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学者姓名：洪军
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Abstract ：
Due to the special structure of double-half inner rings, four-point contact ball bearings are prone to uneven forces in the inner raceway during movement, which affects the dynamic performance of the rolling element and cage, and even leads to cage sliding. Dynamic performance of the cage is an important factor affecting the working stability of bearings. In this paper, in order to grasp the operation law of the cage so as to guide the application of four-point contact ball bearings, the dynamic model of four-point contact ball bearings is established by the secondary development of Automatic Dynamic Analysis of Mechanical Systems (ADAMS). The dynamic performance of the cage is analyzed and evaluated with the indexes of vortex radius ratio and vortex velocity deviation ratio of the cage centroid trajectory. The results show the following: the cage stability increases and then decreases to a certain degree with rotating speed-rise; it increases and then decreases with the increase in the pure axial load; under a combination of axial and radial load, the cage moves more smoothly with smaller radial force. Rotating speed has little effect on cage stability, while radial force has a great influence on cage stability, followed by axial load. In order to verify the simulation results, a test bench for rolling bearing cages is developed, and the accuracy of the simulation results is verified by the test results.
Keyword ：
bearing dynamics cage motions experiment four-point contact ball bearing load distribution
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| GB/T 7714 | Li, Yeteng , Li, Wenchao , Zhu, Yongsheng et al. Dynamic Performance Analysis of Cage in Four-Point Contact Ball Bearing [J]. | LUBRICANTS , 2022 , 10 (7) . |
| MLA | Li, Yeteng et al. "Dynamic Performance Analysis of Cage in Four-Point Contact Ball Bearing" . | LUBRICANTS 10 . 7 (2022) . |
| APA | Li, Yeteng , Li, Wenchao , Zhu, Yongsheng , He, Gaobo , Ma, Shuaijun , Hong, Jun . Dynamic Performance Analysis of Cage in Four-Point Contact Ball Bearing . | LUBRICANTS , 2022 , 10 (7) . |
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Abstract ：
Cage stability directly affects the dynamic performance of rolling bearing, which, in turn, affects the operating state of rotating equipment. The random collision between the rolling elements and the cage pocket is the main reason for cage instability. In this paper, from the perspective of the relative sliding velocity between the rolling elements and the bearing raceway, the interactions of the rolling elements and the cage pockets were analyzed, and the four zones with different collision features were defined. On this basis, and on the basis of the bearing dynamics model, the interaction of two adjacent rolling elements and the cage pockets in the a'-b' area is discussed, and the peak impact force of the adjacent two balls and the cage pockets was investigated in terms of the rotation speed, radial load, acceleration/deceleration, and materials. When the ball runs close to the loaded zone, the probability of multiball random collision increases, which leads to an increase in the cage instability. At the entrance of the loaded zone, the peak impact force has the greatest impact on the cage stability during the acceleration process. Compared to the radial load applied to the bearing, the peak impact force is more sensitive to the bearing speed changes. The multiball collision analysis method provides a new idea for the research of cage stability.
Keyword ：
bearing dynamic model cage instability multiball random collision peak impact force
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| GB/T 7714 | Ma, Shuaijun , Zhang, Xiaohong , Yan, Ke et al. A Study on Bearing Dynamic Features under the Condition of Multiball-Cage Collision [J]. | LUBRICANTS , 2022 , 10 (1) . |
| MLA | Ma, Shuaijun et al. "A Study on Bearing Dynamic Features under the Condition of Multiball-Cage Collision" . | LUBRICANTS 10 . 1 (2022) . |
| APA | Ma, Shuaijun , Zhang, Xiaohong , Yan, Ke , Zhu, Yongsheng , Hong, Jun . A Study on Bearing Dynamic Features under the Condition of Multiball-Cage Collision . | LUBRICANTS , 2022 , 10 (1) . |
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Abstract ：
Precision contact probes have a huge demand in industrial manufacturing due to their high accuracy. However, the passive measurement mode of the existing probe easily causes wear of the probe ball and loss of accuracy during continuous contact scanning. In this paper, a PZT(piezoelectric actuators)-driven flexible probe is proposed with the dynamic time-domain function of the system response from low frequency to high drive frequency. The low-frequency measurement mode is established based on the linear response of the triangle wave. In order to avoid the trajectory nonlinearity of the stylus ball driven by PZT, the nonlinear mapping of the PZT hysteresis model is constructed by the BP neural network, and the linearly weighted particle swarm optimization (PSO) algorithm is used to realize the suppression of the response nonlinearity. Finally, the measurement experiment of the PZT-driven probe is conducted to reveal the measurement characteristics of low-frequency mode as well as measurement capability compared with commercial sensors.
Keyword ：
Force Force measurement Friction low-frequency mode nonlinear suppression Probes PZT-driven probe Resonant frequency trajectory nonlinearity Vibration measurement Vibrations
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| GB/T 7714 | Zheng, Weikang , Tian, Kai , Guo, Junkang et al. A Flexible Vibration Probe Based on PZT Low-Frequency Drive Mode [J]. | IEEE ACCESS , 2021 , 9 : 78823-78834 . |
| MLA | Zheng, Weikang et al. "A Flexible Vibration Probe Based on PZT Low-Frequency Drive Mode" . | IEEE ACCESS 9 (2021) : 78823-78834 . |
| APA | Zheng, Weikang , Tian, Kai , Guo, Junkang , Liu, Zhigang , Hong, Jun . A Flexible Vibration Probe Based on PZT Low-Frequency Drive Mode . | IEEE ACCESS , 2021 , 9 , 78823-78834 . |
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Abstract ：
All-inorganic cesium lead halide perovskite (CsPbBr3) quantum dots have shown great potential in the field of fluorescence temperature sensors due to their excellent optical properties. Focusing on the non-uniform fluorescence of CsPbBr3 quantum dots caused by uncontrollable in-situ crystallization strategy which is revolved around the temperature monitoring problem of bearing rotating components (bearing inner ring, bearing cage, et al) under high oil pollution and strong interference environment, a preparation-optimization method of CsPbBr3 quantum dots coated with polyvinylidene difluoride (PVDF), whose effectiveness is verified by means of microscopic morphology characterization, is proposed based on electrospinning technology and orthogonal experiment method, What's more, silicone resin (SR) coating process is used to improve the thermal stability of the perovskite quantum dot sensor. Finally, through temperature monitoring experiment of the bearing cage, it is demonstrated that the temperature monitoring performance of perovskite quantum dot sensor can be effectively enhanced by using electrospinning technology combined with SR coating process. © 2021 Journal of Mechanical Engineering.
Keyword ：
Bromine compounds Cesium compounds Coatings Electrospinning Fluorescence Lead compounds Nanocrystals Optical properties Perovskite Semiconductor quantum dots Silicones Thermodynamic stability
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| GB/T 7714 | Liang, Panting , Zhang, Pan , Yan, Ke et al. Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components [J]. | Journal of Mechanical Engineering , 2021 , 57 (14) : 188-194 . |
| MLA | Liang, Panting et al. "Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components" . | Journal of Mechanical Engineering 57 . 14 (2021) : 188-194 . |
| APA | Liang, Panting , Zhang, Pan , Yan, Ke , Hong, Jun , Zhu, Yongsheng . Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components . | Journal of Mechanical Engineering , 2021 , 57 (14) , 188-194 . |
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Abstract ：
The self-lubricating effect of the porous oil-containing cage is realized by storing and releasing lubricants through its internal micro-scale pore structure. The internal flow and heat transfer process in the micron-submicron pore structure is crucial to the self-lubricating mechanism of the porous oil-containing cage. To this end, a new modeling method of porous cage was proposed based on random seeds theory, and the local two-dimensional models of porous cage with different micro-scale pore structure were established. The multiphysics coupling simulation analysis of lubricating oil inside the porous cage with the effect of centrifugal force and thermal expansion was carried out based on the COMSOL Multiphysics platform. In order to characterize the micro-scale pore structure, new structural parameter indicators, such as relative surface perimeter, effective porosity, tortuosity and fluid properties related to the internal flow process, were all extracted from the above models. Combing with the Hagen-Poiseuille equation, a flow resistance model of oil flow inside the porous oil-containing cage was obtained. Finally, comparison of simulation results and analytical solutions of the micro-scale resistance model was carried out to verify the correctness of the micro-scale resistance model. The work provides a new direction for the study of the lubrication mechanism of the porous oil-containing cage.
Keyword ：
flow mechanism characterization micro-scale pores modeling micro-scale resistance model porous oil-containing cage rand seeds theory
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| GB/T 7714 | Yan, Ke , Yin, Tingting , Sun, Jiannan et al. Flow Mechanism Characterization of Porous Oil-Containing Material Base on Micro-Scale Pore Modeling [J]. | MATERIALS , 2021 , 14 (14) . |
| MLA | Yan, Ke et al. "Flow Mechanism Characterization of Porous Oil-Containing Material Base on Micro-Scale Pore Modeling" . | MATERIALS 14 . 14 (2021) . |
| APA | Yan, Ke , Yin, Tingting , Sun, Jiannan , Hong, Jun , Zhu, Yongsheng . Flow Mechanism Characterization of Porous Oil-Containing Material Base on Micro-Scale Pore Modeling . | MATERIALS , 2021 , 14 (14) . |
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Abstract ：
Purpose This paper aims to analyze the temperature field and the heat transfer performance of the counter rotating dual rotor bearings (CRDRB) based on the air phase flow field at different speeds to provide effective support for the lubrication and the thermal design of CRDRB. Design/methodology/approach In this study, taking H7006C angular contact ball bearing as an example, based on the flow visualization technique and the thermal analysis methods, the effects of outer ring speed on the air phase flow field, the temperature field and the heat transfer in bearing cavity were investigated. Findings Results indicated that there were more complex turbulent air vortices in CRDRB cavity. Turbulent cyclones in critical contact zone reduced the heat dissipation capacity of air. Compared with single rotor bearing with a static outer ring, the average heat transfer coefficient reduced by 11.78% and the average temperature raised by 3.06 K inside CRDRB cavity. Under the influence of outer ring rotation, the high temperature area in ball-inner raceway contact zone and pocket raised and reduced by 160.13% and 30.48%, respectively. The outer ring rotation had opposite effect on the heat dissipation of raceway contact zone and pocket. Originality/value The air phase flow field characteristics and the heat transfer performance of CRDRB were revealed and analyzed from the mechanism. An area quantification method was presented as an auxiliary mean of the thermal analysis to evaluate the heat transfer performance of bearing.
Keyword ：
Air phase flow characteristics Area quantification method Heat transfer performance High-speed ball bearing Temperature field
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| GB/T 7714 | Chen, Fei , Wang, Chao , Yan, Ke et al. Analysis of the heat transfer performance inside cavity of the counter rotating dual rotor bearing [J]. | INDUSTRIAL LUBRICATION AND TRIBOLOGY , 2021 , 73 (6) : 954-960 . |
| MLA | Chen, Fei et al. "Analysis of the heat transfer performance inside cavity of the counter rotating dual rotor bearing" . | INDUSTRIAL LUBRICATION AND TRIBOLOGY 73 . 6 (2021) : 954-960 . |
| APA | Chen, Fei , Wang, Chao , Yan, Ke , Ghouri, Muhammad Azeem , Zhu, Yongsheng , Hong, Jun . Analysis of the heat transfer performance inside cavity of the counter rotating dual rotor bearing . | INDUSTRIAL LUBRICATION AND TRIBOLOGY , 2021 , 73 (6) , 954-960 . |
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Abstract ：
Aiming at the problems of a complex structure or poor controllability of the existing bearing preload control devices, a method of self-regulation via a negative Poisson's ratio (NPR) spacer is proposed. Firstly, the principle of preload automatic adjustment at the bearing operation was introduced and the NPRs with three types of cell structures were analyzed. Furthermore, a thermo-mechanical coupling analysis model of the NPR spacer was established and the deformation and force output characteristics of the NPR spacer were studied and experimentally verified. It is found that the concave hexagonal cell structure has the optimal deformation characteristics for bearing preload adjustment. When the temperature is considered, the absolute value of Poisson's ratio of the NPR spacer decreases as the speed increases and the elongation of the NPR spacer and the output forces are much larger than those without temperature consideration. With the increase in temperature or rotating speed, the axial elongation and output forces of the NPR spacer increases while the effect of temperature is relatively larger.
Keyword ：
low-porosity structure negative Poisson's ratio-spacer rolling bearing self-regulation of preload thermo-mechanical coupling
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| GB/T 7714 | Yuan, Qianqian , Zhu, Yongsheng , Yan, Ke et al. Negative Poisson's Ratio-Spacer Design and Its Thermo-Mechanical Coupling Analysis Considering Specific Force Output [J]. | MATERIALS , 2021 , 14 (12) . |
| MLA | Yuan, Qianqian et al. "Negative Poisson's Ratio-Spacer Design and Its Thermo-Mechanical Coupling Analysis Considering Specific Force Output" . | MATERIALS 14 . 12 (2021) . |
| APA | Yuan, Qianqian , Zhu, Yongsheng , Yan, Ke , Cai, Yiqing , Hong, Jun . Negative Poisson's Ratio-Spacer Design and Its Thermo-Mechanical Coupling Analysis Considering Specific Force Output . | MATERIALS , 2021 , 14 (12) . |
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Abstract ：
This paper concerns the heuristic-based material stiffness optimization of frictional linear elastic contact problems for having control over the contact stress distribution, aiming to extend the material stiffness optimization to multiple loading conditions, in which each of the loadings acts solely on the structures. A decrease level of the variance of the contact stress is introduced and a weighted sum of the decrease levels under all load cases is constructed as the objective function. The individual criterion for contact problems with multiple contact regions is addressed. The worst case design is adopted for multiple load cases, and an extreme reference stress, which is the highest stress level of the subdomain under all load cases, is defined to control the Young's modulus modification process in a finite element framework. Through three numerical examples, it is demonstrated how an even distribution of the contact stress can be obtained for contact problems subjected to multiple load cases with single or multiple contact regions. Some new features of the material stiffness optimization with multiple loading conditions are also illustrated.
Keyword ：
Contact stress distribution Elastic contact Material stiffness optimization Multiple load cases s modulus Young’
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| GB/T 7714 | Zhou, Yicong , Lin, Qiyin , Yang, Xihao et al. Material stiffness optimization for contact stress distribution in frictional elastic contact problems with multiple load cases [J]. | INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN , 2021 , 17 (3) : 503-519 . |
| MLA | Zhou, Yicong et al. "Material stiffness optimization for contact stress distribution in frictional elastic contact problems with multiple load cases" . | INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN 17 . 3 (2021) : 503-519 . |
| APA | Zhou, Yicong , Lin, Qiyin , Yang, Xihao , Hong, Jun , Zhang, Ningjing , Zhao, Fu . Material stiffness optimization for contact stress distribution in frictional elastic contact problems with multiple load cases . | INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN , 2021 , 17 (3) , 503-519 . |
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Abstract ：
Aiming at the non-optimal performance of SFD under different operating conditions, this paper proposes a controllable clearance squeeze film damper (CCSFD) that uses hydraulic pressure to adjust the radial clearance and establishes a corresponding test rig. Measure the critical amplitude under different imbalances and hydraulic pressures. Give the calculation formula of hydrodynamic force by directly integrating pressure distribution and build the corresponding numerical model. Both experimental and numerical results show that CCSFD can achieve synchronous adjustment of the damper's performance under a non-stop state of the rotor system. In this case, the radial clearance can transform actively in the range of 1.75–3.19‰, which carries out a noticeable improvement of the damper's performance and achieves satisfactory performance under different operating conditions. © 2021
Keyword ：
Damping Hydraulic fluids Lubrication Rotating machinery Shock absorbers Structural design
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| GB/T 7714 | Zheng, Wenbin , Pei, Shiyuan , Zhang, Qingshan et al. Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude [J]. | Tribology International , 2021 , 166 . |
| MLA | Zheng, Wenbin et al. "Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude" . | Tribology International 166 (2021) . |
| APA | Zheng, Wenbin , Pei, Shiyuan , Zhang, Qingshan , Hong, Jun . Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude . | Tribology International , 2021 , 166 . |
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Abstract ：
In this paper, we present the multidisciplinary optimization of microchannel layout in a multipass heat sink by topology optimization. Unlike previous approaches that have focused on designing microchannels in laminar region, the current work focuses on manipulating fin geometries of heat sinks in turbulence region, which allows more complex and higher velocity flow and therefore results in better heat sink performance. To save the computational cost in topology optimization, a simplified Darcy-flow based model is utilized to cope with turbulence calculation, of which the permeability parameter is carefully calibrated in order to make the output physical fields ideally be close to those from full Navier Stokes-based model. As an iterative process, topology optimization gradually evolves channel layout from simple to complex. The selection of objective function and the setting of fluid volume constraints are studied in the optimization process. Besides the SIMP-based optimization, an integrated optimization strategy is developed, which comprises two different topology optimizers: a moving morphable components based optimizer (MMC) for the initial topology prediction and a density based optimizer (SIMP) for subsequent topology elaboration. Detailed 3D computational fluid dynamics (CFD) analysis is then implemented to examine the thermohydraulic characteristics of the optimized heat sinks and a specially designed experimental set up is built to validate the 3D simulation results. The numerical predictions about the trend of the pressure drop and unit thermal resistance change with the coolant inlet flow are in good agreement with the experimental results. Compared with SIMP-based optimization, the design based on hybrid optimization strategy has lower unit thermal resistance at the same inlet flow rate without large pressure drop increasing.
Keyword ：
Microchannel heat sink Multi-pass arrangement Thermal-fluid problem Topology optimization
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| GB/T 7714 | Li, B. T. , Xie, C. H. , Yin, X. X. et al. Multidisciplinary optimization of liquid cooled heat sinks with compound jet/channel structures arranged in a multipass configuration [J]. | APPLIED THERMAL ENGINEERING , 2021 , 195 . |
| MLA | Li, B. T. et al. "Multidisciplinary optimization of liquid cooled heat sinks with compound jet/channel structures arranged in a multipass configuration" . | APPLIED THERMAL ENGINEERING 195 (2021) . |
| APA | Li, B. T. , Xie, C. H. , Yin, X. X. , Lu, R. , Ma, Y. , Liu, H. L. et al. Multidisciplinary optimization of liquid cooled heat sinks with compound jet/channel structures arranged in a multipass configuration . | APPLIED THERMAL ENGINEERING , 2021 , 195 . |
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