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A Probabilistic Method for motion analysis of Caisson Breakwaters

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China Ocean Engineering 2006年第1期20卷 73-84页

作者：王元战朱志伟董少伟 Tianjin Key Laboratory of Harbor and Ocean Engineering School of Civil Engineering Tianjin University Tianjin300072China Transport Planning and Research Institute ofthe Ministry of Communication Beijing100029China

It is assumed that, during the design period, the waves acting on breakwaters are divided into three types： standing wave, broken wave and breaking wave,and the wave heights fit the Rayleigh distribution while the water depths, wave periods and duration of breaking wave impact force fit normal distribution. Based on the random samples of water depths, wave heights, wave periods and duration of breaking wave impact force, the types of waves acting on breakwaters are distinguished and the time-history model of the wave force is determined. The motions of caisson breakwaters under the wave force are simulated by a dynamic numerical model and the statistic characteristics of the dynamic responses are analyzed with the Monte Carlo method. A probabilistic procedure to analyze the motion of the breakwater is developed therein. The procedure is illustrated by an example.

关键词： caisson breakwater motion analysis probabilistic method Monte Carlo simulation

motion analysis OF TAPER MACHINING USING FOUR-AXIS WEDM MACHINE TOOL

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Transactions of Nanjing University of Aeronautics and Astronautics 2006年第2期23卷 149-153页

作者：王旭亮谷安南京航空航天大学航空宇航学院南京航空航天大学机电学院

The configuration and the reference frame of the four-axis wire-electric discharge machining （WEDM） machine tool are introduced. Based on the motion analysis of the four-axis WEDM machine tool, an algorithm for controlling the four-axis motion is proposed. The algorithm is applicable to both the invariable and variable taper machining. motion loci of the machining platform and the wire guiding head are deduced by the algorithm according to the bottom surface locus of the workpiece and the taper angle. The algorithm is used in the CNC system of the four-axis WEDM machine tool and confirmed to be effective.

关键词： WEDM taper four-axis simultaneous motion motion analysis

motion analysis of waste rock in gas-solids fluidized bed in coal dry beneficiation

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Journal of Coal Science & Engineering(China) 2002年第2期8卷 88-92页

作者：郭迎福陈安华张永忠邓志鹏毛树楷 ChginaUniversityofMiningandTechnology Xuzhou221008China InstituteofVibrationEmpactandDiagnosis XiangtanPolytechnleUniversityXianggian411201China

Through the analysis of forces acting on the waste rock in the gas solid fluidized bed, the waste rock velocity equations and displacement equations in the gas solids fluidized bed were achieved and the influential factors of the waste rock motion in the fluidized bed were studied in this paper. The conclusions show that the primary factors influencing the waste rock motion are the waste rock grain size and the scraper velocity according to the computer simulation. This has provided the theoretical foundation both for improving the separating effect and ascertaining the length of the separating cell.

关键词： gas solids fluidized bed coal dry beneficiation motion analysis

Mechanism Design and motion analysis of Heavy⁃Load Transfer Robot with Parallel Four⁃Bar Mechanism

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第5期39卷 606-618页

作者： ZHANG Jing WANG Dongbao WU Guangping GUO Hongwei LIU Rongqiang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024P.R.China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240P.R.China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001P.R.China

Heavy-load transfer robots are widely used in automobile production and machinery manufacturing to improve production *** order to meet the needs of large billet transfer,a 4-DOF transfer robot is designed in this paper,which consists of parallel four-bar *** Jacobian matrix referring to the mapping matrix from the joint velocity to the operating space velocity of the transfer robot can be solved by the differential-vector *** mean value of the Jacobian matrix condition number in the workspace is used as the global performance index of the robot velocity and the optimization *** constraint condition is established based on the actual working *** the linkage length optimization is carried out to decrease the length of the linkage and to increase the global performance index of *** total length of robot rods is reduced by 6.12%.The global performance index of velocity is improved by 45.15%.Taking the optimized rod length as the mechanism parameter,the distribution of the motion space of the transfer robot is ***,the results show that the proposed method for establishing the Jacobian matrix of the lower-mobility robot and for the optimization of the rods based on the velocity global performance index is accurate and *** workspace distribution of the robot meets the design requirements.

关键词： parameter optimization motion analysis mechanism design transfer robot heavy-load

motion analysis and Modeling of Pneumatic Bellows Robotic Arm

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Motion Analysis and Modeling of Pneumatic Bellows Robotic Ar...

motion information analysis system based on acceleration signals

第43届中国控制会议

作者： Shu Luo Jundong Wu Huai Xiao Chun-Yi Su Daiki Sato Jinhua She Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Laboratory for Future Interdisciplinary Research of Science and Technology (FIRST) Tokyo Institute of Technology Gina Cody School of Engineering and Computer Science Concordia University The School of Engineering Tokyo University of Technology

Pneumatic soft robots are increasingly valued for their lightweight, flexibility and adaptability to complex environments. Among various structures, pneumatic soft robotic arm is widely used in the fields of medical rehabilitation,complex terrain exploration, and service industry, etc., making it a popular form of pneumatic soft robots. In practical applications, precise control of soft robotic arms is very important, which requires a complete understanding of their motion patterns and corresponding modelling. However, due to their nonlinearity, the motion patterns of soft robotic arms are complex,which makes the motion analysis and modeling of the soft robotic arm a challenging topic. Based on the above considerations,this paper analyzes the motion of a pneumatic soft robotic arm and develops a prediction model for its input-output characteristics. First, we introduce the basic structure and experimental platform of a pneumatic soft robotic arm, after that, we analyze its performances including spatial reach, response time and bending angle, and designed an application experiment based on the results of the analysis. In the end, we use BP neural network to establish a model of the input air pressure and the end coordinates, and the accuracy of the model was verified through experiments.

关键词： Soft robot Pneumatic bellows robotic arm motion analysis Neural network

来源： cnki会议评论

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Journal of Shanghai University(English Edition) 2010年第2期14卷 122-125页

作者：刘书朋陈林代丽丽陆燕青严壮志 School of Communication and Information Engineering Shanghai University

A motion information analysis system based on the acceleration data is proposed in this paper,consisting of filtering,feature extraction and *** Kalman filter is adopted to eliminate the *** the time-domain and frequency-domain analysis,acceleration features like the amplitude,the period and the acceleration region values are ***,the accuracy of the motion classification is improved by using the k-nearest neighbor （KNN） algorithm.

关键词： motion analysis acceleration data Kalman filter k-nearest neighbor (KNN)

“动作捕捉”的王者——记美国魔神motion analysis公司

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艺术教育 2017年第8X期 38-41页

作者：史际平陈婧雅美国魔神运动分析技术公司东南亚地区及太平洋地区

在美国洛杉矶刚刚结束的2017 SIGGRAPH展会上,由美国魔神公司(motion analysis Corp.)与中国台湾的OXON公司联手展示的VR动感体验引起轰动。展览期间,每天都有人在公司的展位边排队等候体验令人难忘的虚拟现实技术。美国魔神公司(以下... 详细信息

在美国洛杉矶刚刚结束的2017 SIGGRAPH展会上,由美国魔神公司(motion analysis Corp.)与中国台湾的OXON公司联手展示的VR动感体验引起轰动。展览期间,每天都有人在公司的展位边排队等候体验令人难忘的虚拟现实技术。美国魔神公司(以下简称“魔神公司”)

关键词：动作捕捉 motion analysis

motion analysis游戏互动工作室

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艺术教育 2017年第Z7期 189-页

简介美国魔神公司的数字动作捕捉及分析系统,是一款可以实现室外日光直射条件下使用的动作捕捉系统,也是一款可以实现5000个标志点捕捉的数字动作捕捉系统。动作捕捉及分析系统由数字捕捉镜头,EagleHub和Cortex软件组成,可极其精确地捕... 详细信息

简介美国魔神公司的数字动作捕捉及分析系统,是一款可以实现室外日光直射条件下使用的动作捕捉系统,也是一款可以实现5000个标志点捕捉的数字动作捕捉系统。动作捕捉及分析系统由数字捕捉镜头,EagleHub和Cortex软件组成,可极其精确地捕捉复杂动作。实时功能使用户可以在同一时间观察到目标某个细微动作,也可以与魔神公司的其他镜头自由组合,从而优化工作室的效能。魔神公司是动作捕捉行业领导者,为全球近千用户提供卓越性能的光学动作捕捉及分析系统,遍及动画制作、运动分析、工业测量与控制等各个领域。具有代表性的电影、电视作品有《指环王》《猿人星球》《金刚》《天空上尉和明日世界》《最终幻想》等。

关键词：动作捕捉分析系统 motion analysis 工作室

Rotational Swashplate Pulse Continuously Variable Transmission Based on Helical Gear Axial Meshing Transmission

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Chinese Journal of Mechanical Engineering 2012年第6期25卷 1138-1143页

作者： SUN Jiandong FU Wenyu LEI Hong TIAN E LIU Ziping College of Mechanical and Electrical Engineering Beijing Union UniversityBeijing 100020China

The current research on pulse continuously variable transmission（CVT） is mainly focused on reducing the pulse degree and making pulse degrees a constant value. Current research mainly confined to find out new design parameters by using the method of optimization, and reduce the pulse degree of pulse CVT and its range of variation. But the fact is that the reduction of the pulse degree is not significant. This article presents a new structure of mechanical pulse CVT--the rotational swashplate pulse CVT with driven by helical gear axial meshing. This transmission is simple and compact in structure and low in pulsatile rate （it adopts 6 guide rods）, and the pulsatile degree is irrelevant to the transmission ratio. Theoretically, pulsatile rate could be reduced to zero if appropriate curved surface of the swashplate is used. Compared with the connecting rod pulse CVT, the present struc^tre uses helical gear mechanism as transmission part and it avoids unbalanced inertial force in the former model. This paper analyzes the principle of driving of this transmission, presents its mechanical structure, and discusses its motion characteristics. Experimental prototype of this type of CVT has been manufactured. Tests for the transmission efficiency（when the rotational speed of the output shaft is the maximum） and the angular velocity of the output shaft have been carried out, and data have been analyzed. The experimental results show that the speed of the output shaft for the experimental prototype is slightly lower than the theoretical value, and the transmission efficiency of the experimental prototype is about 70%. The pulse degree of the CVT discussed in this paper is less than the existing pulse CVT of other types, and it is irrelevant to the transmission ratio of the CVT. The research provides the new idea to the CVT study.

关键词： pulse continuously variable transmission pulsatile rate motion analysis