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| 1 | Auto-normalization algorithm for robotic precision drilling system in aircraft component assembly显示文摘A novel approach is proposed to detect the normal vector to product surface in real time for the robotic precision drilling system in aircraft component assembly, and the auto-normalization algorithm is presented based on the detection system. Firstly, the deviation between the normal vector and the spindle axis is measured by the four laser displacement sensors installed at the head of the multi-function end effector. Then, the robot target attitude is inversely solved according to the auto-normalization algorithm. Finally, adjust the robot to the target attitude via pitch and yaw rotations about the tool center point and the spindle axis is corrected in line with the normal vector simultaneously. To test and verify the auto-normalization algorithm, an experimental platform is established in which the laser tracker is introduced for accurate measurement. The results show that the deviations between the corrected spindle axis and the normal vector are all reduced to less than 0.5°, with the mean value 0.32°. It is demonstrated the detection method and the autonormalization algorithm are feasible and reliable. | Tian Wei Zhou Weixue Zhou Wei Liao Wenhe Zeng Yuanfan | 2013 | Chinese Journal of Aeronautics2013，26，2： | 35 |
| 2 | Calibration of robotic drilling systems with a moving rail显示文摘Industrial robots are widely used in aircraft assembly systems such as robotic drilling systems. It is necessary to expand a robot's working range with a moving rail. A method for improving the position accuracy of an automated assembly system with an industrial robot mounted on a moving rail is proposed. A multi-station method is used to control the robot in this study. The robot only works at stations which are certain positions defined on the moving rail. The calibration of the robot system is composed by the calibration of the robot and the calibration of the stations.The calibration of the robot is based on error similarity and inverse distance weighted interpolation.The calibration of the stations is based on a magnetic strip and a magnetic sensor. Validation tests were performed in this study, which showed that the accuracy of the robot system gained significant improvement using the proposed method. The absolute position errors were reduced by about 85%to less than 0.3 mm compared with the maximum nearly 2 mm before calibration. | Tian Wei Zeng Yuanfan Zhou Wei Liao Wenhe | 2014 | Chinese Journal of Aeronautics2014，27，6： | 14 |
| 3 | Design of Drilling and Riveting Multi-functional End Effector for CFRP and Aluminum Components in Robotic Aircraft Assembly显示文摘To fulfill the demands for higher quality,efficiency and flexibility in aviation industry,a multi-functional end effector is designed to automate the drilling and riveting processes in assembling carbon fiber reinforced polymer(CFRP)and aluminum components for a robotic aircraft assembly system.To meet the specific functional requirements for blind rivet installation on CFRP and aluminum materials,additional modules are incorporated on the end effector aside of the basic processing modules for drilling.And all of these processing modules allow for a onestep-drilling-countersinking process,hole inspection,automatic rivet feed,rivet geometry check,sealant application,rivet insertion and installation.Besides,to guarantee the better quality of the hole drilled and joints riveted,several online detection and adjustment measures are applied to this end effector,including the reference detection and perpendicular calibration,which could effectively ensure the positioning precision and perpendicular accuracy as demanded.Finally,the test result shows that this end effector is capable of producing each hole to a positioning precision within ±0.5 mm,aperpendicular accuracy within 0.3°,a diameter tolerance of H8,and a countersink depth tolerance of±0.01 mm.Moreover,it could drill and rivet up to three joints per minute,with acceptable shearing and tensile strength. | Zhang Lin Tian Wei Li Dawei Hong Peng Li Zhenyu Zhou Weixue Liao Wenhe | 2018 | Transactions of Nanjing University of Aeronautics and Astronautics2018，35，3： | 5 |
| 4 | Formation of interlayer gap and control of interlayer burr in dry drilling of stacked aluminum alloy plates显示文摘In aircraft assembly, interlayer burr formation in dry drilling of stacked metal materials is a common problem. Traditional manual deburring operation seriously affects the assembly quality and assembly efficiency, is time-consuming and costly, and is not conducive to aircraft automatic assembly based on industrial robot. In this paper, the formation of drilling exit burr and the influence of interlayer gap on interlayer burr formation were studied, and the mechanism of interlayer gap formation in drilling stacked aluminum alloy plates was investigated, a simplified mathematical model of interlayer gap based on the theory of plates and shells and finite element method was established. The relationship between interlayer gap and interlayer burr, as well as the effect of feed rate and pressing force on interlayer burr height and interlayer gap was discussed. The result shows that theoretical interlayer gap has a positive correlation with interlayer burr height and preloading pressing force is an effective method to control interlayer burr formation. | Tian Wei Hu Jian Liao Wenhe Bu Yin Zhang Lin | 2016 | Chinese Journal of Aeronautics2016，29，1： | 5 |
| 5 | Manufacturing Resource Planning Technology Based on Genetic Programming Simulationnn显示文摘Network-based manufacturing is a kind of distributed system, which enables manufacturers to finish production tasks as well as to grasp the opportunities in the market, even if manufacturing resources are insufficient. One of the main problems in network-based manufacturing is the allocation of resources and the assignment of tasks rationally, according to flexible resource distribution. The mapping rules and relations between production techniques and resources are proposed, followed by the definition of the resource unit. Ultimately, the genetic programming method for the optimization of the manufacturing system is put forward. A set of software for the optimization system of simulation process using genetic programming techniques has been developed, and the problems of manufacturing resource planning in network-based manufacturing are solved with the simulation of optimizing methods by genetic programming. The optimum proposal of hardware planning, selection of company and scheduling will be obtained in theory to help company managers in scientific decision-making. | GAO Shiwen LIAO Wenhe GUO Yu LIU Jinshan SU Yan | 2009 | Chinese Journal of Mechanical Engineering2009，22，2： | 3 |
| 6 | Minimum cost attribute reduction in decision-theoretic rough set models显示文摘 | Xiuyi Jia Wenhe Liao Zhenmin Tang Lin Shang | 2013 | Information Sciences2013，，： | 2 |
| 7 | Design of a custom angled a- butment for dental implants using computer - aided design and nonlinear finite element analysis显示文摘 | Ting Wu Wenhe Liao Ning Dai | 2010 | Journal of Biomechanics2010，43，10： | 1 |
| 8 | Key technolo- gies for ASP - based product customization service system for SMEs: A case study 显示文摘 | YAN SU WENHE LIAO YU GUO QIULIN DING | 2009 | International Journal Advanced Manufacturing Technology2009，42，： | 1 |
| 9 | Direct Curvature Scale Space: Theory and Corner Detection显示文摘 | Zhong Baojiang Liao Wenhe | 2007 | IEEE Transactions on Pattern Analysis and Machine Intelligence2007，29，3： | 1 |
| 10 | Application and Development of Case-based Reasoning in Fixture Design 显示文摘 | Wang Qi Liao Wenhe | 2004 | Journal of Southeast University2004，20，2： | 1 |
| 11 | On an opti-mization representation of decision-theoretic rough set mod-el 显示文摘 | Jia Xiuyi Tang Zhenmin Liao Wenhe | 2014 | International Journal of Approximate Reasoning2014，55，1： | 1 |
| 12 | Representation and share of part feature information in web-based parts library 显示文摘 | Li Yingguang Lu Yong Liao Wenhe | 2006 | Expert Sys Appl2006，31，4： | 1 |
| 13 | Application and Development of Case-based Reasoning in Fixture Design 显示文摘 | Wang Qi Liao Wenhe | 2004 | Journal of Southeast University2004，20，2： | 1 |
| 14 | Internet-based machining parameter optimization and management system for high speed machining显示文摘 | WU Meiping LIAO Wenhe | 2005 | Transactions of Nanjing University of Aeronautics & Astronautic2005，22，1： | 1 |
| 15 | An Orbit Determination Using SGP4 Propagator and Doppler Shifts for CubeSats显示文摘The two line elements(TLEs),released by the North American Aerospace Defense Command(NORAD),are chosen for CubeSats' mission operators.Unfortunately,they have errors and other accompanied problems,which cause large deviations in the in-track component.When a TLE value is available at a certain epoch,the dominant error is the angular error.It is proposed to correct the angular error by solving-for the mean argument of latitude at the desired epoch.A batch least squares technique and range rate measurements are used for the correction process.With the assistance of satellite tool kit(STK)software and Matlab,a simulation to verify the orbit determination(OD)technique is implemented.This paper provides an angular correction low cost OD method and presents a complete analysis for various test cases.This approach maintains high accuracy in cross-track and radial and makes great improvement in in-track at the same time,but it is exclusive for circular orbits.When it is applied to an elliptical orbit,the error will be unacceptable.Therefore,the angular error is corrected using the longitude of periapsis which totally mitigates the error at the epoch under consideration.For inclinations less than 20 o,the mean longitude is preferred for the angular correction as it provides more accuracy compared with the mean argument of latitude. | Wesam M.Elmahy Zhang Xiang Lu Zhengliang Liao Wenhe | 2018 | Transactions of Nanjing University of Aeronautics and Astronautics2018，35，3： | 1 |
| 16 | Knowledge inte gration model for networked manufacturing显示文摘 | LIU Jiaoiian LIAO Wenhe GUO Yu | 2011 | Advanced Ma- terials Research2011，，3： | 1 |
| 17 | Critical Thrust Force Forecasting for Drilling Exit Delamination of Carbon Fibre Reinforced Plastics显示文摘Exit delamination is excessive drilling thrust force.Therefore,it is necessary to investigate the critical thrust force which cause exit delamination when carbon fibre reinforced plastics(CRFP)is drilled.According to the linear elastic fracture mechanics,the mechanics of composite material and the classical thin plate bending theory,a common theoretical model of the critical drilling thrust force for CFRP plates is established.Compared with the experimental data of previous studies,the results show that the theoretical values agree well with the experimental values.This model can be used to forecast the critical thrust force for the drilling-induced delamination of CFRP. | Zhang Lin Hu Jian Tian Wei Liao Wenhe Bu Yin | 2017 | Transactions of Nanjing University of Aeronautics and Astronautics2017，34，4： | 1 |
| 18 | Application and development of case-based reasoning in fixture design显示文摘 | Wang Qi Liao Wenhe | 2002 | Journal of Southest University:English Edition2002，20，2： | 1 |
| 19 | Minimum cost attribute reduction in decisiontheoretic rough set models显示文摘 | JIA Xiuyi LIAO Wenhe TANG Zhenmin LIN Shang | 2013 | Information Sciences2013，219，： | 1 |
| 20 | An ASP-based product customization service system for SMEs:a case study in construction machinery显示文摘 | Su Yan Liao Wenhe Guo Yu | 2008 | International Journal of Enterprise Information Systems2008，4，1： | 1 |
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