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Topology optimization of rotating structures considering turbulent fluid–structure interaction problems and natural frequency constraints

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Structural and Multidisciplinary Optimization 2025年第5期68卷 1-25页

作者： Siqueira, Lucas O. Azevêdo, Anderson S. C. Silva, Emílio C. N. Picelli, Renato Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of the University of São Paulo Av. Prof. Mello Moraes São Paulo São Paulo 05508-030 Brazil Department of Naval Architecture and Ocean Engineering Polytechnic School of the University of São Paulo Av. Prof. Mello Moraes São Paulo São Paulo 05508-030 Brazil

Optimization tools have been increasingly gaining ground in the design of turbomachinery components. However, there is a noticeable lack of studies applying topology optimization to design these types of equipment. Enhancing the design of these components is crucial to reducing vibration levels and extending their useful life. This study focuses on topology optimization of rotating structures considering turbulent swirl flow and natural frequency constraints. The proposed optimization problem aims to minimize compliance while adhering to volume and natural frequency constraints, specifically targeting the three lowest natural frequencies. The governing equations are solved using separate domains: the incompressible Reynolds-Averaged Navier–Stokes (RANS) equations with the k-ω turbulence model for the fluid and linear elasticity with 2D axisymmetry for the solid. The optimization is carried out using the Topology Optimization of Binary Structures with Geometry Trimming (TOBS-GT) method, which employs discrete (binary) design variables. Two numerical examples are explored: the rotating wall and the multiple rotating structures. The rotating wall example investigates the penalization factor, rotational speed, and natural frequency constraint influence in the optimized designs. In addition, the multiple rotating structures example explores the effects of rotational speed, natural frequency constraint, and positive internal pressure within the channel. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Binary design variables Fluid–structure interaction Frequency constraints Rotor design Swirl flow TOBS-GT Topology optimization

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An approach based on multiquadric radial basis functions for smooth trajectory planning of robotic manipulators with kinematic constraints

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Nonlinear Dynamics 2025年 1-19页

作者： Bendali, Nadir Scalera, Lorenzo Sundaram, Arunachalam Said, Abderrezak Gasparetto, Alessandro Faculty of Science and Technology Khemis Miliana University Road of Theniet El Had Khemis Miliana44225 Algeria Structural Mechanics Research Laboratory Department of Mechanical Engineering University Blida-1 BP 270 Route Soumâa Blida09000 Algeria Polytechnic Department of Engineering and Architecture University of Udine via delle Scienze 206 Udine33100 Italy School of Science Engineering and Environment University of Salford SEE Building SalfordM5 4WT United Kingdom

This paper introduces a novel approach for planning smooth trajectories of robotic manipulators by leveraging multiquadric radial basis functions (MQ-RBFs). The proposed approach aims to achieve optimal trajectories by minimizing a multi-objective function that accounts for both time and jerk optimization. The MQ-RBF interpolation technique ensures that the trajectory meets velocity, acceleration, and jerk limits, while ensuring jerk continuity. Comparative evaluations are conducted in two cases: with and without optimization. In the first case, the MQ-RBF interpolation approach is compared with various RBF interpolation models. In the second case, the MQ-RBF trajectory approach is compared with alternative state-of-the-art trajectory planning techniques, such as fifth-order B-splines and trigonometric spline functions, for generating optimal time-jerk trajectories for 6-joint robotic manipulators using optimization algorithms. Numerical and experimental results demonstrate the superior performance of the proposed technique in efficiently planning smooth trajectories compared to existing trajectory planning approaches and validate its effectiveness across various scenarios. © The Author(s) 2025.

关键词： Interpolation

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An analysis of model testing and finite element approach for distribution of earth pressures

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Alexandria engineering Journal 2025年 127卷 18-33页

作者： Liu, Jungang Liang, Feng Chen, Geng Department of Civil Engineering College of Civil Engineering and Architecture at the Hubei Polytechnic University No.16 North of Guilin Road K8-303 Hubei Huangshi435003 China Center for Geotechnical Engineering Science University of Colorado Denver 923 South Fairplay Street AuroraCO80012 United States Department of Civil Engineering University of Colorado Denver 923 South Fairplay Street AuroraCO80012 United States

This study presents a comprehensive comparison of laboratory experiments and numerical simulations using finite element analysis (FEA) to investigate the effects of various geotextile spacing on the distribution of earth pressure. The experiments were conducted in the "Tiger Cage (TC)" testing facility at the University of Colorado Denver's (UCD) Geotechnical engineering Science Center. A total of four large-scale tests were performed on Leyden Clay (LC) and Colorado department of Transportation Class 1 Structure Backfill Material (CDOT Class 1 SBM) to validate the finite element model. The research focuses on the distribution of earth pressure on Leyden Clay and CDOT Class 1 SBM, validated through large-scale physical tests and 3D FEA simulations performed using the LS-DYNA and ABAQUS software. The results demonstrate the accuracy of numerical models in predicting earth pressure distributions, with strong correlations observed between experimental data and simulation results. The study reveals that the current method provision is inaccurate in predicting earth pressure distribution at the bottom of the wall, as the predicted data from numerical models show the highest earth pressures of 485Kpa around two-thirds of the wall height (150 cm). This research provides valuable insights into soil-structure interaction, contributing to the design and analysis of retaining walls and foundations in geotechnical engineering. © 2025 The Authors

关键词： ABAQUS

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The Role of Interface Parameters for the Accurate Numerical Modeling of the Mechanical Behavior of TRM Composites 18th

The Role of Interface Parameters for the Accurate Numerical ...

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18th International Brick and Block Masonry Conference, IB2MaC 2024

作者： Giordano, E. Masciotta, M.G. Clementi, F. Ghiassi, B. Department of Civil Engineering Faculty of Engineering McGill University MontréalQCH3A0C3 Canada Department of Engineering and Geology University "G. d’Annunzio" of Chieti-Pescara viale Pindaro 42 Pescara65127 Italy Department of Civil and Building Engineering and Architecture Polytechnic University of Marche via Brecce Bianche 12 Ancona60131 Italy Department of Civil Engineering University of Birmingham BirminghamB15 2TT United Kingdom

ISBN: (纸本)9783031733093

The preservation and seismic risk mitigation of unreinforced masonry heritage remains a hot topic in structural research. Poor tensile strength, low ductility, irregular texture and lack of transverse connections are among the main causes of the high vulnerability and fragile behavior of historic masonry structures under seismic loading. Aiming to increase the resilience of the built environment to exceptional and unpredicted events, from past three decades the research community has been focusing its attention on investigating the best and durable retrofitting solutions to improve the structural capacity of masonry artefacts. Among the different techniques proposed in the technical literature, the Textile-Reinforced Mortar (TRM) is gaining a growing consensus. TRM composites are a combination of inorganic matrices and high-strength fibers. Thanks to its characteristics of vapor permeability, heat resistance, easy workability and compatibility with many substrate materials, TRM is currently recognized as the most appropriate reinforcement for historic masonry. Nevertheless, many uncertainties still arise about its mechanical behavior due to the complex interactions among its components (fiber and matrix) as well as between the TRM and the substrate to which it is applied. The present study aims to investigate from a numerical viewpoint the TRM three-dimensional behavior and, particularly, the key mechanical parameters necessary for the correct simulation and prediction of its response. This is achieved by replicating a wide multi-scale experimental campaign making use of 3D continuum numerical micro models where each component, including interfaces, is represented separately. The numerical simulation of the tests, carried out by employing consistent parameters throughout the modeling scales, brought to light novel knowledge concerning the minimum number of experiments needed to properly model the behavior of TRM composites. © The Author(s), under exclusive license t

关键词： Tensile strength

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An advanced BPNN/RVEA coupled control strategy for novel immersed liquid cooling battery thermal management system

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Journal of Energy Storage 2025年 125卷

作者： Wu, Yongxi Yuen, Anthony Chun Yin Mo, Chongmao Chen, Qian Huang, Xinyan Department of Building Environment and Energy Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Department of Architecture and Civil Engineering City University of Hong Kong Hong Kong

This study introduces a novel distributed-inlet circulatory immersion liquid cooling (DIC-IC) battery thermal management system (BTMS), optimised using computational fluid dynamics (CFD), backpropagation neural networks (BPNN), and the reference vector-guided evolutionary algorithm (RVEA). The BPNN model accurately predicted maximum temperature Tmax, temperature difference ΔTmax, and input power. Multi-objective optimisation (MOO) achieved a 24 % reduction in Tmax to 30.13 °C and a 70 % reduction in ΔTmax to 3.58 °C with power consumption of only 0.7 m3/s3, significantly reducing energy usage by up to 95 % compared to initial designs. Dynamic cooling strategies, including static, equilibrium, and boost modes, were proposed to address various operational conditions. The boost mode reduced Tmax and ΔTmax by an additional 5.9 % and 4.3 % respectively under 5C discharge, demonstrating superior thermal safety. These findings provide a practical framework for efficient and low-energy BTMSs that enhance the performance of lithium-ion batteries in high-power density and high-temperature applications. © 2025 Elsevier Ltd

关键词： Lithium-ion batteries

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Investigation of the Impacts of Aircraft Acoustics

Investigation of the Impacts of Aircraft Acoustics

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International Conference on Systems, Control and Automation, ICSCA 2023

作者： Sharma, Bharat Bhushan Sharma, Naveen Kumar Banshwar, Anuj Sharma, Raj Kumar Department of Electronics and Communication Engineering JSS Academy of Technical Education Noida Gautam Buddha Nagar Uttar Pradesh Noida201301 India Electrical Engineering Department IKG Punjab Technical University Punjab Kapurthala India Electrical Engineering Department Government Polytechnic Uttar Pradesh Puranpur India School of Architecture and Planning Apeejay Institute of Technology Gautam Buddha Nagar Uttar Pradesh Greater Noida India

ISBN: (纸本)9789819773831

The work deals with the analysis of effect of aircraft acoustics on human. In this study, measurement and analysis of cargo and fighter aircraft noise at close vicinity of a military airbase was done with sound measurement device. The results shows that noise level during takeoff and landing is greater than 85 dB and people living near to close vicinity of military airbase. To support this work, population-based questionnaire technique and a field study was designed. In population-based questionnaire study, 50 nearby residents were given the questionnaire and 45 residents returned back the filed questionnaire. This research included responses from long-term inhabitants of a military airfield. In addition, human individuals were subjected to three-day controlled research with 90-min sessions each day. Thirty volunteers took part in the field study and reported their opinions on irritation, speech interruption, and perception. The investigation reveals a substantial relationship between the total irritation response and the acceptance of aeroplane noise. The amount of responses demonstrates that people are severely or extremely irritated by aeroplane noise. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Fighter aircraft

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Application of recycled high-density polyethylene for construction of non-structural wattle and daub walls

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Interactions 2025年第1期246卷 1-14页

作者： Ceolin, Valdomiro Neto Gomes, Maria Idália Oliveira, Francisco Louro, Margarida Research Centre for Architecture Urbanism and Design Lisbon School of Architecture CIAUD Universidade de Lisboa Rua Sá Nogueira Polo Universitário do Alto da Ajuda Lisboa1349-063 Portugal Department of Civil Engineering CERIS Nova School of Science and Technology Campus de Caparica Caparica2829-516 Portugal Instituto Superior de Engenharia de Lisboa ISEL Polytechnic Institute of Lisbon Rua Conselheiro Emídio Navarro 1 Lisboa1959-007 Portugal

The evolution of construction techniques has spanned millennia, integrating locally sourced materials with innovative technological advancements. The use of earth in construction demonstrates remarkable versatility, exhibiting plasticity when wet and robust solidity upon drying. The environmental sustainability and abundant availability of earth further reinforce its role in architectural practices. This research explores the integration of recycled thermoplastic technology with traditional earthen construction methods, focusing on non-structural walls combining thermoplastic frameworks and mixed earth techniques. The study places particular emphasis on recycled High-Density Polyethylene (r-HDPE), a material that has garnered acclaim for its role in sustainable development through the reuse of secondary raw materials and its high moldability. The primary function of r-HDPE in this context is as a supplemental framework supporting earthen materials. Utilizing recycling and production methods from Precious Plastic, the research emphasizes the prototyping of r-HDPE structures with diverse configurations, digitally designed to create components ranging from beams to intricate truss networks. The earthen mortar comprises fine and coarse sand, wheat straw, and lime, adhering to traditional mixed earth construction practices. While the materials share structural limitations with conventional mixed earth methods, the potential addition of composites to thermoplastics could improve strength but hinder mechanical recyclability, favoring chemical recycling as an alternative. This study prioritizes recyclability with minimal environmental impact, limiting its scope to mechanical recycling without composite additives. The objective of this study is to achieve a balance between innovative applications of recycled thermoplastics and long-term environmental stewardship, thereby enhancing the synergy between sustainability and construction practices. © The Author(s) 2025.

关键词： Walls (structural partitions)

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Asymmetric sway panel design for noise reduction by modal radiation efficiency tunning approach

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Applied Acoustics 2025年 238卷

作者： Wei, Sheng Li, Ying Qiao, Xiaoru Lee, Yiuyin Choy, Yatsze Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Department of Architecture and Civil Engineering City University of Hong Kong Kowloon Tong Kowloon Hong Kong

Built-up panels are widely employed for noise reduction, with their effectiveness primarily dependent on transverse vibrations, as corroborated by numerous studies. Transverse vibrations occur perpendicular to the panel's surface and are known for their substantial sound radiation. This study introduces a novel technique for tuning modal radiation efficiency, designed to diminish sound radiation from a sway panel comprised of two vertical and one horizontal segment. Notably, when the primary vibration direction of a panel is parallel to its surface (i.e., sway vibration), both the level of transverse vibrations and the corresponding sound radiation efficiency are significantly reduced. A theoretical model was developed to investigate the interplay between transverse and longitudinal vibrations across adjacent components, shedding light on the sound radiation reduction mechanism. The sway structure exhibited a 43.5 % reduction in maximum transverse displacement compared to a simply supported beam, while the maximum longitudinal displacement was adjusted to align with the transverse displacement levels. Moreover, sway modes, in comparison to simply supported beams, demonstrate reduced radiation efficiency due to their dipole-like sound radiation patterns. Consequently, the maximum sound pressure level of the sway structure was lowered by 7 dB compared to that of the simply supported beam. This model also enables the creation of two sway modes with closely spaced frequencies through precise modifications of lengths and thicknesses, highlighting the significance of asymmetric geometry. Furthermore, comparisons of the proposed model with finite element methods and experimental results confirm a strong concordance, validating the effectiveness of the sway structure in achieving reduced sound radiation. © 2025 Elsevier Ltd

关键词： Structural panels

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Fire safety regulations in Brazil: Analysis of the occupancy classification of buildings

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architecture, Structures and Construction 2025年第1期5卷 1-13页

作者： de Lourdes Ferreira Minervino, Bernardete dos Santos, Cristina Calmeiro von Krüger, Paulo Gustavo Rodrigues, João Paulo C. Department of Civil Engineering University of Coimbra Coimbra Portugal School of Civil Engineering Polytechnic Institute of Castelo Branco Castelo Branco Portugal Department of Architecture Urbanism and Design Technology University of Minas Gerais Belo Horizonte Brazil

Fire safety in a building depends on several factors, including its use and occupancy, which fire protection systems are present in the building and the state of maintenance of these systems. Considering the fact that Brazil has 27 federal states and each of them has its own fire safety legislation, it is common for there to be divergences that result in different protection requirements depending on the state where the building is located. This study analyzes Brazilian state fire safety legislation with regard to the sizing of fire protection systems for buildings, considering the parameters used for such sizing. It then identifies the differences in classification in terms of the use and occupation of buildings in the 27 federal states; and presents a proposal for a standardized classification for the whole country, taking into account the convergences that already exist in state legislation. The main objective is to suggest a discussion starter for the process of standardizing fire safety parameters in Brazil.

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Simulation Based Test Rig for Acoustic Source Perception

Simulation Based Test Rig for Acoustic Source Perception

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International Conference on Systems, Control and Automation, ICSCA 2023

作者： Sharma, Naveen Kumar Sharma, Bharat Bhushan Sharma, Raj Kumar Banshwar, Anuj Electrical Engineering Department I. K. Gujral Punjab Technical University Main Campus Punjab Kapurthala India Department of Electronics and Communication Engineering JSS Academy of Technical Education Gautam Buddha Nagar Uttar Pradesh Noida India School of Architecture and Planning Greater Apeejay Institute of Technology Gautham Buddha Nagar Uttar Pradesh Noida201301 India Electrical Engineering Department Government Polytechnic Uttar Pradesh Puranpur India

ISBN: (纸本)9789819773831

The simulation work presented in this work deals with the generation of acoustic effects with various available software tools. Generally, Audacity software is used for generation of different sound events such as simple tone, chirp, pink noise, white noise, etc. This software can be further utilized for performing acoustic related experiments on human. In this work, software-based test rig is created for performing listening test for analysis of the sound perception by various subjects. This listening test aims to rate the quality of a set of signals produced by source separation systems. This work helped in analysing that how perception of sound is affected. Software based test rig is created for performing listening test for analysis of the sound perception by various subjects. The purpose of this listening evaluation is to assess the level of a collection of signals generated by source separation systems. Source separation seeks to isolate a target source’s signal from a mashup of many sound sources. When contrasted to the pure target source, the generated signals may exhibit a variety of degradations, such as target source distortions, residual noises from other sources, and extra artificial noise. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Background noise

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