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Predicting ultimate tensile strength of SiC/SiC mini-composites via machine learning

Ceramics International 2025年

作者： Bezik, Cody T. Akram, Mohammad Basit Bowser, Blake Detwiler, Kaitlin N. Hilmas, Ashley M. Balasubramanian, Ganesh Varshney, Vikas National Research Council Research Associate Program Fellow United States Materials and Manufacturing Directorate Air Force Research Laboratory Wright-Patterson Air Force Base Dayton 45433 OH United States Department of Mechanical and Industrial Engineering University of New Haven West Haven 06516 CT United States Mechanical Engineering Department The University of Akron Akron 44325 OH United States

Silicon carbide fiber-reinforced SiC matrix (SiC/SiC) ceramic matrix composites are promising structural materials for aerospace and nuclear applications. Designing such materials requires understanding the relationships between composition, processing, and mechanical performance. This work presents a data-driven approach using machine learning to predict the ultimate tensile strength (UTS) of SiC/SiC mini-composites. A curated dataset of 131 mini-composites, extracted from the literature, encompassing compositional information, processing parameters, and mechanical properties, was assembled and used to train and test machine learning models. Missing data, arising from inconsistencies among the sources, were addressed using k-nearest neighbors imputation. The impact of different data sampling strategies — using all data, selectively undersampling to remove a sparse, high-strength region, and balancing via SMOGN oversampling — was evaluated. Three decision tree ensemble models (Random Forest, XGBoost, and LightGBM) were trained and evaluated. The results demonstrate the utility of machine learning for predicting UTS. The XGBoost model, trained on oversampled data, exhibited the best performance, with a mean absolute error of 60.1 MPa and a mean absolute percentage error of 8.8%. Feature importance analysis identified key determinants of UTS, including other tensile properties, fiber properties, interfacial properties, and the coefficients of thermal expansion of the materials. The trained model could be integrated into iterative inverse design frameworks for the rapid optimization and discovery of high-performance SiC/SiC mini-composites, reducing the experimental burden in future materials design. © 2025

关键词： Composites mechanical properties Nanocomposites SiC Strength

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Creep trajectory transition of a nonstationary viscoelastic model onto a single rate parameter

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Physical Review E 2021年第4期104卷 045001-045001页

作者： H. Tanaka G. Yamanokuchi Y. Shibutani Department of Mechanical Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan Nanotechnology Program VNU Vietnam Japan University Luu Huu Phuoc Street My Dinh 1 Ward Nam Tu Liem District Ha Noi Viet Nam

A system of three-variable differential equations, which has a nonstationary trajectory transition through the control of a single rate parameter, is formulated. For the nondimensional system, the critical trajectory creeps before a transition in a long-lasting plateau region in which the velocity vector of the system hardly changes and then diverges positively or negatively in finite time. The mathematical model well represents the compressive viscoelasticity of a spring-damper structure simulated by the multibody dynamics analysis. In the simulation, the post-transition behaviors realize a tangent stiffness of the self-contacted structure that is polarized after transition. The mathematical model is reduced not only to concisely express the abnormal compression problem, but also to elucidate the intrinsic mechanism of creep-to-transition trajectories in a general system.

关键词： Critical phenomena Elasticity mechanical deformation

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Corrigendum to “AI-driven adaptive grasping and precise detaching robot for efficient citrus harvesting” [Comput. Electron. Agricult. 232 (2025) 110131]

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Computers and Electronics in Agriculture 2025年 234卷

作者： Dong Woon Choi Jong Hyeon Park Ji-Hyeon Yoo KwangEun Ko School of Mechanical Engineering Hanyang University Seoul 04763 South Korea Human-Centric Robotics R&D Department Korea Institute of Industrial Technology 143 Hanggaul-ro Sangnok-gu Ansan-si Gyeonggi-do 15588 South Korea

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State Observation of Affine-in-the-States Systems with Unknown Time-Varying Parameters and Output Delay

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IFAC-PapersOnLine 2022年第12期55卷 341-346页

作者： Alexey Bobtsov Nikolay Nikolaev Romeo Ortega Denis Efimov Olga Kozachek Department of Control Systems and Robotics ITMO University Kronverkskiy av. 49 Saint-Petersburg 197101 Russia Departamento Académico de Sistemas Digitales ITAM Ciudad de México México INRIA Univ. Lille CNRS UMR 9189 - CRIStAL F-59000 Lille France Laboratory “Control of Complex Systems” Institute of Problems of Mechanical Engineering V.O. Bolshoj pr. 61 St. Petersburg 199178 Russia

In this paper we address the problem of adaptive state observation of affine-in-the-states time-varying systems with delayed measurements and unknown parameters. The development of the results proposed in the [Bobtsov et al. 2021a] and in the [Bobtsov et al. 2021c] is considered. The case with known parameters has been studied by many researchers—see [Sanz et al. 2019, Bobtsov et al. 2021b] and references therein—where, similarly to the approach adopted here, the system is treated as a linear time-varying system. We show that the parameter estimation-based observer (PEBO) design proposed in [Ortega et al. 2015, 2021] provides a very simple solution for the unknown parameter case. Moreover, when PEBO is combined with the dynamic regressor extension and mixing (DREM) estimation technique [Aranovskiy et al. 2016, Ortega et al. 2019], the estimated state converges in fixed-time with extremely weak excitation assumptions.

关键词： Nonlinear time-varying systems state observer delay systems parameter estimation

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Development of Active CO2 Emission Control for Diesel Engine Exhaust Using Amine-Based Adsorption and Absorption Technique

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Adsorption Science & Technology 2022年 2022卷

作者： Solomon Jenoris Muthiya L. Natrayan L. Yuvaraj Mohankumar Subramaniam Joshuva Arockia Dhanraj Wubishet Degife Mammo Department of Automobile Engineering Dayananda Sagar College of Engineering Bengaluru 560078 India Department of Mechanical Engineering Saveetha School of Engineering SIMATS Chennai 602105 Tamil Nadu India Department of Automobile Engineering Acharya Institute of Technology Bangalore 560107 Karnataka India Department of Automobile Engineering Kumaraguru College of Technology Coimbatore 641006 India Center for Automation and Robotics (ANRO) Department of Mechanical Engineering Hindustan Institute of Technology and Science Padur Chennai 603103 India Mechanical Engineering Department Wollo University Kombolcha Institute of Technology South Wollo Kombolcha 208 Amhara Ethiopia

Diesel-powered transportation is considered an efficient method of transportation; this sees the increase in the demand for the diesel engine. But diesel engines are considered to be one of the largest contributors to environmental pollution. The automobile sector accounts for the second-largest source for increasing CO2 emission globally. In this experiment, a suitable postcombustion treatment to control CO2 emission from IC engine exhaust is developed and tested. This work focuses to control CO2 emission by using the chemical adsorbent technique in diesel engine exhaust. An amine-based liquid is used to adsorb the CO2 molecules first and absorb over the amines from the diesel engine exhaust. Three types of amino solutions (L-alanine, L-aspartic acid, and L-arginine) were prepared for 0.3 mole concentrations, and the CO2 absorption investigation is performed in each solution by passing the diesel exhaust. A suitable CO2 adsorption trap is developed and tested for CO2 absorption. The experiments were performed in a single-cylinder diesel engine under variable load conditions. The eddy current dynamometer is used to apply appropriate loads on the engine based on the settings. The AVL DIGAS analyzer was used to measure the CO2, HC, and CO emissions. An uncertainty analysis is carried out on the experimental results to minimize the errors in the results. The effective CO2 reduction was achieved up to 85%, and simultaneous reduction of HC and CO was also observed.

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Haptic display for virtual reality: progress and challenges

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Virtual Reality & Intelligent Hardware 2019年第2期1卷 136-162页

作者： Dangxiao WANG Yuan GUO Shiyi LIU Yuru ZHANG Weiliang XU Jing XIAO State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100083China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100083China Peng Cheng Laboratory Shenzhen 518055China Department of Mechanical Engineering University of AucklandAuckland 1142New Zealand School of Computer Science and the Robotics Engineering Program Worcester Polytechnic InstituteWorcesterMA 01609-2280USA

Immersion, interaction, and imagination are three features of virtual reality (VR). Existing VR systems possess fairly realistic visual and auditory feedbacks, and however, are poor with haptic feedback, by means of which human can perceive the physical world via abundant haptic properties. Haptic display is an interface aiming to enable bilateral signal communications between human and computer, and thus to greatly enhance the immersion and interaction of VR systems. This paper surveys the paradigm shift of haptic display occurred in the past 30 years, which is classified into three stages, including desktop haptics, surface haptics, and wearable haptics. The driving forces, key technologies and typical applications in each stage are critically reviewed. Toward the future high-fidelity VR interaction, research challenges are highlighted concerning handheld haptic device, multimodal haptic device, and high fidelity haptic rendering. In the end, the importance of understanding human haptic perception for designing effective haptic devices is addressed.

关键词： Haptic display Virtual reality Desktop haptics Surface haptics Wearable haptics Multimodal haptics

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A Parametric of Basin Geometry of Gravitational Water Vortex Power Plant

A Parametric of Basin Geometry of Gravitational Water Vortex...

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2020 International Conference on Sustainable Energy engineering and Application, ICSEEA 2020

作者： Huwae, Reza Susatyo, Anjar Subekti, Ridwan Arief Sudibyo, Henny Khaerudini, Deni Shidqi Mercu Buana University Program of Study Nagister in Mechanical Engineering Jakarta Indonesia Research Centre for Electrical Power and Mechatronics Bandung Indonesia Research Center for Physics Serpong Indonesia Department of Physics FMIPA Universitas Indonesia Depok Indonesia

ISBN: (纸本)9781728188492

Energy demand is increasing and it raise a climate change issue. Greenhouse emissions, depleted fossil energy resources, increasing fossil energy cost are reasons to maximize the utilization of renewable energy source. Hydropower extend an alternative energy source to cover the growing energy demand and release no emission at the same time for maintaining the climate change. In recent years, major focus of hydropower research is moving to small hydropower, as large hydropower opportunities are exploited and have high capital expenditure to build. A water vortex stream is a common phenomenon that we can see everyday life. Water flow out from the bathtub through outlet or water flow down in the sink after we finish washing the dishes, that is what we call vortex flow. and is a free-surface flow, homogenous fluid that contained water and air. This water vortex can be applied in low head small hydropower plant, recently known as gravitational water vortex power plant. River off Gravitational Water Vortex power plant (GWVPP) is one of low head turbine that can be used to generate electricity in small scale, pico-hydro. This study is focus on basin geometry. Models are developed to investigate the outlet diameter, depth discharge and basin geometry. It is found out that parameter of the basin should refer to source, which are flow rate, and the head of the water. It shows that spiral geometry for the basin gives symmetric and strong vortex and can be used as an alternative of conical basin. © 2020 IEEE.

关键词： Geometry

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Low-Friction Soft Robots for Targeted Bacterial Infection Treatment in Gastrointestinal Tract

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Cyborg and Bionic Systems 2024年第1期5卷 162-176页

作者： Ben Wang Yunrui Chen Zhicheng Ye Haidong Yu Kai Fung Chan Tiantian Xu Zhiguang Guo Weimin Liu Li Zhang College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials School of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China Chow Yuk Ho Technology Centre for Innovative Medicine The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Key Laboratory of Biomedical Imaging Science and System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan 430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou 730000China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Multi-Scale Medical Robotics Center Hong Kong Science ParkShatinNew TerritoriesHong Kong SARChina

Untethered and self-transformable miniature robots are capable of performing reconfigurable deformation and on-demand locomotion,which aid the traversal toward various lumens,and bring revolutionary changes for targeted delivery in gastrointestinal(GI)***,the viscous non-Newtonian liquid environment and plicae gastricae obstacles severely hamper high-precision actuation and payload ***,we developed a low-friction soft robot by assembly of densely arranged cone structures and grafting of hydrophobic *** magnetic orientation encoded robot can move in multiple modes,with a substantially reduced drag,terrain adaptability,and improved motion velocity across the non-Newtonian ***,the robot stiffness can be reversibly controlled with magnetically induced hardening,enabling on-site scratching and destruction of antibiotic-ineradicable polymeric matrix in biofilms with a low-frequency magnetic ***,the magnetocaloric effect can be utilized to eradicate the bacteria by magnetocaloric effect under high-frequency alternating *** verify the potential applications inside the body,the clinical imaging-guided actuation platforms were developed for vision-based control and delivery of the *** developed low-friction robots and clinical imaging-guided actuation platforms show their high potential to perform bacterial infection therapy in various lumens inside the body.

关键词： gastrointestinal tract reconfigurable deformation targeted bacterial infection treatment low friction soft robots plicae gastricae obstacles assembly densely arranged cone structures targeted delivery grafting hy

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Corrections to “A Piecewise Monotonic Smooth Phase Variable for Speed-Adaption Control of Powered Knee-Ankle Prostheses”

引用

IEEE robotics and Automation Letters 2022年第4期7卷 11475-11475页

作者： Teng Ma Yuxuan Wang Xinxing Chen Chuheng Chen Zhimin Hou Haoyong Yu Chenglong Fu Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems and Guangdong Provincial Key Laboratory of Human Augmentation and Rehabilitation Robotics in Universities Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen China Department of Biomedical Engineering National University of Singapore Singapore

Firstly, in the letter [1], there is a missing citation in Section II, part B, the first sentence. It should be “In a manner similar to [2], [3], speed estimation was achieved by a double-pendulum model.” In our previous version [1], speed estimation was based on the principles in [3]. We also referred to the interpretation and expression form of 6 and 7 in [2], but did not cite this reference in [1]. It should be noted that the 9 in [1] is not the same as 5 in [2]. Because our prosthesis can measure the kinematic information of the hip, knee, and ankle, we considered using the kinematics of the three joints to estimate the velocity, instead of only using the angle hip and knee as in [2], therefore we additionally introduced the ankle angle in 9 of [1]. This led to changes in the lower extremity model used in our calculations and changes in the formula for calculating the stride length.

关键词： Prosthetics Robot sensing systems Phase measurement Biomedical measurement Thigh Noise measurement Legged locomotion

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Gravitational Water Vortex Hydropower: Experimental Investigation of Free Surface Wave in Water Intake Channel

Gravitational Water Vortex Hydropower: Experimental Investig...

引用

2020 International Conference on Sustainable Energy engineering and Application, ICSEEA 2020

作者： Huwae, Reza Susatyo, Anjar Subekit, Ridwan Arief Sudibyo, Henny Khaerudini, Deni Shidqi Mercu Buana University Program of Study Nagister in Mechanical Engineering Jakarta Indonesia Research Centre for Electrical Power and Mechatronics Bandung Indonesia Research Center for Physics Serpong Indonesia Department of Physics FMIPA Universitas Indonesia Depok Indonesia

ISBN: (纸本)9781728188492

Development program for construction of irrigation channel gives big opportunity for development of renewable energy from small low head hydropower source. The use of hydropower gives no negative impact to environment, especially for greenhouse emission. A gravitational vortex hydropower is the object of this study, with the focus on the water intake channel using rectangular geometry. An experimental study was conducted to find the influencing parameters on the intake section of the gravitational vortex hydropower. A set of parameters were varied to determine which parameters affecting the water surface at the intake channel. By analyzing the results of the experiments, the influence of parameters on the water intake channel of gravitational vortex hydropower was found. A performance curve for differentiation of flow type and identification of surface contour has been made. Based on the results of the experiment, placing a strainer at 5 cm distance gave 60% higher output power since this setting could reduce the wave speed. Recommendation to have further study in non-dimensional parametric should be considered for increasing efficiency of the gravitational vortex hydropower. © 2020 IEEE.

关键词： Vortex flow

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