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| 1 | Low stress no distortion welding for aerospace shell structures显示文摘LowstressnodistortionweldingforaerospaceshellstructuresGUANQiao;GUODelunandZHANGChongxian(BeijingAeronauticalManufacturingTec... | GUAN Qiao GUO Delun and ZHANG Chongxian(Beijing Aeronautical Manufacturing Technology Research Institue. P.O Box 304. Beijing.100024) | 1996 | China Welding1996，5，1： | 3 |
| 2 | Configuration Selection for Reconfigurable Manufacturing Systems by Means of Characteristic State Space显示文摘The configuration selection for reconfigurable manufacturing systems(RMS) have been tackled in a number of studies by using analytical or simulation models. The simulation models are usually based on fewer assumptions than the analytical models and therefore are more wildly used in modeling complex RMS. But in the absence of an efficient gradient analysis method of the objective function, it is time-consuming in solving large-scale problems by using a simulation model coupled with a meta-heuristics algorithm. In this paper, a new approach by means of characteristic state space is presented to improve the efficiency of the configuration selection for an RMS. First, a characteristic state equation is set up to represent the input and the output resources of each basic activity in an RMS. A production process model in terms of matrix equations is established by iterating the equations of basic activities according to the resource flows. This model introduces the production process into a characteristic state space for further analysis. Second, the properties of the characteristic state space are presented. On the basis of these properties, the configuration selection in an RMS is considered as a path-planning problem, and the gradient of the objective function is computed. Modified simulated annealing(SA) is also presented, in which neighborhood generation is guided by the gradient to accelerate convergence and reduce the run time of the optimization procedure. Finally, several case studies on the configuration selection for some actual reconfigurable assembly job-shops are presented and compared to the classical SA. The comparison shows relatively positive results. This study provides a more efficient configuration selection approach by using the gradient of the objective function and presents the relevant theories on which it is based. | HUANG Liang GAO Yuan QIAN Feng TANG Suzhou WANG Delun | 2011 | Chinese Journal of Mechanical Engineering2011，24，1： | 2 |
| 3 | Correlation between antioxidant depletion kinetic model and ageing behaviour of cross-linked polyethylene cable insulation显示文摘A concise kinetic model catering for the antioxidant reaction of thermally aged crosslinked polyethylene(XLPE)cable insulation before its abrupt performance deterioration is proposed for life prediction and condition assessment.The alternating current breakdown strength,elongation at break,carbonyl index,and pyrolysis activation energy of XLPE insulation are found to consistently display an abrupt change at a certain point of ageing time.This is strongly correlated to the depletion of the antioxidant whose content gradually decreases with ageing time and drops to a critical value,after which the abrupt degradation of the above macroscopic performances happens.Based on the simplified chain reactions of XLPE during thermal-oxidative ageing,a concise kinetic model about antioxidant prediction is accordingly established by solving the chemical kinetics equations.It indicates that the antioxidant content decays with the reciprocal of time before the abrupt degradation occurs.Results of antioxidant content predicted by the kinetic model at different temperatures matches well with the experimental results,and its reliability can also be proved by the Arrhenius relationship of the obtained results.The kinetic model proposed herein demonstrates satisfying conciseness and thus can be highly feasible in ageing condition assessment and life predicting of XLPE insulation. | Yingying Zheng Yiwei Long Delun Yi Haoran Zhang Jian Gao Kangning Wu Jianying Li | 2023 | High Voltage2023，8，2： | 2 |
| 4 | Calculation of Significant Wave Height Using the Linear Mean Square Estimation Method显示文摘Significant wave height is an important criterion in designing coastal and offshore structures.Based on the orthogonality principle, the linear mean square estimation method is applied to calculate significant wave height in this paper.Twenty-eight-year time series of wave data collected from three ocean buoys near San Francisco along the California coast are analyzed.It is proved theoretically that the computation error will be reduced by using as many measured data as possible for the calculation of significant wave height.Measured significant wave height at one buoy location is compared with the calculated value based on the data from two other adjacent buoys.The results indicate that the linear mean square estimation method can be well applied to the calculation and prediction of significant wave height in coastal regions. | GAO Yangyang YU Dingyong LI Cuilin XU Delun | 2010 | Journal of Ocean University of China2010，9，4： | 2 |
| 5 | Safety and Efficacy of Conbercept in Neovascular Age-Related Macular Degeneration Results from a 12-month Randomized Phase II Study: AURORA Study显示文摘 | Xiaoxin Li Gezhi Xu Yusheng Wang Xun Xu Xiaoling Liu Shibo Tang Feng Zhang Junjun Zhang Luosheng Tang Quan Wu Delun Luo Xiao Ke | 2014 | Ophthalmology2014，，： | 2 |
| 6 | Pre-deformation for Assembly Performance of Machine Centers显示文摘The current research of machine center accuracy in workspace mainly focuses on the poor geometric error subjected to thermal and gravity load while in operation,however,there are little researches focusing on the effect of machine center elastic deformations on workspace volume.Therefore,a method called pre-deformation for assembly performance is presented.This method is technically based on the characteristics of machine tool assembly and collaborative computer-aided engineering(CAE)analysis.The research goal is to enhance assembly performance,including straightness,positioning,and angular errors,to realize the precision of the machine tool design.A vertical machine center is taken as an example to illustrate the proposed method.The concept of travel error is defined to obtain the law of the guide surface.The machine center assembly performance is analyzed under cold condition and thermal balance condition to establish the function of pre-deformation.Then,the guide surface in normal direction is processed with the pre-deformation function,and the machine tool assembly performance is measured using a laser interferometer.The measuring results show that the straightness deviation of the Z component in the Y-direction is 158.9%of the allowable value primarily because of the gravity of the spindle head,and the straightness of the X and Y components is minimal.When the machine tool is processed in pre-deformation,the straightness of the Z axis moving component is reduced to 91.2%.This research proposes a pre-deformation machine center assembly method which has sufficient capacity to improving assembly accuracy of machine centers. | SUN Yongping WANG Delun DONG Huimin XUE Runiu YU Shudong | 2014 | Chinese Journal of Mechanical Engineering2014，27，3： | 2 |
| 7 | Preparation and Catalytic Activity of P4VP-Cu(Ⅱ)Complex Supported on Silica Gel显示文摘 | Gao Baojiao Kong Delun Zhang Yan | 2008 | J Mol Catal A:Chem2008，286，12： | 1 |
| 8 | Kinematic Geometry for the Saddle Line Fitting of Planar Discrete Positions显示文摘The position synthesis of planar linkages is to locate the center point of the moving joint on a rigid link, whose trajectory is a circle or a straight line. Utilizing the min-max optimization scheme, the fitting curve needs to minimize the maximum fitting error to acquire the dimension of a planar binary P-R link. Based on the saddle point programming, the fitting straight line is determined to the planar discrete point-path traced by the point of the rigid body in planar motion. The property and evolution of the defined saddle line error can be revealed from three given separate points. A quartic algebraic equation relating the fitting error and the coordinates is derived, which agrees with the classical theory. The effect of the fourth point is discussed in three cases through the constraint equations. The multi-position saddle line error is obtained by combination and comparison from the saddle point programming. Several examples are presented to illustrate the solution process for the saddle line error of the moving plane. The saddle line error surface and the contour map presented to show the variations of the fitting error in the fixed frame. The discrete kinematic geometry is then set up to disclose the relations of the separate positions of the rigid body, the location of the tracing point on the moving body, and the position and orientation of the saddle line to the point-path. This paper presents a new analytic geometry method for saddle line fitting and provides a theoretical foundation for position synthesis. | WU Yu WANG Delun WANG Wei YU Shudong XU Wenji | 2015 | Chinese Journal of Mechanical Engineering2015，28，4： | 1 |
| 9 | Preparation,structural characterization and bioactivities of polysaccharides from mulberry(Mori Fructus)显示文摘Mulberry(Mori Fructus),a highly promising functional food,has long exhibited multiple therapeutic effects as a tonic in traditional Chinese food and pharmacology.Polysaccharides have been regarded as the pivotal pharmacological ingredient in mulberry.In this study,structural characterization and bioactivities of polysaccharides from mulberry(PFM-3)were determined.The results showed that PFM-3 was a pyranose containing carboxyl group,which was mainly composed of glucose(Glc)and a small amount of mannose(Man)and fucose(Fuc).The molecular weight of PFM-3 was 96.17 kDa,and the surface of PFM-3 was compact and uniform crack.PFM-3 markedly decreased lipid accumulation,triglyceride(TG)and low density lipoprotein cholesterin(LDL-C)on hyperlipidemia human hepatocellular carcinoma(HepG2)cells.PFM-3 recovered nuclear morphometry and mitochondrial membrane potential(MMP),enhanced the activity of glutathione peroxidase(GPx)and decreased cell arrest in G2 phase on oxidative stress HepG2 cells.In addition,PFM-3 promoted the decline of tumor necrosis factor-α(TNF-α)and the augment of interleukin-10(IL-10)secretion on inflammatory mouse leukemia cells of monocyte macrophage(RAW 264.7).This work provides a certificate that PFM-3 could markedly improve cellular lipid accumulation,endogenous antioxidant defense capacity and inflammation levels to further use for treatment and amelioration of related diseases. | Yumeng Liu Yiming Liu Delun Mu Hui Yang Ying Feng Ruiqin Ji Rina Wu Junrui Wu | 2022 | Food Bioscience2022，46，2： | 1 |
| 10 | Biological modeling and evolution based synthesis of metamorphic mechanisms显示文摘 | ZHANG Liping WANG Delun DAI J S | 2008 | ASME Transaction Journal of Mechanical Design2008，130，07： | 1 |
| 11 | Studies on rheological behav- iour of hydrophobically associating polyacrylamide with strong positive salinity sensitivity显示文摘 | Baojiao Gao Liding Jiang Delun Kong | 2007 | Colloid Polym Sei2007，285，： | 1 |
| 12 | Orientation and workspace analysis of the multifingered metamorphic hand-metahand显示文摘 | DAI J S WANG Delun CUI Lei | 2009 | IEEE Transactions on Robotics2009，25，4： | 1 |
| 13 | Kinematic effect of the compliant cup in harmonic drives显示文摘 | Dong Huiming Wang Delun Ting Kwun L | 2011 | Jour- nal of Mechanical Design2011，133，05： | 1 |
| 14 | Finite-element modeling of the failure of interference-fit planet carrier and shaft as- sembly 显示文摘 | Hao Dongsheng Wang Delun | 2013 | Engineering Failure Analysis2013，33，7： | 1 |
| 15 | A unified curvature theory in kinematic geometry of mechanism显示文摘 | Wang Delun Liu Jian Xiao Dazhun | 1998 | Science in China1998，41，2： | 1 |
| 16 | Studies on rheological behaviour of hydrophobically associating polyacrylamide with strong positive salinity sensitiv-ity显示文摘 | Gao Baojiao Jiang Liding Kong Delun | 2007 | Colloid and Polymer Science2007，285，8： | 1 |
| 17 | Beta Distribution of Surface Elevation of Random Waves显示文摘A probability density function (PDF) is derived of beta distribution with both λ3 (skewness) and λ4 (kurtosis) as parameters for weakly nonlinear wave surface elevation by use of a method recently proposed by Srokosz. This PDF not only has a simpler form than the well-known Gram-Charlier Series PDF derived by Longuet-Higgins, but also overcomes an obvious shortcoming of the latter that when the series is unsuitably truncated, the resulting PDF is locally negative. To test the derived beta PDF, laboratorial experiments of wind waves are conducted. The experimental data indicate that the theoretical requirements of the parameters in the beta PDF are fulfilled. The experimental results show that the present PDF is in better agreement with the measured data than the beta PDF only including parameter λ3, and also than the Gram-Charlier Series PDF truncated up to the term of H6. | ZHANG Jun(张军) XU Delun(徐德伦) | 2001 | China Ocean Engineering2001，16，1： | 1 |
| 18 | Kinematic Fundamentals of Planar Harmonic Drives显示文摘 | Dong Huimin Ting Kwunlon Wang Delun | 2011 | Journal of Mechanical Design2011，133，1： | 1 |
| 19 | Kinematic Effect of the Compliant Cup in Harmonic Drives显示文摘 | Dong Huimin Ting Kwunlon Wang Delun | 2011 | Journal of Mechanical Design2011，133，1： | 1 |
| 20 | A unified curvature theory in kinematic geometry ofmechanism显示文摘 | WANG Delun LIU Jian XIAO Dazhun | 1998 | Science in China(Series E)1998，41，2： | 1 |
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