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

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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Improvement of Localization Algorithm for Indoor and Outdoor Navigation of Autonomous Robots

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Journal of Institute of Control, robotics and Systems 2025年第5期31卷 502-509页

作者： Cho, Joonhyuk Kim, Bongsang Moon, Heechang Industrial Convergence Interdepartmental Program Autonomous Vehicle Intelligent Robotics The Graduate School of Hongik University Korea Republic of Mechanical & System Design Engineering Hongik University Korea Republic of

Location estimation for waypoint-based autonomous driving robots primarily relies on SLAM (Simultaneous Localization and Mapping) and GNSS (Global Navigation Satellite System) technologies. GNSS performs well in open areas but struggles with signal issues, while SLAM offers high accuracy in feature-rich environments but faces challenges in open spaces. This study integrates SLAM and GNSS, enabling seamless switching between systems when one encounters difficulties. The combined system ensures consistency by aligning coordinate systems and directional data. Experiments in indoor, forest, and open environments demonstrate that the switching algorithm enables stable autonomous driving in diverse conditions, effectively leveraging the strengths of both systems. © ICROS 2025.

关键词： Global positioning system

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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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Analysis of Automation in Foundries for Transforming Production Efficiency, Quality Control, and Operational Resilience 2

Analysis of Automation in Foundries for Transforming Product...

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2nd International Conference on Machine Learning and Autonomous Systems, ICMLAS 2025

作者： Bhagyanathan, C. Sarvesh, J. Vishal, G. Rithvik, R. Sri Ramakrishna Engineering College Department of Mechanical Engineering Coimbatore India Sri Ramakrishna Engineering College Department of Robotics and Automation Coimbatore India

ISBN: (数字)9798331505745

ISBN: (纸本)9798331505745

The foundry industry, a cornerstone of manufacturing, has undergone significant transformations due to the integration of automation technologies. This survey paper examines the evolution of automation in foundries, exploring its historical development, key adoption drivers, and the ongoing challenges faced by traditional operations. Technological advancements driving this change include the Industrial Internet of Things (IIoT), robotics, artificial intelligence (AI), machine learning (ML), and cyber-physical systems (CPS), such as digital twins. Through case studies, the paper illustrates practical implementations of these technologies, such as IoT-enabled monitoring, robotics in core making and molding, AI-driven defect detection, and CPS integration in smart foundries. The advantages of automation are emphasized, including increased productivity, improved quality control, energy efficiency, sustainability, and enhanced workplace safety. Despite these benefits, the adoption of automation faces significant hurdles, such as high initial investment costs, integration with legacy systems, skill gaps, and cybersecurity concerns. The paper also identifies future trends, including the rise of collaborative robotics (cobots), edge computing, 5G technologies, and the vision for fully autonomous foundries. This comprehensive survey offers valuable insights into the current state of foundry automation, its transformative potential, and future directions for researchers and industry stakeholders seeking to leverage these advancements for operational excellence. © 2025 IEEE.

关键词： Coremaking

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Negative Stiffness Mechanism on An Asymmetric Wave Energy Converter by Using A Weakly Nonlinear Potential Model

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China Ocean engineering 2024年第4期38卷 689-700页

作者： Sunny Kumar POGULURI Dongeun KIM Yoon Hyeok BAE Department of Ocean Engineering IIT MadrasChennaiIndia Multidisciplinary Graduate School Program for Wind Energy Jeju National UniversityJejuRepublic of Korea Mechanical and System Design Engineering Hongik UniversitySeoulRepublic of Korea

Salter's duck,an asymmetrical wave energy converter(WEC)device,showed high efficiency in extracting energy from 2D regular waves in the past;yet,challenges remain for fluctuating wave *** can potentially be addressed by adopting a negative stiffness mechanism(NSM)in WEC devices to enhance system efficiency,even in highly nonlinear and steep 3D waves.A weakly nonlinear model was developed which incorporated a nonlinear restoring moment and NSM into the linear formulations and was applied to an asymmetric WEC using a time domain potential flow *** model was initially validated by comparing it with published experimental and numerical computational fluid dynamics *** current results were in good agreement with the published *** was found that the energy extraction increased in the range of 6%to 17%during the evaluation of the effectiveness of the NSM in regular *** irregular wave conditions,specifically at the design wave conditions for the selected test site,the energy extraction increased by 2.4%,with annual energy production increments of approximately *** findings highlight the potential of NSM in enhancing the performance of asymmetric WEC devices,indicating more efficient energy extraction under various wave conditions.

关键词： asymmetric wave energy converter negative stiffness mechanism weakly nonlinear potential flow power

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Ultrafast Miniature Robotic Swimmers with Upstream Motility

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Cyborg and Bionic Systems 2023年第1期4卷 452-459页

作者： Yibin Wang Hui Chen Junhui Law Xingzhou Du Jiangfan Yu School of Science and Engineering The Chinese University of Hong KongShenzhenChina ShenzhenInstitute of Artificial Intelligence and Robotics for Society ShenzhenChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

With the development of materials science and micro-nano fabrication techniques,miniature soft robots at millimeter or submillimeter size can be manufactured and actuated *** small-scaled robots have the unique capability to access hard-to-reach regions in the human body in a noninvasive *** date,it is still challenging for miniature robots to accurately move in the diverse and dynamic environments in the human body(e.g.,in blood flow).To effectively locomote in the vascular system,miniature swimmers with upstream swimming capability are ***,we design and fabricate a miniature robotic swimmer capable of performing ultrafast swimming in a fluidic *** maximum velocity of the swimmer in water is 30 cm/s,which is 60 body ***,in a tubular environment,the swimmer can still obtain a swimming velocity of 17 cm/*** swimmer can also perform upstream swimming in a tubular environment with a velocity of 5 cm/s when the flow speed is 10 cm/*** ultrasound-guided navigation of the swimmer in a phantom mimicking a blood vessel is also *** work gives insight into the design of agile undulatory milliswimmers for future biomedical applications.

关键词： millimeter upstream environments

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Development of Video Stabilization Technology in Extreme Environments Using Lidar-inertial Odometry

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Journal of Institute of Control, robotics and Systems 2025年第1期31卷 61-67页

作者： Yoon, Yeong-In Suh, Hyeong-Seok Shin, Gwan-Jun Lim, Jong-Woo Department of Mechanical Engineering Seoul National University Korea Republic of Interdisciplinary Program in Artificial Intelligence Seoul National University Korea Republic of

This study proposes designing and applying a video stabilization algorithm using LIDAR-inertial odometry (LIO). The performance of the video stabilization function was validated in narrow, low-light environments using a small robot. A unique camera pose estimation method based on LIO has been introduced and integrated with the camera system in this work to not only overcome the limitations of image feature-based camera pose estimation but also address the issues arising from camera sensors. Thus, this strategy allows the practical implementation of a robust camera stabilization algorithm even in extreme environments. The proposed approach is resilient to the differing scan rates of the LIDAR system and the camera, and it enhances usability by filtering noise from the LIO. Furthermore, it requires less computational resources compared to traditional image feature extraction-based methods. This technology can substantially improve the operational convenience for robot operators, especially in scenarios where robots equipped with various sensors are deployed in extreme environments. © ICROS 2025.

关键词： image perspective transformation lidar-inertial odometry video stabilization

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Fabrication of Microchannels on Aluminium-Coated Polymethyl Methacrylate (PMMA) Using a Low Power CO2 Laser

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Lasers in Manufacturing and Materials Processing 2024年第4期11卷 868-886页

作者： Okello, Job Lazarus El-Bab, Ahmed M. R. Fath Yoshino, Masahiko El-Hofy, Hassan A. Industrial and Manufacturing Engineering Department Egypt-Japan University of Science and Technology New Borg El-Arab City Egypt Mechatronics and Robotics Engineering Department Egypt-Japan University of Science and Technology New Borg El-Arab City Egypt Department of Mechanical Engineering Tokyo Institute of Technology Tokyo Japan Department of Production Engineering Faculty of Engineering Alexandria University Alexandria Egypt

The emergence of microfluidics as one of the most viable technologies for making various microfluidic devices has greatly enhanced miniaturization in several areas. The utilization of polymethyl methacrylate (PMMA) for making such devices using CO2 lasers has significantly increased due to the flexibility, time, and cost-effectiveness involved. However, attaining microchannels with accurate dimensions is a challenge because of the resulting defects like bulges, high heat-affected zone (HAZ), and surface roughness (Ra). This paper presents a novel attempt to engrave rectangular microchannels on PMMA substrates using a CO2 laser by coating the substrates with a thin layer of 1 μm thickness of 99.95% pure aluminium. The study investigated the effects of power, and speed on the quality of the microchannels. The fabrication was done on both coated and uncoated substrates under the same conditions and the results were compared. Power and speed ranged from 1.5 to 7.5 W and 5 to 17.5 mm/s, respectively. At 1.5 W and 17.5 mm/s, the aspect ratio increased by 37.16%. However, the microchannel depth, width, HAZ, and Ra all reduced by 44.66%, 59.68%, 29.44%, and 64.74% respectively. At 7.5 W and 5 mm/s, the aspect ratio increased by 81.46%. However, the microchannel depth, width, HAZ, and Ra all reduced by 21.84%, 54.64%, 32.36%, and 72.70% respectively. The coated substrates produced better microchannels than the uncoated ones. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Carbon dioxide lasers

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