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

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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Variable Length Multi-Objective Whale Optimization for Trust Aware Data Gathering in Wireless Sensor Network

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IEEE Access 2025年 13卷 32100-32121页

作者： Saad, Mohammed Ayad Jaafar, Rosmina Chellappan, Kalaivani Faculty of Engineering and Built Environment Department of Electrical Electronics and System Engineering Selangor Bangi43600 Malaysia Al-Kitab University Department of Medical Instrumentations Technique Engineering Kirkuk36001 Iraq Universitas Airlangga Biomedical Engineering Study Program Faculty of Science and Technology Surabaya60115 Indonesia

Efficient data collection in wireless sensor networks (WSNs) is crucial. While traditional approaches rely on stationary data sinks, the use of mobile sinks, like unmanned aerial vehicles (UAVs), has shown promise in enhancing data-gathering capabilities. However, existing methods often overlook the importance of trust, leaving the network susceptible to malicious or faulty nodes. To address this issue, we propose a novel trust-aware data-gathering algorithm, Variable Length Multi-Objective Whale Optimization Data Gathering (VLMOWO-DG). Our algorithm simultaneously optimizes energy consumption, delay, and trust while employing mobile sinks to collect data from sensor nodes. By considering trust as a key performance metric, we improve data reliability and security. The VLMOWO-DG algorithm introduces flexibility through variable-length solution representation and application-oriented operators, allowing for efficient exploration of the solution space. Simulation results demonstrate that our proposed algorithm significantly outperforms established benchmarks, NSGA-II and NSGA-III, in terms of domination and hypervolume. This leads to a remarkable improvement of 200% in data gathering performance. © 2015 The Authors.

关键词： Data collection

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On the use of deep learning for phase recovery

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Light(Science & Applications) 2024年第2期13卷 190-235页

作者： Kaiqiang Wang Li Song Chutian Wang Zhenbo Ren Guangyuan Zhao Jiazhen Dou Jianglei Di George Barbastathis Renjie Zhou Jianlin Zhao Edmund Y.Lam Department of Electrical and Electronic Engineering The University of Hong KongHong Kong SARChina School of Physical Science and Technology Northwestern Polytechnical UniversityXi’anChina Department of Biomedical Engineering The Chinese University of Hong KongHong Kong SARChina School of Information Engineering Guangdong University of TechnologyGuangzhouChina Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMAUSA

Phase recovery(PR)refers to calculating the phase of the light field from its intensity *** exemplified from quantitative phase imaging and coherent diffraction imaging to adaptive optics,PR is essential for reconstructing the refractive index distribution or topography of an object and correcting the aberration of an imaging *** recent years,deep learning(DL),often implemented through deep neural networks,has provided unprecedented support for computational imaging,leading to more efficient solutions for various PR *** this review,we first briefly introduce conventional methods for ***,we review how DL provides support for PR from the following three stages,namely,pre-processing,in-processing,and *** also review how DL is used in phase image ***,we summarize the work in DL for PR and provide an outlook on how to better use DL to improve the reliability and efficiency of ***,we present a live-updating resource(https://***/kqwang/phase-recovery)for readers to learn more about PR.

关键词： networks phase optics

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Effect of Cell Velocity on Dielectrophoretic Movement in Microchannel 14

Effect of Cell Velocity on Dielectrophoretic Movement in Mic...

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14th International Multi-Conference on Complexity, Informatics and Cybernetics, IMCIC 2023

作者： Ono, Ryuya Hashimoto, Shigehiro Minato, Takuma Biomedical Engineering Mechanical Engineering Kogakuin University Tokyo163-8677 Japan Biomedical Engineering Department of Mechanical Engineering Kogakuin University Tokyo163-8677 Japan

ISBN: (纸本)9781950492718

Dielectrophoresis was tried to be applied to the cell sorting technology in previous studies. In the present study, the movement of mouse myoblast cells flowing through the perpendicular electric field in the micro channel has been analyzed in vitro. A pair of asymmetric surface electrodes of titanium were manufactured by the photolithography technique: a triangular electrode with the tip angle of 0.35 rad, and a rectangular electrode of the flat edge as the reference. The cyclic alternating electric current of the square wave with the period of 0.3 μs was introduced between the surface electrodes to induce the asymmetric electric field perpendicular to the main flow direction. The suspension of cells (C2C12: mouse myoblast cell line) was injected into the flow channel, and the flow rate was controlled by the pressure head between the inlet and the outlet. The experimental result shows that the shifted dielectrophretic movement of the flowing cell in the direction perpendicular to the medium flow decreases with the increase of the flow velocity. © 2023 Proceedings IMCIC - International Multi-Conference on Complexity, Informatics and Cybernetics.

关键词： Electrophoresis

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Design of A Novel Statically Balanced Mechanism for End-effector-type Upper Limb Assistance

Design of A Novel Statically Balanced Mechanism for End-effe...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Meng, Qizhi Jiang, Ming Tang, Ruijie Kuo, Chin-Hsing Ceccarelli, Marco Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan Tsinghua University Department of Mechanical Engineering Beijing China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Partial loss of upper limb motor function is a typical sequela of stroke. To help such patients actively cope with daily challenges and improve their quality of life, limb functional assistances play important roles. To this end, this paper proposes a three-degree-of-freedom parallel mechanism, which can be used for human upper limb assistance. The base of the proposed mechanism is a circular track that can be attached to the waist of the human body. The mechanism consists of two chains containing parallelogram linkage, which presents good constraints for the mobile platform and facilitates the static balance design by adding springs, thereby providing reliable assistive functions and lightweight portability. The mobility of the proposed mechanism is analyzed via the screw theory, and it is verified that the mechanism generates the aimed movements. Then, the kinematic analysis of the mechanism is presented. Finally, the static balance design is carried out in detail, and the spring constants of the three added springs are calculated. The result shows that the mechanism can achieve perfect static balance. The proposed mechanism is expected to provide a potential candidate for assistive devices and be developed into a prototype providing upper limb assistance. © 2025 IEEE.

关键词： End effectors

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Distance Learning at the MS and PhD Levels in the Nuclear and Radiation engineering program, Nuclear and Applied Robotics, Materials Science and engineering and Walker department of mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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A COMPUTATIONAL FLUID DYNAMICS MODEL FOR INVESTIGATION OF MATERIAL FLOW IN A PERFUSION BIOREACTOR TOWARD OPTIMAL biomedical DESIGN OF CELL-LADEN SCAFFOLDS FOR BONE REGENERATION

A COMPUTATIONAL FLUID DYNAMICS MODEL FOR INVESTIGATION OF MA...

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ASME 2024 International mechanical engineering Congress and Exposition, IMECE 2024

作者： Rollins, Hannah Salary, Roozbeh Department of Biomedical Engineering Marshall University HuntingtonWV25755 United States Department of Mechanical & Industrial Engineering Department of Biomedical Engineering Marshall University HuntingtonWV25755 United States

ISBN: (纸本)9780791888605

In tissue engineering, once a scaffold has completed mechanical property testing, it must then undergo biological characterization which determines if the scaffold is capable of supporting cell *** perform biological tests, cells must be seeded onto a scaffold with the help of bioreactors, the four main types being: (i) rotating wall, (ii) spinner flask, (iii) compression, and (iv) perfusion *** perfusion bioreactors, a consistent flow of material is introduced (using a pump) into the inlet of the bioreactor chamber where multiple scaffolds of a disc geometry are ***, the intrinsic, complex interaction between the scaffolds and material flow as it goes through the bioreactor chamber affects the viability of the seeded stem ***, there is a need to identify consequential fluid dynamics phenomena governing the material flow in a perfusion *** this study, using a CFD model, the effects of critical scaffold parameters (such as the number of scaffolds, scaffold diameter, scaffold thickness, and number of pores) on the main flow properties (i.e., flow pressure, wall shear stress, and streamline velocity) influential in cell proliferation and bone development will be *** was observed that increasing the number of pores, in addition to decreasing the pore diameter had an adverse effect on the maximum forces occurring on the *** addition, changing the overall scaffold diameter did not appear to have as much as an effect as the other ***, it was observed that a decrease in porosity would lead to an increase in wall shear stress and consequently in cell ***, the outcomes of this study pave the way for optimal design, fabrication, and preparation of cell-laden bone scaffolds for treatment of bone fractures in clinical settings. Copyright © 2024 by ASME.

关键词： Computational fluid dynamics

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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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Turnaround Maintenance Projects in the Petrochemical Industry: A Bibliometric Review of Challenges and Opportunities 8

Turnaround Maintenance Projects in the Petrochemical Industr...

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8th International Conference on System Reliability and Safety, ICSRS 2024

作者： Maserumule, Lehoelere Masubelele, Flavia Nkosi, Mfundo University of Johannesburg Faculty of Engineering and Built Environment Department of Mechanical Engineering South Africa College of Science Engineering and Technology Department of Mechanical Bioresources and Biomedical Engineering University of South Africa South Africa

ISBN: (纸本)9798350354508

This study provides a review of the current state of research on TAM projects in the petrochemical industry, identifying key contributors, active publication sources, and challenges that need to be addressed for successful project execution. Utilizing R Studio software, bibliometric and content analysis were conducted on 63 research papers published between 2004 and 2024. The study identifies key challenges, including the need for improved risk management, enhanced collaboration among multidisciplinary teams, and the integration of advanced technologies. The results indicated the management of the shutdown process, risk management during the shutdown process and the resources intensive tasks as integral to TAM projects. This review highlights the need for ongoing research to address existing gaps and drive innovation in TAM practices, ultimately aiming to optimize maintenance strategies, improve operational safety, and ensure the long-term sustainability of the petrochemical industry. © 2024 IEEE.

关键词： Risk management

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Evaluation of the GEKO Turbulence Model for Whole Aircraft Drag Prediction

Evaluation of the GEKO Turbulence Model for Whole Aircraft D...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Kennedy, Alex Stuart, Charles Department of Mechanical Manufacturing and Biomedical Engineering Trinity College Dublin University of Dublin Ireland

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The aim of this study was to evaluate the Generalized k-ω (GEKO) turbulence model’s ability to be calibrated to improve the accuracy of the resolved drag polar for a whole aircraft geometry. The GEKO turbulence model provides a number of user configurable free parameters capable of being calibrated to better represent a given analytical setup. A global and local study was conducted on the DLR F6 geometry and validated using experimental results collected by ONERA during a wind tunnel test campaign. An ideal wind tunnel computational domain was constructed allowing for these studies to be conducted for several angle of attack design points. A calibration framework was constructed using a Box Behnken Design of Experiments (DoE) scheme to generate 21 parameter combinations, with a finetuning DoE scheme used to further study the influence of the parameters. A global analysis was carried out by simulating the geometry’s drag polar over seven angle of attack design points, allowing for the selection of the combination of parameters that returned the highest accuracy and solver stability from the analysis of the tuning results to be examined. The effects of the GEKO model’s parameters on the development of flow features and the modification of the predicted far field effects were also assessed. Further analysis was conducted using coefficient of pressure data derived from experimental results on the inboard and outboard sides of the pylon to assess the calibrated model’s ability to predict the local flow field. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Angle of attack

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