Article
Mechanics
Tejasree Phatak, Kalyana B. Nakshatrala
Summary: Topology optimization provides optimal material layouts for automated device design, but traditional models neglect internal friction. This study introduces a material design framework based on the Darcy-Brinkman model, investigating the impact of viscous shearing stresses on the design.
Article
Mechanics
Kalyana B. Nakshatrala
Summary: This study provides a theoretical analysis of material design problems for fluid flow through porous media using the adjoint state method. The results offer rigorous answers to how to pose such design problems and have significant implications for computational material design.
Article
Construction & Building Technology
Sen Lin, Genbao Zhang, Junbo Sun, Shilin He, Changfu Chen, Amr M. Morsy, Xiangyu Wang
Summary: This paper presents an optimization algorithm for maximizing band-gap in cementitious composite design. Experimental and numerical analysis revealed the correlation between composite porosity and band structure. Results showed that specific material composition can achieve sound absorption coefficient exceeding 90% in a phononic crystal structure, with frequency consistent with theoretical band gap analysis.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Civil
Jie Hu, Weibai Li, Jiachun Li, Xing Chen, Song Yao, Xiaodong Huang
Summary: This paper proposes a new topology optimization approach for the design of porous acoustic-mechanical structures. The effectiveness of the method is verified through numerical examples considering both mechanical and acoustic characteristics. The results show that the resulting porous features improve the acoustic performance of the optimized designs.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Van-Nam Hoang, Xuan Wang, H. Nguyen-Xuan
Summary: This paper presents a direct multiscale design approach for 3D porous structures by using adaptive geometric components to describe the macrostructure and microstructure of materials, and utilizing multiresolution topology optimization to reduce the cost of finite element analysis. Optimization of geometry parameters simultaneously optimizes the overall macrostructure and microstructure of materials.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
L. L. Chen, H. Lian, Z. Liu, Y. Gong, C. J. Zheng, S. P. A. Bordas
Summary: This paper introduces a novel method for topology optimization of vibrating structures interacting with acoustic waves to minimize radiated sound power. Using Catmull-Clark subdivision surfaces to construct geometries and the isogeometric finite element method with Kirchhoff-Love shell elements, coupled with the isogeometric boundary element method in acoustics, the topology optimization is performed with density-based approaches and sensitivity evaluation using adjoint variable methods. Numerical experiments validate the algorithm's effectiveness for optimizing structural-acoustic interaction systems.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Computer Science, Interdisciplinary Applications
Rodrigo L. Pereira, Heitor N. Lopes, Marcio S. Moura, Renato Pavanello
Summary: This study presents a multi-domain acoustic topology optimization approach for the design of reactive and dissipative expansion chamber mufflers. The proposed method utilizes the Bi-directional Evolutionary Structural Optimization (BESO) algorithm and a novel material interpolation scheme, considering acoustic, porous, and rigid domains during the optimization process. Results show that this method significantly enhances the mean value of sound Transmission Losses (TL) in a broad frequency range, as well as presenting clear optimized partitions.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Mechanics
Xiaopeng Zhang, Yan Li, Yaguang Wang, Yangjun Luo
Summary: This study proposes a systematic topology optimization method of multi-material acoustic metamaterial to open single and multiple low-frequency bandgaps. The optimization model introduces new objective functions to evaluate the low-frequency bandgaps effectively. By adopting the material-field series expansion (MFSE) technique and the discrete material optimization (DMO) scheme, a clear three-material topology can be determined with only 100 independent design variables. The proposed topology optimization method can effectively provide acoustic metamaterial designs with ultra-wide low-frequency bandgaps and obtain both Bragg scattering and local resonance mechanisms without any additional settings.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Jinwoo Choi, Juwon Hong, Taehoon Hong
Summary: A mathematical model was developed to determine the most effective arrangement for noise barriers in order to manage construction noise during earthwork. The model considered factors such as reducing health damage, productivity loss, and costs. The use of spatiotemporal data was verified in a case study to ensure the accuracy of the model. The optimized noise barrier arrangement resulted in a significant reduction in health damage while incurring only minor productivity loss and costs.
AUTOMATION IN CONSTRUCTION
(2023)
Article
Instruments & Instrumentation
Yawen Wei, Pei Huang, Zhen Li, Pengfei Wang, Xiangchao Feng
Summary: This study proposes a multi-material topology optimization approach for the design of PACs to achieve a target shape. By establishing a multi-material interpolation function and using continuum mechanics modeling, along with sensitivity analysis using the adjoint method, effective results are achieved in designing PACs with complex shapes.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Acoustics
Zhaoyu Li, Xiaoyuan Hou, Yibo Ke, Meng Tao
Summary: This paper investigates the use of topology optimization with genetic algorithm to design scatterer structures in porous materials for improving low-frequency sound absorption performance. The optimized structures achieved high absorption coefficients in the frequency range of 200-1600 Hz. The results were validated through experiments and simulations, providing design ideas for future acoustic materials.
Article
Engineering, Mechanical
Lan Liu, Kun Kang, Yingjie Xi, Zhengxi Hu, Jingyi Gong, Geng Liu
Summary: This study proposes a low-noise design method for a gearbox that combines contribution analysis and structure optimization, and verifies its effectiveness through experiments. By establishing a model, analyzing acoustic contribution, and performing topology optimization, the low-noise design for the gearbox is achieved. The validity of the method is verified by comparing simulation and experimental data.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Naruethep Sukulthanasorn, Hiroya Hoshiba, Koji Nishiguchi, Mao Kurumatani, Robert Fleischhauer, Kuniharu Ushijima, Michael Kaliske, Kenjiro Terada, Junji Kato
Summary: This paper presents a two-scale topology optimization framework for determining the optimal microstructure in porous material under transient heat conduction and transfer. The proposed optimization model can consider the surface area directly from microstructure topology to enhance heat transfer performance.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Lior Aharoni, Ido Bachelet, Josephine Carstensen
Summary: This paper introduces a new density-based topology optimization algorithm for designing constructible rigid interlocking assemblies with multiple components, ensuring blocking of rigid body motion and sufficient assemblability. The structural performance is simplified into a set of static load cases to estimate intercomponent interactions. The framework is demonstrated on design examples with two and four components, achieving interlocking, constructible assemblies with crisp interface boundaries and interaction loads along the component interfaces.
COMPUTERS & STRUCTURES
(2021)
Article
Computer Science, Interdisciplinary Applications
Stephen W. K. Roper, Haksung Lee, Mongyoung Huh, Il Yong Kim
Summary: The aerospace industry is constantly seeking breakthroughs in lightweight design by integrating advanced materials and manufacturing methods. This paper presents practical examples of multi-material topology optimization in aerospace, including the first simultaneous application of isotropic and orthotropic material models.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Review
Environmental Sciences
Yongbiao Hua, Deepak Kukkar, Richard J. C. Brown, Ki-Hyun Kim
Summary: This article reviews the recent advances in hybrid MOF-MIP technology, discusses the performance of MIPs towards various targets, and explores the challenges and future prospects in MOF-MIP-based sensing applications.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Shikha Jain, Neeraj Dilbaghi, Nitin Kumar Singhal, Ajeet Kaushik, Ki-Hyun Kim, Sandeep Kumar
Summary: Accumulation of heavy metal ions in the ecosystem is a major concern for their negative effects on animals, humans, and aquatic habitats. A rapid and portable sensing system is crucial for detecting and managing such pollutants. A fluorescence-based biosensor has been developed for the selective and sensitive detection of Pb2+ ions using a DNAzyme system that responds only to the presence of lead (II) ions (Pb2+). This novel biosensing approach offers insights into the rapid and sensitive detection of major pollutants for food and environmental safety.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Shikha Bhogal, Irshad Mohiuddin, Ki-Hyun Kim, Ashok Kumar Malik, Kuldeep Kaur
Summary: A highly effective method using restricted access medium magnetic molecularly imprinted polymer (RAM-MMIP) for selective identification and isolation of phthalates (PTHs) has been established. The RAM-MMIP was synthesized using Fe3O4@SiO2 as support material, diethyl phthalate and dicyclohexyl phthalate as dual dummy templates, and (3-glycidyloxypropyl)trimethoxysilane as the silane coupling agent. The RAM-MMIP showed selectivity for PTHs and recyclability for multiple cycles, with successful application for extraction of PTHs from plastic packaged foods.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Dae-Hwan Lim, Younes Ahmadi, Young-Hyun Kim, Ki-Hyun Kim
Summary: Flavored capsule heat-not-burn (FC-HNB) tobacco products, including IQOS, Lil, and Glo, have been introduced as a new generation of cigarettes. These products release various volatile organic compounds (VOCs), and it is crucial to assess the potential harm associated with their use. The study evaluated the VOC composition in HNB cigarette vapor and found that breaking the capsules increased VOC concentrations significantly. Certain key VOC components, such as ethyl butyrate, isoamyl acetate, and limonene, were identified after breaking the flavored capsules. The research highlights the harmful effects of direct and indirect exposure to VOCs in FC-HNB products.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Bushra Fatima, Sharf Ilahi Siddiqui, Hament Kumar Rajor, Maqsood Ahmad Malik, Katabathini Narasimharao, Rabia Ahmad, Kumar Vikrant, Taejin Kim, Ki-Hyun Kim
Summary: In this study, a nano-photocatalyst consisting of zinc oxide coupled with cadmium tungstate was synthesized using lemon leaf extract. The photocatalytic activity of this nanocomposite was investigated for the degradation of Congo red dye under natural solar light irradiation. The results showed that the nano-photocatalyst exhibited excellent photocatalytic degradation performance, surpassing its pristine forms.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Manpreet Kaur, Mohamad Yusuf, Yiu Fai Tsang, Ki-Hyun Kim, Ashok Kumar Malik
Summary: CdMOF and ZnMOF-NH2, metal-organic frameworks functionalized with amine/hydrazone ligands, were synthesized using a conventional reflux method. These MOFs exhibited good crystallinity and thermal stability. They were found to be efficient in the fast sensing of 2,4,6-trinitrophenol (TNP) in water with high sensitivity and selectivity, with limits of detection of 7 ppb and 10 ppb, respectively. The sensing mechanism was assessed using density functional theory calculations and spectral overlap analysis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Chemistry, Applied
Vikas Chaudhary, Praveen Lakhera, Ki-Hyun Kim, Akash Deep, Parveen Kumar
Summary: The extensive use of lithium-ion batteries has led to a large amount of waste. These wastes can be a source of valuable metals such as lithium, cobalt, manganese, and nickel. Recycling these batteries can help reduce the cost of production and minimize environmental impacts.
SEPARATION AND PURIFICATION REVIEWS
(2023)
Article
Engineering, Chemical
Xinzhi Wang, Deepak Kukkar, Sherif A. Younis, Kumar Vikrant, Younes Ahmadi, Danil Boukhvalov, Ki-Hyun Kim
Summary: Adsorbents with high surface area and diverse functional groups can effectively remove volatile organic compounds (VOCs) with different polarities. A metal-organic framework-199 (MOF-199)/powdered activated carbon (PAC) composite (MOF-199@PAC) was prepared and used to treat multiple VOC system containing both non-polar (benzene) and polar VOCs (methyl ethyl ketone). The composite showed efficient adsorption of polar and non-polar VOCs on its surface due to the presence of abundant pi-pi conjugated sites and polar groups, respectively.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yang Sun, Vanish Kumar, Ki-Hyun Kim
Summary: Photocatalytic hydrogen evolution using graphitic carbon nitride (g-C3N4) is a feasible and environmentally friendly technology to address the energy crisis. This review discusses the advantageous photocatalytic properties of g-C3N4 for hydrogen generation and describes its mechanism and role in the photocatalytic process. The applicability of g-C3N4-based materials is further assessed based on figure of merit (FoM), and the most effective strategies identified include dye conjugation and metallic-co-catalyst doping of g-C3N4.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Chemistry, Analytical
Monika Chhillar, Deepak Kukkar, Preeti Kukkar, Ki-Hyun Kim
Summary: Immunoassays have become an important analytical tool for the early-stage diagnosis and treatment monitoring of common diseases like chronic kidney disease (CKD). This review discusses the merits and demerits of various biomarkers for CKD diagnosis and explores different immunoassay types for detecting these biomarkers. It provides valuable insights into the recent advances in nanomaterial-antibody conjugate-based immunoassays for CKD-associated metabolites and biomarkers.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Thi Yen Tran, Swati Verma, Sherif A. Younis, Ki-Hyun Kim
Summary: The potential application of ZnTON as an adsorbent for gaseous formaldehyde was investigated. ZnTON exhibited higher adsorption capacity than commercial P25-TiO2 and activated carbon. The adsorption capacity of ZnTON increased with higher initial feeding concentration of formaldehyde but decreased with rising temperature and moisture levels. The adsorption of formaldehyde onto ZnTON followed Langmuir isotherm and pseudo-second-order kinetic models. This study provides valuable insights for the synthesis of advanced adsorbents for the removal of volatile organic compounds.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Yang Sun, Sherif A. Younis, Ki-Hyun Kim, Vanish Kumar
Summary: This review discusses the fundamental aspects of bismuth oxyhalide (BiOX) photocatalysts in relation to their modification strategies and associated reduction mechanisms of CO2. The performance of BiOX materials is evaluated in terms of key performance metrics such as quantum efficiency, space-time yield, and figure of merit. The morphology design of BiOX materials is found to be the most efficient strategy for maximizing CO yield, while the introduction of heterojunctions is more suitable for CH4 formation. Therefore, the adoption of proper modification approaches is recommended for efficient CO2 conversion.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Prabhat Kumar Rai, Christian Sonne, Ki-Hyun Kim
Summary: The spread of heavy metal(loid)s at soil-food crop interfaces poses a threat to sustainable agricultural productivity, food security, and human health. The ecotoxic effects of heavy metals on food crops can disrupt seed germination, normal growth, photosynthesis, and cellular functions through reactive oxygen species.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Chemistry, Multidisciplinary
Yongbiao Hua, Younes Ahmadi, Ki-Hyun Kim
Summary: This comprehensive review summarizes the recent progress in transition metal oxide (TMO)-based thermocatalysts for the removal of formaldehyde (FA). The key factors affecting the catalytic activity of TMO-based thermocatalysts towards FA are discussed, including exposed crystal facets, alkali metal/nitrogen modification, type of precursors, and alkali/acid treatment. The performance of TMO-based composite catalysts is found to be superior to mono- and bi-metallic TMO catalysts, owing to their abundant surface oxygen vacancies and enhanced FA adsorptivity. The challenges and future prospects for TMO-based catalysts in the catalytic oxidation of FA are also discussed.
Article
Biotechnology & Applied Microbiology
Nikita Rajpal, Swati Verma, Navneet Kumar, Jechan Lee, Ki-Hyun Kim, Jatinder K. Ratan, Neetu Divya
Summary: The feasibility of a bioremediation approach using microbial formulations was studied to remove pesticides in greywater. The efficiency of the bioaugmented microbial consortium in degrading carbendazim and thiamethoxam was found to be 94.4% and 93.6%, respectively. This study contributes to the research on bioaugmentation for enhanced pesticide degradation.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)
