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Influence of Rigidity of Feed System With Ball Screw in NC Lathe on Positioning Precision

Wu Nanxing,Hu Rufu,Sun Qinghong

Strategic Study of CAE 2004, Volume 6, Issue 9, Pages 46-49

Abstract:

Rigidity of feed system with ball screw in NC lathe has a major influence on loss of momentum and

Keywords： NC lathe rigidity loss of momentum positioning precision

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Dynamic characteristics of an NC table with phase space reconstruction

Linhong WANG, Bo WU, Runsheng DU, Shuzi YANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2, Pages 179-183 doi: 10.1007/s11465-009-0018-9

Abstract: The dynamic properties of a numerical control (NC) table directly interfere with the accuracy and surfacereconstruction, the correlation dimension, maximum Lyapunov exponent, and dynamic time series measured from the NCThe chaotic characteristic of the dynamic properties of the NC table is revealed via various approachesTherefore, an NC table is a nonlinear dynamic system.

Keywords： NC table chaotic characteristic phase-space reconstruction correlation dimension maximum Lyapunov exponent

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Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar

Min WANG, Jianzhong HU, Tao ZAN

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 4, Pages 431-437 doi: 10.1007/s11465-010-0110-1

Abstract: Based on this model, a new method for the kinematic error separation in five-axis numerical control (NCbar is used to measure the relative distance between the spindle and the worktable in the motion of NCmeasured by telescoping double ball bar is substituted into the model to obtain kinematic error of NC

Keywords： error modeling error separation telescoping double ball bar five-axis numerical control (NC) machining

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Dynamic characteristics of NC table with SVD

WANG Linhong, WU Bo, DU Runsheng, YANG Shuzi

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 385-391 doi: 10.1007/s11465-008-0052-z

Abstract: SVD (singular value decomposition) method to study dynamic characteristics of a numerical control (NCAcceleration signals of the NC table at three directions are tested; the singular spectrum of the signals

Keywords： Acceleration vibration source chaotic energy dynamic

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Kinematic simulation of a parallel NC machine tool in the manufacturing process

ZHANG Jian-min, FAN Yu, JIA Dong-yun, ZOU Qiu-ling, WU Ying

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2, Pages 173-176 doi: 10.1007/s11465-006-0020-4

Abstract: Aimed at enhancing the research status of parallel machine tools, this paper introduces the structure of a 6-SPS parallel machine tool and explains the application significance of the kinematic simulation of the manufacturing pro

Keywords： 6-SPS kinematic simulation manufacturing application significance

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Detecting interaction/complexitywithin crowd movements using braid entropy Research Papers

Murat AKPULAT, Murat EKİNCİ

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 6, Pages 849-861 doi: 10.1631/FITEE.1800313

Abstract:

The segmentation of moving and non-moving regions in an image within the field of crowd analysis is a crucial process in terms of understanding crowd behavior. In many studies, similar movements were segmented according to the location, adjacency to each other, direction, and average speed. However, these segments may not in turn indicate the same types of behavior in each region. The purpose of this study is to better understand crowd behavior by locally measuring the degree of interaction/complexity within the segment. For this purpose, the flow of motion in the image is primarily represented as a series of trajectories. The image is divided into hexagonal cells and the finite time braid entropy (FTBE) values are calculated according to the different projection angles of each cell. These values depend on the complexity of the spiral structure that the trajectories generated throughout the movement and show the degree of interaction among pedestrians. In this study, behaviors of different complexities determined in segments are pictured as similar movements on the whole. This study has been tested on 49 different video sequences from the UCF and CUHK databases.

Keywords： Crowd behavior Motion segmentation Motion entropy Crowd scene analysis Complexity detection Braid entropy

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New evaluation method on the precision of NC machine tools

Zhao Wanhua,Zhang Jun,Liu Hui,Yang Xiaojun

Strategic Study of CAE 2013, Volume 15, Issue 1, Pages 93-98

Abstract:

The performance of computerized numerical control (CNC) machine tool is evaluated by the traditional positioning error and the positioning repeatability, which is in quasi static and cannot reflect the precision of machine tool in the process of movement and machining. In this paper, a novel precision evaluation method which takes the dynamic precision as index is proposed for high-speed machine tool. The precision of machine tool is described through the consistence of the actual trajectory and the ideal command. The specific evaluation index of dynamic precision is provided. Meanwhile, the measure method of evaluation index is put forward. It can be obtained that this new evaluation method of machine tool precision can evaluate the quality of key performance in CNC machine tool systematically and roundly.

Keywords： NC machine tools dynamic precision evaluation index impact factors

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Upgrade and Organized Innovation of China’s NC Generation Products: A Case Study in Quanzhou City

Wei Feng,Zhou Yuan and Xue Lan

Strategic Study of CAE 2016, Volume 18, Issue 6, Pages 110-116 doi: 10.15302/J-SSCAE-2016.06.022

Abstract:

The "Numerical Control (NC) Generation Innovation Project" aims to apply NC technologyThis paper takes the update and upgrade of NC equipment in Quanzhou city as a case study.Focusing on practical experience with the NC Generation Innovation Project within the framework of innovationof strong demand pull from the user market and effective technology push from R&D agencies, the NC

Keywords： NC generation generic technology technology diffusion innovation governance organized innovation

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Behavior of aqueous stable colloidal nano-C

Jing HUO,Ye YU,Ling GE,Bo ZHANG,Yiliang HE

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2, Pages 197-205 doi: 10.1007/s11783-014-0624-6

Abstract: This work examined the behavior of aqueous stable colloidal nano-C (nC ) aggregates under differentResults show that the nC aggregates became more dispersive and restored the capability of generating, and the kinetic rate constant of generating the singlet oxygen for nC aggregates was improved.The mean size of nC aggregates in the presence of TX100 had no obvious variations when the pH rangedCollective data suggest that variations in physicochemical properties of nC aggregates are strongly

Keywords： nano-C₆₀ (nC₆₀) aggregates photochemical reactivity artificial biological membrane

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NC flame pipe cutting machine tool based on open architecture CNC system

Xiaogen NIE, Yanbing LIU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2, Pages 147-152 doi: 10.1007/s11465-009-0025-x

Abstract: Based on the analysis of the principle and flame movement of a pipe cutting machine tool, a retrofit NCThe paper emphasizes on the NC system structure and the method for directly creating the NC file accordingFurther, the paper develops the program and sets up the open and module NC system.

Keywords： flame pipe cutting flame incision tracks CNC open architecture CNC system

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CNC programming system for complex components based on KBE within integrated environment of CAD/CAPP/CAM

Shengwen ZHANG, Guicheng WANG, Liang ZHANG, Xifeng FANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 97-102 doi: 10.1007/s11465-009-0007-z

Abstract: To promote the research and development of modern digital and intelligent manufacturing technology and overcome shortcomings of computerized numerical control(CNC) programming for complex components, an innovative idea has been proposed to introduce knowledge based engineering (KBE) into the field of CNC programming within the integrated environment of CAD/CAPP/CAM. This paper constructs the architecture of CNC programming based on KBE within CAD/CAPP/CAM and explores the key technology of applying KBE to CNC programming — knowledge representation, knowledge acquisition, knowledge reasoning, and generalized knowledge base system of CNC programming. The integration of the CAD/CAM system and the CAPP system of enterprises has been achieved by taking the powerful CAD/CAM system of UG NX as a platform. The prototype system of CNC programming for complex components based on KBE within CAD/CAPP/CAM has been developed by means of UG/Open,VC++6.0, and SQL Sever 2000. Finally, a frame example, one of the complex components of a marine diesel, is presented, and the academic production and the intelligence of the system are verified.

Keywords： NC programming CAD/CAPP/CAM KBE

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Modeling and Real-time Performance Analysis of Switched Ethernet by Network Calculus

Wang Xiaoxin,Liu Luyuan,Liu Jing,Ma Jinjue

Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 55-59

Abstract:

The real-time performance of switched Ethernet is a hot research field. However, there isn't an effective modeling to describe it until now. Through analyzing the structure of classical switch, a switch model by network calculus is proposed, in which the data flow is divided into real-time flow and non-real-time flow and the arrival curve, service curve, the max delay and max storage needed are got. The max delay provides theory direction for transmitting real-time data in switched Ethernet and the max storage provides the theory reference for constructing switch in real-time industrial Ethernet.

Keywords： network calculus switch arrival curve service curve delay

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Validation of wind vectors retrieved by the HY-2A microwave scatterometer using NC EP model data

Mu Bo,Lin Mingsen,Peng Hailong,Song Qingtao,Zhou Wu

Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 39-45

Abstract:

The microwave scatterometer onboard HY-2A Satellite mainly makes measurements of surface wind vectors over the global oceans. In order to ensure that the quality of wind vectors produced by ground application system software,the product must be validated to provide the basis for the quantitative application of the data product.This paper performs the validation of wind vectorsretrieved by HY-2A scatterometer using national centers for environmental prediction (NCEP )model data. The validation result suggests that the validationmethod cangive the precision of the overall wind vectors, and also can be used to analyze the precision characteristics relating with thescanningpencil-beam system and the scatterometer measurement mechanism.Meanwhile the validation can aid to identify the short-term anomaly of measuring performance.

Keywords： microwave scatterometer windvectors inversion validation