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113th Annual ASEE Conference and Exposition, 2006

作者： Hinds, Timothy Somerton, Craig Chalou, Robert Radcliffe, Clark Griffore, Gaile Michigan State University United States Michigan State University Department of Mechanical Engineering United States Undergraduate Program Department of Mechanical Engineering Michigan State University United States Graduate Program Department of Mechanical Engineering Michigan State University United States American Society of Mechanical Engineers United States Department of Mechanical Engineering 2439 Engineering Building United States Department of Mechanical Engineering 2560 Engineering Building United States

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Establishing a B.S. degree program in mechanical engineering in partnership with industry: A case study

Establishing a B.S. degree program in mechanical engineering...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Wojciechowski, Paul H. York College of Pennsylvania Mechanical Engineering Program York College of Pennsylvania

The creation of a new baccalaureate degree program in mechanical engineering at York College of Pennsylvania took place with the guidance and input provided by an industrial partnership of over 20 local and regional industrial organizations. Initial start-up contributions amounting to $400,000, along with approximately $45,000 provided annually by industry, has resulted in the establishment of state-of-the-art laboratory facilities as well as partial scholarship support for students in the program. The program had its first class of students enter in fall 1995 and currently consists of approximately 100 students majoring in mechanical engineering. The ABET evaluation visit under EC2000 occurred in September 1999 and resulted in accreditation of the program. Designing a new engineering curriculum - in concert with industrial partners - within the broad context of a private, moderately sized, comprehensive college posed many challenges. This presentation will review these challenges, the process used for establishing a new program in mechanical engineering, and the role industry has played in developing and supporting the program.

关键词： engineering education

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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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A possible solution for noise attenuation material for urban buses: The downtown São Paulo case study

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Noise and Vibration Worldwide 2025年第3期56卷 137-147页

作者： Monteiro, Elvis C Avila, Antonio F Division Stellantis Betim Brazil Mechanical Engineering Graduate Studies Program Universidade Federal de Minas Gerais Belo Horizonte Brazil Department of Mechanical Engineering and Mechanical Engineering Graduate Studies Program Universidade Federal de Minas Gerais Belo Horizonte Brazil

Urban buses, particularly in large cities, are exposed to significant noise pollution. This paper presents a new family of materials at the micro/nano level designed for urban noise attenuation, specifically for application in urban buses. Melamine foam is combined in series with nanomembranes, creating a composite material that functions as a Helmholtz resonator. As sound waves pass over the nanomembranes, they are disturbed, and the sound resonates within the melamine foam. This interaction reduces the energy of the sound waves and enhances the noise absorption coefficient. In ten cases studied, the average sound absorption coefficient was approximately 89%, with peak frequencies ranging from 2400 Hz to 4300 Hz. The average thickness of the nanomembranes was around 5.0 µm, while the melamine foam had a thickness of 13 mm. The mean noise reduction achieved was about 11 dB, which depends on factors such as the morphology, thickness, and pore size of the nanomembranes. A case study conducted in downtown São Paulo demonstrated that applying these materials to urban buses can significantly reduce interior noise levels. Finally, the proposed system is fully scalable and adaptable for various applications where acoustic insulation is required. © The Author(s) 2025.

关键词： Noise pollution

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Impact of different descriptions for diffusion, heat transfer, and capillary pressure on a physics-based proton-exchange membrane fuel cell model

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International Journal of Hydrogen Energy 2025年 133卷 386-401页

作者： Carneiro, Leonardo F. Costa Junior, Esly F. de P. Andrade, Samuel T. Matencio, Tulio Postgraduate Program in Chemical Engineering PPGEQ-UFMG Brazil Postgraduate Program in Mechanical Engineering PPGMEC-UFMG Brazil Department of Chemistry DEQ/ICEX-UFMG UFMG Brazil

A physics-based, two-phase, and non-isothermal proton-exchange membrane fuel cell model is developed and used to evaluate the impact of three common modeling assumptions concerning mass and heat transport in a single-cell system. Firstly, using Fick's law to describe the diffusive transport caused significant differences in the concentration profiles when compared to the Stefan-Maxwell equation, resulting in considerable deviations in the polarization curve. Moreover, the description of thermal effects is found to be crucial to obtaining accurate water molar fraction profiles for the cathode, even when heat removal is effective. Finally, while the impact related to the capillary pressure description in the polarization curve is insignificant when ohmic losses dominate, as they considerably affect the liquid water and oxygen profiles, they may be crucial to obtain precise values at high current densities when water removal is less efficient. These results should provide valuable insights for the development of better models. © 2025 Hydrogen Energy Publications LLC

关键词： Maxwell equations

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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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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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Throughput and Quality Optimized Down-Selection of Overlay Measurement Markers for Robust Control of the Maximum Overlay Error in a Pattern Layer in Photolithography Processes

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IEEE Transactions on Semiconductor Manufacturing 2025年第2期38卷 251-262页

作者： Graff, Noah Djurdjanovic, Dragan The University of Texas at Austin Graduate Program in Dynamic Systems & Controls Walker Department of Mechanical Engineering AustinTX78712 United States The University of Texas at Austin Walker Department of Mechanical Engineering AustinTX78712 United States

This paper presents a metaheuristic optimization-based approach for selecting a pre-determined number of measurement markers from the set of available markers that optimizes the performance of the recently introduced robust L∞ norm overlay control algorithm, which robustly minimizes the worst overlay error across a given pattern layer. This optimization is then used in a Design of Experiments (DOE) setting to build a tractable regression model of a customizable objective function encompassing cost effects of quality losses and throughput benefits resulting from the down-selection of markers selected for robust overlay control. Using this model, one can rapidly determine the optimal proportion of markers for any set of cost parameters, and the optimal subset forming this proportion of available markers can be down-selected to maximize performance of the resulting robust overlay controller. Overlay data and models from a semiconductor manufacturing fab were used to evaluate the newly proposed inspection and control strategy. Results clearly indicate that the novel strategic down-selection of measurement markers coupled with robust overlay control could lead to vastly improved throughputs without decreasing quality relative to what can be achieved using traditional Run-to-Run (R2R) control. Feasibility of the novel DOE-based optimization was demonstrated for two scenarios of cost-effect parameters. © 1988-2012 IEEE.

关键词： Throughput

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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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L-Heat Pipe Simulation for Lithium-Ion Electric Vehicle Battery Cooling Systems 4

L-Heat Pipe Simulation for Lithium-Ion Electric Vehicle Batt...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Septiadi, Wayan Nata Astawa, Ketut Eleazar, Rolland Pierce Ramadhani, Dandi Bhaswara, Nabiel Rafa Angel Jayendra, Kadek Dananta Study Program of Mechanical Engineering Faculty of Engineering Universitas Udayana Bali Bukit Jimbaran80361 Indonesia

The Li-ion battery is electrical storage in the form of chemical energy and is considered the strongest candidate for electrical-based automotive applications. The performance of the battery greatly affects the performance of electric vehicles. There is a need for effective thermal management to control battery temperature below a defined temperature such as 50°C. The thermal management system in the battery can be done by passively cooling it using heat pipes and heat sinks. This research was conducted by simulating the Makara Electric Vehicle's electric scooter battery module which was applied with a heat pipe-based cooling system. The simulated module focuses on heat pipes and 18650 lithium-ion batteries with discharge rate variations of 1C, 2C., and 3C. The method used is literature study and CFD simulation. The results show that the heat pipe cooling system can reduce battery temperature at each discharge rate variation of 12,85%, 16,23%, and 23,74%. Heat Pipe can absorb the highest heat of 68,1178 kW when the module uses a 3C battery. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Cooling systems

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