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HYDRODYNAMIC AND ELASTOHYDRODYNAMIC STUDIES OF A CYLINDRICAL JOURNAL BEARING

Journal of Hydrodynamics 2010年第2期22卷 155-163页

作者： ATTIA HILI Molka BOUAZIZ Slim MAATAR Mohamed FAKHFAKH Tahar HADDAR Mohamed Mechanics Modelling and Production Research Unit (U2MP)National School of Engineers of Sfax(ENIS)BP.11733038sfaxTunisia

In this article,the effect of the bearing elastic deformation on the performance characteristics of a cylindrical journal bearing is *** variety of simulation models covers hydrodynamic（HD） and elastohydrodynamic（EHD） lubrication *** Reynolds equations governing the flow in the clearance space of the journal bearing are obtained by considering the effect of mass transfer across the fluid *** finite element method with an iteration scheme was employed to solve both the Reynolds equation and the three-dimensional elasticity equation representing the displacement field in the bearing *** converged solutions for the lubricant flow and elastic deformation vector are *** characteristics of the journal bearing are computed for HD and EHD *** simulation results show that the flexibility of bearing liner has a significant influence on the performance of a cylindrical journal ***,the elastic deformations of the bearing liner extend the pressure area in the bearing and increase the minimum film ***,dynamic coefficient,load capacity and attitude angle decrease.

关键词： Reynolds equation hydrodynamic(HD) and elastohydrodynamic(EHD) lubrication theories dynamic coefficients relative eccentricity deformation coefficient

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Experimental Investigation of the Creep Behaviour of Glulam Compression-Bending Members

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Journal of Renewable Materials 2022年第6期10卷 1517-1535页

作者： Yifei Yin Lirong Qu Weidong Lu Chengshuai Li College of Civil Engineering Nanjing Tech UniversityNanjing211816China

Creep test results of glulam members under compression and bending were studied in this *** creep tests were conducted to investigate the influence of the stress level and relative eccentricity on the creep deformation of glulam *** test results showed that the creep deformation trends of glulam members under long-term compression and bending loading were similar;the creep deformation increased with increases in both the stress level and relative ***,the relative creep deformation decreased with the increase in both the stress level and relative eccentricity under long-term loading,and a five-parameter creep model was proposed to analyse the creep mechanism of glulam members under compression and *** good fitness of the test results indicated that the five-parameter model was able to accurately simulate the creep deformation of glulam compression-bending ***,a numerical model was developed using the creep equation,which was related to the parameter a and *** simulation results were in good agreement with the test results,and the parameters a and b were correlated to the relative eccentricity and stress level,*** on the corrected parameters a and b,the relative creep deformation of glulam compression-bending members was predicted over 50 years.

关键词： Glulam compression-bending members creep stress level relative eccentricity

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