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| 1 | Improvement on On-line Ferrograph Image Identification显示文摘A newly developed on-line visual ferrograph(OLVF) gives a new way for engine wear state monitoring. However, the reliability of on-line wear debris image processing is challenged in both monitoring ship engines and the Caterpillar bench test, which weren’t reported in previous studies. Two problems were encountered in monitoring engines and processing images. First, small wear debris becomes hard to be identified from the image background after monitoring for a period of time. Second, the identification accuracy for wear debris is greatly reduced by background noise because of oil getting dark after running a period of time. Therefore, the methods adopted in image processing are examined. Two main reasons for the problems in wear debris identification are generalized as follows. Generally, the binary threshold was determined by global image pixels, and was easily affected by the non-objective zone in the image. The boundary of the objective zone in the binary image was misrecognized because of oil color becoming lighter during monitoring. Accordingly, improvements were made as follows. The objective zone in a global binary image was identified by scanning a column of pixels, and then a secondary binary process confined in the objective zone was carried out to identify small wear debris. Linear filtering with a specific template was used to depress noise in a binary image, and then a low-pass filtering was performed to eliminate the residual noise. Furthermore,the morphology parameters of single wear debris were extracted by separating each wear debris by a gray stack, and two indexes, WRWR (relative wear rate) and WRWS (relative wear severity), were proposed for wear description. New indexes were provided for on-line monitoring of engines. | WU Tonghai WANG Weigang WU Jiaoyi MAO Junhong XIE Youbai | 2010 | Chinese Journal of Mechanical Engineering2010，23，1： | 8 |
| 2 | MATLAB WEB SERVER AND ITS APPLICATION IN REMOTE COLLABORATIVE DESIGN OF MAGNETIC BEARING SYSTEMS显示文摘Acclimatizing itself to the development of network,Math Works Inc constructed a MATLAB Web Server environment by dint of which one can browse the calculation and plots of MATLAB through Internet directly.The installation and use of the environment is introduced.A code established on the platform of MATLAB,which deals with the modal analysis of magnetic bearing system(MBS) supporting rotors of five degrees of freedom and considering the coupling of thrust bearing with radical bearings is modified to work in the environment.The purpose is to realize a remote call of the code by users through Internet for the performance analysis of the system.Such an application is very important to the concurrent design of MBS and for the utilization of distributive knowledge acquisition resources in collaborative design.The work on modification and realization is described and the results are discussed. | Zhao Aiping Yu Lie Xie Youbai Theory of Lubrication and Bearing Institute,Xi’an Jiaotong University | 2001 | Chinese Journal of Mechanical Engineering2001，14，2： | 6 |
| 3 | Tribological behaviors of spot-textured TiN coatings on M2 high-speed steel under boundary lubricated conditions显示文摘The effect of sliding duration on the tribological behaviors of spot patterned coatings was investigated. Two patterns based on physical vapor deposition (PVD) TiN coatings were used, such as, in-lined (IN) and staggered (ST) spots. The tribological behaviors were evaluated by using a Cameron-Plint wear test rig. The M2 steel discs deposited TiN coatings with IN and ST patterns slid against the ASSAB 17 tool steel pins at a speed of 0.23 m/s, in Shell Tellus T32 lubricant and were loaded with 900 N. The testing results on disc specimens with two types of PVD TiN spot patterns, all coated with a bias voltage of ?180 V and slid for 4, 8 and 11 h respectively, were presented. The results revealed that the in-lined coatings possessed relatively better wear behaviors than the staggered pattern coatings. Mechanisms for such superiority and for the cause of peeling were discussed. A relevant design approach was suggested for the application of such patterned coatings. | Guangneng Dong Meng Hua Jian Li Hing-Yin Ma Youbai Xie | 2007 | Journal of University of Science and Technology Beijing2007，14，4： | 4 |
| 4 | Four basic laws in design science显示文摘A point on the distinction between design and science is given and the connotations of design science are discussed in the paper. Design should be understood as the first step of all human's purposeful activity,which is a daily behavior for everyone. Four laws are summarized,which describe the basic patterns of design and are the constituents of design science. They are the law of design based on existed knowledge,law of incompleteness of design knowledge,law of design centered on new knowledge acquirement and law of competitiveness of design knowledge. The four basic laws show the knowledge essence of design. To enrich the existed knowledge,to make it convenient to be used,to teach designers with high intuition and inspiration in picking useful elements of existed knowledge and shaping competitive ideas and to have strong new knowledge acquirement facility are the basic conditions of good designs. Study of design science will promote the structure of traditional engineering education. An important conclusion is derived that there will be no successful innovation without good design. | Xie Youbai | 2014 | Engineering Sciences2014，12，2： | 4 |
| 5 | ANALYSIS OF COUPLING INFLUENCES OF LABYRINTH SEAL PARAMETERS ON CROSS COUPLED STIFFNESS AND DIRECT DAMPING COEFFICIENT显示文摘Labyrinth seal can cause steam-exciting, the structural and operating parameters of labyrinth seal have effect on stability of rotor-system. For investigating the coupling influences of the structure and operating parameters of labyrinth seals on dynamic coefficients, a model of calculating dynamic coefficients of labyrinth seals is presented using a two control volume model. The coupling influences of parameters on cross-coupled stiffness and direct damping of labyrinth seal are discussed. In the conclusion, a reference of preventing steam-exciting vibration and optimum determination of design parameters of labyrinth seals are provided. | Zhou Shouqin, Xie Youbai (Theory of Lubrication and Bearing Institute, Xi’ an Jiaotiong University) | 2000 | Chinese Journal of Mechanical Engineering2000，13，3： | 3 |
| 6 | 3D-printed models improve surgical planning for correction of severe postburn ankle contracture with an external fixator显示文摘Gradual distraction with an external fixator is a widely used treatment for severe postburn ankle contracture(SPAC).However,application of external fixators is complex,and conventional two-dimensional(2D)imaging-based surgical planning is not particularly helpful due to a lack of spatial geometry.The purpose of this study was to evaluate the surgical planning process for this procedure with patient-specific three-dimension-printed models(3DPMs).In this study,patients coming from two centers were divided into two cohorts(3DPM group vs.control group)depending on whether a 3DPM was used for preoperative surgical planning.Operation duration,improvement in metatarsal-tibial angle(MTA),range of motion(ROM),the American Orthopedic Foot and Ankle Society(AOFAS)scores,complications,and patient-reported satisfaction were compared between two groups.The 3DPM group had significantly shorter operation duration than the control group((2.0±0.3)h vs.(3.2±0.3)h,P<0.01).MTA,ROM,and AOFAS scores between the two groups showed no significant differences pre-operation,after the removal of the external fixator,or at follow-up.Plantigrade feet were achieved and gait was substantially improved in all patients at the final follow-up.Pin-tract infections occurred in two patients(one in each group)during distraction and were treated with wound care and oral antibiotics.Patients in the 3DPM group reported higher satisfaction than those in the control group,owing to better patient-surgeon communication.Surgical planning using patient-specific 3DPMs significantly reduced operation duration and increased patient satisfaction,while providing similar improvements in ankle movement and function compared to traditional surgical planning for the correction of SPAC with external fixators. | Youbai CHEN Zehao NIU Weiqian JIANG Ran TAO Yonghong LEI Lingli GUO Kexue ZHANG Wensen XIA Baoqiang SONG Luyu HUANG Qixu ZHANG Yan HAN | 2021 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2021，22，10： | 3 |
| 7 | STUDY ON CONTACTING MELTING AND ANTI-SKID TECHNOLOGY FOR A TIRE TRACTION ON ICE显示文摘Theoretical analyses and experimental studies of the mechanisms of melting film formation are performed. The results show that frictional heating is the dominant mechanism because temperature behaves in the manner predicted by the theory of frictional heating. A study of the active technology for anti-skid is also made. Conclusions indicate that adjusting tire pneumatic pressure can improve the control stability and the travelling safety of an ice-automobile. | Peng Xudong (Department of Mechatronic Engineering, University of Petroleum) Xie Youbai,Guo Konghui (Xi’ an Jiaotong University) (Jilin University) | 2001 | Chinese Journal of Mechanical Engineering2001，14，3： | 2 |
| 8 | Molecular dynamics simulation of the deposition process of hydrogenated diamond-like carbon (DLC) films显示文摘The deposition process of hydrogenated diamond-like carbon (DLC) film greatly affects its frictional properties. In this study, CH3 radicals are selected as source species to deposit hydrogenated DLC films for molecular dynamics simulation. The growth and structural properties of hydrogenated DLC films are investigated and elucidated in detail. By comparison and statistical analysis, the authors find that the ratio of carbon to hydrogen in the films generally shows a monotonously increasing trend with the increase of impact energy. Carbon atoms are more reactive during deposition and more liable to bond with substrate atoms than hydrogen atoms. In addition, there exists a peak value of the number of hydrogen atoms deposited in hydrogenated DLC films. The trends of the variation are opposite on the two sides of this peak point, and it becomes stable when impact energy is greater than 80 eV. The average relative density also indicates a rising trend along with the increment of impact energy, while it does not reach the saturation value until impact energy comes to 50 eV. The hydrogen content in source species is a key factor to determine the hydrogen content in hydrogenated DLC films. When the hydrogen content in source species is high, the hydrogen content in hydrogenated DLC films is accordingly high. | ZHANG Yujun DONG GuangNeng MAO JunHong XIE YouBai | 2008 | Chinese Science Bulletin2008，53，7： | 2 |
| 9 | Engine wear monitoring with OLVF 显示文摘 | Zhang Yali Mao Junhong Xie Youbai | 2011 | Tribology Transactions2011，54，2： | 1 |
| 10 | Engine wear monitoring with OLVF显示文摘 | ZHANG Yali MAO Junhong XIE Youbai | 2011 | Tribology Transactions2011，54，2： | 1 |
| 11 | Two-body microcutting wear model(part I):two-dimensional roughness model显示文摘 | Zhang Bo Xie Youbai | 1989 | Wear1989，129，： | 1 |
| 12 | Two-body microcutting wear model(part II):three-dimensional roughness model显示文摘 | Zhang Bo Xie Youbai | 1989 | Wear1989，129，： | 1 |
| 13 | Two-body microcutting wear model(part III):stable profile height distribution of a worn surface显示文摘 | Zhang Bo Xie Youbai | 1989 | Wear1989，129，： | 1 |
| 14 | Research on an on-line wear condition monitoring system for marine diesel engine显示文摘 | Yan Liu Zhong Liu Youbai Xie Zhigang Yao | 2000 | Tribology International2000，，12： | 1 |
| 15 | Internet-based distributive knowledge integrated system for product design显示文摘 | Zhou Shouqin Chin Kwaisang Xie Youbai | 2003 | Computers in Industry2003，44，19： | 1 |
| 16 | Embedded knowledge service in mechanical product development 显示文摘 | Meng Xianghui Xie Youbai | 2011 | The International Journal of Advanced Manufacturing Technology2011，53，58： | 1 |
| 17 | Intemet-based distributive knowledge integrated system for product design 显示文摘 | Zhou Shouqin Chin Kwaisang Xie Youbai | 2003 | Computers in Industry2003，44，2： | 1 |
| 18 | Research on an on-line wear condition monitoring system for marine diesel engine 显示文摘 | YAN Liu ZHOU Liu XIE Youbai | 2000 | Tribology International2000，33，： | 1 |
| 19 | PERFORMANCE-BASED INTELLIGENT RESOURCE DESCRIPTION MODEL FOR INTERNET-BASED PRODUCT DESIGN显示文摘为基于因特网的合作设计的聪明的资源描述和多重聪明的资源集成上的问题被分析。为基于因特网的产品设计的一个基于表演的聪明的资源描述模型被建议,它能帮助创造,存储,操作并且交换为在基于因特网的产品设计的应用,工具和系统的聪明的资源描述信息。集成多重聪明的资源经由因特网完成一个复杂产品图案和分析的一个方法也被建议。为在突出的大学里与许多聪明的资源改进涡轮扩展的适用的系统设计的一个真实工程表现为案例研究。 | ZHU Aibin CHEN Wei XIE Youbai | 2006 | Chinese Journal of Mechanical Engineering2006，19，1： | 1 |
| 20 | Embedded knowledge service in me- chanical product development显示文摘 | Meng Xianghui Xie Youbai | 2011 | The International Journal of Ad- vanced Manufacturing Technology2011，53，58： | 1 |
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