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International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Afia Rasool Qipei Mei Rafiq Ahmad Department of Mechanical Engineering Smart & Sustainable Manufacturing Systems Laboratory (SMART Lab) University of Alberta Edmonton Canada Department of Civil and Environmental Engineering University of Alberta Edmonton Canada

ISBN: (数字)9798350355703

ISBN: (纸本)9798350355710

With the development of Construction 4.0 and digital technologies, off-site construction has evolved and become a practical choice for rapid construction. In today's fast-paced manufacturing framework, there is a need to automate every construction step, especially the design and analysis phases of mass timber panel manufacturing, as these two steps are highly expert's dependent. This study summarizes a case to design multiple variants of mass timber panels using parametric and generative modeling. Integrating these technologies helps create speedy and tailored design solutions in the automation setting. A building information modeling (BIM) based on a 3D parametric design of a timber panel is generated, followed by optimizations via generative design. Focusing on the Canadian construction industry, different types of mass timber are examined to analyze and optimize design features such as stud width, stud bays, and weight-bearing capacity. This study aims to support customization and adaptability at the yield of less time and effort for ongoing industrial automation.

关键词： Solid modeling Automation Three-dimensional displays Service robots Computational modeling Buildings Reliability theory Reliability engineering Manufacturing Planning

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Online Min Cost Circulation for Multi-Object Tracking on Fragments

Online Min Cost Circulation for Multi-Object Tracking on Fra...

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International Conference on Intelligent Transportation

作者： Yanbing Wang Junyi Ji William Barbour Daniel B. Work Department of Civil and Environmental Engineering Institute for Software Integrated Systems Vanderbilt University Nashville TN USA

Multi-object tracking (MOT) or global data association problem is commonly approached as a minimum-cost-flow or minimum-cost-circulation problem on a graph. While there have been numerous studies aimed at enhancing algorithm efficiency, most of them focus on the batch problem, where all the data must be available simultaneously to construct a static graph. However, with the growing number of applications that generate streaming data, an efficient online algorithm is required to handle the streaming nature of the input. In this paper, we present an online extension of the well-known negative cycle canceling algorithm for solving the multi-object tracking problem with streaming fragmented data. We provide a proof of correctness for the proposed algorithm and demonstrate its efficiency through numerical experiments.

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Propellant Venting in Vacuum: Experiment and Model

Propellant Venting in Vacuum: Experiment and Model

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

作者： Desain, John D. Aroutiounian, Armen G. Bendana, Fabio A. Perezselsky, Armando A. Cortopassi, Andrew C. Warrier, Gopinath R. Dragnea, Horatiu C. Chemical Propulsion & Environmental Science Dept. Engineering and Technology Group The Aerospace Corp. El SegundoCA90245 United States Fluid Mechanics Dept. Engineering and Technology Group The Aerospace Corp. El SegundoCA90245 United States Human Exploration & Spaceflight Civil Systems Group The Aerospace Corp. HoustonTX77058 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The Lunar Gateway is designed for in-space refueling, and follow-on venting of the transfer lines. Rapid expansion of liquid propellant to vacuum can lead to freezing, thus blocking the vent path. The complex physics demands that the venting procedure be verified by test. The Aerospace Corporation has performed initial de-risking activities including fluid venting experiments in vacuum to validate test setup and experimental equipment. The testing demonstrated low freezing likelihood for fuel venting, but high likelihood for oxidizer. Water and kerosene were used as analogs for monomethyl hydrazine (MMH) fuel, and no freezing was observed. A follow-on campaign with nitrogen tetroxide oxidizer was also performed, and in this case, freezing was observed. To complement these experimental studies, a Thermal Desktop model was developed to simulate the fluid flow and heat transfer during venting. The model was then anchored to the experimental values and provided good agreement with the experimental results for water and nitrogen tetroxide (NTO). © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Liquid propellants

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Ultrastable MOF-based foams for versatile applications

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Nano Research 2022年第4期15卷 2961-2970页

作者： Qian Hu Licong Xu Kaixing Fu Feichao Zhu Taoyu Yang Tao Yang Jinming Luo Minghua Wu Deyou Yu Engineering Research Center for Eco-Dyeing and Finishing of Textiles Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China Brook Byers Institute for Sustainable Systems School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlanta 30332USA School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan UniversityChangsha 410082China Institute for Nanomaterials Advanced Technologies and InnovationTechnical University of LiberecLiberec 46117Czech Republic Zheijiang Sci-Tech University Tongxiang Research Institute Tongxiang 345000China

Metal-organic frameworks(MOFs)are attractive for promising applications but plagued by difficult recovery and deployment due to their intrinsic nano/micro powder *** significant efforts have been made to develop separable solid matrixes for MOF supporting,the poor loading stability and durability of MOFs still challenge their engineering ***,we present a facile and effective approach to fabricate MOF-based melamine foams(MFs)(denoted as MOFiths)with ultrahigh loading stability and operation stability,easy separation,and high-efficient performance for versatile robust *** adopting our approach,numbers of typical fragile MOFs characterized with wide ranges of particle size(from~nm to~μm)can be precisely incorporated into MFs with controllable loading ratios(up to~1,600%).Particularly,the produced MOFiths show excellent capacities for the highly effective and durable water purifications and acetalization reactions.100%of organic pollutants can be rapidly destructed within 10 min by MOFiths initiated Fenton or catalytic ozonation processes under five successive cycles while the maximum adsorption capacity of MOFiths toward Pb(II),Cd(II),and Cu(II)reaches to 422,222,and 105 mg·g^(-1),*** study provides a critical solution to substantially facilitate the engineering applications of MOFs for long-term use in practice.

关键词： metal-organic framework melamine foam ultrastability versatile applications long-term use

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Optimizing Multi-Timestep Security-Constrained Optimal Power Flow for Large Power Grids

arXiv

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arXiv 2023年

作者： Sharadga, Hussein Mohammadi, Javad Crozier, Constance Baker, Kyri Civil Architectural and Environmental Engineering The University of Texas at Austin AustinTX United States Industrial and Systems Engineering Georgia Institute of Technology Georgia United States Civil Environmental and Architectural Engineering University of Colorado BoulderCO United States

This work proposes a novel method for scaling multi-timestep security-constrained optimal power flow in large power grids. The challenge arises from dealing with millions of variables and constraints, including binary variables and nonconvex, nonlinear characteristics. To navigate these complexities, techniques such as constraint relaxation, linearization, sequential optimization, and problem reformulation are employed. By leveraging these methods, complex power grid problems are solved while achieving high-quality solutions and meeting time constraints. The innovative solution approach showcases great robustness and consistently outperforms benchmark standards. © 2023, CC BY-NC-SA.

关键词： Electric load flow

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Assessing Robustness and Vulnerability in Interdependent Network Infrastructure: A Multilayer Network Approach

Assessing Robustness and Vulnerability in Interdependent Net...

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Annual Symposium on Reliability and Maintainability (RAMS)

作者： Phat K. Huynh M Mishkatur Rahman Om P. Yadav Trung Q. Le Chau Le Department of Industrial & Management Systems Engineering University of South Florida Department of Industrial and Manufacturing Engineering North Dakota State University Department of Industrial and Systems Engineering North Carolina A&T State University Department of Civil Construction and Environmental Engineering North Dakota State University

Modern societies profoundly depend upon interdependent critical infrastructure systems, such as the power grid, oil pipeline, gas pipeline, and transportation system, for proper functioning. These systems are extensively interconnected, characterized by their interconnected layers of infrastructures, which presents unique complexities that can complicate their analysis. Furthermore, if one system fails, it can have a ripple effect throughout the entire network. Hence, it is crucial to evaluate the robustness and vulnerability of interdependent critical infrastructure systems with complex inter-layer and intra-layer dependencies to ensure their continued operation and after-math resilience. In response to these challenges, this study presents a method for evaluating the robustness, vulnerability, and efficiency of multi-layer infrastructures using various probabilistic evaluation measures. We considered three key parameters: the number of nodes (N), the denseness of network connections (DL), and node failure probability (p). We modeled these complex systems using Erdos-Renyi graphs and investigated the impact of three parameters: N, DL, and p. We considered two network sizes, N = 50 and N = 100, each divided into two layers with equal nodes. The DL and $p$ parameters represent the distinct characteristics of different infrastructures, which are considered independently for each layer. We simulated four scenarios varying DL and $p$ across layers and examined the topological transformations induced by these variations. The results indicated that a larger network size generally enhances network robustness and efficiency while reducing vulnerability, highlighting the importance of considering network size in multi-layer network design. Also, the interplay between DL and $p$ significantly influences network behavior, with a high DL mitigating the impact of high node failure probabilities on network robustness. These insights offer valuable guidelines for improving n

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FT-AED: Benchmark Dataset for Early Freeway Traffic Anomalous Event Detection

arXiv

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arXiv 2024年

作者： Coursey, Austin Ji, Junyi Quinones-Grueiro, Marcos Barbour, William Zhang, Yuhang Derr, Tyler Biswas, Gautam Work, Daniel B. Institute for Software Integrated Systems United States Department of Computer Science Department of Civil and Environmental Engineering Vanderbilt University United States

Early and accurate detection of anomalous events on the freeway, such as accidents, can improve emergency response and clearance. However, existing delays and errors in event identification and reporting make it a difficult problem to solve. Current large-scale freeway traffic datasets are not designed for anomaly detection and ignore these challenges. In this paper, we introduce the first large-scale lane-level freeway traffic dataset for anomaly detection. Our dataset consists of a month of weekday radar detection sensor data collected in 4 lanes along an 18-mile stretch of Interstate 24 heading toward Nashville, TN, comprising over 3.7 million sensor measurements. We also collect official crash reports from the Nashville Traffic Management Center and manually label all other potential anomalies in the dataset. To show the potential for our dataset to be used in future machine learning and traffic research, we benchmark numerous deep learning anomaly detection models on our dataset. We find that unsupervised graph neural network autoencoders are a promising solution for this problem and that ignoring spatial relationships leads to decreased performance. We demonstrate that our methods can reduce reporting delays by over 10 minutes on average while detecting 75% of crashes. Our dataset and all preprocessing code needed to get started are publicly released at https://***/ft-aed/to facilitate future research. Copyright © 2024, The Authors. All rights reserved.

关键词： Anomaly detection

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Constrained CAV Control for Mixed Vehicular Platoons Via Gain Parameterizations and Padé Approximations

Constrained CAV Control for Mixed Vehicular Platoons Via Gai...

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IEEE Conference on Decision and Control

作者： MirSaleh Bahavarnia Junyi Ji Ahmad F. Taha Daniel B. Work Department of Civil and Environmental Engineering Vanderbilt University 2201 West End Avenue Nashville TN USA Institute for Software Integrated Systems

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

The key objective of the connected and automated vehicle (CAV) platoon control problem is to regulate CAVs’ position while ensuring stability and accounting for vehicle dynamics. The unconstrained version of this problem has thoroughly been investigated in the literature. We elaborate on the constrained version of this problem to theoretically mitigate the two shortcomings of the unconstrained counterpart: $(i)$ the synthesis of unrealistic high-gain control parameters due to the lack of a systematic way to incorporate the lower and upper bounds on the control parameters, and (ii) the performance sensitivity to the communication delay due to inaccurate Taylor series approximation. The former is mitigated via a systematic parameterization of the control gains based on the Hurwitz stability criterion. The latter is mitigated by taking advantage of the well-known Padé approximation. The usefulness of the proposed theoretical results is assessed by performing numerous numerical simulations. Furthermore, a thorough comparative analysis is empirically conducted between the constrained and unconstrained versions of the CAV platoon control problem with application to the mixed vehicular platoon. Modern transportation systems will benefit from the proposed CAV controls by effectively attenuating the stop-and-go disturbance—a single cycle of deceleration followed by acceleration—amplification throughout the mixed vehicular platoon as it will potentially reduce collisions.

关键词： Systematics Upper bound Sensitivity Stability criteria Transportation Taylor series Numerical simulation Delays Vehicle dynamics Numerical stability

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Torsional Performance of Vat-Photopolymerized Tough Resins: Influences of Gauge Length and Uv Post-Curing

SSRN

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SSRN 2024年

作者： Sadaghian, Hamed Khalilzadehtabrizi, Sahand Khodadoost, Saeed Yeon, Jung Heum School of Architecture Building and Civil Engineering Loughborough University LoughboroughLE11 3TU United Kingdom Department of Civil and Environmental Engineering Centre for Infrastructure Systems Engineering University of Surrey Guilford United Kingdom Department of Civil Engineering University of Tabriz Tabriz Iran Civil Engineering Program Ingram School of Engineering Texas State University San MarcosTX78666 United States

A myriad of materials, ranging from soft sensors to bone substitutes, undergo torsional loading throughout their operational lifespan, often produced using additive manufacturing (AM) technology due to its broad applicability. Understanding the torsional behavior of these AM components is paramount prior to their utilization. However, research concerning the torsional behavior of solid additively-manufactured resin polymers remains limited. To bridge this gap, 48 torsion specimens were fabricated using vat photopolymerization (VPP) with AnyCubic UV Tough Resin. These specimens varied in gage lengths (20, 40, 60, and 80 mm) and were subjected to five UV post-curing durations (0, 15, 30, 60, 90, and 120 minutes). Monotonic torsion was applied until failure at a rate of 0.1 revolutions per minute, revealing ductile failure patterns across specimens. Longer post-curing times correlated with increased torsional capacities and shear moduli, although conclusions regarding energy absorption per unit volume remained inconclusive. Additionally, a normalized trilinear model was proposed to characterize the behavior of additively-manufactured resin polymers under monotonic torsion, facilitating numerical simulation of material responses in finite element software. © 2024, The Authors. All rights reserved.

关键词： Torsional stress

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Towards an Ontology for BIM-Based Robotic Navigation and Inspection Tasks 38

Towards an Ontology for BIM-Based Robotic Navigation and Ins...

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38th International Symposium on Automation and Robotics in Construction, ISARC 2021

作者： Bahreini, F. Hammad, A. Department of Building Civil and Environmental Engineering Concordia University Canada Concordia Institute for Information Systems Engineering Concordia University Canada

ISBN: (纸本)9789526952413

The availability of inspection robots in the construction and operation phases of buildings has led to expanding the scope of applications and increasing technological challenges. Furthermore, the Building Information Modeling (BIM) based approach for robotic inspection is expected to improve the inspection process as the BIM models contain accurate geometry and relevant information at different phases of the lifecycle of a building. Several studies have used BIM for navigation purposes. However, the research in this area is still limited and fragmented, and there is a need to develop an integrated ontology to be used as a first step towards logic-based inspection. This paper aims to develop an Ontology for BIM-based Robotic Navigation and Inspection Tasks (OBRNIT). The semantic representation of OBRNIT was evaluated through a case study. The evaluation confirms that OBRNIT covers the domain’s concepts and relationships, and can be applied to develop robotic inspection systems. © 2021 Proceedings of the International Symposium on Automation and Robotics in Construction. All rights reserved.

关键词： Navigation

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