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11th European Workshop on Structural Health Monitoring, EWSHM 2024

作者： Raorane, Siddhesh Ambrozinski, Lukasz Stepinski, Tadeusz Packo, Pawel Department of Robotics and Mechatronics Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Krakow30-059 Poland

The employment of guided waves for structural health monitoring applications has attracted substantial attention in recent years. Piezoelectric transducers are frequently employed in these systems for elastic wave generation and acquisition. Their dynamic properties, i.e., direction-dependent frequency characteristics such as directivity patterns, are an important feature for designing a reliable monitoring strategy. Although analysis of the transducer directivity pattern can be performed using finite element models, these usually tend to be computationally very expensive, especially for parametric and optimization studies. In this paper, a semi-analytical framework is proposed that can predict the far-field directivity patterns of complex transducers of arbitrary shape and structure mounted on a substrate. The framework described in this paper integrates analytical far-field predictions with a local finite element model evaluating the traction field produced by the transducer. Consequently, the FE model accurately captures near-field responses, whereas the analytical component predicts the far-field responses. The implementation of this semi-analytical framework requires the development of analytical and numerical approaches. The former includes computation of dispersion curves of the inspected plate, the stress and displacement profiles of wave modes, and ultimately, the excitability relations, while the latter includes estimation of the traction field between the transducer and the plate using the FE model. Owing to the popularity of piezoelectric macro-fiber composite (MFC) transducers, in this paper, we apply the proposed method to predict the directivity patterns of MFC M2807-P2 transducer. To validate the reliability of the proposed method, the predicted patterns are compared with experimental results obtained using Laser Doppler Vibrometer. © 2024 11th European Workshop on Structural Health Monitoring, EWSHM 2024. All rights reserved.

关键词： Piezoelectric transducers

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Center-of-gravity velocity estimation using lower limb muscle forces during walking

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Journal of Biomechanical Science and engineering 2024年第3期19卷 1-16页

作者： SAITO, Ayuko NOYORI, Shohei TOYOFUKU, Takato KOBAYASHI, Yoshikazu KIZAWA, Satoru Department of Mechanical Science and Engineering Kogakuin University 2665-1 Nakanomachi Hachioji Tokyo192-0015 Japan Department of Mechanical Engineering and Robotics National Institute of Technology Akita College 1-1 Iijima-Bunkyo-cho Akita Akita011-8511 Japan

This study proposes a gait model that describes the relation between the lower limb muscle forces and the center-of-gravity (CoG) velocity in the forward, vertical, and lateral directions. Based on the CoG velocity and lower limb muscle forces obtained from gait measurements, the unknown parameters in the gait model are identified using a Kalman filter. The CoG velocity is estimated by applying the identified parameters and lower limb muscle forces to the model. After the accuracy of the proposed model is verified, the model is used to examine the relationship between the lower limb muscle groups used to construct the gait model and the gait velocity in three directions. The estimated CoG velocity in the vertical and lateral directions is more accurate than that in the forward direction. The analysis results indicate that the fluctuation of the CoG trajectory in the vertical and lateral directions can be accurately expressed using the 10 muscle forces for each leg used in the model. The obtained results can be used to quantitatively evaluate CoG sway. The proposed model can be applied in medical care and sports medicine. © (2024) The Japan Society of mechanical Engineers. This is an open access article under the terms of the Creative Commons Attribution 4.0 International license (https://***/licenses/by/4.0/).

关键词： Kalman filters

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Development and Experimental Evaluation of an Endoscopic Capsule Robot Equipped With a Fail-safe Biopsy Mechanism 12

Development and Experimental Evaluation of an Endoscopic Cap...

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12th RSI International Conference on robotics and Mechatronics, ICRoM 2024

作者： Zarifi Khameneh, M.R. Tolouei, Z. Yousefi, M. Pishkenari, H. Nejat Alasty, A. Sharif University of Technology Micro/Nano Robotics Laboratory Department of Mechanical Engineering Tehran Iran Sharif University of Technology Department of Mechanical Engineering Tehran Iran

ISBN: (纸本)9798331529734

Endoscopic capsule robots (ECRs) have introduced feasible and painless gastrointestinal diagnostics to endoscopic procedures. To further enhance the capability of these revolutionary devices, many research groups have attempted to equip ECRs with functions such as active locomotion, drug delivery, and biopsy. This study addresses the challenges related to the biopsy functionality of ECRs by introducing a remote biopsy mechanism adapted from the magnetic spring concept. The mechanism consists of one axial permanent magnet (PM) fixed inside the ECR's body, a radial PM free to translate along the device length and rotate perpendicular to its magnetization direction, and conventional biopsy forceps. The presented ECR can locomote directly using external gradient magnetic fields or through rotation via external uniform magnetic fields. Additionally, the proposed biopsy mechanism ensures reliable actuation and a fail-safe design. To evaluate the performance of this design, a prototype with a diameter of 12 mm and a length of 30 mm was fabricated, and its functionality in active rotational locomotion, orientation control, and biopsy actuation was demonstrated through experiments. © 2024 IEEE.

关键词： Endoscopy

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Automatic Cataract and Cholesterol Detection System Based on Recurrent Neural Network (RNN): A Comparison with Convolutional Neural Network (CNN) and Siamese Neural Network (SNN) 1

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19th International Conference of Intelligent Unmanned Systems, ICIUS 2023

作者： Lie, Zener S. Widodo, Jatmiko A. F. Hanesi, Isabel K. P. Moningka, Matthew R. N. Mariana, Y. Astuti, Winda Akmeliawati, Rini Automotive and Robotics Program Computer Engineering Department BINUS ASO School of Engineering Bina Nusantara University Jakarta11480 Indonesia Product Design program Industrial Engineering Department BINUS ASO School of Engineering Bina Nusantara University Jakarta11480 Indonesia Robotics and Automation Research Group School of Electrical and Mechanical Engineering The University of Adelaide North Terrace Campus Adelaide Australia

ISBN: (数字)9789819765911

ISBN: (纸本)9789819765904

In Indonesia, the majority of blindness cases, approximately 81%, are attributed to cataract. Additionally, 35% of the population has higher cholesterol levels than the standard normal range. The lack of specialized medical equipment, such as the slit-lamp (Ruparelia in Dalhousie Med J 49(1), [1]) bio-microscope, and trained professionals, especially in rural areas, make it difficult to detect these conditions through eye examinations. To address this issue, a supervised machine learning method, the Recurrent Neural Network (RNN), has been utilized to create an iris scanner system that can identify cataract and high cholesterol in a patient. This system will classify eyes into three categories, i.e., cataract, high cholesterol, and normal iris. The computer simulations indicate that this technique is more accurate and requires less training time compared to the existing Convolutional Neural Network (ANN) and Siamese Neural Network (SNN)-based method, while achieving 100% accuracy. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Convolutional neural networks

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Bending results of graphene origami reinforced doubly curved shell

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Defence Technology（防务技术） 2024年第5期35卷 198-210页

作者： Nan Yang Yunhe Zou Mohammad Arefi School of Architecture and Civil Engineering Qiqihar UniversityQiqihar 161006HeilongjiangChina School of Mechanical Engineering Inner Mongolia University of TechnologyHohhot 010051Inner MongoliaChina Inner Mongolia Key Laboratory of Special Service Intelligent Robotics Hohhot 010051Inner MongoliaChina Faculty of Mechanical Engineering Department of Solid MechanicsUniversity of KashanKashan87317-51167Iran

The present work investigates higher order stress,strain and deformation analyses of a shear deformable doubly curved shell manufactures by a Copper(Cu)core reinforced with graphene origami auxetic metamaterial subjected to mechanical and thermal *** effective material properties of the graphene origami auxetic reinforced Cu matrix are developed using micromechanical models cooperate both material properties of graphene and Cu in terms of temperature,volume fraction and folding *** principle of virtual work is used to derive governing equations with accounting thermal *** numerical results are analytically obtained using Navier's technique to investigate impact of significant parameters such as thermal loading,graphene amount,folding degree and directional coordinate on the stress,strain and deformation responses of the *** graphene origami materials may be used in aerospace vehicles and structures and defence technology because of their low weight and high stiffness.A verification study is presented for approving the formulation,solution methodology and numerical results.

关键词： Graphene origami Copper matrix Doubly curved Shear deformable Auxetic metamaterial

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Design and Development of an Internet of Things (IoT)-Based Application and System to Detect Stunting in Infants and Toddlers 10

Design and Development of an Internet of Things (IoT)-Based ...

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10th International HCI and UX Conference in Indonesia, CHIuXiD 2024

作者： Tiffany, Theresa Jeremia, James Lie, Zener Sukra Bina Nusantara University Binus Aso School of Engineering Automotive and Robotics Engineering Program Computer Engineering Department Jakarta11480 Indonesia

ISBN: (纸本)9798350380439

Currently, the process of monitoring children's growth in Indonesia relies on manual methods for collecting anthropometric data. These methods pose a risk of data recording errors. Additionally, the ratio of healthcare workers to children in Indonesia is 1:90, a significant disparity that hinders efforts to reduce the prevalence of stunting in the country. To support the third Sustainable Development Goal (SDG), which emphasizes 'Good Health and Well-being,' it is crucial to address issues in the stunting management process, from data collection to monitoring. The design and development of this iOS-based mobile application aim to assist in monitoring child growth and provide guidance and steps for prevention and treatment. Besides application development, it also involves the design and development of an Internet of Things (IoT) system to aid in the collection of children's anthropometric data. The research methodology includes studying stunting cases in Indonesia, anthropometric data calculation methods, stunting prevention and management steps, application design and development, automatic anthropometric data collection, and online data storage and transmission using IoT technology. The developed application and system have been tested and successfully integrated. The IoT device has an accuracy rate of 99.83% for weight measurement calibration and 98.68% for height or length measurement calibration. From the testing results of the child condition calculation method in the application, an accuracy rate of 100% was achieved. © 2024 IEEE.

关键词： Anthropometry

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Study on Structural Behavior of HVOF-Sprayed NiCr/Mo Coating

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1961-1970页

作者： Venkate Gowda, C. Nagaraja, T.K. Yogesha, K.B. Chand, R. Prem Manjunatha, M.C. Sollapur, Shrishali Manjunath, C.J. Pushpa, N. Department of Mechanical Engineering Atria Institute of Technology Karnataka Bengaluru560024 India Department of Mechanical Engineering JSS Academy of Technical Education Karnataka Bengaluru560060 India Department of Robotics and Artificial Intelligence Bangalore Institute of Technology Karnataka Bengaluru India Department of Mechanical Engineering Bangalore Institute of Technology Karnataka Bengaluru India Karnataka Bengaluru560069 India Department of Mathematics Reva University Karnataka Bengaluru India

This study investigates the structural behavior of HVOF-sprayed NiCr/Mo coating. The main objective of the coating is to improve the surface properties such as micro-cutting, cavity, and cracks, to avoid the corrosion, and to determine self-life and wear resistance at room temperature and high temperature also. The coating structures are very sensitive to processing and working conditions, to overcome all these aspects, the surface metal has to undergo microstructure analysis, porosity, microstructure hardness, and X-ray diffraction (XRD), and to improve mechanical properties of metal. HVOF spraying technique was used to deposit the coating on mild steel plate than the coated sample characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness, microindentation, and wear test. Moreover, we introduce the NiCr/Mo at different percentage levels (5%, 10%, and 15%) to evaluate the mechanical properties, to improve the performance and life span of the fracturing operations in aggressive conditions, which is essential in components replacement and economic savings in various industries such as aerospace, automotive, marine, etc. © The Institution of Engineers (India) 2024.

关键词： Chromium alloys

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Texture development and surface reconstruction of BiVO_(4)photoanode via one-pot hydrothermal reaction for enhanced photoelectrochemical water splitting

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Journal of Advanced Ceramics 2025年第3期14卷 133-141页

作者： Sung Won Hwang Yoo Jae Jeong Runfa Tan Indhujasri Saravanan Hyun Soo Han Dong Hoe Kim In Sun Cho Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea Department of Material Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Mechanical Engineering Stanford UniversityStanford 94305USA Department of Material Science&Engineering Korea UniversitySeoul 02841Republic of Korea Materials Science and Engineering Program University of Colorado BoulderBoulder 80303USA

The simultaneous optimization of the bulk and surface characteristics of photoelectrodes is essential to maximize their photoelectrochemical(PEC)*** report a novel one-pot hydrothermal synthesis of textured and surface-reconstructed BiVO_(4)photoanodes(ts-BVO),achieving significant improvements in PEC water *** controlling precursor molarity and ethylene glycol(EG)addition,we developed a stepwise dual reaction(SDR)mechanism,which enables simultaneous bulk texture development and surface *** optimized CoBi/ts-BVO photoanode exhibited a photocurrent density of 4.3 mA∙cm^(−2)at 1.23 V *** hydrogen electrode(RHE)with a high Faradaic efficiency of 98%under one sun *** with nontextured BiVO_(4),the charge transport efficiency increased from 8%to 70%,whereas the surface charge transfer efficiency improved from 9%to 85%.These results underscore the critical role of both bulk and surface engineering in enhancing PEC *** findings offer a streamlined approach for improving the intrinsic properties of photoanodes in solar water splitting.

关键词： BiVO_(4) hydrothermal texture surface reconstruction ethylene glycol(EG) photoelectrochemical water splitting

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The influence of Sodium Nitrate electrolyte on Aluminium scrapped wheel in the ECM process

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Interactions 2024年第1期245卷 1-9页

作者： Vijayakumar, S. Rao, T. V. Janardhana Karumuri, Srikanth Manickam, Selvaraj Andhra Pradesh Odalarevu 533210 India Department of ECE BVC College of Engineering Andhra Pradesh Rajahmundry533102 India Department of Mechanical Engineering Mizan Tepi University Tepi Campus 121 Ethiopia Department of Automation and Robotics IMPACT College of Engineering and Applied Sciences Bangalore India

Electrochemical Machining (ECM) stands out as a non-traditional method for intricately shaping materials. It operates on the principles of Faraday’s laws of electrolysis, where the weight of the substance generated during electrolysis correlates directly with the current flow, process duration, and equivalent weight of the deposited material. This research specifically investigates assessing the impact of Sodium Nitrate (NaNO3) electrolyte on machining Aluminium scrapped wheel. Three ECM input parameters voltage, electrolyte concentration, and duty cycle are varied across different levels. The study scrutinizes machining outputs, particularly Material Removal Rate (MRR) and overcut (OC), employing the Taguchi design methodology. Optimal process factors are presumed through SN ratio analysis and ANOVA is utilized to analyze the contribution of each parameter to the output characteristics. The results of the study suggest that MRR is improved, and an optimal configuration consists of 10 V voltage, 90% duty cycle, and 25 g/l electrolyte concentration. to minimize OC, 12 V voltage, 80% duty cycle, and 25 g/l electrolyte concentration are recommended. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Sodium nitrate

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Design of Fuzzy controller for position control of a magnetic catheter in uniform magnetic fields 11

Design of Fuzzy controller for position control of a magneti...

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11th RSI International Conference on robotics and Mechatronics, ICRoM 2023

作者： Bidgoli, Mohammadhossein Zahedi Pouya, Mohammad Hatami Pishkenari, Hossein Nejat Taheri, Alireza Sharif University of Technology Nano Robotics Laboratory Department of Mechanical Engineering Tehran Iran Sharif University of Technology Robotics Laboratory Department of Mechanical Engineering Tehran Iran

ISBN: (纸本)9798350308105

Magnetic catheters have gained popularity as a safer and more precise alternative to manually guided catheters, reducing X-ray exposure for medical professionals. However, achieving precise control of the catheter's tip remains a topic of debate. In this paper, we introduce a fuzzy controller designed to control the position of the magnetic catheter's tip with high accuracy in a controlled environment with a uniform magnetic field and a feeder mechanism, providing a 3DOF setup. We implemented the fuzzy controller using a dynamic Cosserat model of the magnetic catheter and conducted simulations to assess its performance. To evaluate the closed-loop system, two trajectory paths, one following a cubic pattern and the other a helical pattern, were provided as desired inputs to the closed-loop system using the proposed controller. Additionally, Gaussian-distributed noise was added to the feedback loop of the system. The Root Mean Square Error (RMSE) values for a catheter with a variable free length ranging from 3 to 5 cm for these two input trajectories were 0.96 mm and 0.86 mm, respectively. The simulation results indicated that the presented control system has the capability to accurately track various trajectories with high precision. © 2023 IEEE.

关键词： Mean square error

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