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Magnetic Force Enhanced Sustainability and Power of Cam-Based Triboelectric Nanogenerator

Research 2021年第1期2021卷 370-380页

作者： Hakjeong Kim Hee Jae Hwang Nghia Dinh Huynh Khanh Duy Pham Kyungwho Choi Dahoon Ahn Dukhyun Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYongin 17104Republic of Korea Department of Mechanical Engineering Korea Aerospace UniversityGoyang 10540Republic of Korea Division of Mechanical Engineering Kongju National UniversityCheonan 31080Republic of Korea

Since the first invention of triboelectric nanogenerators(TENGs)in 2012,many mechanical systems have been applied to operate TENGs,but mechanical contact losses such as friction and noise are still big obstacles for improving their output performance and ***,we report on a magnet-assembled cam-based TENG(MC-TENG),which has enhanced output power and sustainability by utilizing the non-contact repulsive force between the *** investigate the theoretical and experimental dynamic behaviors of MC-TENGs according to the effects of the contact modes,contact and separation times,and contact forces(i.e.,pushing and repulsive forces).We suggest an optimized arrangement of magnets for the highest output performance,in which the charging time of the capacitor was 2.59 times faster than in a mechanical cam-based TENG(C-TENG).Finally,we design and demonstrate a MC-TENG-based windmill system to effectively harvest low-speed wind energy,~4 m/s,which produces very low ***,it is expected that our frictionless MC-TENG system will provide a sustainable solution for effectively harvesting a broadband of wasted mechanical energies.

关键词： friction magnets generator

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Comparative Analysis of AD8232 and BioAmp EXG Pill Analog Front-End Devices in ECG Signal Processing 11

Comparative Analysis of AD8232 and BioAmp EXG Pill Analog Fr...

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11th IEEE Conference on Systems, Process and Control, ICSPC 2023

作者： Mamee, Tanakrit Manorost, Panason Chamroon, Chakkapong Thunsiri, Kittiya Chiang Mai University Program in Mechanical Engineering Department of Mechanical Engineering Chiang Mai Thailand Ku Leuven University Faculty of Bioscience Engineering Leuven Belgium Biomedical Engineering Institute Chiang Mai University Chiang Mai Thailand Chiang Mai University Department of Mechanical Engineering Chiang Mai Thailand Chiang Mai University Faculty of Engineering Chiang Mai Thailand

ISBN: (纸本)9798350340860

The development of compact portable ECG monitoring devices often entails the pursuit of downsizing measurement systems. This objective frequently involves additional efforts, such as custom PCB fabrication for analog front-end systems and exploration of alternative electrode types and configurations. In this study, we investigate the feasibility of using the BioAmp EXG Pill, a miniature commercial analog front-end board, in comparison to the well-established AD8232. Our analysis focuses on comparing ECG signals from five adult subjects, examining both frequency components using the welch estimation method and ECG parameters extracted from time-domain signals. The results reveal that both devices provided similar outcomes in time-domain measurements, with a slightly lower standard deviation observed in the AD8232. In terms of spectral density, both devices proficiently captured low-frequency components within the 0-3 Hz range. However, in higher-frequency domains, the AD8232 demonstrated superior capability in capturing finer frequency details. © 2023 IEEE.

关键词： Electrocardiograms

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Action tremor features discovery for essential tremor and Parkinson's disease with explainable multilayer BiLSTM

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Computers in Biology and Medicine 2024年 180卷 108957页

作者： Teo, Yu Xuan Lee, Rui En Nurzaman, Surya Girinatha Tan, Chee Pin Chan, Ping Yi Department of Electrical & Robotics Engineering School of Engineering Monash University Malaysia Malaysia Department of Mechanical Engineering School of Engineering Monash University Malaysia Bandar Sunway Malaysia

The tremors of Parkinson's disease (PD) and essential tremor (ET) are known to have overlapping characteristics that make it complicated for clinicians to distinguish them. While deep learning is robust in detecting features unnoticeable to humans, an opaque trained model is impractical in clinical scenarios as coincidental correlations in the training data may be used by the model to make classifications, which may result in misdiagnosis. This work aims to overcome the aforementioned challenge of deep learning models by introducing a multilayer BiLSTM network with explainable AI (XAI) that can better explain tremulous characteristics and quantify the respective discovered important regions in tremor differentiation. The proposed network classifies PD, ET, and normal tremors during drinking actions and derives the contribution from tremor characteristics, (i.e., time, frequency, amplitude, and actions) utilized in the classification task. The analysis shows that the XAI-BiLSTM marks the regions with high tremor amplitude as important in classification, which is verified by a high correlation between relevance distribution and tremor displacement amplitude. The XAI-BiLSTM discovered that the transition phases from arm resting to lifting (during the drinking cycle) is the most important action to classify tremors. Additionally, the XAI-BiLSTM reveals frequency ranges that only contribute to the classification of one tremor class, which may be the potential distinctive feature to overcome the overlapping frequencies problem. By revealing critical timing and frequency patterns unique to PD and ET tremors, this proposed XAI-BiLSTM model enables clinicians to make more informed classifications, potentially reducing misclassification rates and improving treatment outcomes. © 2024 The Authors

关键词： Classification (of information)

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Omnichannel Retail in Small and Medium-Sized Enterprises: Insights from Indonesia

Omnichannel Retail in Small and Medium-Sized Enterprises: In...

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2023 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2023

作者： Febriani, Atik Sopha, Bertha Maya Wibisono, Muhammad Arif Universitas Gadjah Mada Department of Mechanical and Industrial Engineering Yogyakarta Indonesia Institut Teknologi Telkom Purwokerto Industrial Engineering Program Faculty of Industrial Engineering and Design Purwokerto Indonesia

ISBN: (纸本)9798350323153

An omnichannel retail strategy integrates multiple channels, enabling customers to shop across all available online and offline channels at the same time. This strategy is required to overcome different obstacles that develop as a result of changes in the retailer's business environment. This study aims to provide an overview of the extent to which SMEs in Indonesia implement an omnichannel strategy. Omnichannel retail implementation in SMEs has shown positive developments in recent years. They recognize the importance of providing a consistent and unified shopping experience across multiple channels. In this context, the marketplace is essential for SMEs to expand their reach of customers in various locations. However, despite positive developments, there are still some challenges to implementing omnichannel for SMEs in Indonesia. These challenges include dynamic changes in consumer behavior, limited staff capabilities, and the mindset of SME leaders or owners. © 2023 IEEE.

关键词： multichannel omnichannel retail SMEs strategy

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Improving Control Theory Education Through Face-to-Face Implementation of a Mobile robotics Methodology 16

Improving Control Theory Education Through Face-to-Face Impl...

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16th Brazilian Symposium on robotics and 15th Workshop on robotics in Education, SBR-WRE 2024

作者： Pastrana, M.A. Cuéllar Sánchez, William Humberto Mendoza-Peñaloza, Jose Santana, M.S. Muñoz, Daniel M. Department of Mechanical Engineering Mechatronics Graduate Program University of Brasilia DF Brasilia Brazil Faculty of Gama Electronics Engineering Undergraduate Program University of Brasilia DF Brasilia Brazil University of Federal District UDF DF Brasilia Brazil

ISBN: (纸本)9798350391084

Advances in information and communication technologies have significantly transformed engineering education. Virtual laboratories are increasingly adopted to enhance student interaction with control system simulations. The improved visualization and interaction capabilities of modern computers offer a more organic way to teach theoretical foundations. This paper describes the implementation of a methodology for teaching control theory that until now was entirely online in a face-to-face environment at the University of the Federal District in Brasilia, Brazil. This methodology utilizes virtual laboratories with CoppeliaSim, MATLAB, and the EVA mobile robot to teach control theory focused on single-input, single-output (SISO) systems for mobile robot tracking and obstacle avoidance applications. The results of the face-to-face implementation are compared to those of the fully online methodology, revealing that in-person teaching significantly enhances the quality of instruction. ©2024 IEEE.

关键词： MATLAB

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PID-fuzzy switching-based strategy to heading control for remote operated vehicle

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Neural Computing and Applications 2024年 1-17页

作者： Xie, Baolong He, Shuping Cao, Xiang Wang, Honghai Stojanovic, Vladimir Shi, Kaibo School of Electrical Engineering and Automation Anhui University Hefei230039 China School of Artificial Intelligence Anhui University Hefei230039 China School of Computing and Artificial Intelligence Chaohu University Chaohu238024 China Department of Automatic Control Robotics and Fluid Technique Faculty of Mechanical and Civil Engineering University of Kragujevac Kraljevo36000 Serbia School of Electronic Information and Electrical Engineering Chengdu University Chengdu610106 China

Accurate heading control is the premise for underwater vehicles to complete underwater operations. In order to improve the performance of heading control, this paper proposes a heading control strategy based on PID-fuzzy switching. First, the force analysis of the steering motion was carried out to derive the dynamics model of the steering motion. Then, the whole heading control process is divided into two phases, steering phase and holding phase. Fuzzy control is used in the steering phase, and PID control is used in the holding phase. By setting the automatic switching switch, the control system can switch freely between the two to meet the needs of system adjustment under different errors. Finally, the performance of the established heading control system is verified through motion control simulations and pool experiments, and the proposed control strategy is compared with other methods. The results show that the control strategy can effectively achieve ROV heading control with good steady-state accuracy, and the overall performance has been greatly improved. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Fuzzy control

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Prediction of Emission Characteristics of Spark Ignition (S.I.) Engines with Premium Level Gasoline-Ethanol-Alkane Blends Using Machine Learning 13th

Prediction of Emission Characteristics of Spark Ignition (S....

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13th International Advanced Computing Conference, IACC 2023

作者： Kumbhar, Sujit Khot, Sanjay Jujare, Varsha Patil, Vishal Husainy, Avesahemad Shedbalkar, Koustubha Department of Technology Shivaji University Maharashtra Kolhapur416004 India Department of Automation and Robotics Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India Department of Computer Science and Engineering Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India Department of Mechanical Engineering Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India Department of Electrical Engineering Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India Department of Mechanical Engineering Sharad Institute of Technology College of Engineering Yadrav Maharastra Inchalkaranji416121 India

ISBN: (纸本)9783031566998

In the current research work, a single cylinder spark (S.I)ignition engine were used for investigations of premium level gasoline-ethanol-alkane experimentally with different operating conditions e.g. variation spark ignition timing. The Engine Lab and PE3 software were used for engine control and data acquisition system. The data obtained after experimentation were used to predict the engine emissions for different operating conditions. The engine emission characteristics were predicted using three machine learning algorithmsviz linear regression, decision tree and random forest. It was found that emissions characteristics such as carbon monoxide, unburnt hydrocarbon found to be minimum for 24°bTDC experimentally as well as predicted by machine learning algorithms with different operating conditions than other spark timing positions such as 15°, 18°, 21°, 27°, 30° bTDC. All three machine learning algorithms gave better results but the random forest algorithm were more accurate than linear regression and decision trees. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Paraffins

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MOSFET Based Active Rectifier Design in Wireless Capacitive Power Transfer for Electric Vehicles 1

MOSFET Based Active Rectifier Design in Wireless Capacitive ...

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1st International Conference on Smart Mechatronics, ICSMech 2024

作者： Dragon, Klemens Raphael Lie, Zener Sukra Muharam, Aam Ika, Juan Luciano Perdana, Muhamad Arjuna Amin Hapid, Abdul Binus Aso School of Engineering Bina Nusantara University Automotive and Robotics Program Computer Engineering Department Jakarta Indonesia Badan Riset dan Inovasi Nasional Research Center for Transportation Technology Jawa Barat Bandung Indonesia

ISBN: (纸本)9798350368918

While the rise of electric vehicles reflects a push for clean energy as envisioned by international agreements like the Paris Agreement, wireless charging's convenience can overcome limitations and hasten their adoption, making it a strategic step alongside regulations such Permenhub No. 15/2022 and SDG 9 'Industry, Innovation, and Infrastructure' for cleaner air and sustainable transportation. The aim is to convert the high frequency AC voltage from the coupling capacitor into a stable DC voltage. Further increase the system sensitivity to the load variations, by designing a MOSFET based active rectifier. By changing load parameters, the accuracy of PFC adaptation to the battery State of Charge (SOC) obtained is at 98% with 2% tolerance for errors. It is concluded that the research is said to be successful because it has met the parameters of general research hypothesis where the system is able to convert high frequency AC voltage into a stable DC voltage. © 2024 IEEE.

关键词： State of charge

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Tribology Performance of Silica Nanoparticles as Lubricant Additives in a Reciprocating Four-Stroke Engine Motorcycle

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International Journal of Automotive Technology 2023年第2期24卷 435-444页

作者： Lue, Yeou-Feng Hsiao, Wei-Liang Chen, Yi-Shun Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei10610 Taiwan Department of Industrial Education National Taiwan Normal University Taipei10610 Taiwan Department of Mechanical Engineering Asia Eastern University of Science and Technology Taipei22061 Taiwan

Lubricants, such as any types of greases and oils, are usually used to reduce the effect of friction. However, they also have multifunctions that increase the overall performance and application life. To clarify how lubricants decrease friction and reduce friction-related issues, this study evaluated the performance of specific fuel consumption and exhaust emissions (such as hydrocarbon, carbon monoxide, and particulate matter) of motorcycle with nanosilica (nano-SiO2) added to the original lubricant. Lubricants with 0.5, 1.5, 2.5, 3.5, and 4.5 wt.% nano-SiO2 were evaluated after testing their basic properties and conducting tribology tests. The lubricant with 3.5 wt.% nano-SiO2 was the best candidate for the four-stroke engine motorcycle experiments. The results of the tribology experiment with nano-SiO2 lubricant showed that the abrasion loss corresponding to the 3.5 wt.% nano-SiO2 lubricant decreased by an average of 42.43 %. Overall, the 3.5 wt.% nano-SiO2 lubricant improved the effect of lubrication. The primary focus of the current study was the development of nano-SiO2 lubricant technology for applications in industry environments. © 2023, The Korean Society of Automotive Engineers.

关键词： Tribology

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Parametric Identification of the Mathematical Model of a Mobile Robot with Mecanum Wheels 27th

Parametric Identification of the Mathematical Model of a Mo...

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27th International Conference on Automation, AUTOMATION 2023

作者： Hendzel, Zenon Kolodziej, Maciej Faculty of Mechanical Engineering and Aeronautics Department of Applied Mechanics and Robotics Rzeszow University of Technology Rzeszow Poland Doctoral School of Engineering and Technical Sciences at the Rzeszow University of Technology Rzeszow Poland

ISBN: (纸本)9783031258435

In this work, on the basis of the parametric identification process, a new mathematical model of an industrial robot with mecanum wheels was developed. Based on the prediction error, a synthesis of the parameters identification of the mathematical model of the robot was performed. The gradient method was used to determine the values of the mathematical model parameters. The aim of the parametric identification process was to formulate a mathematical model for the synthesis of control algorithms. We use a continuous-time formulation and the parametric identification task is understood as the selection of the best mathematical model in a given class of models. Numerous experimental studies have been carried out on typical motion trajectories used in mobile robotics. Experimental and validation studies in numerous experiments have shown obtaining correct values of the identified parameters of the mathematical model of the robot. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Mecanum wheels Mobile robot Parametric identification

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