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Quenched PVDF/PMMA Porous Matrix for Triboelectric Energy Harvesting and Sensing

Energy & Environmental Materials 2025年第1期8卷 229-238页

作者： Assem Mubarak Bayandy Sarsembayev Yerzhigit Serik Abdirakhman Onabek Zhanat Kappassov Zhumabay Bakenov Kazuyoshi Tsuchiya Gulnur Kalimuldina Department of Mechanical and Aerospace Engineering School of Engineering and Digital Sciences Nazarbayev University Institute of Smart Systems and Artificial Intelligence Nazarbayev University Department of Robotics Engineering School of Engineering and Digital Sciences Nazarbayev University Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Micro/Nano Technology Center Tokai University

The rapid development of nanotechnology has significantly revolutionized wearable electronics and expanded their *** introducing innovative solutions for energy harvesting and autonomous sensing,this research presents a cost-effective strategy to enhance the performance of triboelectric nanogenerators(TENGs).The TENG was fabricated from polyvinylidene fluoride(PVDF) and N,N'-poly(methyl methacrylate)(PMMA) blend with a porous structure via a novel optimized quenching method.

关键词： N,N′-poly(methyl methacrylate) (PMMA) robotic tactile sensors polyvinylidene fluoride (PVDF) quenching triboelectric nanogenerators (TENGs)

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Toward smart manufacturing systems incorporating reconfiguration issues

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International Journal of Industrial and Systems engineering 2024年第1期46卷 1-33页

作者： Garbie, Ibrahim H. Garbie, Abdelrahman I. Department of Mechanical Engineering-Industrial Engineering Program College of Engineering at Helwan Helwan University Cairo Egypt Department of Mechanical Engineering University of Louisiana at Lafayette LafayetteLA United States

Nowadays, Industry 4.0 will become urgently implemented in most developed countries, although it is still mainly conceptual. As there are three different aspects making up Industry 4.0 (I4.0), such as digital systems, biological systems, and physical systems, most of the research published works were focused on mainly the first one. The smart manufacturing system (SMS) is not an invention, although it is representing the heart of I4.0. The SMS is a rebirth of a new version and innovation of production systems taken into consideration reconfiguring the existing manufacturing systems through adding machines with sensors, actuators, and control architectures for achieving the ultimate goals of I4.0. There are many challenges when reconfiguring these systems as an essential requirement to implement I4.0, representing the degree of individual system complexity, reconfigurable machines, material handling systems, system layout, competitive manufacturing strategies, leanness agility, and embedded systems (cyber-physical systems). In this paper, a new perspective of reconfiguring manufacturing systems will be figured out, and the reconfigurability level toward I4.0 will be presented. © 2024 Inderscience Enterprises Ltd.

关键词： Industry 4.0

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Exploring the role of graphene filler on mechanical properties of cotton/viscose hybrid composites

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Interactions 2024年第1期245卷 1-9页

作者： K, Arunkumar S, Seenivasan M S, Sureshkumar C, Chanakyan Bordoloi, Namrata P, Ramkumar Department of Mechanical Engineering MVJ College of Engineering College Bangalore560067 India Department of Mechanical Engineering Rathinam Technical Campus Coimbatore641021 India Department of Robotics and Automation Sri Ramakrishna Engineering College Coimbatore641022 India Department of Mechanical Engineering.Kalasalingam Academey of Research and Education Virudhunagar India

The work intends to prepare a cotton/viscose fabric-reinforced hybrid composite (CVFRHC) using a compression moulding process using graphene as a filler material and investigate the mechanical characteristics of the composite, including its tensile strength, flexural strength, impact strength, and hardness. The graphene filler was combined with the matrix material in several proportions: 1 weight% (wt%), 2 wt%, and 3 wt%. It was found that the mechanical characteristics of the composite were enhanced by the filler addition. With an increased tensile strength of 70.9 MPa and flexural strength of 384 MPa, the hybrid composite containing 3-weight% graphene was shown to be effective. The addition of 3 wt% resulted in improvements of 10.6% in tensile strength and 9.6% in flexural strength. The graphene as a nano filler used to enhance the mechanical properties of the polymer matrix compisites. This is due to the proper dispersion of graphene filler with the polymer matrix which leads to enhance the interfacial bonding between the hybrid matrix and the hybrid fibres. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Hybrid composites

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Recent Advancement in Bioabsorbable Metals and Their Alloys for Implant Application—a Review

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Journal of The Institution of Engineers (India): Series D 2024年 1-17页

作者： Kadam, K.S. Gadakh, V.S. Department of Mechanical Engineering Dr. Vithalrao Vikhe Patil College of Engineering Ahmednagar414111 India Department of Automation and Robotics Engineering Amrutvahini College of Engineering Sangamner Ahmednagar422608 India

The emergence of bioabsorbable implant materials has generated significant enthusiasm in medical and engineering research. The present systematic review study thoroughly examines the development, characteristics, uses, and difficulties associated with bioabsorbable materials, specifically emphasizing magnesium, zinc, iron, and alloys. Bioabsorbable implant materials have become popular in orthopaedic and dental surgery because they enhance tissue regeneration while minimizing foreign body responses. Using bioabsorbable implant materials can lessen the requirement for implant removal operations while also improving patient outcomes. Developing bioabsorbable implant materials is a fascinating field of study with the potential to transform medical implant technology. The present systematic review study thoroughly examines the development, characteristics, uses, and difficulties associated with bioabsorbable materials, specifically emphasizing magnesium, zinc, iron, and alloys. The novelty of the present review is that a roadmap for future research is outlined. Thus, the present review thoroughly analyses the latest discoveries in bioabsorbable materials, providing valuable insights that could improve implant technology and significantly transform medical treatments and patient care. © The Institution of Engineers (India) 2024.

关键词： Magnesium alloys

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Effects of Addition of Graphite on the Tribological Behaviour of Al7075-SiC Hybrid Composites Using Design of Experiments

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Journal of Bio- and Tribo-Corrosion 2024年第3期10卷 1-11页

作者： Gudipalli, Krishna Reddy V Chapke, Yashwant Guddhur, Hareesha Doddamani, Saleemsab Department of Mechanical Engineering Government Polytechnic Channasandra Karnataka Bangalore India Department of Automation & amp Robotics JSPM’S Rajarshi Shahu College of Engineering Maharashtra Pune India Department of Mechanical Engineering Government Engineering College Karnataka HuvinaHadagali India Department of Mechanical Engineering National Institute of Technology Karnataka Karnataka Surathkal India

Despite the widespread use of Al7075-SiC composites in various engineering applications, their tribological performance remains a subject of interest due to challenges related to friction and wear. This study addresses the need for improved lubrication in such composites by investigating the potential of Al7075-SiC/Graphite hybrid materials. The incorporation of graphite particles, up to 9% by weight, aims to enhance the self-lubricating properties of these composites. Stir casting is employed to fabricate specimens with varying graphite content (3–9% by weight), followed by comprehensive tribological assessments under dry sliding conditions. Factors including sliding distance, load, and graphite composition are systematically evaluated using Taguchi’s optimization techniques, including design of experiments, ANOVA, and regression analyses. Results reveal that the addition of 9% graphite content notably reduces both the coefficient of friction and wear rate. According to the data, sliding distance significantly impacts wear behaviour, followed by the applied load. In contrast, the composition has a 77% impact on the coefficient of friction than load, while the sliding distance has a relatively small impact. As a result, the Al7075-SiC/Graphite composite material demonstrated its suitability as a self-lubricating substance. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Silicon carbide

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Control of a Two-wheeled Self-balancing Robot With a Sliding Mechanism

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Journal of Institute of Control, robotics and Systems 2025年第1期31卷 37-43页

作者： Kim, David Kim, Hyun Seok Choi, Dongil Department of Mechanical Engineering Myongji University Korea Republic of Smart Robotics Team Hyundai Rotem Korea Republic of

Two-wheeled self-balancing robot maintains balance and performs driving functions using two wheels, featuring excellent mobility due to its simple structure and wheel-driven system. However, when a long longitudinal structure is applied to increase space efficiency, challenges may arise in balance control and slope entry. In this study, a sliding mechanism and Model Predictive Control (MPC) were applied to achieve balance and driving control for a robot with a long longitudinal body. The system dynamics were analyzed using the Lagrangian method, and a reference for the sliding mechanism was generated to support balance control. Through Gazebo simulations, the performance of the MPC algorithm was verified, confirming that the robot could reach a stable balance state through Swing-up motion and maintain balance consistently. Additionally, stable driving performance was demonstrated in slope driving tests. We conducted experiments by applying the same algorithm to the actual robot, confirming that it successfully performed stable balance control and slope driving control in real-world environments. © ICROS 2025.

关键词： Model predictive control

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Evaluation of optimal responses in Monel 400 alloy using computer based unconventional machining process

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Interactions 2025年第1期246卷 1-11页

作者： Manohar, Gunaselvi Chandrasekar, G. Radhakrishnan, G. Raj, P. Anantha Christu Ram, S. Department of Electronics and Instrumentation Engineering Easwari Engineering College Chennai India Department Mechanical Engineering PSNA College of Engineering and Technology Dindigul India Department of Electrical and Electronics Engineering Sri Krishna College of Engineering and Technology Tamilnadu Coimbatore India Division of Robotics Engineering Karunya Institute of Technology and Sciences Tamilnadu Coimbatore India Department of Mechanical Engineering Gokaraju Rangaraju Institute of Engineering and Technology Hyderabad India

The unconventional machining is an essential role in metal forming process. The dimensional accuracy and super finish are the main features of modern machining methods. Electric discharge machining is a competent process to any materials and composites. In this article is used to machining characteristics of Monel 400 alloy with monitored by computer networks. The response variables are mainly depending on input variables and their levels. Taguchi method is utilized to evaluate the optimal control factors. The mean and SN ratio is evaluated by based on the criteria of the responses. The involvement of control variables to the responses have been validated by variance analysis. The best possible MR was attained at a discharge current of 40 A, pulse on time of 140µs, and spark voltage of 25 *** finest RTW and SR was occurred at a discharge current of 40 A, pulse on time of 140µs, and spark voltage of 20 V. The scope of the work is to maximize the metal removal and minimize the tool wear. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Metal forming

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How Sure is the Driver? Modelling Drivers’ Confidence in Left-Turn Gap Acceptance Decisions

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Computational Brain and Behavior 2024年第3期7卷 437-456页

作者： Bontje, Floor Zgonnikov, Arkady Department of Cognitive Robotics Faculty of Mechanical Engineering Delft University of Technology

When a person makes a decision, it is automatically accompanied by a subjective probability judgment of the decision being correct, in other words, a confidence judgment. A better understanding of the mechanisms responsible for these confidence judgments could provide novel insights into human behavior. However, so far confidence judgments have been mostly studied in simplistic laboratory tasks while little is known about confidence in naturalistic dynamic tasks such as driving. In this study, we made a first attempt of connecting fundamental research on confidence with naturalistic driver behavior. We investigated the confidence of drivers in left-turn gap acceptance decisions in a driver simulator experiment (N = 17). We found that confidence in these decisions depends on the size of the gap to the oncoming vehicle. Specifically, confidence increased with the gap size for trials in which the gap was accepted, and decreased with the gap size for rejected gaps. Similarly to more basic tasks, confidence was negatively related to the response times and correlated with action dynamics during decision execution. Finally, we found that confidence judgments can be captured with an extended dynamic drift–diffusion model. In the model, the drift rate of the evidence accumulator as well as the decision boundaries are functions of the gap size. Furthermore, we demonstrated that allowing for post-decision evidence accumulation in the model increases its ability to describe confidence judgments in rejected gap decisions. Overall, our study confirmed that principles known from fundamental confidence research extend to confidence judgments in dynamic decisions during a naturalistic task. © The Author(s) 2024.

关键词： Confidence Decision making Driver behavior Evidence accumulation Metacognition

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Energy-exergy and exergoeconomic analysis of a hydrogen-enriched spark-ignition engine fueled with premium gasoline-ethanol blends

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International Journal of Hydrogen Energy 2025年 137卷 689-709页

作者： Kumbhar, Sujit Khot, Sanjay Bhapkar, Udaysinh Patil, Vishal Singh, Paramvir Husainy, Avesahemad Department of Technology Shivaji University Kolhapur India Automation and Robotics Department Sharad Institute of Technology College of Engineering Yadrav Ichalkaranji India Mechanical Engineering Department Sharad Institute of Technology College of Engineering Yadrav Ichalkaranji India Kolhapur India Department of Mechanical Engineering National Institute of Technology Agartala India

Hydrogen is a promising alternative fuel for internal combustion engines due to its renewable nature, low emissions, and superior combustion performance. In the current research, the effects of hydrogen enrichment were studied on the thermodynamic analysis of spark ignition engines using premium gasoline-ethanol blends. The blends were prepared with a partial addition of ethanol (10 % and 20 % by volume) in premium gasoline and hydrogen was injected during combustion for 2, 3, 4, and 5 μs. The testing was done on the varying engine speeds at 1500, 2000, 2500, 3000, and 3500 rpm. Energy and exergy analyses, entropy generation, and sustainability index were assessed for different fuel blends and contrasted with premium gasoline. The brake thermal efficiency and exergy efficiency were found maximum at 2500 rpm engine speed for all tested fuel blends. The BTE of E10H5 fuel blend is 18 % higher than premium gasoline and the exhaust gas energy of the E10H5 fuel blend is 12 % higher than premium gasoline at 2500 rpm. Among all tested fuel blends, the E10H5 fuel blend showed prominent results. The present experimental investigation focuses on energy-exergy analyses of premium gasoline-ethanol blends with enriched hydrogen at different injection times to assess the potential fuel blends. These blends will help to reduce dependency on conventional fossil fuels by enriching hydrogen without modification of the engine. © 2025 Hydrogen Energy Publications LLC

关键词： Hydrogen engines

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A possible solution for noise attenuation material for urban buses: The downtown São Paulo case study

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Noise and Vibration Worldwide 2025年第3期56卷 137-147页

作者： Monteiro, Elvis C Avila, Antonio F Division Stellantis Betim Brazil Mechanical Engineering Graduate Studies Program Universidade Federal de Minas Gerais Belo Horizonte Brazil Department of Mechanical Engineering and Mechanical Engineering Graduate Studies Program Universidade Federal de Minas Gerais Belo Horizonte Brazil

Urban buses, particularly in large cities, are exposed to significant noise pollution. This paper presents a new family of materials at the micro/nano level designed for urban noise attenuation, specifically for application in urban buses. Melamine foam is combined in series with nanomembranes, creating a composite material that functions as a Helmholtz resonator. As sound waves pass over the nanomembranes, they are disturbed, and the sound resonates within the melamine foam. This interaction reduces the energy of the sound waves and enhances the noise absorption coefficient. In ten cases studied, the average sound absorption coefficient was approximately 89%, with peak frequencies ranging from 2400 Hz to 4300 Hz. The average thickness of the nanomembranes was around 5.0 µm, while the melamine foam had a thickness of 13 mm. The mean noise reduction achieved was about 11 dB, which depends on factors such as the morphology, thickness, and pore size of the nanomembranes. A case study conducted in downtown São Paulo demonstrated that applying these materials to urban buses can significantly reduce interior noise levels. Finally, the proposed system is fully scalable and adaptable for various applications where acoustic insulation is required. © The Author(s) 2025.

关键词： Noise pollution

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