proposed device was benchmarked against mechanical goniometer and optical based motion capture system to validate its performance. From the empirical results, it has been proven that this design can be use as a robust and effective wearable joint monitoring device.
Yi XU, Shunze WU, Hongkuan ZANG, Guiguang HOU
《环境科学与工程前沿(英文)》 2014年 第8卷 第2期 页码 239-255 doi: 10.1007/s11783-013-0536-x
关键词: interval analysis mixed integer joint probabilistic constraint planning uncertainty waste management
Chunyan QUAN,Wei WANG,Jian ZHOU,Rong WANG
《结构与土木工程前沿(英文)》 2016年 第10卷 第3期 页码 333-344 doi: 10.1007/s11709-016-0357-7
关键词: narrow outer diaphragm concrete-filled tubular column joint inner and outer stiffening cyclic behavior
Biomechanics of knee joint – A review
Bhaskar Kumar MADETI,Srinivasa Rao CHALAMALASETTI,S K Sundara siva rao BOLLA PRAGADA
《机械工程前沿(英文)》 2015年 第10卷 第2期 页码 176-186 doi: 10.1007/s11465-014-0306-x
The present paper is to know how the work is carried out in the field of biomechanics of knee. Various model formulations are discussed and further classified into mathematical model, two-dimensional model and three-dimensional model. Knee geometry is a crucial part of human body movement, in which how various views of knee is shown in different planes and how the forces act on tibia and femur are studied. It leads to know the forces acting on the knee joint. Experimental studies of knee geometry and forces acting on knee shown by various researchers have been discussed, and comparisons of results are made. In addition, static and dynamic analysis of knee has been also discussed respectively to some extent.
关键词: biomechanics knee geometry ligaments squat femorotibial joint finite element method
Planar jumping with stable landing through foot orientation design and ankle joint control
Qilong YUAN, I-Ming CHEN
《机械工程前沿(英文)》 2012年 第7卷 第2期 页码 100-108 doi: 10.1007/s11465-012-0318-3
This paper introduces a method to generate the planar jumping motion for biped robot. In this work, through determining the upper body posture trajectory in the flight phase, the foot landing posture is made to be flat while landing. Together with properly designing the trajectory for local center of gravity and the foot landing velocity, the soft landing trajectory is generated. A controller on the ankle joint is added to avoid significant impact with the ground and stabilize the robot after landing. Jumping motion with stable landing is achieved in a dynamic simulation environment based on this method.
关键词: biped jumping stable landing control jumping motion generation
闫平
《中国工程科学》 2009年 第11卷 第1期 页码 92-96
我国城市公共交通领域已经进入了一个快速发展的建设时期,以北京城市轨道交通规划为例,分析当前我国城市轨道交通在规划、建设及运营方面存在的问题,借鉴国际大都市轨道交通在规划、建设、运营方面的轨道交通方式、客流出行换乘方便、整合既有各种资源、交通带动城市发展的经验,提出了应建立综合协调机制、完善轨道交通规划、打造综合交通枢纽的优化原则,以及利用国有铁路资源实现轨道交通换乘与衔接具体建议。
标题 作者 时间 类型 操作
Numerical analysis of aluminum alloy reticulated shells with gusset joints under fire conditions
期刊论文
Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield
期刊论文
Finite element analysis on the seismic behavior of side joint of Prefabricated Cage System in prefabricated
Yunlin LIU, Shitao ZHU
期刊论文
Dynamic characteristics of a magnetorheological pin joint for civil structures
Yancheng LI,Jianchun LI
期刊论文
Identification of dynamic stiffness matrix of bearing joint region
Feng HU, Bo WU, Youmin HU, Tielin SHI
期刊论文
Joint slip investigation based on finite element modelling verified by experimental results on wind turbine
Saleh YAGHOOBI, Ahmad SHOOSHTARI
期刊论文
General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of
期刊论文
A low cost wearable optical-based goniometer for human joint monitoring
Chee Kian LIM, Zhiqiang LUO, I-Ming CHEN, Song Huat YEO
期刊论文
An interval joint-probabilistic programming method for solid waste management: a case study for the city
Yi XU, Shunze WU, Hongkuan ZANG, Guiguang HOU
期刊论文
between concrete-filled steel tubular column and steel beam with narrow outer diaphragm and partial joint
Chunyan QUAN,Wei WANG,Jian ZHOU,Rong WANG
期刊论文
Biomechanics of knee joint – A review
Bhaskar Kumar MADETI,Srinivasa Rao CHALAMALASETTI,S K Sundara siva rao BOLLA PRAGADA
期刊论文
Planar jumping with stable landing through foot orientation design and ankle joint control
Qilong YUAN, I-Ming CHEN
期刊论文