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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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Sedimentation-driven one-step fabrication of bifunctional single-layered triboelectric nanogenerator from sol-state composite precursor

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Friction 2025年第2期13卷 49-56页

作者： Yoonsang Ra Dongik Kam Sunmin Jang Sumin Cho Donghan Lee Dongwhi Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityGyeonggi 17104Republic of Korea

Although the triboelectric nanogenerator(TENG)has been highlighted as a promising mechanical energy harvester,the requirement of stacking the two individual layers,contact and conductive layers,has been ball and chain around the ankle of unleashing potential and an advantage of TENGs in their application expansion and ***,one-step fabrication of a single-layered bifunctional composite film-based TENG(BFTENG)driven by the sedimentation of a sol-state precursor is proposed for the extremely facile conversion of various ordinary items into energy *** BF-TENG consists of the polydimethylsiloxane(PDMS)matrix and a carbon nanopowder filler,and it includes both the dielectric part(DP)and conductive part(CP)in one single *** electrical percolation threshold of the incorporated concentration of carbon,ICC,for CP to act as a passage through which induced charges move in BF-TENGs is determined to be 1.0 wt%.The degree of carbon sedimentation in developing the proposed composite can be controlled by the curing speed and the probability of a crosslinking *** maximum peak power is approximately 0.093μW when the contact surface area is 78.5 mm2;the contact frequency is 8 Hz,and the connected load resistance is 9 MΩ.Based on these results,the electrical performance of BF-TENGs in response to various physical stimuli is characterized considering the mechanical energy sources available in daily ***,converting ordinary surfaces such as desks and human skin into BF-TENGs through a single coating procedure and harvesting energy to power an electric device are demonstrated as a proof-of-concept.

关键词： triboelectric nanogenerator one-step fabrication sedimentation bifunctional composite film

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Mathematical modeling and simulations of stress mitigation by coating polycrystalline particles in lithium-ion batteries

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL J.CHOI S.F.SHAH C.LEE S.LEE Department of Mechanical Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A chemo-mechanical model is developed to investigate the effects on the stress development of the coating of polycrystalline Ni-rich LiNixMnyCo_(z)O_(2)(x≥0.8)(NMC)particles with poly(3,4-ethylenedioxythiophene)(PEDOT).The simulation results show that the coating of primary NMC particles significantly reduces the stress generation by efficiently accommodating the volume change associated with the lithium diffusion,and the coating layer plays roles both as a cushion against the volume change and a channel for the lithium transport,promoting the lithium distribution across the secondary particles more ***,the lower stiffness,higher ionic conductivity,and larger thickness of the coating layer improve the stress *** paper provides a mathematical framework for calculating the chemo-mechanical responses of anisotropic electrode materials and fundamental insights into how the coating of NMC active particles mitigates stress levels.

关键词： lithium-ion battery(LIB) polycrystalline particle coating finite element simulation Ni-rich LiNixMnyCo_(z)O_(2)(x>0.8)(NMC)

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Adaptive Discrete-Time Sliding Mode Control Applied to the Pitch Motion of a Micro Air Vehicle with Flapping Wings

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Journal of Bionic engineering 2025年第2期22卷 585-595页

作者： Joshua Hill Farbod Fahimi Chang-kwon Kang Hikaru Aono Department of Mechanical&Aerospace Engineering University of Alabama in HuntsvilleHuntsvilleAL35899USA Department of Mechanical Engineering and Robotics Shinshu University3-15-1 Tokida3868567UedaNaganoJapan

A robust Adaptive Discrete-time Sliding Mode Controller (ADSMC) is formulated, and is applied to control the pitch motion of a simulated Flapping-Wing Micro Air Vehicle (FWMAV). There is great potential for FWMAVs to be used as aerial tools to assist with gathering data and surveying environments. Thanks to modern manufacturing and technology, along with an increased comprehension behind the aerodynamics of wing flaps, these vehicles are now a reality, though not without limitations. Given their diminutive size, FWMAVs are susceptible to real-world disturbances, such as wind gusts, and are sensitive to particular variations in their build quality. While external forces such as wind gusts can be reasonably bounded, the unknown variations in the state may be difficult to characterize or bound without affecting performance. To address these problems, an ADSMC is developed. First, the FWMAV model is converted from continuous-time to discrete-time. Second, an ADSMC for the newly discretized FWMAV model is developed. Using this controller, the trajectory tracking performance of the FWMAV is assessed against a traditional discrete sliding mode controller, and is found to have a decreased chattering frequency and decreased control effort for the same task. Therefore, the ADSMC is assessed as the superior controller, despite being completely unaware of the model parameters or wind gust.

关键词： Discrete-time sliding-mode control Adaptive sliding-mode control Flapping-wing micro air vehicles Wind gust

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Concurrent generation and amplification of longitudinal and bending waves using defective phononic crystals

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Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 269-288页

作者： S.H.JO Department of Mechanical Roboticsand Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave *** previous research has focused on applications such as narrow-bandpass filters,ultrasonic sensors,and piezoelectric energy harvesters,typically operating under the assumption of an external elastic wave ***,a novel approach that uses defective PnCs as ultrasonic actuators to generate amplified waves has ***,the existing studies are limited to the generation of either longitudinal or bending waves,with no research addressing the concurrent generation of ***,this paper proposes a straightforward methodology for the concurrent generation and amplification of both wave types utilizing defect modes at independent defect-band *** piezoelectric elements are attached to the defect,with each element connected to independent external voltage *** precisely adjusting the magnitude and temporal phase differences between the voltage sources,concurrently amplified wave generation is *** paper highlights the advantages of the proposed analytical *** model is both computationally time-efficient and accurate,in comparison with the COMSOL simulation *** instance,in case studies,the analytical model reduces the computational time from one hour to mere seconds,while maintaining acceptable error rates of 1%in peak *** concurrent wave-generation methodology opens new avenues for applications in rotating machinery fault diagnosis,structural health monitoring,and medical imaging.

关键词： phononic crystal(PnC) defect concurrent generation piezoelectric ultrasonic actuator

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Generalized polynomial chaos expansion by reanalysis using static condensation based on substructuring

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 819-836页

作者： D.LEE S.CHANG J.LEE Department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea School of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This paper presents a new computational method for forward uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and dependent random *** method consists of a generalized polynomial chaos expansion(GPCE)for statistical moment and reliability analyses associated with the stochastic output and a static reanalysis method to generate the input-output data *** the reanalysis,we employ substructuring for a structure to isolate its local regions that vary due to random *** allows for avoiding repeated computations of invariant substructures while generating the input-output data *** substructuring with static condensation further improves the computational efficiency of the reanalysis without losing ***,the GPCE with the static reanalysis method can achieve significant computational saving,thus mitigating the curse of dimensionality to some degree for UQ under high-dimensional *** numerical results obtained from a simple structure indicate that the proposed method for UQ produces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).We also demonstrate the efficiency and scalability of the proposed method by executing UQ for a large-scale wing-box structure under ten-dimensional(all-dependent)random inputs.

关键词： forward uncertainty quantification(UQ) generalized polynomial chaos expansion(GPCE) static reanalysis method static condensation substructuring

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Flexural-wave-generation using a phononic crystal with a piezoelectric defect

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Applied Mathematics and Mechanics(English Edition) 2023年第8期44卷 1241-1262页

作者： S.H.JO D.LEE Department of Mechanical Roboticsand Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea Department of Mechanical Engineering Seoul National UniversitySeoul 08826Republic of Korea

This paper proposes a method to amplify the performance of a flexural-wave-generation system by utilizing the energy-localization characteristics of a phononic crystal(PnC)with a piezoelectric defect and an analytical approach that accelerates the predictions of such wave-generation *** proposed analytical model is based on the Euler-Bernoulli beam *** proposed analytical approach,inspired by the transfer matrix and S-parameter methods,is used to perform band-structure and time-harmonic analyses.A comparison of the results of the proposed approach with those of the finite element method validates the high predictive capability and time efficiency of the proposed model.A case study is explored;the results demonstrate an almost ten-fold amplification of the velocity amplitudes of flexural waves leaving at a defect-band frequency,compared with a system without the ***,design guidelines for piezoelectric-defect-introduced PnCs are provided by analyzing the changes in wave-generation performance that arise depending on the defect location.

关键词： phononic crystal(PnC) defect wave-generation fexural wave analytical model

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Evaluation of Windshield Impact on Embedded LiDAR Systems in Autonomous Vehicles

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Transactions of the Korean Society of mechanical Engineers, A 2025年第5期49卷 371-381页

作者： Park, Kyutae Ki, Daeyeon Choi, Haram Song, Jinwoo Kim, Heung Soo Department of Mechanical Robotics and Energy Engineering Dongguk Univ. Korea Republic of

In this study, the effect of the vehicle windshield on the light detection and ranging (LiDAR) sensor signal was analyzed in constructing an embedded LiDAR system for an autonomous vehicle. Ten different types of tinted films were attached to the windshield to simulate the vehicle environment, and changes in the LiDAR signal transmission were observed. One-dimensional (1D) LiDAR sensors and Lambertian targets were used to derive data that passed through the windshield and reflected from the target. The changes in signal strength and distance measurements of the LiDAR sensor were quantitatively evaluated and analyzed. In experiments, the signal strength of the LiDAR sensor decreased and was scattered when transmitted through the windshield and some tinting films, leading to an increase in the uncertainty of the distance measurement accuracy. The experimental model proposed in this paper is expected to provide a basis for evaluating the effects of windshields and tinting films on LiDAR sensor signals in advance when designing an embedded LiDAR system for autonomous vehicles. © 2025 The Korean Society of mechanical Engineers.

关键词： Distance measurement

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Studying the Impact of T4 and T6 Heat Treatments on Corrosion and mechanical Properties of 6082-Al Alloy Treated with Al-5Ti-1B Grain Refiner

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Journal of Bio- and Tribo-Corrosion 2025年第1期11卷 1-13页

作者： Abd El-Aziz, Kh. Saber, D. Materials Engineering Department Faculty of Engineering Zagazig University Zagazig44519 Egypt Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia Industrial Engineering Program Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia

The mechanical and corrosion characteristics of aluminum alloys can be influenced not only by the addition of grain refiners but also by heat treatment that modifies the microstructure and introduces variations in these characteristics. The purpose of this work was to examine how the mechanical properties and corrosion resistance of 6082-Al alloy with Al-5Ti-1B grain refiner are affected by both artificial and natural aging heat treatments. By using the permanent mold casting process, the required specimens of the investigated alloys were produced. A VHS-1000 microhardness testing apparatus is used to measure microhardness at a 100 g load. A sliding wear test is carried out using a pin-on-disk apparatus. Potentiodynamic polarization curves in a 3.5 weight percent NaCl solution are used to assess the corrosion behavior of every specimen. The current results revealed that the mechanical properties improved markedly with the additions of Al–5Ti-1B grain refiner to the investigated alloy, this is maybe due to the microstructure changes as a result of grain refiner additions. Although the addition of Al-5Ti-1B grain refiner to 6082-Al alloy improved the hardness and wear resistance, it showed a negative influence on the corrosion resistance of these alloys. The results also demonstrated that, when compared to as-cast condition, artificial heat treatment of 6082-Al alloy inoculated by Al-5Ti-1B grain refiner improved their hardness, wear resistance, and corrosion properties significantly. Furthermore, compared to natural aging heat treatment, artificial aging heat treatment demonstrated a noticeably improved level of hardness, wear, and corrosion behavior. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Aluminum corrosion

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Quenched PVDF/PMMA Porous Matrix for Triboelectric Energy Harvesting and Sensing

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Energy & Environmental Materials 2025年第1期8卷 229-238页

作者： Assem Mubarak Bayandy Sarsembayev Yerzhigit Serik Abdirakhman Onabek Zhanat Kappassov Zhumabay Bakenov Kazuyoshi Tsuchiya Gulnur Kalimuldina Department of Mechanical and Aerospace Engineering School of Engineering and Digital Sciences Nazarbayev University Institute of Smart Systems and Artificial Intelligence Nazarbayev University Department of Robotics Engineering School of Engineering and Digital Sciences Nazarbayev University Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Micro/Nano Technology Center Tokai University

The rapid development of nanotechnology has significantly revolutionized wearable electronics and expanded their *** introducing innovative solutions for energy harvesting and autonomous sensing,this research presents a cost-effective strategy to enhance the performance of triboelectric nanogenerators(TENGs).The TENG was fabricated from polyvinylidene fluoride(PVDF) and N,N'-poly(methyl methacrylate)(PMMA) blend with a porous structure via a novel optimized quenching method.

关键词： N,N′-poly(methyl methacrylate) (PMMA) robotic tactile sensors polyvinylidene fluoride (PVDF) quenching triboelectric nanogenerators (TENGs)

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