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A Study on Giant Magnetostrictive Actuator for Interior Sound Control System of the Ultra-Compact Mobility: Fundamental Consideration on Formation of the Giant Magnetostrictive Phases Depending on Heat Treatment Condition 27

A Study on Giant Magnetostrictive Actuator for Interior Soun...

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Kato, Taro Naganuma, Ryusei Bando, Koki Sawada, Kentaro Wenbao, Wu Kobayashi, Ikkei Kuroda, Jumpei Uchino, Daigo Ogawa, Kazuki Ikeda, Keigo Endo, Ayato Kato, Hideaki Narita, Takayoshi Furui, Mitusaki Tokyo University of Technology Department of Mechanical Engineering 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Sustainable Engineering Program Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Numazu College Department of Mechanical Engineering Ohoka 3600 Shizuoka Numazu-shi410-0022 Japan Aichi University of Technology Department of Electronic Robotics 50-2 Manori Nishisako-machi Aichi Gamagori-shi443-0047 Japan Hokkaido University of Science Department of Mechanical Engineering 7-Jo 15-4-1 Maeda Teine Hokkaido Sapporo006-8585 Japan Fukuoka Institute of Technology Department of Electrical Engineering Wajiro Higashi 3-30-1 Higashi-ku Fukuoka Fukuoka-shi811-0295 Japan Tokai University Department of Mechanical System Engineering Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan

ISBN: (纸本)9784886864406

An active noise control system using giant magnetostrictive actuator has been proposed as a countermeasure for interior noise of the ultra-compact mobilities, which is a new transportation tools. In this paper, as basic research toward the development of the proposed giant magnetostrictive actuator for active noise control, we conduct experiments on the material properties when terbium, dysprosium, and iron powder, which make up the giant magnetostrictive material, are mixed and the heat treatment conditions are changed. In this study, the heat treatment temperature was varied from 800°C to 1100°C in 100°C incrementsbased on the equilibrium state temperature of each material, and the heat treatment time was set in 30-minute increments from 1 hour to 3 hours. As a result, TbFe2 was confirmed after heat treatment at an electric furnace temperature of 1000°C for 3 hours, although its strength was insufficient. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Active noise control

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Layer-by-Layer Assembly of Chitosan and Quince Seed Gum Polyelectrolytes as a Ph-Responsive, On-Off Switchable Multilayer Film for Controlled Release of Ibuprofen

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SSRN 2024年

作者： Kaviani, Alireza Pircheraghi, Gholamreza Bagheri, Reza Azizi Saadatlou, Ghazaleh Demirel, A. Levent Department of Materials Science and Engineering Sharif University of Technology P.O. Box: 11365‐9466 Tehran Iran Materials Science & Engineering Graduate Program Koç University Sarıyer Istanbul34450 Turkey Chemistry Department Koç University Sarıyer Istanbul34450 Turkey

Polysaccharide-based multilayer films have shown substantial potential for drug delivery application. Herein, polyelectrolyte multilayers using Chitosan (CS) and Quince seed gum (QSG) are constructed and the effects of assembly pH, salt concentration, and post-assembly pH are systematically investigated. It was evident that both mass per unit area (10000 ng/cm2) and the wet thickness (107.8 nm) after the deposition of 5 bilayers were accurately estimated by viscoelastic model due to the highly swollen state of films. Atomic Force Microscopy (AFM) could feasibly demonstrate the development of globular structures during the layer-by-layer assembly. Ellipsometry analysis showed that the variation assembly pH resulted in conformational changes from extended to coiled. Consequently, different optical thicknesses as well as transitions from exponential to linear growth were observed. Moreover, extrinsic charge compensation was responsible for coiling or extensive counterion screening of polyelectrolyte chains depending on the NaCl concentration. CS/QSG films displayed pH-stimulus on–off switching behavior in pH 2 and 7.4 for 3 cycles. The constructed film could absorb 1200 ng/cm2 within 60 min at pH 7.4. The in vitro release kinetic from IBF-loaded samples showed pH dependency. The CS/QSG multilayer film can be considered as a smart and tunable pH stimuli system for drug loading/release applications. © 2024, The Authors. All rights reserved.

关键词： Chitosan

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Study on Microstructure and Properties of Aa7075 Coated by Micro Arc Oxidation

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SSRN 2023年

作者： Qi, Xing Jiang, Bo Jiang, Ziqiu Wang, Chao Song, Renguo School of Aeronautics and Mechanical Engineering Changzhou Institute of Technology Jiangsu Changzhou213032 China School of Materials Science and Engineering Changzhou University Jiangsu Changzhou213164 China

Effect of ageing temperature on the properties of 7075 aluminum alloy coated by micro arc oxidation (MAO) technology has been investigated. The precipitates formed during various ageing temperatures are observed by transmission electron microscope (TEM), which would significantly influence the properties of the MAO coating. Coherent distortion, size and volume fraction of precipitates are related to the changing of electrical conductivity during ageing treatment. Full coherent and dense GP zones formed at 90 ℃ can act as scattering centers to impede electron mobility, so decrease the electrical conductivity. η and η’ phases produced at 120 ℃ and 150 ℃ are semi-coherent and incoherent, respectively, meanwhile, the precipitate size increases and the volume fraction decreases with increasing the ageing temperature, therefore, the electrical conductivity increases. Higher electrical conductivity contributes to thicker coating with better surface morphology. Double cantilever beam (DCB) tests show that the thicker and less porous coatings prepared at 150 ℃ aged specimens own the best stress corrosion cracking (SCC) resistance. After pores are broke and coatings are ruptured, high Cu and low Mg segregation at the grain boundary of 150 ℃ aged specimens founded from high-angle annular dark field scanning transmission electron microscopy (HADDF-STEM) are beneficial to anodic dissolution and hydrogen assisted crack. © 2023, The Authors. All rights reserved.

关键词： Morphology

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Atomistic Simulations and Machine Learning of Solute Grain Boundary Segregation in Mg Alloys at Finite Temperatures

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SSRN 2023年

作者： Menon, Vaidehi Das, Sambit Gavini, Vikram Qi, Liang Department of Materials Science and Engineering University of Michigan Ann Arbor48109 United States Department of Mechanical Engineering University of Michigan Ann Arbor48109 United States

Understanding solute segregation thermodynamics is first step in investigating grain boundary (GB) properties, such as strong yttrium (Y) effects on grain growth and texture evolution in micro-scale polycrystalline magnesium (Mg) alloys. To estimate average GB segregation behavior of low-concentration Y solutes (e.g., 2 at.%), a state-of-the-art spectral approach is applied based on a per-site segregation energy spectrum for Y solutes at zero K obtained from molecular statistics (MS) simulations of ~104 GB sites in Mg symmetric tilt GBs (STGBs). Although selected MS simulation results are consistent with verifications by density functional theory (DFT) calculations, estimates of average segregation tendencies based on the zero-K energy spectrum deviate from experimental observations. To resolve this problem, thermodynamic integration (TI) methods based on molecular dynamics (MD) simulations are used to determine the per-site segregation free energies of Y at representative GB sites, which show contributions beyond harmonic approximations can be important for certain GB sites at high temperatures. A surrogate model of per-site segregation free energy is constructed from a small set of TI data points using stacking cross-validation regressors and physics-informed descriptors. This model is applied to predict the Y segregation free energy spectra for thousands of GB sites in Mg STGBs with uncertainty quantification. The average segregation tendency predicted by the spectral approach based on the free energy spectra agree well (within the uncertainty range) with experimental observations for micro-scale polycrystalline Mg alloys at typical thermomechanical processing temperatures (500~800K), where thermodynamic equilibrium states are likely to be achieved due to fast diffusion. © 2023, The Authors. All rights reserved.

关键词： Magnesium alloys

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Predicting Polymer Brush Behavior in Solvents using the Steepest-Entropy-Ascent Quantum Thermodynamic Framework

arXiv

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arXiv 2023年

作者： McDonald, Jared von Spakovsky, Michael R. Reynolds Jr, William T. Materials Science & Engineering Department Virginia Tech BlacksburgVA24061 United States Mechanical Engineering Department Virginia Tech BlacksburgVA24061 United States

The steepest-entropy-ascent quantum thermodynamic (SEAQT) framework is utilized to study the effects of temperature on polymer brushes. The brushes are represented by a discrete energy spectrum and energy degeneracies obtained through the Replica-Exchange Wang- Landau algorithm. The SEAQT equation of motion is applied to the density of states to establish a unique kinetic path from an initial thermodynamic state to a stable equilibrium state. The kinetic path describes the brush's evolution in state space as it interacts with a thermal reservoir. The predicted occupation probabilities along the kinetic path are used to determine expected thermodynamic and structural properties. The polymer density profile of a polystyrene brush in cyclohexane solvent is predicted using the equation of motion, and it agrees qualitatively with experimental density profiles. The Flory-Huggins parameter chosen to describe brush-solvent interactions affects the solvent distribution in the brush but has minimal impact on the polymer density profile. Three types of non-equilibrium kinetic paths with differing amounts of entropy production are considered: a heating path, a cooling path, and a heating-cooling path. Properties such as tortuosity, radius of gyration, brush density, solvent density, and brush chain conformations are calculated for each path. © 2023, CC BY-NC-ND.

关键词： Entropy

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Corner cutting connects chiral colorimetry to net electric flux in lossless all-dielectric metasurfaces

arXiv

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arXiv 2024年

作者： Haddadin, Zaid Nguyen, Anna M.Y. Poulikakos, Lisa V. Department of Electrical & Computer Engineering UC San Diego La Jolla CA92093-0021 United States Department of Mechanical & Aerospace Engineering UC San Diego La Jolla CA92093-0021 United States Program of Materials Science & Engineering UC San Diego La Jolla CA92093-0021 United States

All-dielectric metasurfaces can produce structural colors, but the most advantageous design criteria are still being investigated. This work numerically studies how the two-dimensional shape of nanoparticles affects the colorimetric response under circularly polarized light (CPL) to develop a sensor distinguishing CPL orientations. Using lossless dielectric materials (silicon nitride on silicon dioxide), we achieve far-field dichroism by modifying oblong nanoparticles into L-shaped structures through corner cuts. This design suppresses one electric dipole under CPL illumination, leading to differential colorimetric responses. We link these responses to a decoupling effect in the near-field net electric flux. Our findings provide design guidelines for all-dielectric, lossless colorimetric sensors of chiral light. Copyright © 2024, The Authors. All rights reserved.

关键词： Silicon nitride

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Exploring the Effects of Temperature, Transverse Pressure, and Strain Rate on Axial Tensile Behavior of Pristine Polyethylene Crystals Using Molecular Dynamics

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SSRN 2024年

作者： Dewapriya, M.A. Nuwan Deitzel, Joseph M. Gillespie, John W. Center for Composite Materials University of Delaware NewarkDE United States Department of Materials Science and Engineering University of Delaware NewarkDE United States Department of Mechanical Engineering University of Delaware NewarkDE United States Department of Civil and Environmental Engineering University of Delaware NewarkDE United States

We investigated the influence of temperature, transverse pressure, and strain rate on the axial tensile behavior of pristine polyethylene (PE) crystals using molecular dynamics simulations, considering the combined effects of these parameters. Our findings indicate that elevated temperatures reduce modulus and strength due to thermal vibrations disturbing the crystal structure and increasing kinetic energy. Conversely, transverse pressure enhances properties by improving interchain interactions. As the strain rate increases, modulus and strength increase, reaching a plateau when the loading velocity exceeds the maximum sliding velocity of the broken chains, which occurs around a strain rate of 1012 s-1. These insights into the mechanical response of pristine PE crystals enhance our understanding of ultra-high-molecular-weight polyethylene fiber behavior under realistic service temperatures and impact conditions, with significant implications for designing protective structures such as body armor. © 2024, The Authors. All rights reserved.

关键词： Strain rate

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Validation of PV numerical simulation model with an experimental setup

Validation of PV numerical simulation model with an experime...

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International Conference on Modern Power Systems (MPS)

作者： Ştefan Ardeleanu Rafaela Agathokleous Soteris Kalogirou Marius Purcar Dan Penciu Electrotechnics and Measurements Department Technical University of Cluj-Napoca Cluj-Napoca Romania Department of Mechanical Engineering and Materials Science and Engineering Cyprus University of Technology Limassol Cyprus

The renewable energy industry has experienced continuous growth, as humanity looks for more sustainable ways to produce electrical energy. Today, photovoltaics represents the biggest share of the renewable energy industry The study begins with a presentation of the working principles of a photovoltaic panel. Then a numerical model of a photovoltaic panel is developed, based on actual characteristics from a commercial panel. The main goal is to produce a model capable of analyzing the different operating conditions of solar panels and predict their behavior by employing the appropriate parameters. The model is built in Matlab/ SIMULINK, based on the equivalent circuit of PV cells. The results are validated with experimental test data obtained by operating the PV panel both with an indoor solar simulator and the real sun. In both cases the modelled and experimental results are very close.

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Features of the Liquid Film in Downward Vertical Air-Water Annular Flow: Downstream Flow Evolution and Disturbance Wave Parameters

SSRN

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SSRN 2023年

作者： Morales, Rigoberto E.M. Santana, Ana L.B. da Silva, Marco J. dos Santos, Eduardo N. Marcelino Neto, Moisés A. Multiphase Flow Research Center NUEM Graduate Program in Mechanical and Materials Engineering – PPGEM Federal University of Technology of Parana PR Curitiba Brazil

Experiments in downward vertical air-water annular flow in a 26-mm ID, 14-m length pipe were conducted to analyze and improve the understanding of the main characteristics of the liquid film. The downstream evolution of the flow was analyzed at two test sections placed at 90D and 335D from the flow inlet. A non-intrusive conductance sensor and a high-speed camera were deploy*d to measure the characteristics of the liquid film in the test sections. Thirty-five combinations of superficial air and water velocities were investigated, ranging from 0 m/s to 20 m/s and 0.05 m/s to 0.25 m/s, respectively. The analysis of the liquid film time-series provided quantitative features such as the average film thickness, roughness of the liquid film, velocity, frequency, amplitude, length and the appearance of the disturbance waves. Individual identification of the disturbance waves was performed so as to investigate the velocity and frequency concerning the distribution of the waves and their interaction. Moreover, variations for all annular flow characteristics were observed in the flow direction and new correlations to predict the main parameters of the unit wave in Downward Vertical Annular Flows (DVAF) are proposed. © 2023, The Authors. All rights reserved.

关键词： Liquid films

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Stannic Oxide Quantum Dots Constructed Evenly Alloyable Layer Stabilizing Lithium Metal Batteries

SSRN

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SSRN 2023年

作者： Chen, Yuanzhen Huang, Changyong Zhang, Zhanling Liu, Yong Zhou, Yazhou Wen, Sifan Wang, Fei School of Materials Science and Engineering Henan University of Science and Technology Luoyang471000 China Henan Key Laboratory of Nonferrous Materials Science & Processing Technology Collaborative Innovation Center of Nonferrous Metal Luoyang471000 China The State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Xi’an710049 China

Dendrite growth is still a problem that high energy density lithium metal batteries must face to commercialize. At present, the introduction of lithophilic materials on the current collector has proved to be an effective strategy. However, most of the work is not conducive to the practical application of lithium metal battery due to the neglect of the preparation cost and the excessive and uncontrollable modifier. Herein, stannic oxide (SnO2) quantum dots (QDs) were prepared by a simple dehydration reaction to construct a lithophilic modification layer on the surface of copper foil. In addition, SnO2 quantum dots could induce uniform nucleation and growth of lithium ions at quantum scale. More importantly, when the copper collector was modified by SnO2 QDs, the symmetric cell could cycle stably for 3200 h at a current density of 1 mA cm-2, which is better than other reports. LiFePO4 was employed as cathodic materials to fabricate a full battery, which delivered a capacity of 130.4 mAh g-1 with a capacity retention rate of 87.75% at 0.5C for 200 cycles. Therefore, this work can be extended to practical applications, and help lithium metal batteries to be industrialized. © 2023, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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