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Kinematics and simulations of space manipulator in three work modes

Kinematics and simulations of space manipulator in three wor...

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International Symposium on systems and Control in Aerospace and Astronautics (ISSCAA)

作者： Fuhai Zhang Yili Fu Shibo Yan Shuguo Wang State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

ISBN: (纸本)9781424460434

In recent years, research on space robotics has attracted considerable attention. Kinematics of the free-flying or free-floating space manipulator system, including a spacecraft and a manipulator mounted on the spacecraft, is a significant problem. In free-floating work mode, the spacecraft will move freely in response to the disturbances caused by the manipulator motions. From the view of application, change of the spacecraft attitude for the space manipulator system is not desirable. Therefore, it is of significance to adopt the free-floating with zero-disturbance spacecraft attitude work mode. This paper presents an overview of the kinematics of the space manipulator system. Position and velocity kinematics solutions in three work modes are analyzed. The kinematics differences among the three work modes are formulated. The simulation results validate the effectiveness of the kinematics solutions in the three work modes.

关键词： Space vehicles Kinematics Joints Manipulator dynamics Aerospace electronics Jacobian matrices

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Design and realization of an interactive medical images three dimension visualization system

Design and realization of an interactive medical images thre...

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International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Dongmei Wu Heqiang Tian Guangxin Hao Zhijiang Du Lining Sun State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

In this paper, an interactive medical three-dimensional visualization system is realized based on VTK. This program is designed primarily for the CT images to realize such functions as reading and displaying of image files and interactive three-dimensional reconstruction. The threshold for three-dimensional reconstruction is interactively selected by marching squares algorithm (MS), which is more convenient and more interactive for three-dimensional reconstruction by marching cubes algorithm (MC) than the traditional method that the various reconstruction thresholds are simply entered based on experience. The functional stability and good human-computer interaction of this system greatly improve accuracy and scientificity of medical diagnosis and treatment planning. The system is designed based on modular, which is not only used as a separate visualization system for medical diagnosis, but also its functions will be further added and constantly improved aiming at the different surgical needs.

关键词： Image reconstruction Three dimensional displays Mice DICOM Pixel Data visualization

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Three-dimensional geometric modeling of the spine based on reverse engineering technology

Three-dimensional geometric modeling of the spine based on r...

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International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Lining Sun Heqiang Tian Dongmei Wu Zhijiang Du State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

In human skeletal system, the spine shape is very complex, so its geometric model reconstruction is particularly important. The spine geometric model is created by the main use of reverse modeling method. In this paper, the three-dimensional spine mesh model is reconstructed firstly by marching cubes (MC) algorithmwhich is a popular technique for isosurface extraction from a volume data set. Then, the mesh model is turned into a realistic geometric model by reverse engineering methods. It can be seen that the spine geometric model and its anatomy has a good similarity by comparing and analyzing. This kind of modeling method provides a choice for complex bone structures. And the final geometric model can be imported into three-dimensional modeling software and finite element analysis software for surgical planning and biomechanical analysis.

关键词： Solid modeling Surface reconstruction Data models Reverse engineering Image reconstruction Surface fitting Three dimensional displays

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Stable and accurate trajectory control technology for the wafer transfer robot

Stable and accurate trajectory control technology for the wa...

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International Conference on Information and Automation (ICIA)

作者： Yanjie Liu Yong Hu Xiaofei Zheng State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

During the processing of wafer, in order to avoid the friction between wafer and wafer box, and to guarantee the clean state of the working environment simultaneously, small contour error and little vibration are required for wafer transfer robot to deliver wafer, i.e., to achieve stable and accurate trajectory for wafer delivery. To lessen contour error, suppress vibration, a kind of control algorithm has been proposed in this paper combining cross-coupled synchronized control and input shaping. Via cross-coupled synchronized control, synchronization of the actuating joint can be improved and the contour accuracy can be enhanced; through the shaping of the driving impulses for the shoulder joint and the elbow joint by input shaper, the vibration at the end-effector can be reduced. Based on the experiments verified on the planar joint wafer transfer robot, it shows that the synchronizing and vibration-suppressing performance is excellent by taking advantage of the method covering both cross-coupled synchronized control and input shaping.

关键词： Robot kinematics Vibration control Shape control Error correction Master-slave robotics and automation Friction Trajectory Synchronous motors Robot control

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Design and primitive study of a cylindrical traveling wave ultrasonic motor using outer excitation

Design and primitive study of a cylindrical traveling wave u...

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International Symposium on Optomechatronic Technologies, ISOT

作者： Junkao Liu Shengjun Shi Weishan Chen Huijun Dong State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

A cylindrical traveling wave ultrasonic motor using outer excitation of two bending transducers is proposed in this paper. To avoid the drawbacks of conventional traveling wave ultrasonic motors, sandwich structure of PZT elements and d 33 mode of PZT are used here. Working principle and design analysis by means of FEM method are detailed. A prototype motor has been fabricated and tested. Although the tested results of output torque was not ideal as compared with desired, the original configuration idea has great potential to obtain strong out put in our further study on it.

关键词： Stators Transducers Acoustics Vibrations Resonant frequency Materials Shape

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Joint driver and control design for large torque, long arm space remote manipulator

Joint driver and control design for large torque, long arm s...

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International Conference on Information and Automation (ICIA)

作者： Chuangqiang Guo Fenglei Ni Jingting Sun Yechao Liu Hong Liu State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China

This paper presents an overview of the structure and requirements of a ground engineering model for a space remote manipulator system, with long arm and large torque driver capacity. The system consists of a 6 DOFs robot arm composed of six identical modular joints, and a large-error tolerated end effector. A FPGA based joint controller hardware structure is built to form a distributed control scheme of the robot arm, while a fourth-order hybrid controller based on the joint torque feedback is adopted to reduce the influence of joint flexibility, brought by the harmonic drivers and torque sensor, on the control precision. A single-joint control experiment, designed to lift up a load at the tip of a link, about two meters in length, is used to test the ability of trajectory tracking in the gravity field.

关键词： Control design Torque control Manipulators Orbital robotics End effectors Field programmable gate arrays Hardware Distributed control Robot sensing systems Feedback

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Automatic localization of AC and PC landmarks in T2-weighted MR volumetric neuroimages

Automatic localization of AC and PC landmarks in T2-weighted...

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International Conference on Information and Automation (ICIA)

作者： Guangcai Zhang Yili Fu Shuguo Wang Wenpeng Gao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China

A novel method is presented for automatic identification of the anterior commissure (AC) and posterior commissure (PC) in T2-weighted MR volumetric images (MRI). AC and PC are two critical landmarks of human brain. It is important to accurately identify them for brain segmentation, registration, functional neurosurgery, human brain mapping, and particularly for the Talairach transformation. The algorithm of identifying them consists of four steps: (1) Identify the corpus callosum and select the region of interest; (2) Identify the fornix and locate the initial AC; (3) Segment part of the third ventricle and locate the initial PC; (4) Refine the positions of AC and PC. The algorithm has been validated quantitatively with 20 T2-weighted MRI data sets. The mean errors of the localization of them were 1.50 mm (AC) and 1.60 mm (PC). It took about 15 seconds for identifying them on P4 3.0 GHz. This fully automatic algorithm is potentially useful in clinic and for research.

关键词： Magnetic resonance imaging Humans Neurosurgery Shape robotics and automation Image segmentation Brain mapping Image analysis Anatomy Laboratories

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Design and analysis of a 6-DOF parallel robot used in artificial cervical disc replacement surgery

Design and analysis of a 6-DOF parallel robot used in artifi...

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International Conference on Information and Automation (ICIA)

作者： Heqiang Tian Dongmei Wu Zhijiang Du Lining Sun State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China

ISBN: (纸本)9781424457014;9781424457045

This paper presents the design of a 6-DOF parallel robot used in the artificial cervical disc replacement surgery, which is used to complete positioning and grinding between prosthesis and bone mating surfaces and whose moving platform is connected to the fixed platform by six UPS (Universal-Prismatic-Spherical) serial chains. In the paper, inverse position, a first-order static influence coefficient matrix, Jacobian matrix, and workspace factors are analyzed for the 6-UPS parallel mechanism and the analysis results of statics, singularity and workspace are given, which is used to guide the robot structure design. What's more, the CAD model of the robot is analyzed by finite element methods, which shows that the robot has adequate stiffness. Finally, a comprehensive analysis shows that the 6-UPS parallel robot is suitable for bone mating surfaces grinding in the artificial cervical disc replacement surgery.

关键词： Parallel robots Surgery Bones Prosthetics robotics and automation Design automation Laboratories Jacobian matrices Finite element methods Educational technology

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Research on a central pattern generator bionic coupling control system of robot

Research on a central pattern generator bionic coupling cont...

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International Conference on Information and Automation (ICIA)

作者： Tingting Wang Wei Guo Fusheng Zha Mantian Li State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China

ISBN: (纸本)9781424457014

Animal's walking is a complex rhythmic motion that has good celerity, adaptability and stability. Walking is controlled and harmonized by the animal's nerve-muscle control system. The joints are coupling during walking and are regulated by the nerve center. Based on this mechanism, a concept of bionic coupling control system is presented. This system which simulates the integration effect of animal's nerve consists of a central pattern generator (CPG) planner built based on the three local neurons network model of CPG, a forward path of motorneuron and a feedback path. Finally, a simulative experiment is done on a platform of robot leg, and the coupling control of robot leg is realized by a single CPG.

关键词： Centralized control Robot control Control systems Legged locomotion Motion control Neurons Neurofeedback Robot kinematics Couplings robotics and automation

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Design and analysis of a kind of biomimetic continuum robot

Design and analysis of a kind of biomimetic continuum robot

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2010 IEEE International Conference on robotics and Biomimetics, ROBIO 2010

作者： Zhao, Qiang Gao, Fang Northeast Forestry University State Key Laboratory of Robotics and System/Computer School Harbin Institute of Technology Harbin Heilongjiang 150000 China Mechtronical Engineering School Harbin Institute of Technology Harbin Heilongjiang 150001 China

ISBN: (纸本)9781424493173

Continuum robot is a new kind of bionic robot, and it is the beneficial supplement to the traditional joint-type robot. This paper presented a design scheme of Hook Joint type continuum robot, and fully discussed its structure and mechanism connection mode. An exponential product based matrix transformation is used to describe the position and orientation of the end-effector. The forward kinematics is also discussed in this paper. Numerical examples are completed with Matlab M language and simulation results indicate the validity of the proposed analysis method. © 2010 IEEE.

关键词： Machine design

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