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New form of geodetic coordinate system taking two length quantity as coordinate parameters
Yimin SHI, Ziyang ZHU, Yeming FAN
《结构与土木工程前沿(英文)》 2009年 第3卷 第1期 页码 105-110 doi: 10.1007/s11709-009-0014-5
关键词: geodetic coordinate system meridian and parallel circle coordinate parameter the first fundamental form on the ellipsoidal surface latitudinal scale factor of length
张人骧,张人骥
《中国工程科学》 2005年 第7卷 第4期 页码 42-46
总结50年实验,证明人体经络通路现象具有生物学客观真实性,可能有助于进一步总结中华传统医药学宝贵经验;概括经络科学对人体生命调节现象的理论性概念,对与生命共存的人体经络循行给出数学表述。
关键词: 中华自然理念 经络科学 对称与不对称转换调制原理 四维经络循行图 经络贯通效率
Application of digital holography to circle flow bed boiler measurement
PU Shiliang, WANG Qinghui, CEN Kefa, Denis Lebrun, REN Kuanfang
《能源前沿(英文)》 2007年 第1卷 第2期 页码 218-222 doi: 10.1007/s11708-007-0029-3
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
唐孝威,沈小雷,何宏建
《中国工程科学》 2008年 第10卷 第11期 页码 14-17
在考察针刺穴位治疗作用的基础上,根据现有的实验事实,将人体经络的观念和经改进后的神经-内分泌-免疫系统的观念统一起来,提出人体经络是具有敏感节点和功能连接的神经-内分泌-免疫网络的假说。人体经络的复杂网络不仅是遍及全身的系统,而且可以通过敏感节点及其功能连接对身体起调控作用。
关键词: 人体经络 针刺穴位 神经-内分泌-免疫系统 复杂网络
ZHANG Xuewen, XUAN Wei, JIANG Tao, JI Degang, YANG Yongsheng, ZHANG Dan, XIE Yingjun, MENG Zihui, ZHAO Jisheng
《医学前沿(英文)》 2007年 第1卷 第1期 页码 46-48 doi: 10.1007/s11684-007-0009-3
Structural optimization of typical rigid links in a parallel kinematic machine
Xinjun LIU, Zhidong LI, Xiang CHEN
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 344-353 doi: 10.1007/s11465-011-0227-x
The motion dynamics and accuracy of parallel kinematic machines largely depend on the weights and rigidity of typical rigid links. Therefore, these parts should be designed in such a way that they are light but rigid. This work employs the techniques of topology and size optimization to design two typical rigid links of a parallel kinematic machine (PKM) and subsequently obtains applicable structures for them. The calculation models are established, and a new algorithm called the Guide-Weight method is introduced to solve topology optimization problems. The commercial software Ansys is used to perform size optimization.
关键词: topology optimization size optimization parallel kinematic machine (PKM)
Optimal design of a linkage–cam mechanism-based redundantly actuated parallel manipulator
《机械工程前沿(英文)》 2021年 第16卷 第3期 页码 451-467 doi: 10.1007/s11465-021-0634-6
关键词: redundant actuation parallel manipulator linkage–cam mechanism Jacobian optimal design
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
YANG Zhiyong, XU Meng, HUANG Tian, NI Yanbing
《机械工程前沿(英文)》 2007年 第2卷 第1期 页码 82-88 doi: 10.1007/s11465-007-0014-x
关键词: acceleration reconfigurable parallel additive sequence parallel mechanism
Cusp points and assembly changing motions in the PRR-PR-PRR planar parallel manipulator
《机械工程前沿(英文)》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0743-x
关键词: planar parallel manipulator assembly changing motions cusp points quartic polynomial discriminant of repeated roots
A rolling 3-UPU parallel mechanism
Zhihuai MIAO, Yan’an YAO, Xianwen KONG
《机械工程前沿(英文)》 2013年 第8卷 第4期 页码 340-349 doi: 10.1007/s11465-013-0282-6
A novel rolling mechanism is proposed based on a 3-UPU parallel mechanism in this paper. The rolling mechanism is composed of two platforms connected by three UPU (universal-prismatic-universal) serial-chain type limbs. The degree-of-freedom of the mechanism is analyzed using screw theory. Gait analysis and stability analysis are presented in detail. Four rolling modes of the mechanism are discussed and simulated. The feasibility of the rolling mechanism is verified by means of a physical prototype. Finally, its terrain adaptability is enhanced through planning the rolling gaits.
Group-based multiple pipe routing method for aero-engine focusing on parallel layout
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 798-813 doi: 10.1007/s11465-021-0645-3
关键词: multiple pipe routing optimization algorithm aero-engine pipe grouping parallel layout
New kind of subarea-parallel scanning mode for laser metal deposition shaping
BIAN Hongyou, LIU Weijun, ZHAO Jibin
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 417-422 doi: 10.1007/s11465-007-0071-1
关键词: scanning parallel scanning practical application fabrication efficiency LMDS
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
标题 作者 时间 类型 操作
New form of geodetic coordinate system taking two length quantity as coordinate parameters
Yimin SHI, Ziyang ZHU, Yeming FAN
期刊论文
Application of digital holography to circle flow bed boiler measurement
PU Shiliang, WANG Qinghui, CEN Kefa, Denis Lebrun, REN Kuanfang
期刊论文
Numerical investigation of circle defining curve for two-dimensional problem with general boundaries
Chung Nguyen VAN
期刊论文
Effect of end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture in pancreatic
ZHANG Xuewen, XUAN Wei, JIANG Tao, JI Degang, YANG Yongsheng, ZHANG Dan, XIE Yingjun, MENG Zihui, ZHAO Jisheng
期刊论文
Structural optimization of typical rigid links in a parallel kinematic machine
Xinjun LIU, Zhidong LI, Xiang CHEN
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
Variable identification and automatic tuning of the main module of a servo system of parallel mechanism
YANG Zhiyong, XU Meng, HUANG Tian, NI Yanbing
期刊论文
New kind of subarea-parallel scanning mode for laser metal deposition shaping
BIAN Hongyou, LIU Weijun, ZHAO Jibin
期刊论文