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| 1 | Inkjet printing for flexible electronics:Materials,processes and equipments显示文摘Inkjet printing, known as digital writing technique, can directly deposit functional materials to form pattern onto substrate. This paper provides an overview of inkjet printing technologies for flexible electronics. Firstly, we highlight materials challenges in implementing flexible devices into practical application, especially for inkjet printing process. Then the micro/nano-patterning technologies of inkjet printing are discussed, including conventional inkjet printing techniques and electrohydrodynamic printing techniques. Thirdly, the related equipments on inkjet printing are shown. Finally, challenges for its future development are also discussed. The main purpose of the work is to condense the basic knowledge and highlight the challenges associated with the burgeoning and exciting field of inkjet printing for flexible electronics. | YIN ZhouPing HUANG YongAn BU NingBin WANG XiaoMei XIONG YouLun | 2010 | Chinese Science Bulletin2010，55，30： | 25 |
| 2 | Third-order point contact approach for five-axis sculptured surface machining using non-ball-end tools(II): Tool positioning strategy显示文摘Based on the mathematical model describing the third-order approximation of the cutter envelope surface according to one given cutter location(CL),a tool positioning strategy is proposed for efficiently machining free-form surfaces with non-ball-end cutters.The optimal CL is obtained by adjusting the inclination and tilt angles of the cutter until its envelope surface and the design surface have the third-order contact at the cutter contact(CC)point,which results in a wide machining strip.The strategy can handle the constraints of machine joint angle limits,global collision avoidance and tool path smoothness in a nature way,and can be applied to general rotary cutters and complex surfaces.Numerical examples demonstrate that the third-order point contact approach can improve the machining strip width greatly as compared with the recently reported second-order one. | ZHU LiMin 1 ,DING Han 2 &XIONG YouLun 2 1State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China 2State Key Laboratory of Digital Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan 430074, China | 2010 | Science China(Technological Sciences)2010，53，8： | 23 |
| 3 | Variable-step integration method for milling chatter stability prediction with multiple delays显示文摘This paper analyzes the stability of milling with variable pitch cutter and tool runout cases characterized by multiple delays,and proposes a new variable-step numerical integration method for efficient and accurate stability prediction. The variable-step technique is emphasized here to expand the numerical integration method,especially for the low radial immersion cases with multiple delays. First,the calculation accuracy of the numerical integration method is discussed and the variable-step algorithm is developed for milling stability prediction for single-delay and multiple-delay cases,respectively. The milling stability with variable pitch cutter is analyzed and the result is compared with those predicted with the frequency domain method and the improved full-discretization method. The influence of the runout effect on the stability boundary is investigated by the presented method. The numerical simulation shows that the cutter runout effect increases the stability boundary,and the increasing stability limit is verified by the milling chatter experimental results in the previous research. The numerical and experiment results verify the validity of the proposed method. | ZHANG XiaoJian XIONG CaiHua DING Ye XIONG YouLun | 2011 | Science China(Technological Sciences)2011，54，12： | 17 |
| 4 | Tool path generation and simulation of dynamic cutting process for five-axis NC machining显示文摘Five-axis NC machining provides a valid and efficient way to manufacture the mechanical parts with complex shapes,which are widely used in aerospace,energy and national defense industries. Its technology innovations have attracted much attention in recent years. In this paper,the state-of-the-art techniques for five-axis machining process planning are summarized and the challenging problems are analyzed from the perspectives of tool path generation,integrated geometric/mechanistic simulation and machining stability analysis. The recent progresses in accessibility-based tool orientation optimization,cutter location (CL) planning for line contact and three-order point contact machining,shape control of cutter envelope surface and milling stability prediction are introduced in detail. Finally,the emerging trends and future challenges are briefly discussed. | DING Han BI QingZhen ZHU LiMin XIONG YouLun | 2010 | Chinese Science Bulletin2010，55，30： | 11 |
| 5 | Kinematics constrained five-axis tool path planning for high material removal rate显示文摘Traditional five-axis tool path planning methods mostly focus on differential geometric characteristics between the cutter and the workpiece surface to increase the material removal rate(i.e.,by minimizing path length,improving curvature matching,maximizing local cutting width,etc.) . However,material removal rate is not only related to geometric conditions such as the local cutting width,but also constrained by feeding speed as well as the motion capacity of the five-axis machine. This research integrates machine tool kinematics and cutter-workpiece contact kinematics to present a general kinematical model for five-axis machining process. Major steps of the proposed method include:(1) to establish the forward kinematical relationship between the motion of the machine tool axes and the cutter contact point;(2) to establish a tool path optimization model for high material removal rate based on both differential geometrical property and the contact kinematics between the cutter and workpiece;(3) to convert cutter orientation and cutting direction optimization problem into a concave quadratic planning(QP) model. Tool path will finally be generated from the underlying optimal cutting direction field. Through solving the time-optimal trajectory generation problem and machining experiment,we demonstrate the validity and effectiveness of the proposed method. | YE Tao XIONG CalHua XIONG YouLun ZHAO Can | 2011 | Science China(Technological Sciences)2011，54，12： | 7 |
| 6 | Driving force planning in shield tunneling based on Markov decision processes显示文摘In shield tunneling, the control system needs very reliable capability of deviation rectifying in order to ensure that the tunnel trajectory meets the permissible criterion. To this goal, we present an approach that adopts Markov decision process (MDP) theory to plan the driving force with explicit representation of the uncertainty during excavation. The shield attitudes of possi- ble world and driving forces during excavation are scattered as a state set and an action set, respectively. In particular, an evaluation function is proposed with consideration of the stability of driving force and the deviation of shield attitude. Unlike the deterministic approach, the driving forces based on MDP model lead to an uncertain effect and the attitude is known only with an imprecise probability. We consider the case that the transition probability varies in a given domain estimated by field data, and discuss the optimal policy based on the interval arithmetic. The validity of the approach is discussed by comparing the driving force planning with the actual operating data from the field records of Line 9 in Tianjin. It is proved that the MDP model is reasonable enough to predict the driving force for automatic deviation rectifying. | HU XiangTao HUANG YongAn YIN ZhouPing XIONG YouLun | 2012 | Science China(Technological Sciences)2012，55，4： | 6 |
| 7 | Computational manufacturing显示文摘This paper presents a general framework for computational manufacturing. The methodology of computational manufacturing aims at integrating computational geometry, machining principle, sensor information fusion, optimization, computational intelligence and virtual prototyping to solve problems of the modeling, reasoning, control, planning and scheduling of manufacturing processes and systems. There are three typical problems in computational manufacturing, i.e., scheduling (time-domain), geometric reasoning (space-domain) and decision- making (interaction between time-domain and space-domain). Some theoretical fundamentals of computational manufacturing are also discussed. | DING Han and XIONG Youlun(1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China 2. School of Mechanical Engineering & Science, Huazhong University of Sci. & Tech., Wuhan 430074, China) | 2002 | Progress in Natural Science:Materials International2002，12，9： | 4 |
| 8 | Defective point data reconstruction based on improved process of morphological operations显示文摘In industry,the defective point data often make most surface reconstruction methods suffer from inherent problems that some specific aided information is difficult to obtain. To solve the problem,a novel implicit reconstruction method without any such information is proposed. This approach extends morphological operations into 3D space and provides an improved procedure to construct off-set gradient functions for indirect approximation. By this method,the dual relative functions guarantee a minimal crust surrounding the point data. They can generate a smooth and watertight resulting surface,filling holes and merging overlapping samples reasonably. Compared with other existing methods,the proposed method is better suited to handle defective point clouds in a convenient and efficient manner. The feasibility and effectiveness of the method are demonstrated through a series of practical examples. | YIN ZhouPing MO Kun XIONG YouLun | 2011 | Science China(Technological Sciences)2011，54，12： | 2 |
| 9 | A manifold approach to generating iso-scallop trajectories in three-axis machining显示文摘A novel approach of iso-scallop trajectory generation for smooth manifold surfaces has been developed. Firstly,by defining homeomorphism mapping relations and differentiable structures,the smooth manifold surface is mapped into several Euclidean planes,thus its trajectory generation can be decomposed into planar curve-filling tasks. Secondly,in the generation of direction-parallel trajectories,the calculation of the cutting interval and the curvature is given,depending on the generation of the first curve in the projection view. Thirdly,after automatic adherences of inverse projection curves,the filled curves are mapped into the original surface inversely to form trajectories. Although the required trajectories are iso-scallop,the trajectory intervals are variable according to the curvature changes at the projection point,which is advantageous to improving the trajectory quality. The proposed approach has appealing merits of dimensionality reduction,which decreases the algorithm complexity. Finally,numerical and machining examples are given to illustrate its feasibility and validity. | CHEN XuBing LI WenLong XIONG YouLun | 2011 | Science China(Technological Sciences)2011，54，1： | 2 |
| 10 | A novel approach to fixture design on suppressing machining vibration of flexible workpiece显示文摘 | Shasha Zeng Xiaojin Wan Wenlong Li Zhouping Yin Youlun Xiong | 2012 | International Journal of Machine Tools and Manufacture2012，，： | 1 |
| 11 | High probability impulse noise-removing algorithm based on mathematical morphology 显示文摘 | DENG Zefeng YIN Zhouping XIONG Youlun | 2007 | IEEE Signal Processing Letters2007，14，1： | 1 |
| 12 | The fast multi- level Fuzzy edge detection of blurry images显示文摘 | WU Jinbo YIN Zhouping XIONG Youlun | 2007 | IEEE Sig- nal Processing Letters2007，14，5： | 1 |
| 13 | Virtual prototyping of mold design:geometric mouldability analysis for near-net-shape manufactured parts by feature recognition and geometric reasoning显示文摘 | Yin Zhouping Ding Han Xiong Youlun | 2001 | Computer-Aided Design2001，33，2： | 1 |
| 14 | Kinematic generation of ruled surface based on rational motion of point-line显示文摘This paper studies representation of rigid combination of a directed line and a reference point on it(here referred to as a 'point-line') using dual quaternions.The geometric problem of rational ruled surface design is viewed as the kinematic prob-lem of rational point-line motion design.By using the screw theory in kinematics,mappings from the spaces of lines and point-lines in Euclidean three-dimensional space into the hyperplanes in dual quaternion space are constructed,respectively.The problem of rational point-line motion design is then converted to that of projective Bézier or B-spline image curve design in hyperplane of dual quaternions.This kinematic method can unify the geometric design of ruled surfaces and tool path gen-eration for five-axis numerical control(NC) machining. | ZHANG XiaoMing ZHU LiMin DING Han XIONG YouLun | 2012 | Science China(Technological Sciences)2012，55，1： | 1 |
| 15 | A randomized comparative study on mifepristone alone and in combination with tamoxifen for emergency contraception显示文摘 | Chang H H Youlun G Tie Y | 2002 | Contraception2002，66，： | 1 |
| 16 | The fast multilevel fuzzy edge detection of blurry images显示文摘 | Wu Jinbo Yin Zhouping Xiong Youlun | 2007 | IEEE Signal Processing Letter2007，14，5： | 1 |
| 17 | Virtual prototyping of mold design:geometric mould ability anal- ysis for near-net-shape manufactured parts by feature recognition and geometric reasoning显示文摘 | YIN ZHOUPING DING HAN XIONG YOULUN | 2001 | Computer Aided Design2001，33，2： | 1 |
| 18 | Mouldability Analysis for Near- net- shape Manufactured Parts Using Freedom Cones显示文摘 | Yin Zhouping Ding Han Xiong Youlun | 2000 | International Journal of Advanced Manufacturing Technology2000，16，3： | 1 |
| 19 | Grasp capability analysis of multifingered robot hands显示文摘 | XIONG Caihua LI Youfu XIONG Youlun | 1999 | Robotics and Autonomous Systems1999，，27： | 1 |
| 20 | Numerical Robust Stability Estimation in Milling Process显示文摘The conventional prediction of milling stability has been extensively studied based on the assumptions that the milling process dynamics is time invariant. However, nominal cutting parameters cannot guarantee the stability of milling process at the shop floor level since there exists many uncertain factors in a practical manufacturing environment. This paper proposes a novel numerical method to estimate the upper and lower bounds of Lobe diagram, which is used to predict the milling stability in a robust way by taking into account the uncertain parameters of milling system. Time finite element method, a milling stability theory is adopted as the conventional deterministic model. The uncertain dynamics parameters are dealt with by the non-probabilistic model in which the parameters with uncertainties are assumed to be bounded and there is no need for probabilistic distribution densities functions. By doing so, interval instead of deterministic stability Lobe is obtained, which guarantees the stability of milling process in an uncertain milling environment. In the simulations, the upper and lower bounds of Lobe diagram obtained by the changes of modal parameters of spindle-tool system and cutting coefficients are given, respectively. The simulation results show that the proposed method is effective and can obtain satisfying bounds of Lobe diagrams. The proposed method is helpful for researchers at shop floor to making decision on machining parameters selection. | ZHANG Xiaoming ZHU Limin DING Han XIONG Youlun | 2012 | Chinese Journal of Mechanical Engineering2012，25，5： | 1 |
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