Article
Engineering, Mechanical
He Li, Junkai Niu
Summary: This paper investigates the impact of texture on the tribological performance of journal bearings operating under starvation lubrication conditions. The P-theta model with mass conservation boundary conditions accurately predicts the oil film distribution in the full oil film/starvation region of the textured bearing. The study discusses the effects of different levels of starvation lubrication on parameters such as eccentricity, attitude angle, full film area, and friction coefficient in textured bearings. The results show that the severity of the texture's effect on bearing performance varies with starvation levels and that texturing can improve the bearing's operating performance, increase load carrying capacity, reduce friction coefficient, and enhance safety.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Engineering, Mechanical
S. Boedo
Summary: This paper introduces a computationally efficient implementation of a generalized short bearing (GSB) formulation using finite element method, which takes into account the mass conservation in cavitated bearing regions. The results demonstrate that the GSB formulation captures the bearing performance trends well when compared to a complete two-dimensional formulation and experimental results. Moreover, the GSB formulation achieves a computational speed approximately 40 to 200 times faster than the complete formulation for the given examples.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Said Sobhi, Mohamed Nabhani, Khalid Zarbane, Mohamed El Khlifi
Summary: This study developed a numerical model to investigate the effects of cavitation on oscillatory porous squeeze film, revealing that frequency, amplitude, and permeability significantly influence cavitation generation. Comparison with experimental data confirmed the accuracy and practicality of the numerical model.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Wanjun Xu, Shanhui Zhao, Yaoyao Xu, Kang Li
Summary: The study compared the effects of cavitation on various performance parameters of journal bearings, showing that a decrease in cavitation pressure improves load-carrying capacity, especially in lightly loaded cavitated bearings. The difference between the Reynolds model and the JFO theory can generally be ignored in non-cavitated cases and cavitated cases with intermediate to heavy loads, but the accuracy of leakage prediction using the Reynolds model should be carefully evaluated.
Article
Engineering, Chemical
Ke Zhang, Kazuyuki Yagi
Summary: This study introduces a refined hydrodynamic lubrication model that incorporates a high-accuracy numerical algorithm for starved lubrication with free surfaces. The proposed method is compared against conventional models and numerical schemes, showing that it can accurately predict lubrication pressure and maintain accuracy under severe conditions.
Article
Mechanics
Peng Li, Hao Zhang, Xin Li, Zhanqun Shi, Sen Xiao, Fengshou Gu
Summary: The paper investigates the effect of manufacturing errors and misalignment on the lubrication behavior of journal bearings with micro-groove under dynamic loads. A mixed lubrication model is developed, considering factors such as mass conservation cavitation algorithm, asperity contact model, and force balance equation. The performance parameters of bearings with different surface profiles and micro-groove distributions are analyzed, and the results show that manufacturing errors and misalignment have a significant impact on the transient behavior of journal bearings.
Article
Engineering, Mechanical
J. Y. Jang, M. M. Khonsari
Summary: The effect of aerated oil with air bubbles on journal bearings under steady and dynamic loads was investigated using thermohydrodynamic lubrication theory. The Reynolds equation was solved by employing a mass conservation algorithm, and the two-dimensional temperature field equations for both oil and solids were simultaneously solved. The simulations showed that the presence of air bubbles in the lubricating oil had a small effect on the pressure and temperature fields at normal operating speeds, but noticeably reduced density and effective viscosity.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
S. Beamish, R. S. Dwyer-Joyce
Summary: This article presents the design of a journal bearing test platform that utilizes ultrasonic transducers for high-accuracy film thickness measurements. The platform is capable of simulating loading patterns found in real components and allows detailed analysis of the film thickness response to rapidly changing loads. The results demonstrate the advantages of the ultrasonic technique in studying phenomena at the shaft-bearing interface and the successful implementation of the snapshot technique for measurements.
TRIBOLOGY TRANSACTIONS
(2022)
Article
Multidisciplinary Sciences
Govardhan Tingarikar, Achintya Choudhury
Summary: This research paper presents the analysis of vibration generated due to the race waviness of rolling element bearing under external dynamic load. The model considers sinusoidal function or superposition of sinusoidal functions of different orders for the waviness on races. Numerical simulations have been used to analyze the vibration response and spectral components resulting from different orders of waviness on races, validating the vibration frequencies.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Feng Cheng, Fujia Wu, Shuo Wang, Xiaoxing Peng, Yantao Cao, Shifei Yang
Summary: A new theoretical model was proposed to investigate suction damage in journal bearings, comprising lubrication module, boundary module and prediction module. The study found that a stable cavitation area formed in the film rupture region, but no suction cavitation erosion occurred in a constant load journal bearing. Suction cavitation erosion was observed within the suction cavitation region, with higher dimensionless deformation coefficients indicating stronger suction damage.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Energy & Fuels
Tao Nie, Kun Yang, Lei Zhou, Xin Wu, Yin Wang
Summary: This study investigates the application of surface texture technology in reducing friction in journal bearings of internal combustion engines. Through simulation models and experimental validation, it examines the effect of texture shape and position on the load capacity of the bearings.
Article
Mechanics
Abdelhak Megdoud, Belkacem Manser, Idir Belaidi, Farid Bakir, Sofiane Khelladi
Summary: Machine component design and analysis of bearing systems have gained significant attention in recent years. This paper explores the lubricant behavior of dynamically loaded journal bearings using the Proper Generalized Decomposition (PGD) approach, demonstrating its accuracy and efficiency.
COMPTES RENDUS MECANIQUE
(2022)
Article
Engineering, Mechanical
Guoqing Xiong, Zhiwei Mao, Jinjie Zhang, Zijia Wang, Huailei Wang, Zhinong Jiang
Summary: Numerous studies have shown that both journal misalignment and bearing elastic deformation significantly affect lubrication performance. Recent research indicates that viscoelastic deformation is more useful than elastic deformation for determining the effects of strong impact loads. However, there have been no studies on the coupled effects of misalignment and viscoelastic deformation. Therefore, this study proposes a novel transient lubrication model that considers the influences of both misalignment and viscoelastic deformation, and investigates their coupled effects on lubrication performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Amandine Regis, Jean-Marc Linares, Santiago Arroyave-Tobon, Emmanuel Mermoz
Summary: This study investigates the wear of plain bearings subjected to off-centred dynamic loads in order to improve their service life in severe aeronautic conditions. Experimental determination of wear coefficients for running-in and stable wear stages, along with validation of the evolution over time of maximum wear depth and contact zone size, were conducted.
Article
Engineering, Mechanical
Shanshan Wei, Morel Groper
Summary: The Elrod algorithm was used to investigate the impact of axial lubricant supply groove parameters on the performance of a journal bearing. The study provides recommendations for the preferred angular location and main dimensions of the groove, aiming to achieve low power loss and high minimum film thickness.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Mechanics
Fabian Duvigneau, Steffen Nitzschke, Elmar Woschke, Ulrich Gabbert
ARCHIVE OF APPLIED MECHANICS
(2016)
Article
Acoustics
Fabian Duvigneau, Sebastian Koch, Elmar Woschke, Ulrich Gabbert
JOURNAL OF VIBRATION AND CONTROL
(2018)
Article
Engineering, Mechanical
E. Woschke, C. Daniel, S. Nitzschke
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2017)
Article
Acoustics
Sebastian Koch, Fabian Duvigneau, Ryan Orszulik, Ulrich Gabbert, Elmar Woschke
JOURNAL OF SOUND AND VIBRATION
(2017)
Article
Engineering, Industrial
Christoph Rossder, David Schmicker, Konstantin Naumenko, Elmar Woschke
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2018)
Article
Engineering, Biomedical
Cornelius Irmscher, Elmar Woschke, Erik May, Christian Daniel
MEDICAL ENGINEERING & PHYSICS
(2018)
Article
Automation & Control Systems
Christin Doebberthin, Sten Taschenberger, Florian Welzel, Elmar Woschke
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Braj Bhushan Prasad, Fabian Duvigneau, Daniel Juhre, Elmar Woschke
Summary: This article introduces a concept of honeycomb damping plate (HCDP) based on the particle damping technique, aiming to reduce the low-frequency vibration response of wind turbine generators. The efficiency of the HCDP concept is experimentally investigated, and the effects of granular materials and HCDP positioning on vibration damping are analyzed.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Christian Ziese, Cornelius Irmscher, Steffen Nitzschke, Christian Daniel, Elmar Woschke
Summary: This study investigates the vibration behavior of turbocharger rotors, which is mainly influenced by acting loads, the type and operating condition of hydrodynamic bearings. Modelling bearings and considering outgassing processes and thrust bearing are essential for accurate prediction of sub-synchronous vibrations.
Proceedings Paper
Engineering, Mechanical
Fabian Duvigneau, Sebastian Koch, Christian Daniel, Elmar Woschke, Ulrich Gabbert
PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS - IFTOMM, VOL. 4
(2019)
Proceedings Paper
Engineering, Mechanical
Steffen Nitzschke, Elmar Woschke, Christian Daniel
PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS - IFTOMM, VOL. 4
(2019)
Proceedings Paper
Engineering, Mechanical
Lars Spannan, Christian Daniel, Elmar Woschke
PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS - IFTOMM, VOL. 4
(2019)
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)