bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of orientation angle of spectrum-compatible bidirectional ground motions on nonlinear seismic response of bridge piers considering progressive damage process
Authors: Zhou Jian , Igarashi Akira 
Published: June 2024

Abstract
The Orientation Angle (OA) of bi-directional ground motions affects the nonlinear response of structures. In this study, a suite of RotD100 spectrum-compatible bi-directional ground motions is generated, such that OA remains constant regardless of the natural period and is compared with another suite with non-constant OA. Idealized single-column steel bridge piers involving a progressive damage process are utilized to investigate the effect of OA on nonlinear seismic response. Incremental Dynamic Analysis (IDA) is conducted with the two suites of bi-directional ground motions applied to the piers through 360° at an angle increment of 9°. It is shown that the difference in seismic demanding between the two suites of bidirectional ground motions becomes significant as Peak Ground Acceleration (PGA) increases. The seismic demand of bi-directional ground motions with constant OA is severer when the piers are subjected to strong earthquakes (i.e., PGA is high). This sheds light on the importance of a reasonable suite of bi-directional ground motions in designing new bridges or retrofitting old bridges.
Immersed-Boundary Fluid-Structure Interaction of Membranes and Shells
Authors: Lauber Marin , Weymouth Gabriel D. , Limbert Georges 
Published: June 2024

Abstract
This paper presents a general and robust method for the fluid-structure interaction of membranes and shells undergoing large displacement and large added-mass effects by coupling an immersed-boundary method with a shell finite-element model. The immersed boundary method can accurately simulate the fluid velocity and pressure induced by dynamic bodies undergoing large displacements using a computationally efficient pressure projection finite volume solver. The structural solver can be applied to bending and membrane-related problems, making our partitioned solver very general. We use a strongly-coupled algorithm that avoids the expensive computation of the inverse Jacobian within the root-finding iterations by constructing it from input-output pairs of the coupling variables from the previous time steps. Using two examples with large deformations and added mass contributions, we demonstrate that the resulting quasi-Newton scheme is stable, accurate, and computationally efficient.
A Novel Stochastic Methodology for the Generation of Artificial Seismic Accelerograms
Authors: Yanni H. , Fragiadakis M. , Mitseas I. P. 
Published: June 2024

Abstract
Time-history analysis requires the use of suites of accelerograms that represent the input ground motion. A simple and computationally efficient stochastic methodology for the generation of suites of fully non-stationary artificial accelerograms is presented. The proposed methodology ensures that the record suites have a given target spectral mean and variability for the whole period range of interest. The model first produces an ensemble of target spectra with a given mean and variability and then a methodology based on spectral representation techniques is used to obtain the corresponding acceleration time-histories. The proposed approach also ensures that the produced ground motions are fully non-stationary and have different duration. The outcome is a suite of ground motion time-histories whose spectral mean and variability match those obtained from a ground motion model (GMM).
The effect of dynamic soil-structure interaction on the response of periodic box girder bridges
Authors: Reumers Pieter , Lombaert Geert , Degrande Geert 
Published: June 2024

Abstract
This paper investigates the effect of dynamic soil-structure interaction (SSI) on the response of long, multi-span box girder bridges during the passage of high-speed trains. A periodic finite element-boundary element (FE-BE) model is used to compute the bridge receptance. The influence of foundation-soil-foundation interaction on the bridge response is studied.
Resonant Metamaterials for high-frequency vibration mitigation in Nuclear Power Plants
Authors: Kanellopoulos C , Jeremic B , Anastasopoulos I , Stojadinovic B 
Published: June 2024

Abstract
The paper explores the potential effectiveness of horizontally vibrating resonant metamaterials to mitigate high-frequency vibrations of critical equipment/components caused by vertically propagating horizontal shear waves. These components are housed in stiff and strong structures of high importance, such as the reactor vessel inside the reactor building of Nuclear Power Plants (NPPs). High-fidelity 3D Finite Element (FE) models of the reactor building with the resonant metamaterials embedded into the soil on the sides of the NPP reactor building in a strip-like configuration (1 x 6 x 22) are developed in the Real-ESSI Simulator. After describing the FE model, its individual components are verified. The preliminary analysis shows that properly tuned resonant metamaterials (i.e., resonant frequency at 19-20 Hz) with a total vibrating mass of only 4.3% of the NPP reactor building mass, can lead to 20% reduction of the in-structure response spectrum at the centre of the foundation, where the reactor vessel is located, at the critical vibration frequency of the reactor vessel of 20 Hz. The amplification effect of the metamaterials at lower frequencies, stemming from their in-phase vibration with the soil, could be avoided if they are designed as semi-active or active systems that vibrate exclusively at the desired frequency. Finally, it is shown that the effect of metamaterials in this high frequency range is very localized, vanishing rapidly within a distance of one unit cell, indicating that their geometric configuration could be optimized to increase their efficiency.
Seismic soil-structure interaction study of inclusion reinforced foundations with a macro-element
Authors: Shen Yuxiang , Pérez-Herreros Jesús , Cuira Fahd , Semblat Jean-François , Burlon Sébastien 
Published: June 2024

Abstract
The reinforcement technique using rigid inclusions is a practical, cost-effective, and time-saving foundation solution. This technique has already proven successful in supporting structures that are subject to high seismic demands, such as the Rio-Antirrio bridge in Greece. In a performance-based design approach, it is important to consider the dynamic soil-structure interaction phenomenon, which is specially relevant when dealing with soft soils. Direct approaches simulating the whole soil-structure system within the same numerical model are still computationally expensive and the classic modal response spectrum analyses, based on the superposition principle, are not capable of taking into account most of nonlinear mechanisms. The macro-element approach is therefore a promising method, as it allows modelling of non-linear soil-structure interaction mechanisms at the base of the structure without increasing the numerical cost. This approach has shown particularly good performance in the dynamic analysis of shallow and piled foundations. The present paper aims to extend the application of the macro-element approach to foundations on rigid inclusions. To this end, the upper-bound kinematic exterior approach is employed to derive a yield surface corresponding to this type of foundation. Its potential application in the context of non-linear soil-structure interaction studies is also discussed.
Nonlinear dynamics of elastically connected multistable structures
Authors: de Castro C H L , Orlando D , Gonçalves P B 
Published: June 2024

Abstract
Recent decades have witnessed a new interest in the field of structural stability due to the use of multistable systems in several applications including vibration control, energy harvesting, deployable and collapsible structures, micro- and nanocomponents and the development of metamaterials. In many cases, multistable behavior is attained by coupling bistable elements. A basic example of bistable structure is the von Mises truss, which presents two stable equilibrium configurations. In this work, the multistable behavior of a sequence of von Mises trusses connected through flexible elements is studied. This system has several stable and unstable equilibrium configurations resulting from the geometric nonlinearity, which significantly influences its nonlinear oscillations and dynamic stability. To obtain the equilibrium paths, the nondimensional non-linear equilibrium equations are derived and solved by continuation techniques. Hamilton’s principle is then employed to obtain the nonlinear equations of motion around an equilibrium configuration. They are numerically integrated to obtain bifurcation diagrams and basins of attraction, which clarify the effect of load and system parameters on the nonlinear oscillations and instabilities of the coupled trusses, in particular the geometric nonlinearity and connection stiffness. This may help in the development of new engineering applications where multistability is desired.
Application of TRIZ for gantry crane improvement
Authors: Shu Luing Nikalus Swee , Toh Guat Guan , Chau Guan Hin 
Published: June 2024

Abstract
TRIZ methodologies, including tools like engineering system analysis, function analysis, cause and effect chain analysis, physical contradiction identification, separation strategies, and contradiction matrix, are utilized to discover effective and sophisticated solutions for addressing various challenges. By employing a sequence of TRIZ tools, issues related to a gantry crane are resolved, showcasing the effectiveness of TRIZ as an innovative problem-solving approach.
Analysis of influence of blade number on aerodynamic performance and noise of forward centrifugal fan
Authors: Yin Mingning , Ge Rongyu , Li Jiaqi 
Published: June 2024

Abstract
In this paper, the influence of the number of blades on the flow characteristics and aeroacoustics performance of a forward impeller centrifugal fan used in a milling recovery vehicle is studied by numerical simulation. The results show that the total pressure of the forward centrifugal fan increases with the increase of the number of blades. When the number of blades is 18, the vortex loss caused by boundary layer separation in the impeller is relatively low. Under the design flow and small flow conditions, the total pressure efficiency of the fan first increases and then decreases with the increase of the number of blades. The noise analysis shows that the cochlear tongue and the surface of impeller runner near the volute outlet are the main sources of fan noise. The far field noise characteristics of the fan with 16 blades are better than those of the prototype fan. The discrete noise at the fundamental frequency of monitoring point B and monitoring point D is 6.25dB and 1.2dB lower than that of the original fan, respectively. The research results have a good guiding significance for the design and optimization of forward centrifugal fan.
Throughflow inverse design of a transonic fan stage based on CFD method
Authors: Li Jinguang , Wu Hu 
Published: June 2024

Abstract
In this paper, a throughflow method based on Computational Fluid Dynamics (CFD), which has emerged as a focal point in the field of turbomachinery design, is developed to be universally applied across the entire speed range. For the inverse problem, the distribution of circulation is specified along streamlines. To simulate the viscous dissipation effects, isentropic efficiency is manually input into the program. The results of a subsonic ideal rotor demonstrate the correctness of the inviscid module. To showcase the design capability to design transonic axial-flow turbomachinery, a fan stage featuring a total pressure ratio of 1.59 and a tip relative Mach number of 1.35 is designed. The results indicate that the performance parameters exhibit an error of less than 0.1%, effectively providing information regarding the airflow angle along the spanwise direction of blade rows.
Structural, Morphological, and Optical Properties of as Deposited and Annealed SnO2 thin film using Thermal Evaporation Technique
Authors: Kakade S. B. , Thorat S. M. , Holkar R. R. , Supekar S. H. , Kale R. D. , Kalange A. E. 
Published: June 2024

Abstract
The morphological modification of thin film structures has been a focus of metal oxide semiconductor-based sensor research in recent years. Tin oxide is well known for being one of the most essential and researched materials for manufacturing semiconductor gas sensors. In the present work, thermal evaporation technique is used to deposit pure semiconductor tin oxide (SnO2) films on a glass substrate. The as-deposited thin films of SnO2 were annealed for 60 min, 120 min, and 180 min at 450 °C. The structural, morphological, and optical properties of material were investigated by using XRD, FESEM, and UV-Visible techniques as a function of annealing temperature.
Enhancement of radiation shielding properties in BaTiO3 added with Bi2O3 at the energy range of 356keV -1333keV
Authors: Nodagala Ramakumar , Ponnada Tejeswara Rao 
Published: June 2024

Abstract
The investigation on the radiation shielding properties of BaTiO3-xBi2O3 with (x=0, 2, 4, 6, 8 %) ceramic samples has been discussed in this paper. This study targeted especially on the radiation shielding properties such as tenth value layer (TVL) and effective electron density (Neff) by including density of sample as one of the parameters. The prepared ceramic samples radiation shielding properties were quantified with help of radioactive sources Ba133, Na22, Cs137, and Co60 at the energies 356keV, 511keV, 1173keV, 1275keV and 1333keV. The obtained experimental values compared with theoretical values by using Phy-X/PSD software. Obtained results revealed that, attenuation abilities improved due to addition of Bi2O3 at different concentration to BaTiO3 causes the rise in density of ceramic samples from 5.483 to 5.498g/cm3. S1 sample has maximum TVL value found at 10.098cm and sample S4 noticed with lowest value 9.842cm at 1333keV. The maximum Neff value recorded as 2.72 at 1333keV for sample S4 which indicating promising radiation shielding abilities.
Investigating Ion Conduction Mechanism and Dielectric Characteristics of Sodium-Based PEO + PVDF-HFP Solid Polymer Electrolyte Membranes
Authors: Ravi Varma I S , Kumar Ganta Kiran , Ramana Jeedi Venkata , Ramesh S. 
Published: June 2024

Abstract
This paper focuses on the preparation, characterization and dielectric studies of the flexible and free-standing solid polymer electrolyte membranes based on PEO + PVDF-HFP complexed with NaPF6 by the solution casting technique. The X-ray diffraction, Differential scanning calorimetry techniques were employed to analyse the structural properties and melting temperatures of the prepared solid polymer electrolyte membranes. In this study, we have explored the impact of polymer blending. The weight percentages of PEO and PVDF-HFP were systematically varied, while keeping the NaPF6 weight percentage constant. The impedance spectra of the prepared solid polymer electrolyte membranes are recorded using the N4L-PSM1735 Impedance Analysis Interface across a frequency range spanning from 1 Hz to 30 MHz. The obtained impedance spectroscopy data facilitated the determination of bulk resistance (R

b
) and enabled an in-depth exploration of the dielectric and electrical modulus characteristics of the prepared solid polymer electrolyte membranes. Ionic conductivity values are derived through the analysis of bulk resistance (R

b
) measurements. The most notable ionic conductivity value of 5.418x10−7 S/cm at room temperature was achieved with the solid polymer electrolyte membrane 70wt%PEO+30wt%PVDF-HFP+3wt%NaPF6. In this study, the solid polymer electrolyte membrane comprising 70wt%PEO, 30wt%PVDF-HFP, and 3wt%NaPF6 emerged as the optimum conducting composition.
Pilot fatigue evaluation with the method of weight TOPSIS
Authors: Yang Qingxuan , Li Zhi , Tong Lizhong 
Published: June 2024

Abstract
Fatigue is significant to many aviation accidents, so assessing pilot fatigue is critical to aviation safety. Traditional fatigue risk assessment studies often ignore the impact of difficult flight maneuvers on pilot fatigue. The study sought to develop a fatigue risk indicator system that could be integrated with airline data systems to achieve a more accurate assessment of pilot fatigue. The questionnaire content was determined by literature collection and methods, and 128 civil aviation pilots were surveyed by questionnaire. The influence of pilot scheduling, workload, working environment and other specific indicators on pilot fatigue was evaluated by Weight TOPSIS analysis method. Then the model is used to evaluate pilot fatigue for practical scheduling problems. The study found that lack of rest time, long working hours and red-eye flights were the most common causes of pilot fatigue. In practice, the fatigue evaluation system can be combined with the database information of the airline to help the airline rationally arrange the flight, minimize the fatigue index and ensure the safety.
Study on the layout of light rapid transit station connecting bus line based on GIS network analysis -- Taking Glasgow City as an example
Authors: Fan Xinyi , Liu Chang , Li Yinghua , Ding Ran 
Published: June 2024

Abstract
As the main body of the city’s public passenger transportation system, light rail and conventional buses are effective supplements to improve the passenger transportation network of the rail transit system. Therefore, the coordinated development of rail transit and conventional bus systems has a great effect on expanding the scope of rail passenger flow attraction. Through the network analysis tool of GIS, the service scope of public transport in Glasgow City is calculated, and through the analysis of population density, the areas where the light rapid transit station service is not available and the bus transport needs to be connected to provide service are identified. Then the location and configuration model is used to choose out three key bus stations and two key LRT stations to create connection lines. Finally, this paper studies the shared bicycle delivery point, and the points are set in the area with high population density, so as to solve the problem of “the last kilometer” of residents’ travel. Through the above research on the layout of public transport, it can provide a reference for the development of public transport in Glasgow.
Fusionformer: Exploiting the joint motion synergy with fusion network based on transformer for 3D human pose estimation
Authors: Yu Xinwei 
Published: June 2024

Abstract
This paper proposes a 2D-3D supervised Fusionformer method for current 3D human pose estimation. It introduces self-trajectory module and cross-trajectory module to capture the motion differences and synergy of different joints. In addition, the created Global Local Fusion Block (GLF) combines global spatio-temporal pose features and local joint trajectory features in parallel. Furthermore, to eliminate the impact of poor 2D poses on 3D projection, a pose refinement network is introduced to balance the consistency of the 3D projection. Finally, the proposed method is evaluated on two benchmark datasets: Human3.6M and MPI-INF-3DHP. Compared to Poseformer and MGCN baseline methods, the results show an improvement of 3.0% MPJPE and 2.0% MPJPE on the Human3.6M dataset. By fully exploiting the characteristics of local joint synergy and adaptively fusing them with global pose features, our method demonstrates superior performance in 3D human pose estimation.
Recent advances in smart grid architecture and grid-electric vehicle-charging station interaction
Authors: Zhang Dongning 
Published: June 2024

Abstract
New energy sources, including renewable energy sources such as solar, wind, hydropower, and power storage technologies, are environmentally friendly, renewable, and long-lasting, reducing dependence on finite fossil energy sources and helping to mitigate climate change and reduce environmental pollution. This paper focuses on the interaction between smart grids and electric vehicle (EV) charging. The proliferation of electric vehicles contributes to better utilisation of renewable energy, reduces dependence on fossil fuels, reduces environmental pollution, improves air quality, and promotes sustainable development. Smart grids offer more possibilities and conveniences for electric vehicle charging, enabling more efficient, reliable, and sustainable distribution and management of electricity through the application of critical technological components such as smart metering, distributed energy integration and management technologies, demand response technologies, peak and valley tariff strategies, and intelligent charging station scheduling technologies. This paper further delves into the academic and practical applications of innovative grid-related technologies. It presents a case study of electric cab charging guidance strategies, demonstrating the synergy between electric vehicle charging and the power grid and road network. By optimising charging paths and improving charging efficiency, energy waste is minimised, and the market penetration of EVs is promoted. Continuous exploration and innovation in this field will provide crucial strategic support for using clean energy, reducing environmental pollution, and improving energy efficiency, contributing to constructing a sustainable future mode of transportation.
Wearable strain sensor for motion capture
Authors: Mo Zhenhua 
Published: June 2024

Abstract
Strain sensor is a type of sensor that is used to measure the strain or deformation applied to an object. These sensors are widely used in engineering, scientific and industrial applications to monitor and record the deformation of an object to provide information about the forces applied. Motion Capture is a technology used to capture and record human movements, postures and actions and convert them into digital data. This technology plays a key role in industries such as gaming, movies and robotics. In recent years with the growth of these industries, there has been an increasing demand for lightweight and accurate motion capture devices, which have made wearable strain sensors for motion, capture a popular research area. This review explores wearable strain sensors for motion capture by delving into their classification and the underlying working principles. Furthermore, it will offer comprehensive insights into the primary sensing materials employed in motion capture strain sensors, coupled with a thorough analysis of the structural design aspects. Finally, a reasonable conclusion is achieved: While this type of sensors has gained significant momentum in recent years, several critical shortcomings prevent their practical application and commercialization, which are expected to be overcome soon.