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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
Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 675-689 doi: 10.1007/s11709-020-0625-4
关键词: composite beam dynamic finite element degrees of freedom coupling experimental validation numerical validation
Error analysis and optimization of a 3-degree of freedom translational Parallel Kinematic Machine
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 120-129 doi: 10.1007/s11465-014-0300-3
In this paper, error modeling and analysis of a typical 3-degree of freedom translational Parallel Kinematic Machine is presented. This mechanism provides translational motion along the Cartesian X-, Y- and Z- axes. It consists of three limbs each having an arm and forearm with prismatic-revolute-revolute-revolute joints. The moving or tool platform maintains same orientation in the entire workspace due to its joint arrangement. From inverse kinematics, the joint angles for a given position of tool platform necessary for the error modeling and analysis are obtained. Error modeling is done based on the differentiation of the inverse kinematic equations. Variation of pose errors along X, Y and Z directions for a set of dimensions of the parallel kinematic machine is presented. A non-dimensional performance index, namely, global error transformation index is used to study the influence of dimensions and its corresponding global maximum pose error is reported. An attempt is made to find the optimal dimensions of the Parallel Kinematic Machine using Genetic Algorithms in MATLAB. The methodology presented and the results obtained are useful for predicting the performance capability of the Parallel Kinematic Machine under study.
关键词: translational Parallel Kinematic Machine error modeling global error transformation index
Singularity loci of an orthogonal spherical two-degree-of-freedom parallel mechanism
Jialun YANG, Feng GAO,
《机械工程前沿(英文)》 2009年 第4卷 第4期 页码 379-385 doi: 10.1007/s11465-009-0075-0
关键词: 2-DOF orthogonal spherical parallel mechanism singularity loci self-motions
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 34-40 doi: 10.1007/s11465-014-0290-1
As the instant centers in planar mechanisms, the instantaneous poles (or instant poles, in brief) can be used for kinematic analysis in spherical mechanisms. One of the mandatory steps in this analysis is the determination of the location of these poles. This paper presents a theorem showing analytically that the locus of an unknown secondary instant pole in two-degree-of-freedom (2-DOF) spherical mechanisms is a great circle (GC). The exact location of the pole on its GC is obtained based on the configuration of the mechanism and velocity ratio of the two inputs. Moreover, using the results of the theorem, a geometrical technique is presented to determine the GC of the pole.
关键词: spherical mechanisms instantaneous poles great circle angular velocity
Stiffness of a 3-degree of freedom translational parallel kinematic machine
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 233-241 doi: 10.1007/s11465-014-0312-z
In this paper, a typical 3-degree of freedom (3-DOF) translational parallel kinematic machine (PKM) is studied and analyzed whose tool platform has only translations along X-, Y- and Z-axes. It consists of three limbs, each of which have arm and forearm with prismatic-revolute-revolute-revolute (PRRR) joints. Inverse kinematics analysis is carried out to find the slider coordinates and joint angles for a given position of tool platform. Stiffness modeling is done based on the compliance matrices of arm and forearm of each limb. Using the stiffness modeling the variations of minimum and maximum translational stiffness in the workspace are analyzed. For various architectural parameters of the 3-DOF PKM the tendency of variations on the minimum and maximum stiffness over the entire workspace is studied; and also the deflections of the tool platform along X, Y, and Z directions with respect to various forces are presented.
关键词: 3-DOF translational PKM inverse kinematics stiffness modeling translational stiffness
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 344-353 doi: 10.1007/s11465-014-0320-z
This paper is a detailed exploration of instantaneous poles for a class of two-degree-of-freedom (two-DOF) spherical mechanisms (SMs) with seven links or bars. For two-DOF SMs, the secondary instantaneous poles (the ones which cannot be found by direct inspection) must lie on the specified great circles. For many of these mechanisms, however, some of these great circles cannot be obtained by a direct application of Aronhold-Kennedy theorem. This paper presents geometrical and analytical techniques to locate these unknown great circles for three topologies of seven-bar two-DOF SMs.
关键词: spherical mechanisms instantaneous poles Aronhold-Kennedy theorem great circles pencil of meridian
MA Lv-zhong, GUO Zong-he, YANG Qi-zhi, YIN Xiao-qin, HAN Ya-li, SHEN Hui-ping
《机械工程前沿(英文)》 2006年 第1卷 第2期 页码 227-232 doi: 10.1007/s11465-006-0005-3
《环境科学与工程前沿(英文)》 2023年 第17卷 第3期 doi: 10.1007/s11783-023-1628-x
● Metabolome can distinguish pregnant women exposure to PFOA at different degrees.
关键词: Perfluorooctanoic acid Exposure Pregnant women Metabolomic GSH Microbiota metabolism
Microdamage study of granite under thermomechanical coupling based on the particle flow code
《结构与土木工程前沿(英文)》 页码 1413-1427 doi: 10.1007/s11709-023-0953-2
关键词: thermomechanical coupling effect granite improved linear parallel bond model thermal property particle flow code
Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 78-98 doi: 10.1007/s11709-022-0936-8
关键词: CFD–FEM coupling steel beam wind ceiling jet numerical heat transfer
《化学科学与工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11705-023-2378-9
关键词: MXene sacrificial template oxidative self-coupling Co nanoparticles imine
Zhenhua LI, Weihan WANG, Dongxue YIN, Jing LV, Xinbin MA
《化学科学与工程前沿(英文)》 2012年 第6卷 第4期 页码 410-414 doi: 10.1007/s11705-012-1213-5
关键词: palladium CO coupling dialkyl oxalate alkyl nitrite decomposition
Thermodynamic and economic analyses of a coal and biomass indirect coupling power generation system
Buqing YE, Rui ZHANG, Jin CAO, Bingquan SHI, Xun ZHOU, Dong LIU
《能源前沿(英文)》 2020年 第14卷 第3期 页码 590-606 doi: 10.1007/s11708-020-0809-6
关键词: biomass indirect coupling system process simulation thermodynamic analysis economic analysis
Enhancing the aromatic selectivity of cyclohexane aromatization by CO2 coupling
《化学科学与工程前沿(英文)》 2023年 第17卷 第11期 页码 1801-1808 doi: 10.1007/s11705-023-2325-9
关键词: aromatics carbon dioxide aromatization coupling reaction ZSM-5 zeolite
标题 作者 时间 类型 操作
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
Application of consistent geometric decomposition theorem to dynamic finite element of 3D composite beam based on experimental and numerical analyses
Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI
期刊论文
Error analysis and optimization of a 3-degree of freedom translational Parallel Kinematic Machine
null
期刊论文
Singularity loci of an orthogonal spherical two-degree-of-freedom parallel mechanism
Jialun YANG, Feng GAO,
期刊论文
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
Precision analysis of a weakly-coupled parallel mechanism with three translational degrees of freedom
MA Lv-zhong, GUO Zong-he, YANG Qi-zhi, YIN Xiao-qin, HAN Ya-li, SHEN Hui-ping
期刊论文
Untargeted metabolomic analysis of pregnant women exposure to perfluorooctanoic acid at different degrees
期刊论文
catalysts derived from zeolitic imidazolate framework@MXene composites for efficient oxidative self-coupling
期刊论文
Effect of alkyl nitrite decomposition on catalytic performance of CO coupling reaction over supported
Zhenhua LI, Weihan WANG, Dongxue YIN, Jing LV, Xinbin MA
期刊论文
Thermodynamic and economic analyses of a coal and biomass indirect coupling power generation system
Buqing YE, Rui ZHANG, Jin CAO, Bingquan SHI, Xun ZHOU, Dong LIU
期刊论文