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arXiv 2024年

作者： Wang, Baiyi Zhang, Zipeng Siarry, Patrick Liu, Xinhua Królczyk, Grzegorz Hua, Dezheng Brumercik, Frantisek Li, Zhixiong School of Mechatronic Engineering China University of Mining and Technology Xuzhou China University Paris-Est Créteil Val de Marne 61 Av. du General de Gaulle Creteil94010 France Department of Manufacturing Engineering and Automation Products Opole University of Technology Opole45-758 Poland Department of Design and Machine Elements Faculty of Mechanical Engineering University of Zilina Univerzitna 1 Zilina010 26 Slovakia Yonsei Frontier Lab Yonsei University Seoul03722 Korea Republic of

As a new intelligent optimization algorithm, the African vultures optimization algorithm (AVOA) has been widely used in various fields today. However, when solving complex multimodal problems, the AVOA still has some shortcomings, such as low searching accuracy, deficiency on the search capability and tendency to fall into local optimum. In order to alleviate the main shortcomings of the AVOA, a nonlinear African vulture optimization algorithm combining Henon chaotic mapping theory and reverse learning competition strategy (HWEAVOA) is proposed. Firstly, the Henon chaotic mapping theory and elite population strategy are proposed to improve the randomness and diversity of the vulture's initial population;Furthermore, the nonlinear adaptive incremental inertial weight factor is introduced in the location update phase to rationally balance the exploration and exploitation abilities, and avoid individual falling into a local optimum;The reverse learning competition strategy is designed to expand the discovery fields for the optimal solution and strengthen the ability to jump out of the local optimal solution. HWEAVOA and other advanced comparison algorithms are used to solve classical and CEC2022 test functions. Compared with other algorithms, the convergence curves of the HWEAVOA drop faster and the line bodies are smoother. These experimental results show the proposed HWEAVOA is ranked first in all test functions, which is superior to the comparison algorithms in convergence speed, optimization ability, and solution stability. Meanwhile, HWEAVOA has reached the general level in the algorithm complexity, and its overall performance is competitive in the swarm intelligence algorithms. © 2024, CC BY.

关键词： Computational complexity

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Real-Time and Online Lubricating Oil Condition Monitoring Enabled by Triboelectric Nanogenerator

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ACS NANO 2021年第7期15卷 11869-11879页

作者： Zhao, Jun Wang, Di Zhang, Fan Liu, Yuan Chen, Baodong Wang, Zhong Lin Pan, Jinshan Larsson, Roland Shi, Yijun Lulea Univ Technol Div Machine Elements SE-97187 Lulea Sweden Beijing Univ Chem Technol Coll Mech & Elect Engn Beijing 100029 Peoples R China Univ Sussex Sch Engn & Informat Dept Engn & Design Brighton BN1 9RH E Sussex England Chinese Acad Sci CAS Ctr Excellence Nanosci Beijing Inst Nanoenergy & Nanosyst Beijing Key Lab Micronano Energy & Sensor Beijing 101400 Peoples R China KTH Royal Inst Technol Dept Chem Div Surface & Corros Sci SE-10044 Stockholm Sweden

An intelligent monitoring lubricant is essential for the development of smart machines because unexpected and fatal failures of critical dynamic components in the machines happen every day, threatening the life and health of humans. Inspired by the triboelectric nanogenerators (TENGs) work on water, we present a feasible way to prepare a self-powered triboelectric sensor for real-time monitoring of lubricating oils via the contact electrification process of oil-solid contact (O-S TENG). Typical intruding contaminants in pure base oils can be successfully monitored. The O-S TENG has very good sensitivity, which even can respectively detect at least 1 mg mL(-1) debris and 0.01 wt % water contaminants. Furthermore, the real-time monitoring of formulated engine lubricating oil in a real engine oil tank is achieved. Our results show that electron transfer is possible from an oil to solid surface during contact electrification. The electrical output characteristic depends on the screen effect from such as wear debris, deposited carbons, and age-induced organic molecules in oils. Previous work only qualitatively identified that the output ability of liquid can be improved by leaving less liquid adsorbed on the TENG surface, but the adsorption mass and adsorption speed of liquid and its consequences for the output performance were not studied. We quantitatively study the internal relationship between output ability and adsorbing behavior of lubricating oils by quartz crystal microbalance with dissipation (QCM-D) for liquid-solid contact interfaces. This study provides a real-time, online, self-powered strategy for intelligent diagnosis of lubricating oils.

关键词： lubricating oils condition monitoring triboelectric nanogenerator TENG smart machines

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The need for polishing and occlusal adjustment of zirconia prostheses for wear on antagonist teeth

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DENTAL MATERIALS JOURNAL 2021年第3期40卷 650-656页

作者： Tachibana, Keishu Atsuta, Ikiru Tsukiyama, Yoshihiro Kuwatsuru, Rika Morita, Takehiro Yoshimatsu, Hiroya Matsushita, Yasuyuki Narimatsu, Ikue Ayukawa, Yasunori Sawae, Yoshinori Koyano, Kiyoshi Kyushu Univ Fac Dent Sci Div Oral Rehabil Sect Implant & Rehabil DentHigashi Ku 3-1-1 Maidashi Fukuoka 8128582 Japan Kyushu Univ Fac Dent Sci Div Adv Dent Devices & Therapeut Higashi Ku 3-1-1 Maidashi Fukuoka 8128582 Japan Kyushu Univ Fac Dent Sci Div Oral Biol Sci Sect Dent EducHigashi Ku 3-1-1 Maidashi Fukuoka 8128582 Japan Kyushu Univ Dept Mech Engn Machine Elements & Design Lab Nishi Ku 744 Motomachi Fukuoka 8190395 Japan Kyushu Univ Fac Engn Nishi Ku 744 Motomachi Fukuoka 8190395 Japan

The attrition of enamel when opposed by ceramics is of great concern. The purpose of this study was to evaluate enamel wear against high translucent zirconia (Zr), lithium disilicate (LD), gold (Au), and enamel (E) with different surface and contact conditions. The materials were divided into two groups: polished and ground (n=8 each). Two-body wear tests were performed against human enamel with vertical and horizontal, horizontal, and vertical repetitive movements as experiments 1 to 3 respectively. The surface roughness of all materials except Zr changed throughout the experiments. In experiment 1, Zr and Au showed less antagonist wear when polished than when ground. In experiment 2, polished groups showed less antagonist wear than ground groups in all materials. In experiment 3, Zr and LD exerted greater antagonist wear than E, regardless of Ra. These findings confirm the importance of polishing and occlusal adjustment of zirconia.

关键词： Enamel wear Zirconia Polished surface Ground surface Occlusal contact

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Effects of surface micro-structures on capacitances of the dielectric layer in triboelectric nanogenerator: A numerical simulation study

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NANO ENERGY 2021年 79卷

作者： Xi, Yinhu Zhang, Fan Shi, Yijun Lulea Univ Technol Div Machine Elements SE-97187 Lulea Sweden Xi An Jiao Tong Univ Sch Mech Engn Theory Lubricat & Bearing Inst Key Lab Educ Minist Modern Design & Rotor Bearing Xian 710049 Peoples R China KTH Royal Inst Technol Dept Chem Div Surface & Corros Sci SE-10044 Stockholm Sweden

Triboelectric nanogenerator (TENG) provides a promising approach for energy harvesting and sensing. Microstructures are often employed at dielectric layer for improving efficiency, but the effects on the electric output performance of TENG are not well understood. In this work, we conduct a numerical simulation study based on the planar capacitor analytical method to study the electric output performance for contact-separation (CS) TENG. Different from previous work, which only investigates the effects on the real contact area, this work also studies the effects of the surface micro-structures on the capacitance and the consequent effects on the electronic output performance. The separation to contact open circuit (OC) output voltage is focused on, which is widely employed for sensor applications. The effects of the capacitance variations on OC output voltages under different elastic modulus and micro-structure geometrical parameters are investigated. The results indicate that the capacitance variations can even lead up to more than 100% deviation of the OC output voltages, which confirms that the effect of the capacitance variations is also an important factor. More importantly, it is found that some existing experimental data cannot be explained/simulated by models without consideration of the capacitance variations, and it is more correct to use the ratio of real contact area to capacitance variations to predict the open circuit output voltage of TENG instead of only using contact area when the micro-structure size is larger than 10 mu m.

关键词： Triboelectric Nanogenerator TENG Separation-to-contact Surface micro-structures Numerical simulation Capacitance

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Impact of backlash, manufacturing deviations and friction on the load sharing factor of planetary gear systems

Impact of backlash, manufacturing deviations and friction on...

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6th International BAPT Conference on Power Transmissions, PT 2019

作者： Mihailidis, Athanassios Moisiadis, Anastasios Psarros, Andreas Lab of Machine Elements and Machine Design School of Mechanical Engineering Faculty of Engineering Aristotle University of Thessaloniki Thessaloniki54624 Greece Department of Mechanical Engineering School of Technological Applications University of Applied Sciences of Cen-tral Macedonia Serres Greece

Techniques and software tools, which were recently introduced by the authors, allowed for effi-cient automatic generation of 3D gear flanks and selective meshing of the gears of a simple planetary gear system with backlash and manufacturing imperfections. Friction of the meshing gear flanks was neglected. First results were promising and showed that even in geometrically perfect planetary gear systems the torque distribution is not uniform. It was further verified that pitch errors have a strong impact on the load distribution and that a self-aligning sun gear significantly enhances the torque distribution among the planets. In the current study, the procedure mentioned above is enhanced in several aspects. First, the tooth friction is considered. The friction coefficient is assumed constant along the path of contact;however different values for the sun-planet and planet-ring gear mesh may be given to account for the different contact conditions. Second, deviations are generated between given limits in a stochastic way. This feature significantly reduces the time needed to setup a model. Third, the entire analysis procedure is further automated by extensively employing Python scripting, enabling the solution of successive snapshots in much shorter time. Besides the torque distribution among the planets, the mesh load factor Kγ and the deformation of the teeth, the planet bearing load is also shown. © 2019 The Authors, published by EDP Sciences.

关键词： Friction

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Noncontact triboelectric nanogenerator for human motion monitoring and energy harvesting

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NANO ENERGY 2020年第0期69卷 104390-000页

作者： Xi, Yinhu Hua, Jing Shi, Yijun Lulea Univ Technol Div Machine Elements Dept Engn Sci & Math SE-97187 Lulea Sweden Xi An Jiao Tong Univ Theory Lubricat & Bearing Inst Key Lab Educ Minist Modern Design & Rotor Bearing Syst Xian 710049 Peoples R China

Monitoring human motion and harvesting its energy is an interesting and important topic. Triboelectric nanogenerators (TENGs) have shown their potential for signal detecting and energy harvesting. In this paper, a noncontact paper-based TENG is creatively proposed to be used as a self-powered human motion monitoring sensor and also to be used for human motion energy harvesting. The noncontact mode avoids the requirement of direct physical contact between the TENG and the human subject, which fascinates the application of TENG and can increase its service life. It is found that the walking gait cycle (leg raising and falling), moving direction, walking or running speed and moving path can be reflected by the output voltage signals directly and clearly. Noncontact human motion energy harvesting is also achieved by using this TENG with a rectification circuit. It is also surprisingly found that this TENG is able to detect human motion even through a building wall, and the output voltage is strong enough to be captured by a normal multimeter without any additional amplification circuit. This study opens up a new method for self-powered noncontact human movement detecting and monitoring.

关键词： Noncontact Self-powered Human motion monitoring Triboelectric nanogenerator Energy harvesting

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Toward wear-resistive, highly durable and high performance triboelectric nanogenerator through interface liquid lubrication

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NANO ENERGY 2020年 72卷 104659-104659页

作者： Wu, Jian Xi, Yinhu Shi, Yijun Lulea Univ Technol Div Machine Elements S-97187 Lulea Sweden Nanjing Tech Univ State Key Lab Mat Oriented Chem Engn Nanjing 211816 Peoples R China Xi An Jiao Tong Univ Theory Lubricat & Bearing Inst Key Lab Educ Minist Modern Design & Rotor Bearing Syst Xian 710049 Peoples R China

Triboelectric nanogenerator (TENG) has been proved as a powerful approach to harvest ambient mechanical energy for many technological applications. However, the service lifetime, stability and robustness of TENG are a challenge owing to the wearing and surface degradation. In this manuscript, liquid lubrication is introduced for the first time to increase the anti-wear property of TENG. The influence of the lubricant layer between the surfaces on TENG outputs is studied. It is surprising to find that proper liquid lubrication can not only provide a super wear-resistive TENG, but also can increase the electric outputs. In comparison to a slide-mode TENG with solid-solid contact, the service life of TENG can be greatly improved through liquid lubrication and there is no detected wear even after 36,000 cycles of operation. Specially, the open-circuit voltage and short-circuit current of squalane-lubricated TENG can be both more than 3 times of the unlubricated TENG. For unlubricated TENG, a transfer polymer film adheres to the harder material surface and reduces the contact effectiveness. Liquid lubrication is able to avoid the formation of the transfer film, increase the effective solid-solid contact area and squeeze the air at the interface, thus giving rise to higher electric outputs. Our study opens a new approach for extending the lifetime and stability of TENGs.

关键词： TENG Liquid lubrication Lifetime Stability High performance

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Hyaline cartilage next generation implants from adipose-tissue-derived mesenchymal stem cells: Comparative study on 3D-printed polycaprolactone scaffold patterns

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JOURNAL OF TISSUE ENGINEERING AND REGENERATIVE MEDICINE 2019年第2期13卷 342-355页

作者： Theodoridis, Konstantinos Aggelidou, Eleni Vavilis, Theofanis Manthou, Maria Eleni Tsimponis, Antonios Demiri, Efterpi C. Boukla, Anna Salpistis, Christos Bakopoulou, Athina Mihailidis, Athanassios Kritis, Aristeidis Aristotle Univ Thessaloniki AUTh Fac Hlth Sci Sch Med Dept Physiol & Pharmacol Thessaloniki Greece Aristotle Univ Thessaloniki AUTh Fac Hlth Sci Sch Med cGMP Regenerat Med FacilDept Physiol & Pharmacol Thessaloniki Greece Aristotle Univ Thessaloniki AUTh Fac Hlth Sci Sch Med Lab Histol Embryol & Anthropol Thessaloniki Greece Aristotle Univ Thessaloniki AUTh Papageorgiou Hosp Sch Med Dept Plast Surg Thessaloniki Greece Hippokrateion Hosp Dept Immunol Histocompatibil Ctr Thessaloniki Greece Aristotle Univ Thessaloniki AUTh Sch Mech Engn Lab Machine Elements & Machine Design Thessaloniki Greece Aristotle Univ Thessaloniki AUTh Fac Hlth Sci Sch Dent Dept Prosthodont Thessaloniki Greece

We used additive manufacturing to fabricate 3D-printed polycaprolactone scaffolds of different geometry topologies and porosities. We present a comparative analysis of hyaline cartilage development from adipose-tissue-derived mesenchymal stem cells (ADMSCs) on three different, newly designed scaffold geometry patterns. The first scaffold design (MESO) was based on a rectilinear layer pattern. For the second pattern (RO45), we employed a 45 degrees rotational layer loop. The design for the third scaffold (3DHC) was a three-dimensional honeycomb-like pattern with a hexagonal cellular distribution and small square shapes. We examined cell proliferation, colonization, and differentiation, in relation to the scaffold's structure, as well as to the mechanical properties of the final constructs. We gave emphasis on the scaffolds, both microarchitecture and macroarchitecture, for optimal and enhanced chondrogenic differentiation, as an important parameter, not well studied in the literature. Among the three patterns tested, RO45 was the most favourable for chondrogenic differentiation, whereas 3DHC better supported cell proliferation and scaffold penetration, exhibiting also the highest rate of increase onto the mechanical properties of the final construct. We conclude that by choosing the optimal scaffold architecture, the resulting properties of our cartilaginous constructs can better approximate those of the physiological cartilage.

关键词： ADMSCs cartilage PCL scaffold pore size regenerative medicine scaffold architecture tissue engineering 3D-printing

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Controllable phase transformation of fluoridated calcium phosphate ultrathin coatings for biomedical applications

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JOURNAL OF ALLOYS AND COMPOUNDS 2020年 847卷 155920-155920页

作者： Ge, Xiang Zhao, Jianming Lu, Xiong Li, Zhaoyang Wang, Kefeng Ren, Fuzeng Wang, Menghao Wang, Qun Qian, Bao Tianjin Univ Sch Mech Engn Key Lab Mech Theory & Equipment Design Minist Educ Tianjin 300354 Peoples R China Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Kowloon Clear Water Bay Hong Kong Peoples R China TCPS Co Ltd Tianjin 300384 Peoples R China Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China Tianjin Univ Sch Mat Sci & Engn Tianjin Key Lab Composite & Funct Mat Tianjin 300350 Peoples R China Sichuan Univ Natl Engn Res Ctr Biomat Chengdu 610064 Peoples R China Southern Univ Sci & Technol Dept Mat Sci & Engn Shenzhen 518055 Guangdong Peoples R China Southern Univ Sci & Technol Dept Chem Shenzhen 518055 Guangdong Peoples R China MianYang Teachers Coll Coll Life Sci & Biotechnol Mianyang 621006 Sichuan Peoples R China Univ Kassel Dept Machine Elements & Engn Design D-34125 Kassel Germany

Titanium has been widely used in medical implants for hard tissue replacements. Nevertheless, the bioinert innate oxide layer on the titanium implant surface usually makes the implant fail to osseointegrate with the surrounding tissue after surgery. To improve the bioactivity of titanium implants, the deposition of calcium phosphate (CaP) coatings attracts much research interest owing to the excellent bioactivity and biocompatibility of CaP. This work successfully developed a promising synthetic method to prepare uniform fluoridated CaP coatings with ultrathin thicknesses (similar to 170 nm) and desired phases on acid etched pure titanium (AETi) substrates. A dense ultrathin coating with a dominant phase of fluoridated amorphous CaP (FACP) was obtained by an electrochemical deposition method in galvanostatic mode. After a heat treatment at 600 degrees C for 3 h in a humid atmosphere, the as-prepared coating was transformed to a coating with a dominant phase of fluoridated hydroxyapatite (FHA). Additionally, the dominant phase of the coating could be transformed from FACP to alpha-tricalcium phosphate (alpha-TCP) by a heat treatment at 800 degrees C for 3 h. Unlike previously reported fluoridated CaP coatings with thicknesses of around several micrometers, the ultrathin thickness could potentially enhance the adhesive strength and ductility of coating. Notably, the fluorine incorporation in the coating could bring in additional benefits such as lower solubility, higher antibacterial activity, and higher adhesive strength. Electrochemical deposition associated with post heat treatment could obtain fluoridated CaP coatings with different desired phases in a controllable manner, which is very important since CaPs with different phases possess different properties and may be suitable for different biomedical applications. This study proposed a promising, simple, and low-cost method which can endow complex-shaped titanium implants with better bioactivity for dental and or

关键词： Electrochemical deposition Ultrathin coating Phase transformation Fluoridated amorphous calcium phosphate (FACP) Fluoridated hydroxyapatite (FHA) alpha-tricalcium phosphate (alpha-TCP)

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Cicada-inspired fluoridated hydroxyapatite nanostructured surfaces synthesized by electrochemical additive manufacturing

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MATERIALS & design 2020年 193卷

作者： Ge, Xiang Zhao, Jianming Esmeryan, Karekin D. Lu, Xiong Li, Zhaoyang Wang, Kefeng Ren, Fuzeng Wang, Qun Wang, Menghao Qian, Bao Tianjin Univ Sch Mech Engn Key Lab Mech Theory & Equipment Design Minist Educ Tianjin 300354 Peoples R China Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Kowloon Clear Water Bay Hong Kong Peoples R China TCPS Co Ltd Tianjin 300384 Peoples R China Bulgarian Acad Sci Georgi Nadjakov Inst Solid State Phys Acoustoelect Lab 72 Tzarigradsko Chaussee Blvd Sofia 1784 Bulgaria Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China Tianjin Univ Sch Mat Sci & Engn Tianjin Key Lab Composite & Funct Mat Tianjin 300350 Peoples R China Sichuan Univ Natl Engn Res Ctr Biomat Chengdu 610064 Peoples R China Southern Univ Sci & Technol Dept Mat Sci & Engn Shenzhen 518055 Guangdong Peoples R China MianYang Teachers Coll Coll Life Sci & Biotechnol Mianyang 621006 Sichuan Peoples R China Southern Univ Sci & Technol Dept Chem Shenzhen 518055 Guangdong Peoples R China Univ Kassel Dept Machine Elements & Engn Design D-34125 Kassel Germany

Recently, the cicada-inspired nanostructured surfaces have attracted much interest because they possess remarkable bactericidal ability. However, Gram-positive bacteria are less damageable by the nanopillar structure of a cicada wing surface compared to Gram-negative species. To overcome this shortcoming, fluoridated hydroxyapatite (FHA) is employed owing to its effective antibacterial ability against both Gram-negative and Gram-positive bacteria. Here, we design a novel potential antibacterial surface by combining the cicada wing like nanopillar structure and the FHA together to potentially exert the advantages of physical and chemical antibacterial strategies simultaneously for battling the antibiotic-resistant pathogenic bacteria more effectively. Cicada-inspired FHA nanostructured surfaces have been successfully fabricated on acid-etched titanium (AETi) plates using an electrochemical additive manufacturing (ECAM) method for the first time. The as-prepared FHA nanopillar array consists of close-packed individual nanopillars with diameters, heights, and aspect ratios of-65-95 nm,-380-510 nm, and -4.5-7.5, respectively. The chemical composition of the FHA nanopillar array is similar to that of the Ca-10(PO4)(6)(OH)F. Individual FHA nanopillars possess high crystallinity, long-range regularity, and flaw-free lattices with the [0001] orientation. Our new, cost-effective, and time-saving method for fabricating cicada-inspired FHA nanostructured surfaces could potentially endow orthopedic and dental implants with enhanced antibacterial performance for biomedical applications. (C) 2020 The Author(s). Published by Elsevier Ltd.

关键词： Cicada-inspired Biomimetic Fluoridated hydroxyapatite (FHA) Nanostructured surfaces Non-antibiotic antibacterial Electrochemical additive manufacturing (ECAM)

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