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Influence of kinematic redundancy on the singularity-free workspace of parallel kinematic machines
Jens KOTLARSKI, Bodo HEIMANN, Tobias ORTMAIER
《机械工程前沿(英文)》 2012年 第7卷 第2期 页码 120-134 doi: 10.1007/s11465-012-0321-8
In this paper the effect of kinematic redundancy in order to reduce the singularity loci of the direct kinematics and to increase the operational, i.e., singularity-free, workspace is demonstrated. The proposed approach consists of additional prismatic actuators allowing one or more base joints to move linearly. As a result, a selective reconfiguration can be performed in order to avoid singular configurations. Exemplarily, kinematically redundant schemes of four structures, the 3RRR, the 3RPR, the 6UPS, and the 6RUS, are considered. The relationship between the redundancy and the operational workspace is studied and several analysis examples demonstrate the effectiveness of the proposed concept. Furthermore, the additional benefit of an increasing number of redundant actuators is discussed.
关键词: parallel robots kinematic redundancy singularity avoidance operational workspace
Feasible workspace regions for general two-revolute manipulator
Conghui LIANG, Marco CECCARELLI
《机械工程前沿(英文)》 2011年 第6卷 第4期 页码 397-408 doi: 10.1007/s11465-011-0228-9
In this paper, a topology is presented for feasible workspace regions in general two-revolute manipulators. The design problem and concept of feasible workspace regions have been discussed as linked to each other. Design equations are formulated by arbitrarily prescribing four workspace boundary points. The so-called feasible workspace regions are the intersection of three different sub-regions, which are given by constraint curves as function of the relative positions of three workspace boundary points. By using a parametric study, all topologies for three sub-regions are figured out. Corresponding areas in cross section plane are determined for prescribing the position of a feasible workspace point as function of the topology for sub-regions. A classification has been proposed to determine and to characterize the combination of the topologies for those sub-regions. All topologies for feasible workspace regions are figured out and they are discussed as a design tool. Three general cases are analyzed in details to characterize workspace design capabilities for general two-revolute manipulators.
关键词: workspace two-revolute manipulators topology analysis design
Xinqun ZHU, Hong HAO
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 321-333 doi: 10.1007/s11709-012-0161-y
关键词: integrated structural health monitoring operational conditions vibration and guided wave
Po-Chih LEE, Jyh-Jone LEE
《机械工程前沿(英文)》 2012年 第7卷 第2期 页码 163-187 doi: 10.1007/s11465-012-0324-5
This paper presents the analysis of three parallel manipulators with Schoenflies-motion. Each parallel manipulator possesses two limbs in structure and the end-effector has three DOFs (degree of freedom) in the translational motion and one DOF in rotational motion about a given direction axis with respect to the world coordinate system. The three isoconstrained parallel manipulators have the structures denoted as CuuUwHw-//-CvvUwHw, CuRuuUhw-//-CvRvvUhwand CuPuUhw-//- CvPvUhw. The kinematic equations are first introduced for each manipulator. Then, Jacobian matrix, singularity, workspace, and performance index for each mechanism are subsequently derived and analysed for the first time. The results can be helpful for the engineers to evaluate such kind of parallel robots for possible application in industry where pick-and-place motion is required.
关键词: parallel manipulator schoenflies motion kinematics singularity workspace performance index
A review of condition-based maintenance: Its prognostic and operational aspects
Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG
《工程管理前沿(英文)》 2020年 第7卷 第3期 页码 323-334 doi: 10.1007/s42524-020-0121-5
关键词: condition-based maintenance prognostics operational decision-making reliability
Alin STOICA, Doina PISLA, Szilaghyi ANDRAS, Bogdan GHERMAN, Bela-Zoltan GYURKA, Nicolae PLITEA
《机械工程前沿(英文)》 2013年 第8卷 第1期 页码 70-79 doi: 10.1007/s11465-013-0365-4
In the last ten years, due to development in robotic assisted surgery, the minimally invasive surgery has greatly changed. Until now, the vast majority of robots used in surgery, have serial structures. Due to the orientation parallel module, the structure is able to reduce the pressure exerted on the entrance point in the patient’s abdominal wall. The parallel robot can also handle both a laparoscope as well an active instrument for different surgical procedures. The advantage of this parallel structure is that the geometric model has been obtained through an analytical approach. The kinematic modelling of a new parallel architecture, the inverse and direct geometric model and the inverse and direct kinematic models for velocities and accelerations are being determined. The paper will demonstrate that with this parallel structure, one can obtain the necessary workspace required for a minimally invasive operation. The robot workspace was generated using the inverse geometric model. An in-depth study of different types of singularity is performed, allowing the development of safe control algorithms of the experimental model. Some kinematic simulation results and the experimental model of the robot are presented in the paper.
关键词: parallel robot minimally invasive surgery kinematics simulation
一种具有大工作空间的轻量级力反馈手套 Article
郑宇铠, 王党校, 王子琦, 张昱, 张玉茹, 徐卫良
《工程(英文)》 2018年 第4卷 第6期 页码 869-880 doi: 10.1016/j.eng.2018.10.003
在虚拟现实场景中,佩戴力反馈手套是一种有效的增强穿戴者与虚拟物体交互沉浸感的方法。这种手套的设计难点在于需要提供足够大的手指运动工作空间,在模拟自由空间和约束空间交互时提供所需的力反馈感觉,以及确保一个轻量级的结构。本文提出了一种将气动驱动器安装在使用者手背侧的力反馈手套。该手套采用了一种凸轮连杆组合机构,利用带有弯曲滑槽和三个运动副的连杆将阻力从气缸活塞杆传递到指尖。为了得到穿戴者指尖反馈力的一个较大的法向分量,通过分析带有三个运动副的连杆上的力平衡,计算出了滑槽的轮廓。本文研制了质量为245 g 的五指力反馈手套样机,建立了可穿戴的力测量系统,对自由空间和约束空间的力反馈性能进行了定量评价。实验结果表明,该手套在自由空间模拟中平均阻力小于0.1 N,在约束空间模拟中指尖力最大为4 N。实验进一步证实,这种手套能够保证手指的自由移动以及模拟典型的抓取操作手势。
Review of operational management in intelligent agriculture based on the Internet of Things
Xiangpei HU, Lijun SUN, Yaxian ZHOU, Junhu RUAN
《工程管理前沿(英文)》 2020年 第7卷 第3期 页码 309-322 doi: 10.1007/s42524-020-0107-3
关键词: Internet of Things (IoT) agricultural Internet of Things (Agri-IoT) operational management intelligent agriculture precision management traceability
Jeremy J. SCHREIFELS, Shuxiao WANG, Jiming HAO
《能源前沿(英文)》 2012年 第6卷 第1期 页码 98-105 doi: 10.1007/s11708-012-0171-4
关键词:
nitrogen oxides (NO
王永红,刘兵,张永刚
《中国工程科学》 2013年 第15卷 第12期 页码 107-112
特长海底隧道运营是一个极其复杂的系统工程,存在较大的不确定性和安全风险。根据隧道工程运营期风险评估的一般流程,对渤海湾海底隧道工程在其运营期的风险进行了评估。评估中考虑的主要风险因素有水害、衬砌裂损、冻害、衬砌腐蚀、震害、洞内空气污染、火灾和列车脱轨事故8 种类型。综合运用信心指数法和层次分析法,参照隧道与地下工程风险接受准则和风险等级标准,对渤海湾海底隧道运营期间的风险进行估计与评价。给出了该海底隧道运营期的风险等级,并讨论了本评估工作中尚存在的一些问题和今后有待深入的工作。
Alessandro CARBONARI, Leonardo MESSI, Berardo NATICCHIA, Massimo VACCARINI, Massimiliano PIRANI
《工程管理前沿(英文)》 2020年 第7卷 第1期 页码 89-103 doi: 10.1007/s42524-019-0037-0
关键词: BIM building management system cyber-physical system facility management holonic system
Ze Sun,Chenglin Liu,Guimin Lu,Xingfu Song,Jianguo Yu
《化学科学与工程前沿(英文)》 2015年 第9卷 第4期 页码 522-531 doi: 10.1007/s11705-015-1539-x
关键词: finite element method magnesium electrolysis cell electric field
胡亚安,张瑞凯,李云
《中国工程科学》 2009年 第11卷 第9期 页码 52-58
从水力学条件论证了船闸采用4级运行方案的可行性。通过原型调试,采取中间及阐首优化后的输水方式运行,基本消除了闸室第一分流口空化,船闸在超过设计的45.2 m水头下工作条件较好,在三峡船闸完建期156 m蓄水位船闸采用4级运行方式具优越性。
朱林,张晓囡,徐兴杰
《中国工程科学》 2005年 第7卷 第3期 页码 69-73
探讨了网络中心战的核心内容,指出信息融合技术是网络中心战面临的巨大技术挑战之一,并论述了信息融合技术的主要研究内容,包括信息融合的功能模型、体系结构、信息融合系统工程及融合的算法,总结了信息融合技术在国内外的发展现状,在此基础上,分析了网络中心战条件下信息融合技术的发展方向。
颜宏,李泽椿,马清云,田翠英
《中国工程科学》 2000年 第2卷 第11期 页码 88-93
文章介绍中国气象预报业务工程体系的建设和发展过程、现代气象预报业务所包含的子系统及其相 关技术以及21世纪气象预报业务建设的技术发展趋势和展望。
标题 作者 时间 类型 操作
Influence of kinematic redundancy on the singularity-free workspace of parallel kinematic machines
Jens KOTLARSKI, Bodo HEIMANN, Tobias ORTMAIER
期刊论文
Feasible workspace regions for general two-revolute manipulator
Conghui LIANG, Marco CECCARELLI
期刊论文
Development of an integrated structural health monitoring system for bridge structures in operational
Xinqun ZHU, Hong HAO
期刊论文
Singularity and workspace analysis of three isoconstrained parallel manipulators with schoenflies motion
Po-Chih LEE, Jyh-Jone LEE
期刊论文
A review of condition-based maintenance: Its prognostic and operational aspects
Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG
期刊论文
Kinematic, workspace and singularity analysis of a new parallel robot used in minimally invasive surgery
Alin STOICA, Doina PISLA, Szilaghyi ANDRAS, Bogdan GHERMAN, Bela-Zoltan GYURKA, Nicolae PLITEA
期刊论文
Review of operational management in intelligent agriculture based on the Internet of Things
Xiangpei HU, Lijun SUN, Yaxian ZHOU, Junhu RUAN
期刊论文
Design and operational considerations for selective catalytic reduction technologies at coal-fired boilers
Jeremy J. SCHREIFELS, Shuxiao WANG, Jiming HAO
期刊论文
Development of a BIM-based holonic system for real-time monitoring of building operational efficiency
Alessandro CARBONARI, Leonardo MESSI, Berardo NATICCHIA, Massimo VACCARINI, Massimiliano PIRANI
期刊论文
Effects of operational and structural parameters on cell voltage of industrial magnesium electrolysis
Ze Sun,Chenglin Liu,Guimin Lu,Xingfu Song,Jianguo Yu
期刊论文