Journal of Tribology-transactions of The Asme最新文献_第10页

Point Contact Thermal Mixed-EHL under Short Period Intermittent Motion 短周期间歇运动下的点接触热混合EHL

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4062098

Mingyu Zhang, Ming Yao, Jing Wang, Yong Wan

引用次数: 1

Influence of free water droplets on film formation under point contact grease lubrication 点接触油脂润滑下自由水滴对成膜的影响

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-02-20 DOI: 10.1115/1.4056944

Yiming Han, P. Sperka, Jing Wang, I. Křupka, M. Hartl, Weimin Li, X. B. Wang, Weimin Liu

{"title":"Influence of free water droplets on film formation under point contact grease lubrication","authors":"Yiming Han, P. Sperka, Jing Wang, I. Křupka, M. Hartl, Weimin Li, X. B. Wang, Weimin Liu","doi":"10.1115/1.4056944","DOIUrl":"https://doi.org/10.1115/1.4056944","url":null,"abstract":"\u0000 The influence of the grease-water two-phase emulsion on the bearing track on the film formation has been studied by carrying out optical interferometry experiments on a ball disk test rig to observe the dynamic film-forming behavior of lubricating grease under steady-state and micro-oscillation conditions. It is found that free water cause a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil band on both sides of the oil reservoir. The experiment determines that the state of the phase before entering the elastohydrodynamic lubrication (EHL) contact is water-in-oil. For the reciprocating motion and oscillation, the effects of the amount of free water and the length of the motion stroke are discussed in detail. It is found that for reciprocating movements with long stroke lengths, the effect of free water is summarized to enhance the fluidity of the fibrous mass of the grease thickener in the first few cycles of the movement. For shorter stroke lengths, the effect of free water is a scouring effect on the contact zone grease after 100 cycles. This paper provides new insights into the effects that causes water pollution to the point contact lubrication during the transformation from reciprocating motion to fretting.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47728387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tribological evaluation of few-layer nitrogen-doped graphene as an efficient lubricant additive on engine cylinder liner: Experiment and mechanism investigation 少量氮掺杂石墨烯作为发动机缸套润滑添加剂的摩擦学评价:实验与机理研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-02-14 DOI: 10.1115/1.4056905

Wenwu Lei, Wentao Tang, Xiaoyu Mo, Z. Tian, Peikang Shen, T. Ouyang

{"title":"Tribological evaluation of few-layer nitrogen-doped graphene as an efficient lubricant additive on engine cylinder liner: Experiment and mechanism investigation","authors":"Wenwu Lei, Wentao Tang, Xiaoyu Mo, Z. Tian, Peikang Shen, T. Ouyang","doi":"10.1115/1.4056905","DOIUrl":"https://doi.org/10.1115/1.4056905","url":null,"abstract":"\u0000 The restricted adsorption capacity of ordinary graphene at high temperature limits its application in engine lubrication. To address this, nitrogen-doped element-modified graphene with strong adsorption and superior lubricating properties is prepared by a bottom-up chemical strategy in this study. The reciprocating tribometer is aimed at simulating the piston operating environment to determine the lubrication performance of nitrogen-doped graphene. The characterization and analysis for the wear marks are performed by means of depth-of-field microscope, scanning electron microscope, energy dispersive spectrometer and other instruments. The experimental data demonstrates that the friction-reduction and anti-wear properties of PAO 6 base oil are enhanced by 22.4% and 56.9% (100 °C), respectively, after the addition of 0.4 wt% nitrogen-doped graphene. Besides, the abrasive and adhesive wear are significantly reduced, which is attributed to its inter-layer slip along the sliding direction and superior adsorption performance. Finally, the interfacial lubrication mechanism of lubricant protective film under high temperature conditions is revealed.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48166208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Investigations of the Bump Foil Bearing with Thick Top Foil Based on Contact Mechanics 基于接触力学的厚顶箔碰撞箔轴承研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-02-10 DOI: 10.1115/1.4056900

Jie Li, Changlin Li, Jia-min Du

引用次数: 2

A Novel Incipient Fault Detection Technique for Roller Bearing Using Deep Independent Component Analysis and Variational Modal Decomposition 基于深度独立分量分析和变分模态分解的滚动轴承早期故障检测技术

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-02-10 DOI: 10.1115/1.4056899

V. G. Salunkhe, R. Desavale, S. Khot, Nitesh P. Yelve

{"title":"A Novel Incipient Fault Detection Technique for Roller Bearing Using Deep Independent Component Analysis and Variational Modal Decomposition","authors":"V. G. Salunkhe, R. Desavale, S. Khot, Nitesh P. Yelve","doi":"10.1115/1.4056899","DOIUrl":"https://doi.org/10.1115/1.4056899","url":null,"abstract":"\u0000 Roller bearing failure can result in downtime or the entire outage of rotating machinery. As a result, a timely incipient bearing defect must be diagnosed to ensure optimal process operation. Modern condition monitoring necessitates the use of Deep Independent Component Analysis to diagnose incipient bearing failure. This paper presents a Deep Independent Component Analysis method based on variational Modal Decomposition (VMD-ICA) is to diagnose incipient bearing defect. On a newly established test setup for rotor bearings, Fast Fourier Techniques are used to extract the vibration responses of bearings that have been artificially damaged using Electro-chemical Machining. VMD techniques diminish the noise of the measurement data, to decompose data processed into multiple sub-data sets for extracting incipient defect characteristics. The simplicity of the VMD-ICA model enriched the precision of diagnosis correlated to the experimental results with weak fault characteristic signal and noise interference. Moreover, Deep VMD-ICA has additionally demonstrated strong performance in comparison to experimental results and is useful for monitoring the condition of industrial machinery.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44793020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Simplified calculation of recess pressure considering the hydrodynamic effect 考虑水动力效应的隐缝压力简化计算

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-01-23 DOI: 10.1115/1.4056740

Jiawei Wang, Sen Jiang, Jiuqi Huang, Wencai Xiong, Jingwei Hu, Zhaozhe Meng, Ange Nsilani Kouediatouka, G. Dong

引用次数: 2

Investigation of Roller Bearing Cage Pocket Lubrication and Friction 滚子轴承保持架腔润滑与摩擦研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-01-11 DOI: 10.1115/1.4056649

Wyatt L Peterson, F. Sadeghi, A. Meinel, H. Grillenberger

{"title":"Investigation of Roller Bearing Cage Pocket Lubrication and Friction","authors":"Wyatt L Peterson, F. Sadeghi, A. Meinel, H. Grillenberger","doi":"10.1115/1.4056649","DOIUrl":"https://doi.org/10.1115/1.4056649","url":null,"abstract":"\u0000 A test rig was designed and developed to assess the lubrication and friction of a single cylindrical roller and a conformal cage pocket. The roller was lubricated via oil bath in a sealed housing. Inner and outer bearing raceway pieces were fixed above and below the roller to mimic the internal geometry of an actual bearing. The cage pocket was made from transparent acrylic to look inside the cage and observe oil flow during operation. A six-axis load cell was used to measure the torque generated by the entire test rig with and without the cage pocket, and used to isolate the friction of the cage pocket. Experiments were conducted to investigate the effects of roller-pocket clearance, roller-race clearance, and roller oil submersion level at rest. Results suggest that roller bearing cage pocket friction increases with decreasing pocket clearance, increasing oil availability, and increasing operating speed. The oil was observed to coalesce into stable striations inside the cage pocket for many operating conditions. Striation width was observed to decrease with increasing speed, increasing pocket clearance, and decreasing oil availability. The striations were summarized by oil volume fraction inside the cage pocket, which decreased with increasing speed, decreasing pocket clearance and decreasing oil availability. The current results provide new information about oil behavior inside roller bearing cage pockets during operation, and an approach is presented to estimate roller bearing cage pocket friction.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46129665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

On the Lubrication and Stability Behaviors of a Conical Hybrid Floating Ring Bearing with Thermal Effects 考虑热效应的锥形混合式浮环轴承润滑与稳定性研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056631

Shuai Yang, Jiang Xueqing, S. Zhang, Hong Guo, S. Cen

{"title":"On the Lubrication and Stability Behaviors of a Conical Hybrid Floating Ring Bearing with Thermal Effects","authors":"Shuai Yang, Jiang Xueqing, S. Zhang, Hong Guo, S. Cen","doi":"10.1115/1.4056631","DOIUrl":"https://doi.org/10.1115/1.4056631","url":null,"abstract":"\u0000 The conical bearing can withstand both journal and axial load because of the conical-shape fluid film, and an investigation concerning the thermodynamic lubrication and stability properties is proposed for a conical hydrostatic/hydrodynamic floating ring bearing theoretically and experimentally. The finite element method is coupled with the finite difference method to solve the variable-viscosity Reynolds equations, thermal energy equations, and the corresponding boundary conditions for the inner and outer films in a floating ring equilibrium state, and the conical bearing-rotor dynamic and stability performance models are built up with the perturbation theory and Routh-Hurwitz method. The primary characteristics parameters that are obtained under different operational conditions suggested that there presents a significant temperature gradient distribution over the lubricated domain, the thermal effects decrease the load carrying capacity, friction power loss, and stiffness and damping coefficients, and the viscous dissipation influences the variation of threshold instability speed with eccentricity and reduces its maximum value. In experiments, the temperature distributions of the oil leakage flow are measured to compare with the calculated results for the validation of the mathematic model using an infrared thermal imager, and the thermal effects need to be taken into consideration for the bearing lubrication analysis and design.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48810241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Influence of Real Lubricant Density-Pressure Behavior on the Dynamic Response of Elastohydrodynamic Lubricated Conjunctions 实际润滑油密度-压力特性对弹流润滑连接件动态响应的影响

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056629

J. Issa, W. Habchi

{"title":"Influence of Real Lubricant Density-Pressure Behavior on the Dynamic Response of Elastohydrodynamic Lubricated Conjunctions","authors":"J. Issa, W. Habchi","doi":"10.1115/1.4056629","DOIUrl":"https://doi.org/10.1115/1.4056629","url":null,"abstract":"\u0000 The current work investigates the influence of real lubricant density-pressure behavior on the dynamic response of elastohydrodynamic lubricated conjunctions. Such a response is often based on a non-realistic universal equation of state, despite longstanding evidence of its lack of support by measurements. A finite element framework is employed to investigate the damping and stiffness characteristics of line contact EHD lubricating films, subject to a harmonic loading. Both the equivalent stiffness and damping coefficients of lubricating films are found to increase with the base applied external load, and its amplitude of oscillation. They decrease however with increasing mean entrainment speed and load oscillation frequency. That is, they both increase as lubricant films get thinner. By comparison with the real density-pressure response of a highly compressible silicon oil, the universal equation of state is shown to underestimate the lubricant film's stiffness and damping characteristics. The relative deviations in equivalent damping and stiffness coefficients can reach up to about 12% and 25%, respectively. Therefore, realistic lubricant characteristics should always be considered. In particular, the use of the universal equation of state should not be taken for granted, as is customary in the EHL literature. Lubricant density-pressure response is not of a secondary nature, when it comes to predicting the dynamic performance characteristics of EHL conjunctions.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43329162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of electric current and graphite content on the wear behaviors of copper/graphite composites 电流和石墨含量对铜/石墨复合材料磨损行为的影响

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056630

Rui Zhu, Xue Zuo, Yuankai Zhou, Wenxin Xie

引用次数: 0