Journal of Tribology-transactions of The Asme最新文献_第6页

Pressure Profile and Stiffness Analysis of Supercritical CO2 Inside a Rotating Annulus Cooling Passage Using CFD 旋转环空冷却通道内超临界CO2的CFD压力分布和刚度分析

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-06-22 DOI: 10.1115/1.4062812

M. Uddin, Professor Halim Gurgenci, Zhiqiang Guan

引用次数: 0

Automated Vibration and Acoustic Crepitus Sensing in Humans 人类的自动振动和Crepitus声学传感

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-06-21 DOI: 10.1115/1.4062808

Gregory R. Roytman, Jocelyn Faydenko, Matthew Budavich, Judith D. Pocius, Gregory David Cramer

{"title":"Automated Vibration and Acoustic Crepitus Sensing in Humans","authors":"Gregory R. Roytman, Jocelyn Faydenko, Matthew Budavich, Judith D. Pocius, Gregory David Cramer","doi":"10.1115/1.4062808","DOIUrl":"https://doi.org/10.1115/1.4062808","url":null,"abstract":"\u0000 Crepitus vibrational and acoustic signal analysis of the human facet joints of the lumbar spine has historically been a difficult problem due to the inhomogeneous and varied signal characteristics. Here we improve upon our previous automated computational method, now enhancing it for analysis of human crepitus. Compared with this group's previous studies using a mechanical model; human crepitus is extremely complex. Moreover, there is no existing availability of large numbers of human crepitus data to enable effective machine learning approaches. Therefore, we proposed an automated method (AM) of analysis that, analogous to machine learning, used a test set (n = 16) and an experimental set of data (n = 48). The advantage of beginning with this approach was that we identified characteristics of the signal that are unavailable or otherwise not easily obtained in more advanced methods, such as “black box” machine learning methods. However, we did not have the high fidelity that a machine learning approach would provide. This was shown by only a fair level of inter-rater agreement (Kw = 0.367; SE = 0.054, 95% CI = 0.260-0.474) between the AM and human observers before adjustments were made in the AM. Following adjustments to the AM, inter-rater agreement improved to a substantial level of agreement (Kw = 0.788; SE = 0.056, 95% CI = 0.0.682-0.895). In the future, we recommend a machine learning study with a high number of subjects, that can better capture the nuances of varying types of human crepitus.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42477138","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

Mixed lubrication analysis of scrolls lubricated with CO2/oil mixture based on a homogeneous model 基于均匀模型的CO2/油混合润滑涡旋混合润滑分析

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-06-02 DOI: 10.1115/1.4062690

Chunjie Wei, Hui Song, Z. Hu, Wei Wang

引用次数: 1

A dynamic model of outer race defective bearing considering the unbalanced shaft-bearing system with experimental simulation 考虑非平衡轴-轴承系统的外套圈缺陷轴承动力学模型与实验仿真

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-06-02 DOI: 10.1115/1.4062689

Prashant H. Jain, S. Bhosle, A. Keche, R. Desavale

{"title":"A dynamic model of outer race defective bearing considering the unbalanced shaft-bearing system with experimental simulation","authors":"Prashant H. Jain, S. Bhosle, A. Keche, R. Desavale","doi":"10.1115/1.4062689","DOIUrl":"https://doi.org/10.1115/1.4062689","url":null,"abstract":"\u0000 In this study, the effects of the evolution of bearing outer race defect size and increase in speed on the vibration characteristics of a shaft-bearing system under unbalanced conditions. The contact stiffness between the races and the balls is considered as a series of springs is also incorporated in the model. Hertzian contact deformation theory is used to obtain the contact stiffness. This model considers the contact deformation between the balls and the races, the additional displacement between the balls and the inner race due to radial clearance, and due to defect geometry. The maximum possible radial displacement of the ball into the defect is calculated analytically using the groove radius, ball radius and defect diameter. The rectangular function is used for modelling the defect. MATLAB codes are developed for modelling the shaft-bearing system and for solving the differential equations of motion using the Runge-Kutta method. The vibration responses obtained by modelling and by experimentation show similar vibration characteristics. The investigation shows that the values of statistical parameters initially increase with the increase in defect size and then decrease with a further increase in defect size. While peak and RMS increase with the speed and crest factor and kurtosis decrease with an increase in speed. Peak is more sensitive for diagnosing spalls on outer race and its evolution. This study helps as an effective diagnosis of antifriction bearings having spalls on the outer race under unbalanced conditions.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":"1 10","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41276099","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

Contacting Micro Asperity of a Deformable Surface 可变形表面的接触微粗糙度

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-18 DOI: 10.1115/1.4062576

Shuangbiao Liu, Nicole H. Dorcy, Q. Wang, Y. Chung, S. Berkebile

{"title":"Contacting Micro Asperity of a Deformable Surface","authors":"Shuangbiao Liu, Nicole H. Dorcy, Q. Wang, Y. Chung, S. Berkebile","doi":"10.1115/1.4062576","DOIUrl":"https://doi.org/10.1115/1.4062576","url":null,"abstract":"\u0000 Deterministic contact modeling based on half-space theories has satisfied a wide range of applications. However, the half-space theories themselves do not involve shape effects of roughness on Green's functions/influence coefficients; in deterministic rough-surface contact analyses, the roughness is considered in gap function. This approach can be called the “roughness simplification”. One needs to answer two questions about the validity of the roughness simplification: How appropriate is the roughness simplification in modeling rough-surface contacts? How accurate can the commonly-included contact-plasticity behavior be captured under the roughness simplification? This work utilized a double-scale representation of an asperity--a microscopic deformable asperity stacked on a deformable half-space, to obtain their combined contact responses in both elastic and plastic regimes. The deformation and contact behaviors of asperities thus configured were obtained with finite element method (FEA) and rough-surface half-space contact solvers. Three stages of asperity contact were discovered: the Hertzian stage, the single-region elastoplastic stage, and the two-region elastoplastic stage where the surrounding base material also takes part in the contact. The comparisons of contact deformation and pressure results from both the FEA and half-space contact solvers support the validity of the half-space theories with the roughness simplification for various ellipsoid-shape asperities with circular-bases in both elastic and elastoplastic rough-surface asperity modeling. The research also reveals that when significant plastic deformations occur, asperities with different aspect ratios can bear different maximum elastoplastic contact pressures.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47414023","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

Experimental investigation and Machine Learning modelling of wear characteristics of AZ91 composites AZ91复合材料磨损特性的实验研究与机器学习建模

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-15 DOI: 10.1115/1.4062518

S. S. H. Kruthiventi, D. Ammisetti

{"title":"Experimental investigation and Machine Learning modelling of wear characteristics of AZ91 composites","authors":"S. S. H. Kruthiventi, D. Ammisetti","doi":"10.1115/1.4062518","DOIUrl":"https://doi.org/10.1115/1.4062518","url":null,"abstract":"\u0000 This study's primary goal is to examine the effects of wear parameters and the wear rate (WR) of magnesium (AZ91) composites. The composites are made up of using stir casting process with aluminum oxide (Al2O3) and graphene as reinforcements. In the present work, one material factor (Material Type (MT)) and three tribological factors (load(L), velocity (V), and sliding distance (D)) were chosen to study their influence on the wear rate. Taguchi technique is employed for the design of experiments and it was observed that load (L) is the most influencing parameter on WR, followed by MT, D, and V. The optimal values of influencing parameters for WR are as follows: MT = T2, L = 10 N, V = 2 m/s, and D = 500 m. The wear mechanisms at the highest and lowest WR conditions were also studied by observing their SEM micrographs on wear pin's surface and its debris. From the SEM analysis, it was observed that abrasion, delamination, adhesion and oxidation mechanisms were exhibited on the wear surface. Machine learning (ML) models such as artificial neural network (ANN), adaptive neuro-fuzzy inference system (ANFIS) and decision tree (DT) were used to develop an effective prediction model to predict the output responses at the corresponding input variables. Confirmation tests were conducted under optimal conditions, and the same were examined with the results of ANN, ANFIS and DT. It was noticed that DT model exhibited higher accuracy when compared to other models considered in this study.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45787063","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

Monitoring wear of a deep groove ball bearing using ultrasonic reflection 利用超声反射监测深沟球轴承的磨损

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-15 DOI: 10.1115/1.4062516

Rui Zhou, Meng Li, Rongfeng Zhang, L. Liu, Jun Yang, Heng Liu, Yi Liu

引用次数: 0

Synergistic Effect of FSP and TiB2 on Mechanical and Tribological Behavior of AA2024 Surface Composites FSP和TiB2对AA2024表面复合材料力学和摩擦学性能的协同效应

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-15 DOI: 10.1115/1.4062517

S. Rafi, T. Satish Kumar, T. Thankachan, C. Selvan

引用次数: 2

Friction Characteristics of SUS440C/Si3N4 Lubricated by Polytetrafluoroethylene under Cryogenic Environment 聚四氟乙烯润滑SUS440C/Si3N4在低温环境下的摩擦特性

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-04 DOI: 10.1115/1.4062486

Hiromitsu Kakudo, S. Takada, T. Hirayama

引用次数: 0

Stochastic performance of journal bearing with two-layered porous bush- A machine learning approach 双层多孔轴瓦滑动轴承的随机性能——一种机器学习方法

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-05-04 DOI: 10.1115/1.4062487

Subrata Barman, Kritesh Kumar Gupta, S. Kushari, S. Dey

{"title":"Stochastic performance of journal bearing with two-layered porous bush- A machine learning approach","authors":"Subrata Barman, Kritesh Kumar Gupta, S. Kushari, S. Dey","doi":"10.1115/1.4062487","DOIUrl":"https://doi.org/10.1115/1.4062487","url":null,"abstract":"\u0000 This investigation presents the deterministic and stochastic responses of the journal bearing with two-layered porous bush. Pressure equations in the porous layers and modified Reynolds equations in the clearance region are governed by the finite difference method (FDM). Stochastic analysis based on Monte Carlo Simulation (MCS) is used to investigate the effect of random variation in input parameters caused by uncertain operating conditions, improper installations, and manufacturing imperfections. In order to enhance computational efficiency, this probabilistic study is conducted in conjunction with the machine learning model (ML) based on the Support Vector Machine (SVM) algorithm. The uncertainty in the bearing responses is presented in the form of the probability density function (PDF), considering both the independent and combined effect of the stochastically varied input parameters. Graphical illustration of the data-driven sensitivity represents the relative significance of each input parameter affecting the steady-state responses of the journal bearing with two-layered porous bush. The findings of the present study reveal that the stochastic variations in the input parameters have a profound influence on the operational characteristics of the porous bearing. The outcome of the present study will be helpful in deciding the operational regime of the porous bearing under the practically-relevant stochastic environment.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45669314","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