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学者姓名：陈东菊
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Abstract ：
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.
Keyword ：
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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Abstract ：
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.
Keyword ：
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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Abstract ：
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.
Keyword ：
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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Abstract ：
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
Keyword ：
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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Abstract ：
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.
Keyword ：
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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Abstract ：
Intelligent additive manufacturing is the direction of development, and changing parameters during the manufacturing process is an effective measure to adjust the quality of the part. The purpose of this paper is to investigate the stability of single-track and multilayer fabricated Ti-6Al-4 V designed and fabricated by laser powder bed fusion with high degrees of freedom. The effects of single-track, relative density, surface quality, and microstructure and mechanical properties were investigated by designing a process strategy based on the interval powder layer thickness and regulating the process parameters. The survey shows that the point distance of less than 35 mu m, the exposure time of longer than 120 mu s, and the hatch spacing of greater than 70 mu m can ensure the relative density of specimens with high layer thickness. The microstructure consists mainly of acicular martensite a' filled in columnar ss grains, and acicular martensite a' grains are relatively sparse. The tensile strength, yield strength, and elongation of the specimens were 1109 MPa, 1053 MPa, and 5.6%, respectively. The fracture is a combination of ductile fracture and brittle fracture. The building rate was 9 mm(3)/ s, which is higher than the results obtained in previous studies. The survey can provide theoretical support for researchers and data support for engineers.
Keyword ：
Ti-6Al-4 V Ti-6Al-4 V Interval of the powder layer thickness Interval of the powder layer thickness Laser powder bed fusion Laser powder bed fusion Microstructure and mechanical properties Microstructure and mechanical properties Forming quality Forming quality
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| GB/T 7714 | Wang, Peng , Chen, Dongju , Tang, Yuhang et al. The effect of process parameters on the stability and efficiency in the laser powder bed fusion of Ti-6Al-4 V based on the interval powder layer thickness [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 127 (7-8) : 3537-3556 . |
| MLA | Wang, Peng et al. "The effect of process parameters on the stability and efficiency in the laser powder bed fusion of Ti-6Al-4 V based on the interval powder layer thickness" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 127 . 7-8 (2023) : 3537-3556 . |
| APA | Wang, Peng , Chen, Dongju , Tang, Yuhang , Fan, Jinwei , Li, Gang . The effect of process parameters on the stability and efficiency in the laser powder bed fusion of Ti-6Al-4 V based on the interval powder layer thickness . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 127 (7-8) , 3537-3556 . |
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Abstract ：
The lubricating medium of the aerostatic spindle is gas, with relatively low rigidity, which is easy to cause rotor offset and additional vibration under the action of external load, thus affecting the processing accuracy of the spindle. To solve the problem of unbalanced vibration of the spindle, a new type of controllable radial aerostatic bearing is designed by combining piezoelectric ceramics, which use the inverse piezoelectric effect of piezoelectric ceramics to squeeze the air film to produce corresponding control force, and the radial unbalanced vibration of the spindle is suppressed. A bearing-rotor-piezoelectric ceramic coupling model was established, and the control method of feedforward combined with feedback was used to reduce the hysteresis characteristics of piezoelectric ceramics. On this basis, the sliding mode controller of the entire system, and through research, it is found that the sliding mode controller based on the extended observer has the best vibration suppression effect compared with other sliding mode controllers in the article; this research results can improve the rotation accuracy of the spindle system and the machining accuracy of ultra-precision machine tools.
Keyword ：
unbalanced vibration unbalanced vibration piezoelectric ceramics piezoelectric ceramics sliding mode control sliding mode control aerostatic spindle aerostatic spindle vibration suppression vibration suppression
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| GB/T 7714 | Chen, Dongju , Zhang, Xuan , Wang, Handong et al. Unbalanced vibration suppressing for aerostatic spindle using sliding mode control method and piezoelectric ceramics [J]. | JOURNAL OF VIBRATION AND CONTROL , 2023 , 30 (11-12) : 2440-2453 . |
| MLA | Chen, Dongju et al. "Unbalanced vibration suppressing for aerostatic spindle using sliding mode control method and piezoelectric ceramics" . | JOURNAL OF VIBRATION AND CONTROL 30 . 11-12 (2023) : 2440-2453 . |
| APA | Chen, Dongju , Zhang, Xuan , Wang, Handong , Pan, Ri , Sun, Kun , Fan, Jinwei et al. Unbalanced vibration suppressing for aerostatic spindle using sliding mode control method and piezoelectric ceramics . | JOURNAL OF VIBRATION AND CONTROL , 2023 , 30 (11-12) , 2440-2453 . |
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Abstract ：
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.
Keyword ：
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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Abstract ：
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.
Keyword ：
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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Abstract ：
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.
Keyword ：
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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