Yu Hou, Xi Wang, Bihe Xu, Yangli-ao Geng, Qingyong Li, Di Yang
Accurate prediction of the frictional moment of the bearing contributes to the correct determination of the power loss in drivetrains and the antifriction design of bearings. This paper investigates a method for accurately predicting the frictional moment of the cylindrical roller bearing (CRB) under a wide range of operating conditions. The complex relationship between the bearing frictional moment and multiple operating parameters such as the shaft speed, roller-raceway contact load, cage slip ratio and lubricating property is established using an experimental data driven artificial neural network (ANN) model. To provide actual data for training and testing the ANN model, the frictional moment and multiple operating parameters of the test CRB are synchronously measured under many test conditions. Compared with the prediction results from conventional physical models, the experimental data driven ANN model reveals a higher prediction performance of the frictional moment.
{"title":"Prediction of Frictional Moment of Cylindrical Roller Bearing Using Experimental Data Driven Artificial Neural Networks","authors":"Yu Hou, Xi Wang, Bihe Xu, Yangli-ao Geng, Qingyong Li, Di Yang","doi":"10.1115/1.4062367","DOIUrl":"https://doi.org/10.1115/1.4062367","url":null,"abstract":"\u0000 Accurate prediction of the frictional moment of the bearing contributes to the correct determination of the power loss in drivetrains and the antifriction design of bearings. This paper investigates a method for accurately predicting the frictional moment of the cylindrical roller bearing (CRB) under a wide range of operating conditions. The complex relationship between the bearing frictional moment and multiple operating parameters such as the shaft speed, roller-raceway contact load, cage slip ratio and lubricating property is established using an experimental data driven artificial neural network (ANN) model. To provide actual data for training and testing the ANN model, the frictional moment and multiple operating parameters of the test CRB are synchronously measured under many test conditions. Compared with the prediction results from conventional physical models, the experimental data driven ANN model reveals a higher prediction performance of the frictional moment.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49162379","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}
This paper presents a novel windage power loss (WPL) measurement method for the meshing herringbone gear pair. Firstly, the WPL test rig of herringbone gear pair is put up, and then the measurement sequence of WPL is described; Secondly, the WPL of different gear pairs is tested and the influence of operation speed, design parameters on the WPL of meshing gear pairs is studied. Finally, the WPL simulation analysis of meshing gear pair is carried out. The generation mechanism of WPL is analyzed and the WPL of each meshing gear pair at different rotational speeds is obtained, which verifies the accuracy of the presented WPL measurement method. The research on the measurement method of WPL can provide support for the optimization design of the high-speed gear pair.
{"title":"Experimental and simulation analysis on windage power loss of herringbone gear pair","authors":"Jin Yang, Tengjiao Lin, L. Jiang","doi":"10.1115/1.4062365","DOIUrl":"https://doi.org/10.1115/1.4062365","url":null,"abstract":"\u0000 This paper presents a novel windage power loss (WPL) measurement method for the meshing herringbone gear pair. Firstly, the WPL test rig of herringbone gear pair is put up, and then the measurement sequence of WPL is described; Secondly, the WPL of different gear pairs is tested and the influence of operation speed, design parameters on the WPL of meshing gear pairs is studied. Finally, the WPL simulation analysis of meshing gear pair is carried out. The generation mechanism of WPL is analyzed and the WPL of each meshing gear pair at different rotational speeds is obtained, which verifies the accuracy of the presented WPL measurement method. The research on the measurement method of WPL can provide support for the optimization design of the high-speed gear pair.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41355741","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}
A methodology is proposed to study the interplay between tooth wear and contact fatigue under elastohydrodynamic lubrication condition. The modeling methodology includes the influence of contact fatigue on wear and the influence of wear on contact fatigue. Firstly, the changes of film pressure and shear force of oil at each meshing point caused by contact fatigue are introduced according to the surface wear model, and the change of wear model is analyzed to study the effect of contact fatigue on wear. Then, according to the elastohydrodynamic lubrication theory, the change in film pressure affected by tooth surface wear is analyzed to study the effect of wear on contact fatigue. Finally, the influence of lubrication conditions on the interplay between tooth surface wear and contact fatigue are analyzed. In addition, an experimental fatigue study is performed and introduced into the model predictions to improve the accuracy of the proposed methodology.
{"title":"Interaction between gear surface wear and contact fatigue","authors":"Shengnan Zhang, Ming Yan, Yushi Wang","doi":"10.1115/1.4062363","DOIUrl":"https://doi.org/10.1115/1.4062363","url":null,"abstract":"\u0000 A methodology is proposed to study the interplay between tooth wear and contact fatigue under elastohydrodynamic lubrication condition. The modeling methodology includes the influence of contact fatigue on wear and the influence of wear on contact fatigue. Firstly, the changes of film pressure and shear force of oil at each meshing point caused by contact fatigue are introduced according to the surface wear model, and the change of wear model is analyzed to study the effect of contact fatigue on wear. Then, according to the elastohydrodynamic lubrication theory, the change in film pressure affected by tooth surface wear is analyzed to study the effect of wear on contact fatigue. Finally, the influence of lubrication conditions on the interplay between tooth surface wear and contact fatigue are analyzed. In addition, an experimental fatigue study is performed and introduced into the model predictions to improve the accuracy of the proposed methodology.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48577364","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}
Tribological behavior of AA-6063 casted by microwave casting process was investigated. In this work, sliding wear analysis has been done on in-situ cast developed through the novel technique. The in-situ cast of AA-6063 was developed using microwave irradiation. Sliding wear process parameters such as normal load, sliding velocity and sliding distance are optimized through Taguchi technique. L9 orthogonal array and signal-to-noise (S/N) analysis is used to obtain the optimumprocess parametersfor wear rate (WR) as the selected response.After optimization, a confirmatory test was performed using the analysis of variance (ANOVA).Scanning electron microscopy (SEM) images, energy dispersive X-ray spectroscopy (EDS) images and frictional characterisationwere usedto study the mechanism of wear.Using the experimental data an adaptive neuro fuzzy inference system (ANFIS) model has been developed and which was further tested using average wear rate.
{"title":"Tribological Behaviour of AA-6063 Cast Using In-Situ Microwave Process By Taguchi Method & ANFIS Model","authors":"V. Gangwar, Sudhir Kumar, H. Singh","doi":"10.1115/1.4062371","DOIUrl":"https://doi.org/10.1115/1.4062371","url":null,"abstract":"\u0000 Tribological behavior of AA-6063 casted by microwave casting process was investigated. In this work, sliding wear analysis has been done on in-situ cast developed through the novel technique. The in-situ cast of AA-6063 was developed using microwave irradiation. Sliding wear process parameters such as normal load, sliding velocity and sliding distance are optimized through Taguchi technique. L9 orthogonal array and signal-to-noise (S/N) analysis is used to obtain the optimumprocess parametersfor wear rate (WR) as the selected response.After optimization, a confirmatory test was performed using the analysis of variance (ANOVA).Scanning electron microscopy (SEM) images, energy dispersive X-ray spectroscopy (EDS) images and frictional characterisationwere usedto study the mechanism of wear.Using the experimental data an adaptive neuro fuzzy inference system (ANFIS) model has been developed and which was further tested using average wear rate.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49553832","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}
Mechanical system often involves the finite line contact of key components such as rolling element bearings and gear pairs. Different contact models have been developed to predict the load-displacement relationship and contact pressure distribution, but there usually exists a trade-off between the accuracy of simulation results and computational cost. An improved slicing technique is presented in this work. According to the half-space theory, a tri-linear fitting model is developed to express the load-displacement relationship and coupling behavior in slices of contact region, which is originally controlled by a spatial convolution. The improved slicing technique is thus formulated based on the tri-linear model. A modified Newton-Raphson algorithm is adopted to solve the free boundary problem of the improved slicing technique. The improved slicing technique is validated to be able to correctly predict the load-displacement relationships and the contact pressure distributions of different contact profiles, especially for contact pressure concentrations which other slicing techniques are unable to predict accurately. The computation speed of the proposed method is much faster than the semi-analytical method and is of the same order of other slicing technique. The high accuracy and low computational cost enable the proposed method to be applied in the on-line calculation of rolling element bearings and other sophisticated mechanical systems.
{"title":"An improved slicing technique for finite line contacts in the modelling of rolling element bearings","authors":"Di Yang, Xi Wang, Yu Hou","doi":"10.1115/1.4062364","DOIUrl":"https://doi.org/10.1115/1.4062364","url":null,"abstract":"\u0000 Mechanical system often involves the finite line contact of key components such as rolling element bearings and gear pairs. Different contact models have been developed to predict the load-displacement relationship and contact pressure distribution, but there usually exists a trade-off between the accuracy of simulation results and computational cost. An improved slicing technique is presented in this work. According to the half-space theory, a tri-linear fitting model is developed to express the load-displacement relationship and coupling behavior in slices of contact region, which is originally controlled by a spatial convolution. The improved slicing technique is thus formulated based on the tri-linear model. A modified Newton-Raphson algorithm is adopted to solve the free boundary problem of the improved slicing technique. The improved slicing technique is validated to be able to correctly predict the load-displacement relationships and the contact pressure distributions of different contact profiles, especially for contact pressure concentrations which other slicing techniques are unable to predict accurately. The computation speed of the proposed method is much faster than the semi-analytical method and is of the same order of other slicing technique. The high accuracy and low computational cost enable the proposed method to be applied in the on-line calculation of rolling element bearings and other sophisticated mechanical systems.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42480567","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}
Shuaijun Ma, Yanjing Yin, Linbo Zhu, Ke Yan, Yongsheng Zhu
As a crucial component, rolling bearings directly determine the reliability of rotating equipment. However, current dynamic models for predicting the bearing performance either ignore the velocity and stress dispersion at the ball/raceway interface or fail to consider the spin moment generated within the interface. To address this issue, the discrete features of the velocity and stress distribution are considered in this paper, and the micro-element approach is used to construct formulas to obtain the traction vectors in two and three dimensions, respectively. Two bearing dynamic models are further developed for these two types of equations: one model considers the spin moment at the interface owing to unequal contact angles between the ball and the two raceways, while the other model ignores this moment. The reliability of these models is validated by comparison with experimental test results, including cage speed and oil film thickness. The predictions from the quasi-static model are used as theoretical values to compare the ability of the two models to simulate bearing performance under different operating conditions. The results show that the prediction results of the model considering the spin moment are closer to the theoretical values than those of the model ignoring this moment. However, the moment increases the friction at the ball/raceway interface, causing this model to underestimate the extent of bearing sliding.
{"title":"Dimensional discussion of traction force vector on ball/raceway interface and study of bearing dynamic behavior","authors":"Shuaijun Ma, Yanjing Yin, Linbo Zhu, Ke Yan, Yongsheng Zhu","doi":"10.1115/1.4062375","DOIUrl":"https://doi.org/10.1115/1.4062375","url":null,"abstract":"\u0000 As a crucial component, rolling bearings directly determine the reliability of rotating equipment. However, current dynamic models for predicting the bearing performance either ignore the velocity and stress dispersion at the ball/raceway interface or fail to consider the spin moment generated within the interface. To address this issue, the discrete features of the velocity and stress distribution are considered in this paper, and the micro-element approach is used to construct formulas to obtain the traction vectors in two and three dimensions, respectively. Two bearing dynamic models are further developed for these two types of equations: one model considers the spin moment at the interface owing to unequal contact angles between the ball and the two raceways, while the other model ignores this moment. The reliability of these models is validated by comparison with experimental test results, including cage speed and oil film thickness. The predictions from the quasi-static model are used as theoretical values to compare the ability of the two models to simulate bearing performance under different operating conditions. The results show that the prediction results of the model considering the spin moment are closer to the theoretical values than those of the model ignoring this moment. However, the moment increases the friction at the ball/raceway interface, causing this model to underestimate the extent of bearing sliding.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49135410","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}
Ismael Tombakti, A. Adesina, Abdullah Alharith, Moataz M. Attallah, B. AlMangour
The influence of laser modes and power on the tribological behavior of additively manufactured Inconel 718 alloys using the direct energy deposition (DED) technique was investigated. The samples were fabricated with continuous wave (CW) and pulse wave (PW) laser modes using 700, 900, and 1100 W laser power. The samples exhibited high hardness (3-5 GPa) and modulus (150 – 200 GPa) which increases with the laser power for CW and PW fabricated samples, and this was associated with the increasing densification and hardening secondary phase. The coefficient of friction increases with laser power for the CW samples but decreases for the PW samples. The samples showed an improved wear rate ranging between 25 and 70 × 10−5 mm3/Nm. Pulse wave samples demonstrated better tribological behavior compared to continuous wave at any laser power. The dominant wear mechanism is the three-body abrasive wear followed by localized and discrete adhesion wear mechanism.
{"title":"Effect of Laser Mode and Power on the Tribological Behavior of Additively Manufactured IN718 Alloy Fabricated by Direct Energy Deposition (DED)","authors":"Ismael Tombakti, A. Adesina, Abdullah Alharith, Moataz M. Attallah, B. AlMangour","doi":"10.1115/1.4062361","DOIUrl":"https://doi.org/10.1115/1.4062361","url":null,"abstract":"\u0000 The influence of laser modes and power on the tribological behavior of additively manufactured Inconel 718 alloys using the direct energy deposition (DED) technique was investigated. The samples were fabricated with continuous wave (CW) and pulse wave (PW) laser modes using 700, 900, and 1100 W laser power. The samples exhibited high hardness (3-5 GPa) and modulus (150 – 200 GPa) which increases with the laser power for CW and PW fabricated samples, and this was associated with the increasing densification and hardening secondary phase. The coefficient of friction increases with laser power for the CW samples but decreases for the PW samples. The samples showed an improved wear rate ranging between 25 and 70 × 10−5 mm3/Nm. Pulse wave samples demonstrated better tribological behavior compared to continuous wave at any laser power. The dominant wear mechanism is the three-body abrasive wear followed by localized and discrete adhesion wear mechanism.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43228339","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}
Bubbly oil lubrication is a type of lubrication method which has a high potential for application. However, the lubricating performance of the bubbly oil has not been thoroughly considered. This paper aims to investigate the lubricating performance of the bubbly oil including generation of the bubbly oil, viscosity characteristics of the bubbly oil and the application study of the bubbly oil lubrication. Due to space limitation, the work is divided into two parts. Part 1 focuses on the generation method of the bubbly oil, observation of the bubbly oil and the measurement of viscosity characteristics under a high shear rate. Part 2 focuses on the application study of the bubbly oil lubrication in high-speed bearing. A generation method for the bubbly oil was proposed by a combination of the dispersed-air method and the pressurized dissolution one. An experiment setup for generating the bubbly oil, an observation system for the bubbly oil and a specially-designed viscometer for the bubbly oil were developed. The research results show that the generation method for the bubbly oil is of high efficiency and stability and the observation system is operational.
{"title":"Study on Lubricating Performance of the Bubbly Oil under High Shear Rate, Part 1: Generation Method and Viscosity Measurement of the Bubbly Oil","authors":"Shuyun Jiang, Shaohua Li, Li Lu, Chibin Zhang","doi":"10.1115/1.4062366","DOIUrl":"https://doi.org/10.1115/1.4062366","url":null,"abstract":"\u0000 Bubbly oil lubrication is a type of lubrication method which has a high potential for application. However, the lubricating performance of the bubbly oil has not been thoroughly considered. This paper aims to investigate the lubricating performance of the bubbly oil including generation of the bubbly oil, viscosity characteristics of the bubbly oil and the application study of the bubbly oil lubrication. Due to space limitation, the work is divided into two parts. Part 1 focuses on the generation method of the bubbly oil, observation of the bubbly oil and the measurement of viscosity characteristics under a high shear rate. Part 2 focuses on the application study of the bubbly oil lubrication in high-speed bearing. A generation method for the bubbly oil was proposed by a combination of the dispersed-air method and the pressurized dissolution one. An experiment setup for generating the bubbly oil, an observation system for the bubbly oil and a specially-designed viscometer for the bubbly oil were developed. The research results show that the generation method for the bubbly oil is of high efficiency and stability and the observation system is operational.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45461542","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}
In this research, aluminum alloy AA5052 based hybrid metal matrix composites (MMCs) were fabricated using in-situ synthesized titanium carbide (TiC) and ex-situ multi-walled carbon nanotube (MWCNT) as reinforcements using the liquid metallurgy route. The wear characteristics of the aluminum hybrid MMCs were analyzed under the synergistic effects of TiC and multi-walled CNT. Pin-on-disc wear apparatus was utilized for the experimental investigation where the hybrid composite is considered as the disc, and the traditional brake pad material is treated as the pin. The parameters i.e. applied load, sliding velocity, sliding distance, and reinforcement content are treated as inputs, whereas the wear rate and coefficient of friction are considered as output variables for the tribological experimentation. The influence of various input process parameters on the tribological behavior of the fabricated samples was investigated. The plastic deformation attained by the base alloy exhibited the delamination, which indicates the adhesive wear, whereas the composites exhibited abrasive nature as analyzed from the wear surface morphology. The wear debris was characterized by flake-sized, corrugated, and oxidized by the microstructural study.
{"title":"Dry sliding wear performances of AA5052 hybrid composite brake disc materials reinforced with in-situ synthesized TiC and multi-walled CNT","authors":"P. Samal, P. Vundavilli","doi":"10.1115/1.4062296","DOIUrl":"https://doi.org/10.1115/1.4062296","url":null,"abstract":"\u0000 In this research, aluminum alloy AA5052 based hybrid metal matrix composites (MMCs) were fabricated using in-situ synthesized titanium carbide (TiC) and ex-situ multi-walled carbon nanotube (MWCNT) as reinforcements using the liquid metallurgy route. The wear characteristics of the aluminum hybrid MMCs were analyzed under the synergistic effects of TiC and multi-walled CNT. Pin-on-disc wear apparatus was utilized for the experimental investigation where the hybrid composite is considered as the disc, and the traditional brake pad material is treated as the pin. The parameters i.e. applied load, sliding velocity, sliding distance, and reinforcement content are treated as inputs, whereas the wear rate and coefficient of friction are considered as output variables for the tribological experimentation. The influence of various input process parameters on the tribological behavior of the fabricated samples was investigated. The plastic deformation attained by the base alloy exhibited the delamination, which indicates the adhesive wear, whereas the composites exhibited abrasive nature as analyzed from the wear surface morphology. The wear debris was characterized by flake-sized, corrugated, and oxidized by the microstructural study.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46626118","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}
In many devices and applications, electrical contacts are exposed to vibrations, sliding, or rolling conditions and are prone to the fretting-based degradation. Thus, lubricants are often employed in such contacts to reduce sliding wear and fretting corrosion. However, due to the non-conductive behavior of the lubricants with fluorocarbons and hydrocarbons, lubricants lead to a few adverse problems. Also, the fluid dynamics upon excitation, vibration or sliding causes extended breaks or gaps in between the conducting surfaces. In reality, this can be noticed during vibrations occurring as a result of earthquakes or technical personnel maintenance. This could also have applications to electrified rolling element bearings. Factors such as surface roughness and fluid viscosity will determine the time taken for the two surfaces of the connectors to separate from a solid conductive contact. In this work, a coupled structural-fluid theoretical model is developed for evaluating such intermittent contact breaks/gaps when two metallic rough surfaces in contact are under vibrations. The model is capable of predicting the increase in the fluid film as well as the contact resistance change with time due to the possible connector vibration. The experimentally observed rocking vibration mode seen in connectors and the time-dependent squeeze film lubrication effect are also considered.
{"title":"Electrical Contact During a Rolling Vibratory Motion Considering Mixed Lubrication","authors":"","doi":"10.1115/1.4062295","DOIUrl":"https://doi.org/10.1115/1.4062295","url":null,"abstract":"\u0000 In many devices and applications, electrical contacts are exposed to vibrations, sliding, or rolling conditions and are prone to the fretting-based degradation. Thus, lubricants are often employed in such contacts to reduce sliding wear and fretting corrosion. However, due to the non-conductive behavior of the lubricants with fluorocarbons and hydrocarbons, lubricants lead to a few adverse problems. Also, the fluid dynamics upon excitation, vibration or sliding causes extended breaks or gaps in between the conducting surfaces. In reality, this can be noticed during vibrations occurring as a result of earthquakes or technical personnel maintenance. This could also have applications to electrified rolling element bearings. Factors such as surface roughness and fluid viscosity will determine the time taken for the two surfaces of the connectors to separate from a solid conductive contact. In this work, a coupled structural-fluid theoretical model is developed for evaluating such intermittent contact breaks/gaps when two metallic rough surfaces in contact are under vibrations. The model is capable of predicting the increase in the fluid film as well as the contact resistance change with time due to the possible connector vibration. The experimentally observed rocking vibration mode seen in connectors and the time-dependent squeeze film lubrication effect are also considered.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49030025","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}
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