Article
Engineering, Mechanical
Carl Magnus, Idris T. Gulenc, W. M. Rainforth
Summary: This paper investigates the feasibility of improving the tribological properties of Ti3SiC2 MAX phase composite by employing laser surface texturing. Experimental results show that both line and square textured MAX phase composite surface exhibit excellent wear performance as well as a reduction in friction, which can be attributed to the combined effect of surface texture, topography, surface hardening, and tribofilm evolution.
Article
Instruments & Instrumentation
Jie Ling, Long Chen, Mingming Zhang, Yuchuan Zhu
Summary: A piezoelectric material-based dual-mode electro-hydrostatic actuator (DMEHA) is proposed to improve the low output flow of smart materials-based electro-hydrostatic actuator (EHA) without sacrificing carrying capacity. The DMEHA adopts two piezoelectric pumps in a hybrid serial and parallel configuration to achieve adaptability to different actuation requirements. Mathematical modeling, parameter identification, and experiments are conducted to investigate the characteristics of the DMEHA. Results show a maximum output flow of 1.17 l min(-1) at 360 Hz in the serial mode, and 1.96 l min(-1) at 420 Hz in the parallel mode with corresponding blocking loads of 40 kg and 20 kg, respectively.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Yong Chen, Yiren Zang, Lizhong Lu, Jian Ruan, Chuan Ding, Sheng Li
Summary: The paper focuses on the study of a two-dimensional piston pump used in an aircraft electro-hydrostatic actuator. Mechanical efficiency is crucial for heat generation and energy conservation. Dynamic equations were established and used to determine the normal force and input torque. The cam guide profile and spatial angles were obtained to analyze the positive pressure, input torque, and friction loss. Experimental results validated the simulation model, with a slight deviation corrected by considering the mechanical losses caused by shearing and churning oil.
Article
Engineering, Mechanical
Jiangao Zhao, Yongling Fu, Mingkang Wang, Jian Fu, Qun Chao, Shaopeng Wang, Ming Deng
Summary: Electro-hydrostatic actuators (EHA) demand high efficiency, high speed, and a wide range of speed from piston pumps, requiring the cylinder block/valve plate interface to function as both a bearing and a seal. By establishing friction coefficient equations and utilizing cermet coatings to improve friction performance, the study evaluated the wear status of TiAlN coated and nitrided valve plates. In a wide speed range of 500-10000 rpm, the TiAlN coated valve plate showed a decrease percentage of friction coefficient and a wear rate significantly lower than the nitrided one.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mathematics
Manh Hung Nguyen, Kyoung Kwan Ahn
Summary: This paper develops a novel output feedback control scheme for the motion-tracking problem of an electro-hydrostatic actuator (EHA) in the presence of model uncertainties and external disturbances. The proposed control approach integrates an extended sliding mode observer and a robust nonlinear controller, and employs dynamic surface control technique to effectively mitigate computational burden. The stability and performance of the closed-loop system are analyzed using Lyapunov theory.
Article
Automation & Control Systems
Yassmin Seid Ahmed, Jose M. DePaiva, Fred L. Amorim, Ricardo D. Torres, Wagner de Rossi, Stephen C. Veldhuis
Summary: Laser surface texturing improves surface wettability and roughness, while reducing friction coefficient and wear rate on austenitic stainless steel. Among the textures investigated, square textures show the most significant reduction in friction coefficient and wear rate.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yong Nie, Zhenhua Lao, Jiajia Liu, Yichi Huang, Xiangwei Sun, Jianzhong Tang, Zheng Chen
Summary: This paper presents a disturbance-observer-based sliding mode control strategy for underwater electro-hydrostatic actuators, addressing the issue of sea pressure disturbance. A nonlinear disturbance observer and a non-singular fast terminal sliding mode controller were designed, and comparative simulations were conducted to verify the high tracking performance of the proposed strategy.
Article
Engineering, Mechanical
Ki Chang Bae, Dohyung Kim, Yong Hwan Kim, Jeong-Jung Oak, Heesoo Lee, Wookjin Lee, Yong Ho Park
Summary: This study investigated the wear performance of maraging 18Ni-300 steel fabricated via selective laser melting at different sliding speeds and heat treatment states. The results showed that abrasive wear was the dominant wear mechanism at relatively low sliding speeds, while plastic flow and delamination of the hardened area became predominant at high sliding speeds. The wear resistance of the material was significantly influenced by heat treatment and wear loading direction parameters.
Article
Engineering, Mechanical
Wen Hao Kan, Huizhi Peng, Samuel Lim, Yuman Zhu, Kun Zhang, Aijun Huang
Summary: The sliding behavior of titanium alloys processed by laser powder bed fusion and conventionally-processed alloys was examined. Different microstructures were observed in these samples. When sliding against steel, oxidative, abrasive, and adhesive wear always occurred. However, wear rates were similar regardless of friction and hardness if material removal mainly occurred through abrasion or adhesion. Martensitic phases decomposed during sliding while nano-crystalline grains enhanced oxidative wear and reduced friction. By promoting oxidative wear over abrasive or adhesive wear, wear rates and friction can be substantially reduced with a stable nanocrystalline microstructure that provides ultrahigh hardness.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Optics
Yupeng Cao, Ranran Hu, Weidong Shi, Zhingmin Wang, Ming Qiu, Xudong Zhang, Bin Li
Summary: The effects of laser peen texturing (LPT) parameters on the surface patterns and tribological properties of E690 high-strength steel were investigated through simulation and experiments. The results showed that increasing the number of shocks could increase the plastic deformation depth of the patterns, and the stability of the patterns also increased with the number of shocks. The optimal LPT parameters for wear resistance were found to be a density of 20% and three shocks.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Robotics
Mitsuo Komagata, Ko Yamamoto, Yoshihiko Nakamura
Summary: This study presents a design method for an electro-hydrostatic actuator (EHA), addressing the challenge of achieving compact size and high power transmission efficiency. The method utilizes both macro- and micro-scale designs to determine cylinder parameters and gap width in the gear pump for maximum efficiency-to-volume ratio and minimum power loss. The EHA is developed using modular design and 3D printing, and its power transmission efficiency and backdrivability are evaluated.
Article
Engineering, Manufacturing
Avik Samanta, Wuji Huang, Kyungjun Lee, Xin He, Chanaka Kumara, Jun Qu, Hongtao Ding
Summary: This research evaluates the effect of surface wettability on tribological performance using ball-on-flat tribology testing. M2 tool steel is laser processed and functionalized with fluoro-carbon and nitrile chemistry to achieve distinct oleophobicity and oleophilicity with similar nanoscale surface texture. Ionic liquids are used as additives, and their interaction with the nanoscale textured steel surface is investigated. Reciprocating wear tests are performed on surface-engineered M2 tool steel specimen and a standard steel ball, showing that oleophobic surface results in lower friction, while oleophilic surface modification provides better wear protection. Ammonium-based ILs provide the highest friction reduction, while phosphonium-based ILs offer improved wear protection.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Energy & Fuels
Paolo Casoli, Fabio Scolari, Carlo Maria Vescovini, Massimo Rundo
Summary: With stricter regulations on air quality and emissions, researchers are focused on developing new solutions to improve efficiency and energy saving in off-road mobile machines. By combining hydraulic and electrical components, an electro-hydraulic solution has been developed for a 9-ton excavator. Simulation studies comparing different configurations show that closed-circuit solutions offer higher energy efficiency and require fewer components than open-circuit solutions.
Article
Energy & Fuels
Konrad Johan Jensen, Morten Kjeld Ebbesen, Michael Rygaard Hansen
Summary: This paper introduces a novel electro-hydrostatic actuator concept for large hydraulic manipulators, designed to meet requirements such as load holding, overload handling, and differential flow compensation. The system is shown to have significantly improved efficiency and the ability to regenerate energy when compared to traditional valve-controlled actuators.
Article
Materials Science, Coatings & Films
Shengguan Qu, Jintao Wang, Xiongfeng Hu, Fuqiang Lai, Yunqing Deng, Xiaoqiang Li
Summary: The combination treatment of LST and USR can improve the friction and wear behavior of 20CrMoH steel by forming micro-texture and gradient nanostructure. After the treatment, the specimen showed significant reduction in friction coefficient and wear losses, with different wear mechanisms observed under dry friction and oil lubrication conditions.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Yi Zhu, Tao Peng, Guofei Jia, Hong Zhang, Shuangmei Xu, Huayong Yang
JOURNAL OF CLEANER PRODUCTION
(2019)
Article
Engineering, Mechanical
Y. Yang, Y. Zhu, M. M. Khonsari, H. Yang
Article
Engineering, Mechanical
Y. Zhu, Y. Yang, X. Mu, W. Wang, Z. Yao, H. Yang
Article
Engineering, Manufacturing
Y. Zhu, Y. Yang, P. Lu, X. Ge, H. Yang
VIRTUAL AND PHYSICAL PROTOTYPING
(2019)
Review
Engineering, Mechanical
Yi Zhu, Wenjian Wang, Roger Lewis, Wenyi Yan, Stephen R. Lewis, Haohao Ding
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Mechanical
Hongqin Ding, Peng Lu, Chao Zhang, Yi Zhu, Huayong Yang
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Chemical
Ellen Bergseth, Yi Zhu, Anders Soderberg
Article
Engineering, Mechanical
Y. Yang, Y. Zhu, H. Yang
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Manufacturing
Jian Li, Jing Hu, Yi Zhu, Xiaowen Yu, Mengfei Yu, Huayong Yang
ADDITIVE MANUFACTURING
(2020)
Article
Engineering, Manufacturing
Yi Zhu, Lei Zhou, Shuai Wang, Chao Zhang, Cong Zhao, Lei Zhang, Huayong Yang
VIRTUAL AND PHYSICAL PROTOTYPING
(2020)
Article
Engineering, Manufacturing
Y. Yang, X. Li, M. M. Khonsari, Y. Zhu, H. Yang
ADDITIVE MANUFACTURING
(2020)
Article
Engineering, Manufacturing
Tao Peng, Yanan Wang, Yi Zhu, Yang Yang, Yiran Yang, Renzhong Tang
ADDITIVE MANUFACTURING
(2020)
Review
Engineering, Manufacturing
Chao Zhang, Shuai Wang, Jian Li, Yi Zhu, Tao Peng, Huayong Yang
ADDITIVE MANUFACTURING
(2020)
Editorial Material
Engineering, Manufacturing
Tao Peng, Yi Zhu, Ming Leu, David Bourell
ADDITIVE MANUFACTURING
(2020)
Article
Automation & Control Systems
Yi Zhu, Yang Yang, Yanan Wang, Tao Peng, Lei Zhang, Huayong Yang
Summary: The study explores the use of gradient processing in selective laser melting to achieve localized property design, improve component performance, and save energy. Experimental validation shows that the optimized valve body meets the requirements for shell relative density, fluid passage yield strength, and hardness, reducing friction coefficients and electric energy consumption.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.