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学者姓名：陈东菊
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摘要 ：
This work is focused on performance computation of high speed rotor bearing system with partial composite texture. Since its viscosity at varying speeds affects working performance in different partial composite texture, therefore at design and development stage, it is necessary to know the composite texture and thermal effect acting on rotor-bearing system that causes variation of performance. The effects of partial composite texture size and position on the performance of the bearing are studied. After the optimal structural parameters are determined, the effects of the partial composite texture and fluid thermos structure coupling on the bearing capacity, stiffness, and friction coefficient of the oil film are analysed. The results show that after considering the influence of thermal effect, the performance enhancement of composite texture bearing is better than that of smooth bearing. Considering the temperature effect, the bearing capacity of the composite textured bearing is increased by 51.4% compared with that of the smooth bearing, and the friction coefficient is reduced to 22.4%, which is better than the value without considering the temperature effect, the accuracy of the results is verified by experiments. This study provides a theoretical basis for the design of hydrostatic bearing and improving its performance.
关键词 ：
hydrostatic bearing hydrostatic bearing composite texture composite texture fluid thermos structure coupling fluid thermos structure coupling bearing performance bearing performance thermal effect thermal effect
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| GB/T 7714 | Chen, Dongju , Cui, Yu , Sun, Kun et al. Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing [J]. | LUBRICATION SCIENCE , 2024 , 36 (5) : 407-419 . |
| MLA | Chen, Dongju et al. "Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing" . | LUBRICATION SCIENCE 36 . 5 (2024) : 407-419 . |
| APA | Chen, Dongju , Cui, Yu , Sun, Kun , Fan, Jinwei , Cheng, Kai . Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing . | LUBRICATION SCIENCE , 2024 , 36 (5) , 407-419 . |
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摘要 ：
PurposeTo enhance the performance of hydrostatic bearings, graphene serves as a lubricant additive. Using the high thermal conductivity of graphene, the purpose of this study is to focus on the impact of graphene nano-lubricating oil hydrostatic bearing temperature rise at various speeds and eccentricities.Design/methodology/approachThe thermal conductivity of graphene nano-lubricating oil was calculated by molecular dynamics method and based on the viscosity-temperature effect, the coupled heat transfer finite element model of hydrostatic bearing was established; temperature rise of pure lubricating oil and graphene nano-lubricating oil hydrostatic bearing were analysed at different speed and eccentricity based on computational fluid dynamics method.FindingsWith the increase of speed and eccentricity, the temperature rise of 0.2% graphene nano-lubricating oil bearings is lower than that of pure lubricating oil bearings; in addition with the increase of graphene mass fraction, the temperature rise of graphene nano-lubricating oil bearings is always higher than that of pure lubricating oil bearings, and the higher the speed, the more obvious the phenomenon.Originality/valueThe effects of graphene as a lubricant additive on the thermal conductivity of nano-lubricating oil and the variation of the temperature rise of graphene nano-lubricating oil bearings compared to pure lubricating oil bearings were analysed by combining micro and macro methods.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0388
关键词 ：
Eccentricity Eccentricity Molecular dynamics method Molecular dynamics method Temperature rise Temperature rise Hydrostatic bearing Hydrostatic bearing Graphene nano-lubricating oil Graphene nano-lubricating oil
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| GB/T 7714 | Chen, Dongju , Zhao, Yupeng , Sun, Kun et al. Analysis of the impact of graphene nano-lubricating oil on thermal performance of hydrostatic bearing [J]. | INDUSTRIAL LUBRICATION AND TRIBOLOGY , 2024 , 76 (4) : 545-553 . |
| MLA | Chen, Dongju et al. "Analysis of the impact of graphene nano-lubricating oil on thermal performance of hydrostatic bearing" . | INDUSTRIAL LUBRICATION AND TRIBOLOGY 76 . 4 (2024) : 545-553 . |
| APA | Chen, Dongju , Zhao, Yupeng , Sun, Kun , Pan, Ri , Fan, Jinwei . Analysis of the impact of graphene nano-lubricating oil on thermal performance of hydrostatic bearing . | INDUSTRIAL LUBRICATION AND TRIBOLOGY , 2024 , 76 (4) , 545-553 . |
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摘要 ：
By studying the edge-workpiece engagement (EWE), and taking two inclination (lead and tilt) angles into account, the time-varying cutting areas and boundaries are determined, the instantaneous numerical chip thickness (NCT) within different EWEs at each point of the edge curve during the milling process of the ball end milling tool is solved, and the milling force and stability are calculated. The milling force and SLD of the model in this paper (NCT-EWE model) and the model in the literature (Altintas and Otzurk model) are compared. It is verified that the algorithm adopted in this paper has higher accuracy, and the algorithm is simple and fast. In addition, it is found that increasing the lead and tilt angles can reduce the milling force and improve the stability, and the free vibration in the stable region decreases gradually, while in the non-stable region, it increases. The algorithm in this paper has certain theoretical and application value for five-axis milling.
关键词 ：
SLD SLD Edge-workpiece engagement Edge-workpiece engagement Inclination angles Inclination angles Numerical chip thickness Numerical chip thickness Algorithm Algorithm
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| GB/T 7714 | Wu, Shuiyuan , Chen, Dongju , Fan, Jinwei et al. Ball-end milling stability and force analysis in the presence of inclination angles through a new algorithm with numerical chip thickness in edge-workpiece engagement [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 132 (9-10) : 4607-4624 . |
| MLA | Wu, Shuiyuan et al. "Ball-end milling stability and force analysis in the presence of inclination angles through a new algorithm with numerical chip thickness in edge-workpiece engagement" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 132 . 9-10 (2024) : 4607-4624 . |
| APA | Wu, Shuiyuan , Chen, Dongju , Fan, Jinwei , Tang, Yuhang . Ball-end milling stability and force analysis in the presence of inclination angles through a new algorithm with numerical chip thickness in edge-workpiece engagement . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 132 (9-10) , 4607-4624 . |
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摘要 ：
An acoustic signal acquisition experiment platform was constructed to gather the acoustic signals throughout the formation of 35 single-tracks of a 120 mm length copper-tin alloy in order to monitor and precisely manage the selective laser melting (SLM) forming process and enhance overall quality. The monitoring of the SLM forming process includes the analysis of the time and frequency domains, the extraction of the SLM process features using linear prediction techniques, and the development of support vector machine (SVM) model, back-propagation (BP) neural network models, and convolutional neural network models. The results show that the over-melted state can be identified by extracting time and frequency-domain features over a given range, but the normal and unmelted states are difficult to distinguish. The convolutional neural network model had a recognition rate of 99%, the BP neural network had an effective recognition rate of 90%, and the SVM model had a combined classification rate of 83.14% for the three states after optimization. In contrast, the convolutional neural network model performs best in monitoring and offers a framework and point of reference for acoustic signal analysis and online SLM quality monitoring.
关键词 ：
feature extraction feature extraction convolutional neural network convolutional neural network selective laser melting selective laser melting identifying the melting state identifying the melting state support vector machine support vector machine
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| GB/T 7714 | Chen, Dongju , Wang, Anqing , Wang, Peng et al. Research of melting state identification and process performance based on selective laser melting acoustic signals [J]. | JOURNAL OF LASER APPLICATIONS , 2024 , 36 (1) . |
| MLA | Chen, Dongju et al. "Research of melting state identification and process performance based on selective laser melting acoustic signals" . | JOURNAL OF LASER APPLICATIONS 36 . 1 (2024) . |
| APA | Chen, Dongju , Wang, Anqing , Wang, Peng , Li, Na . Research of melting state identification and process performance based on selective laser melting acoustic signals . | JOURNAL OF LASER APPLICATIONS , 2024 , 36 (1) . |
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摘要 ：
The aerostatic spindle often occur offset and additional vibration under the action of external load due to the low stiffness, thus affecting the rotary accuracy of the spindle. In order to solve the problem of unbalanced vibration of the spindle, a new type of controllable radial aerostatic bearing is designed by combining piezoelectric ceramics. A bearing-rotor-piezoelectric ceramic coupling model was established, and the control method of variable structure sliding mode control was used to reduce the vibration amplitude due to the unbalance. From the results of simulation and experiment, it is found that when the disturbance is taken as a constant value, the vibration amplitude increases with the increase of force; when the disturbance force is an unknown random force, the control effect is slightly worse than that when the disturbance force is known, but the rotary accuracy can be improved by this suppression effect on the aerostatic spindle. Finally, the correctness and effectiveness of this control method are proved through experiments.
关键词 ：
Vibration Vibration Vibration suppression Vibration suppression Piezoelectric ceramics Piezoelectric ceramics Aerostatic spindle Aerostatic spindle Variable structure sliding mode Variable structure sliding mode
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| GB/T 7714 | Chen, Dongju , Wang, Handong , Xie, Yinhui et al. Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2023 , 85 : 1-8 . |
| MLA | Chen, Dongju et al. "Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics" . | JOURNAL OF MANUFACTURING PROCESSES 85 (2023) : 1-8 . |
| APA | Chen, Dongju , Wang, Handong , Xie, Yinhui , Liang, Dong . Regulating the vibration of aerostatic journal spindle based on piezoelectric ceramics . | JOURNAL OF MANUFACTURING PROCESSES , 2023 , 85 , 1-8 . |
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摘要 ：
The microscopic molecular motion behavior between graphene and the liquid lubricant oil affects the rheological and frictional behavior of the nano-lubricant. However, the effect of graphene on the rheological behavior of industrial #3 lubricant oil has not been revealed. Thus, molecular dynamics (MD) and experimental study are used to investigate the effect of graphene concentration, size, temperature, and shear rate on the viscosity, mean square displacement (MSD), and density of graphene lubricant oil are investigated. The results show that the viscosity of GLO increases with the increase of graphene concentration and decreases with the increase of temperature (293 K-330 K). The MSD of graphene lubricant oil decreases with the increase of graphene size and increases with the increase of temperature. It is worth noting that graphene lubricant oil with 3G has the maximum value of MSD, which means the graphene has the best diffusion performance at this concentration. Compared to the base oil, the simulation and experiment viscosity values of the GOL with 3G increased by 22.9 % and 47.6 %, respectively. The GOL has the characteristics of a Newtonian fluid. This study can provide a reference for the application of graphene lubricant oil in industry.
关键词 ：
Viscosity Viscosity Molecular dynamics Molecular dynamics Mean square displacements Mean square displacements Graphene lubricant oil Graphene lubricant oil Rheological behavior Rheological behavior
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| GB/T 7714 | Li, Jia , Chen, Dongju , Sun, Kun et al. Molecular dynamics simulation and experimental study of the rheological performance of graphene lubricant oil [J]. | DIAMOND AND RELATED MATERIALS , 2023 , 141 . |
| MLA | Li, Jia et al. "Molecular dynamics simulation and experimental study of the rheological performance of graphene lubricant oil" . | DIAMOND AND RELATED MATERIALS 141 (2023) . |
| APA | Li, Jia , Chen, Dongju , Sun, Kun , Pan, Ri , Tang, Yuhang . Molecular dynamics simulation and experimental study of the rheological performance of graphene lubricant oil . | DIAMOND AND RELATED MATERIALS , 2023 , 141 . |
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摘要 ：
The hydrostatic spindle system is the main internal heat source of the machine tool, thus it is very significant to study the thermal behaviors of the hydrostatic spindle system. The purpose of this study is to investigate the effect of viscosity-temperature effect of lubricant on the temperature fields of hydrostatic bearing oil film and spindle thermal deformation. To study the effect of temperature rise of hydrostatic bearing oil film on the hydrostatic spindle and bearing bush, empirical equations, CFD, and experimental methods are used in this paper. Firstly, the temperature rise of hydrostatic bearing is obtained by the theoretical calculation method. Secondly, based on the CFD, the temperature field of lubricating oil film is compared and analyzed with consideration of viscous temperature effect and constant value of viscosity. Based on the fluid-thermal-solid coupling method, the thermal deformation of the spindle is analyzed. Finally, the experimental platform of the hydrostatic spindle is built and the accuracy of the simulation results was verified. The study shows that when the viscosity-temperature effect is considered, the values of oil film temperature rise and spindle thermal deformation are closer to the experimental values, and the error rates of bearing temperature and spindle thermal deformation are smaller than those when the viscosity is fixed.
关键词 ：
Viscosity-temperature effect Viscosity-temperature effect Hydrostatic bearing Hydrostatic bearing Fluid-thermal-solid coupling Fluid-thermal-solid coupling Thermal deformation Thermal deformation
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| GB/T 7714 | Chen, Dongju , Li, Jia , Tang, Yuhang et al. Comparison of experiments and simulations of thermal characteristics of a bearing-rotor system [J]. | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2023 , 45 (4) . |
| MLA | Chen, Dongju et al. "Comparison of experiments and simulations of thermal characteristics of a bearing-rotor system" . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 45 . 4 (2023) . |
| APA | Chen, Dongju , Li, Jia , Tang, Yuhang , Sun, Kun , Pan, Ri , Fan, Jinwei . Comparison of experiments and simulations of thermal characteristics of a bearing-rotor system . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2023 , 45 (4) . |
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摘要 ：
Since the rotational characteristics of the aerostatic spindle are formed by the coupling of the load bearing characteristics of the aerostatic bearing and the operating characteristics of the rotor, the imbalance factors of the spindle during the operation and manufacturing errors in processing have an impact on the performance of aerostatic bearings inevitably. Thus this paper analyzes the static and dynamic characteristics of aerostatic bearings under the influence of imbalance factors and manufacturing errors. With the established dynamic model of the aerostatic journal bearing, the rotational errors analysis of the aerostatic spindle is realized. The correctness of the simulation results is verified by comparing the experimental data with the simulation data. The data provides a theoretical basis to accurately predict the rotational errors of the spindle system and achieve accuracy control.
关键词 ：
Aerostatic journal bearing Aerostatic journal bearing Manufacturing errors Manufacturing errors Rotational accuracy Rotational accuracy Imbalance factors Imbalance factors Gas flow Gas flow
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| GB/T 7714 | Chen, Dongju , Li, Ping , Sun, Kun et al. Influence of Imbalance Factors Coupling with Manufacturing Error on the Rotational Accuracy of Aerostatic Spindle [J]. | INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING , 2023 , 24 (11) : 1933-1946 . |
| MLA | Chen, Dongju et al. "Influence of Imbalance Factors Coupling with Manufacturing Error on the Rotational Accuracy of Aerostatic Spindle" . | INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 24 . 11 (2023) : 1933-1946 . |
| APA | Chen, Dongju , Li, Ping , Sun, Kun , Pan, Ri , Tang, Yuhang . Influence of Imbalance Factors Coupling with Manufacturing Error on the Rotational Accuracy of Aerostatic Spindle . | INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING , 2023 , 24 (11) , 1933-1946 . |
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摘要 ：
Intelligent additive manufacturing is the future direction, and changing parameters during manufacturing process is an effective measure to adjust the quality of parts. In this study, the stability behavior of the manufacturing process under three process strategies, low layer thickness fabrication (LLTF), high layer thickness fabrication based on the interval of the powder layer thickness (IPLT), and changing of layer thickness strategy (CLTS), was comparatively investigated. Multilayer experiments and mechanical properties experiments were performed during laser powder bed fusion, and the correlation between manufacturing quality and powder layer thickness was compared. By optimizing the process parameters, the surface quality of CLTS is similar to that of LLTF, and the value of minimum surface roughness can be between 22 and 23 mu m. Only balling effect due to spattering and a small amount of porosity were found in the cross-section of CLTS. The relative density of most of the fabricated parts is higher than 99%, and the highest relative density is up to 99.99%. IPLT has longer and thicker martensite than LLTF, and the beta-grain of CLTS is also coarser than LLTF. The tensile properties of CLTS are similar to those of LLTF, and the ultimate tensile strength, yield strength and elongation of CLTS are 1205 MPa, 1107 MPa and 6.8%, respectively. Due to the anisotropy of the LPBF, the horizontally constructed Ti-6Al-4 V specimens yielded higher strengths, while the vertically constructed specimens obtained better elongation. The fracture of the part is characterized by a mixture of brittle fracture, ductile fracture and quasi-dissociative fracture. The surface quality, relative density and mechanical properties of CLTS are similar to those of LLTF, while the forming efficiency is much higher than that of LLTF, which can reach 7.35 mm(3)/s.
关键词 ：
Microstructure and mechanical properties Microstructure and mechanical properties Changing of layer thickness strategy Changing of layer thickness strategy Laser powder bed fusion Laser powder bed fusion Stability behavior Stability behavior Ti-6Al-4 V Ti-6Al-4 V
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| GB/T 7714 | Wang, Peng , Chen, Dongju , Fan, Jinwei et al. Study on the organization and properties of Ti-6Al-4 V fabricated by laser powder bed fusion based on the thickness of the gradient layer [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 126 (5-6) : 2249-2267 . |
| MLA | Wang, Peng et al. "Study on the organization and properties of Ti-6Al-4 V fabricated by laser powder bed fusion based on the thickness of the gradient layer" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 126 . 5-6 (2023) : 2249-2267 . |
| APA | Wang, Peng , Chen, Dongju , Fan, Jinwei , Li, Gang . Study on the organization and properties of Ti-6Al-4 V fabricated by laser powder bed fusion based on the thickness of the gradient layer . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 126 (5-6) , 2249-2267 . |
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摘要 ：
The study of molten pool characteristics is a powerful means of determining the quality of laser additive manufacturing forming. In this paper, a three-dimensional transient thermal flow field numerical model of Ti6Al4V powder processed by LPBF is developed based on FLOW-3D soft-ware, and the dynamic evolution of the molten pool with fixed process parameters is quantita-tively described using dimensionless numbers in computational fluid dynamics. It is shown that the main heat transfer mode of the molten pool is thermal convection; the evaporative back sitting pressure, surface tension and Marangoni shear force are the main driving forces for the evolution of the molten pool. Furthermore, the influence of key process parameters on the heat flow field of the molten pool was analyzed. When the laser power was 300 W, the depression depth and molten pool depth caused by the recoil pressure were significantly larger, and the isothermal density of the solidification region was more intensive; when the scanning speed was increased from 0.4 m/s to 0.8 m/s, the molten pool length was reduced from 524 & mu;m to 410 & mu;m, and the line energy density was reduced making the amount of melted powder decrease. The wettability and fluidity of the molten state metal becomes worse; when the scanning interval increases to 120 & mu;m, a large number of incompletely melted powder tracks cannot lap correctly at the midline of the double track. The results of the above simulations achieve a high degree of agreement with the surface quality of the specimens during the experiments, which provides guidance for quantitative analysis of molten pool evolution and prediction of Ti6Al4V forming quality.
关键词 ：
Thermal flow field Thermal flow field process Parameters process Parameters Laser powder bed fusion Laser powder bed fusion Molten pool Molten pool Additive manufacturing Additive manufacturing
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| GB/T 7714 | Chen, Dongju , Li, Gang , Wang, Peng et al. Numerical simulation of melt pool size and flow evolution for laser powder bed fusion of powder grade Ti6Al4V [J]. | FINITE ELEMENTS IN ANALYSIS AND DESIGN , 2023 , 223 . |
| MLA | Chen, Dongju et al. "Numerical simulation of melt pool size and flow evolution for laser powder bed fusion of powder grade Ti6Al4V" . | FINITE ELEMENTS IN ANALYSIS AND DESIGN 223 (2023) . |
| APA | Chen, Dongju , Li, Gang , Wang, Peng , Zeng, Zhiqiang , Tang, Yuhang . Numerical simulation of melt pool size and flow evolution for laser powder bed fusion of powder grade Ti6Al4V . | FINITE ELEMENTS IN ANALYSIS AND DESIGN , 2023 , 223 . |
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