Dynamic Analysis - Science topic

Advances in the field of soil-structure interaction are impacting design, retrofitting and protection of civil engineering structures against natural hazards. CompDSSI is an in-person International Workshop devoted to new-generation numerical approaches for the dynamic analysis of soil-structure systems of strong practical relevance, investigating...

A novel framework for Bayesian structural model updating is presented in this study. The proposed method utilizes the surrogate unimodal encoders of a multimodal variational autoencoder (VAE). The method facilitates an approximation of the likelihood when dealing with a small number of observations. It is particularly suitable for high-dimensional...

Previous design methodologies for spring-driven jumping robots focused on jump height optimisation for specific tasks. In doing so, numerous designs have been proposed including using nonlinear spring-linkages to increase the elastic energy storage and jump height. However, these systems can never achieve their theoretical maximum jump height due t...

It is vital to effectively quantify the human movement parameters in rolling ships to save lives in maritime emergency and/or accidents. This study aims to develop a new two-layer social force model (2LR-SFM) to improve human evacuation efficiency in rolling ships. Firstly, the forces acting on humans are analysed in terms of physical forces, psych...

The Trough Girder with Corrugated Steel Webs (TGCWs) represents a novel form of through bridge that offers improved stress distribution characteristics and decreased inherent flaws when compared to the traditional trough girder design. Although the static behaviors of TGCWs have been reported before, the dynamic properties of this new structure hav...

The structural configuration of hill slope buildings differs from that of flat land buildings. During previous earthquakes, buildings located on a hill slope suffer severe damage/collapse even in moderate earthquakes. In comparison to flat land buildings, in both plan and elevation, these hillside structures are highly uneven. Under lateral loading...

Faults in rotating systems can cause significant damage to the machinery and can result in downtime and production losses. Hence, the timely detection and diagnosis of faults are very important for the smooth running of machines and the assurance of their safety and reliability. In view of this, a review of the literature has been presented in the...

The chain reaction of bridge abutment structure caused by frost heave of the embankment–bridge transition zone filler in cold regions has a great impact on the smoothness of railway lines, which will bring great challenges to the normal operation, safety, and maintenance of rail transit in cold regions under the action of long-term dynamic load. In...

Implicitly parallel task-based runtime systems often perform dynamic analysis to discover dependencies in and extract parallelism from sequential programs. Dependence analysis becomes expensive as task granularity drops below a threshold. Tracing techniques have been developed where programmers annotate repeated program fragments (traces) issued by...

Aiming at the dissemination of malicious information on online social networks, this paper proposes a new positive–negative information propagation model that incorporates the conformist psychological factors of communicators during the dissemination process. Firstly, the local and global stability of information-free equilibrium is analyzed and th...

Using a rate-equation model we numerically evaluate the carrier concentration and photon number in an integrated two-section semiconductor laser, and analyse its dynamics in three-dimensional phase space. The simulation comprises compact model descriptions extracted from a commercially-available generic InP technology platform, allowing us to model...

High-speed impact performance has significantly expanded over the past few decades. The target response based on the impact conditions has been more difficult to visualise and evaluate. In this article, Ansys model analysis has been used to measure, visualise, and predict the projectile and target responses of Kevlar® (K) and Ramie® textile-reinfor...

Nonlinear dynamic analyses of three-dimensional (3D) curved geometrically exact beams were carried out using a quadrature element (QEM) formulation. Three types of time integration algorithms were considered, namely, the energy and momentum conserving algorithm, and Newmark-Wilson algorithm using vector-like and ‘mixed’ parameterizations. Both the...

Inverse dynamics analysis is the primary means of quantifying joint moments and powers from biomechanical data. The data are often combined from force plates, motion capture cameras, and perhaps body-worn inertial sensors, and must be temporally synchronized to avoid potentially large inverse dynamics errors. The principles behind the errors, and t...

The demand for computational tools to simulate the nonlinear behavior of structures has intensified. Regarding nonlinear static or dynamic analysis, it is fundamental to use numerical strategies to trace the structure equilibrium paths, overcoming critical points (limit and bifurcations points). The nonlinear solvers must have a high level of effic...

Research on the characterization of ground motion intensity and damage of underground structures is limited, while reasonable selection of ground motion intensity measures and structural damage measures is a crucial prerequisite for structural seismic performance evaluation. In this study, a two-dimensional finite element model of soil and structur...

Throwable Unmanned Ground Vehicles are light weight, small size, easily deployable and impact resistive vehicles mainly used in domestic as well as in military purposes where human life is compromised such as inspection of sewage pipes, and search and rescue operations etc. Main challenge while considering a Throwable UGV is its impact absorption c...

Many existing buildings fail to meet the requirements of current earthquake resistance codes. Therefore, it is necessary to strengthen and/or upgrade such buildings. Strengthening and/or upgrading include adding new floors, parts, elements, etc. Modern codes usually do not reflect upgrading of existing buildings. These buildings may be damaged and...

This study focuses on modeling ideal nonuniform standing beams and towers supporting a constant top mass. We also analyze their dynamical stability, as determining the design parameters influencing their shape and stability holds significant value for structural engineering. Initially, we employ a statical mechanics approach to balance the mechanic...

Addressing the interconnectedness of oil prices and foreign exchange rates poses a substantial challenge and raises significant questions within economic research. Existing studies reveal a fragmented understanding of the dynamics between these crucial variables, highlighting a need for deeper investigation. This study extends previous research by...

Elevated liquid-containing tanks are vital constructions. They are regarded as one of the more vulnerable constructions to dynamic loads. Before performing the dynamic analysis, it is critical to compute the structure’s free vibration model analysis properties. So, the study conducts the free vibration model analysis of various elevated tanks. Prio...

International trading networks significantly influence global economic conditions and environmental outcomes. A notable imbalance between economic gains and emissions transfers persists, manifesting as carbon inequality. This study introduces a novel metric, the Ecological Economic Equality Index, integrated with complex network dynamics analysis,...

Broadly neutralizing antibodies have been proposed as templates for HIV-vaccine design, but it has been unclear how similar vaccine-elicited antibodies are to their naturally elicited templates. To provide insight, here we compare the recognition of naturally elicited and vaccine-elicited antibodies targeting the HIV-1-fusion peptide, which compris...

Railway vehicle dynamics involves modelling, simulating, and analysing the motion and interaction of rail vehicles under external force, exhibiting numerous nonlinear behaviours. Artificial intelligence (AI) is increasingly crucial in analysing and understanding these behaviours. This review presents a comprehensive survey of the latest research on...

This paper presents a new framework for corotational shell elements. The traditional corotational formulation uses local element frames, which greatly facilitates the calculation of elastic forces. However, all force vectors eventually need to be transformed into the global frame, resulting in the loss of invariance. The special Euclidean group SE(...

For a moving mass-beam system, the critical velocity of the moving mass is a key parameter that relates to the vibration stability of the system. In fact, the critical velocity obtained by the commonly used assumed mode method (AMM) differs from the actual situation. In this study, an analytical procedure is introduced to determine the critical vel...

Dear colleagues, With this letter, we would like to cordially invite you to submit your contribution to the Topical Collection entitled: “Nonlinear Dynamics of Small-Scale Robotics,” to be published in Nonlinear Dynamics: An International Journal of Nonlinear Dynamics and Chaos in Engineering Systems (Impact Factor: 5.6, SJR: Q1). This collection...

Supply chains comprise various interconnected components like suppliers, manufacturers, distributors, retailers, and customers, each with unique variables and interactions. Managing dynamic supply chains is highly challenging, particularly when considering various sources of risk factors. This paper extensively explores dynamical analysis and multi...

Ultra-high-speed permanent magnet motors (UHSPPMs) are gradually increasing in the number of scenarios to realize energy saving and emission reduction due to their advantages such as high power density and fast response speed, and their accurate design and analysis are becoming more and more important. UHSPMMs need to consider the effects of multip...

This paper presents an eight degree-of-freedom dynamic model of a spur gear system under varying crack depth scenarios for nonlinear analysis. Unlike previously reported reduced order models, which fail to capture realistic system behavior, such as chaos in healthy gears observed experimentally, this realistic model offers a more accurate represent...

The blast pressure acting on the borehole wall is the basis of the dynamic analysis of rock blasting. The history of blast-induced borehole wall pressure (BWP) is difficult to measure owing to the complex interaction between the blasting load and the borehole wall, and the limitations of the general test system. In this work, the complete history o...

The rise of malware targeting interconnected infrastructures has surged in recent years, driven largely by the widespread presence of vulnerable legacy IoT devices and inadequately secured networks. Despite the strong interest attackers have in targeting this infrastructure, a significant gap remains in understanding how the landscape has recently...

The current work provides the comparative study based on nonlinear dynamic responses and damping performance of the viscoelastic core-based sandwich (SW) plates subjected to blast load. The 0–3 viscoelastic composite (VEC), pure/conventional viscoelastic material (VEM), and viscoelastic particulate composite (VEPC) are taken individually as the vis...

We investigate Eigen's model for the evolution of the genetic code of microorganisms using a novel method based on population dynamics analysis. This model, for a given number of offspring, determines long-term survival as a function of the "genetic" information length and copy error probability. There exists a maximum threshold for the quantity of...

This paper proposes a fourth-order double-wing chaotic system with high complexity. After conducting a dynamic analysis, it is found that the system exhibits transient chaos and a rare inverse period-doubling bifurcation phenomenon in the bifurcation diagram. The system also exhibits attractor coexistence, with periodic, quasi-periodic, indicating...

A short cylindrical vehicle (the ratio of length to diameter is less than 2) equipped with an outer/inner detector is developed, which is inspired by the Tennis racket theorem and Olympic skeet shooting sports to achieve a regular scanning spiral on the ground. The sensitivity of the asymmetric mass distribution of the skeet-inspired vehicle (SIV)...

In this paper, a memristive circuit is designed based on a charge-controlled memristor, and the Hamilton energy function is obtained from the Helmholtz theorem. The system equation of memristive circuit is discretized by redefining the variables to obtain a three-dimensional memristive map and the corresponding energy function. Then, the effects of...

Ultrasound velocimetry has been widely used for blood flow imaging. However, the flow measurements are constrained to resolve the in‐plane 2D flow components when using a 1D transducer array. In this work, an ultrasound speckle decorrelation analysis‐based velocimetry (3C‐vUS) is proposed for 3D velocity components measurement using a 1D transducer...

During our digital transition, Docker containers have become essential for adaptable application deployment, although posing inherent security threats. This study utilizes Trivy for static analysis and Falco for dynamic analysis to identify and address vulnerabilities in Docker environments before deployment and in real-time. The IoT sector is now...

The memristor, a revolutionary electronic component, mimics both neural synapses and electromagnetic induction phenomena. Recent study challenges are the development of effective neural models and discovering their dynamics. In this study, we propose a novel Hopfield neural network model leveraging multistable memristors, showcasing its efficacy in...

Composite wall panel (CWP) design involves a multidisciplinary approach involving material science, structural engineering and dynamic analysis, using advanced modelling techniques and empirical methods. This paper presents an experimental investigation and numerical analysis carried out to understand the component behaviour of Steel-Concrete compo...

Rub-impact is one of the common failures in dual-rotor systems, and seriously affects the machine’s operation cost. Currently, research about this fault mainly focuses on models that gain initial excitation through rotor unbalance. Whereas, this excitation source is rarely aggravated during rotating machinery’s full life period. Aiming at this issu...

Seismic liquefaction of loose saturated cohesionless soils is one of the most dangerous and catastrophic phenomena that involves a temporary loss of soil shear strength and stiffness as a consequence of increase pore pressure and reduced effective stress. Therefore, the evaluation of the excess pore pressure induced by shaking is important to predi...

Increasing concern over the safety of consumable products, particularly aquatic products, due to freshness issues, has become a pressing issue. Therefore, ensuring the quality and safety of aquatic products is paramount. To address this, a dual-mode colorimetric–fluorescence sensor utilizing Ce-MOF as a mimic peroxidase to detect H2S was developed....

The recent advancements in generative adversarial networks have showcased their remarkable ability to create images that are indistinguishable from real ones. This has prompted both the academic and industrial communities to tackle the challenge of distinguishing fake images from genuine ones. We introduce a method to assess whether images generate...

To accurately investigate the nonlinear dynamic characteristics of a forward converter, a fractional-order state-space averaged model of a forward converter in continuous conduction mode (CCM) is established based on the fractional calculus theory. And nonlinear dynamical bifurcation maps which use PI controller parameters and a reference current a...

In the space microgravity environment, joint clearance is an important factor affecting the motion accuracy and stability of the mechanical system. This paper analyzes the dynamics of the four-bar mechanism with clearance in the microgravity environment. The two-state model is employed to describe the revolute joint with clearance. The continuous c...

Rapid urbanization has led to ecosystem fragmentation, conversion, and degradation, posing great threats to natural habitat and biodiversity. The utilization of ecological networks has gained importance in ecological restoration planning to mitigate the negative impacts of urbanization on ecosystems. This study focused on Nanchang City, China, as a...

Chaotic or hyperchaotic systems have a significant role in engineering applications such as cryptography and secure communication, serving as primary signal generators. To ensure stronger complexity, memristors with sufficient nonlinearity are commonly incorporated into the system, suffering a limitation on the physical implementation. In this pape...

Real‐world traffic flow is influenced by various random factors. Gaussian white noise is employed to describe the inherent randomness of traffic flow. A stochastic optimization velocity model is established for dynamic analysis. To enhance the traffic flow stability, the velocity difference of two successive vehicles ahead is considered. The veloci...

In this paper, a new logistic–sine coupled map lattices (LSSCML) is proposed, which has a large parameter space and all lattices are in stable chaotic state. The characteristics of LSSCML system better satisfy the cryptography compared with the traditional coupled map lattices (CML) model. Moreover, we propose a dynamic compressed sensing method, w...

Currently, earthquake-resistant design standards are based on the expectation that structures will undergo inelastic behavior during major seismic events, often resulting in ductile behavior with notable damage in steel and reinforced concrete buildings. Passive control systems are commonly employed to shield buildings from earthquake-induced damag...

The paper combines experimental and numerical simulation methods to investigate the tip leakage vortex (TLV) in an oil–gas multiphase pump. The study aims to understand the evolution and dynamic characteristics of the TLV. The vorticity decomposition theory is used to analyze the spatial–temporal evolution, transient behavior, and rigid vorticity o...

The fragility curve, which specifies the likelihood that a structure would sustain damage that exceeds a certain threshold for different levels of loading intensity, is a newly developed method for the seismic risk assessment of all at-risk projects. Median and log-standard distribution are the two parameters constituting the cumulative lognormal d...

Endothelial dysfunction is a key factor promoting atherosclerosis and cardiovascular complications. Hemodialysis patients typically show various cardiovascular complications and impaired retinal venular dilation has been described as a risk factor for mortality. Non-invasive retinal vessel analysis provides insight into the microvasculature and end...

As weeds cannot be eradicated in corn fields, a crab claw toe was used as the research object and combined with the agronomic requirements of corn fields to design a bionic weed claw suitable for corn fields. The contour curve of the crab claw toe was extracted and fitted through the Matlab image processing technology and fitting tool to establish...

This paper proposes a new four-dimensional chaotic system that consists of two active magnetically controlled memristors. The dynamic characteristics of the system, including equilibrium points, Lyapunov exponent spectrum, bifurcation diagram, double-parameter Lyapunov exponent, and attractor basin, are analyzed. The results indicate that the Lyapu...

Masonry-infilled reinforced concrete (MI-RC) buildings are one of the abundant building inventories and are commonly seen because of their relatively cheaper construction materials, and easier workmanship. However, often due to the negligence of the design guidelines or disregard of the contribution of masonry infills in structural weight and stiff...

It is essential and convenient to use accurate and validated numerical models to simulate the seismic performance of post-tensioned (PT) rocking bridge piers, with a particular emphasis on accurately capturing rocking behavior. The primary contribution of this study is a comparison of the effectiveness of four commonly used numerical base rocking m...

The offshore wind turbine structure is designed to have the first natural frequency between the rotor frequency (1P) and blade passing frequency (3P), a so-called soft-stiff design. Degradation of the pile-soil interaction stiffness can lead to a reduction of the first natural frequency, bringing it closer to the 1P and wave frequency. This leads t...

An earthquake is one of the most significant and shocking natural disasters ever documented anywhere on the planet. Throughout history, it has claimed millions of lives and wreaked devastation on infrastructure. Because earthquake forces are spontaneous and unpredictable, engineering methods must be honed to investigate buildings under the impact o...

In control systems where sensors and receivers of sensor recorded data are used, there is a possibility of time delay in transferring recorded data of structural motion, which is a factor to reduce the efficiency of control system and even destabilization of structure. In this paper, the effect of time delay on performance of semi-active seismic co...

In the context of planetary magnetospheres, the Alfvén radius plays a critical role as the demarcation line where the planet's magnetosphere and ionosphere effectively decouple. This boundary is pivotal in understanding the complex interactions between planetary magnetic fields and space plasma environments. This study presents a dynamic analysis o...

This study employed meta-heuristic clustering algorithms to determine the source and mechanism of groundwater salinization in Quebec’s Saguenay-Lac-Saint-Jean (SLSJ) region, utilizing hydrogeochemical (38 inorganic constituents, including minor, major, and trace elements) and isotopic data (δ¹⁸O and δ²H). A total of 382 groundwater and precipitatio...

The building sector, which is responsible for a significant amount of total global energy consumption, provides substantial opportunities for energy efficiency studies. In the context of historic and traditional buildings, this matter becomes more crucial, as energy efficiency is more complex and challenging. The complexity partly derives from the...

In the development of lunar and planetary exploration rovers, risk assessment in on-site environments comprising fine regoliths and unevenly distributed rocks is essential. To prevent a rover from being stuck during its operation, one must understand the behavior of its wheel when it climbs over rigid obstacles in off-road environments. In this stu...

A comprehensive two-dimensional (2D) time-domain numerical model is established to investigate the interaction of irregular waves and submerged structures with different sections. The model specifically focuses on the dual-lane submerged floating tunnel (SFT) designs, encompassing elliptical, twin-circular, and round rectangular sections. For the h...

Abstract: Ransomware poses a significant threat to modern computer systems, making the development of effective detection mechanisms crucial. This project leverages a blend of statistical and dynamic analysis to uncover essential characteristics that differentiate ransomware from benign files. Feature extraction is followed by rigorous feature rank...

The Asian citrus psyllid (ACP) Diaphorina citri Kuwayama is the leading vector of Candidatus Liberibacter asiaticus (CLas), the causative agent of citrus Huanglongbing (HLB) disease. The distribution and dynamics of CLas within ACP are critical to understanding how the transmission, spread and infection of CLas occurs within its host vector in natu...

Structures in earthquake-prone areas may suffer from accumulative damages caused by sequential shocks, including the mainshock and aftershock of an earthquake or several strong motions throughout their service lifespan. Sequential shocks lead to a decrease in the capacity of structures. Nevertheless, seismic fragility curves and their applications...

Continuous beam bridges of monopile foundation are commonly used due to its good stress performance, stiffness and beautiful shape. However, scouring will weaken the lateral restraint of soil on pile foundation. It affects the dynamics of the bridge structure and make pile foundation vulnerable to earthquakes. Therefore, it is required to analyze i...

This article explores the nonlinear dynamical analysis and control of a 2À DOF system that emulates the lateral vibration of an asymmetric rotor model under external, multi-parametric, and mixed excitation. The linear integral resonant controller (LIRC) has been coupled to the rotor as an active damper through a magnetic actuator. The complete math...

In this paper, a group of correlative and switchable dual memristor hyperchaotic systems consisting of three subsystems is constructed. The common part of the systems is composed of charge-controlled memristor, capacitor and inductor. The switchable parts of the systems are composed of three different flux-controlled memristors. By switching the se...

Testing is an essential part of modern software engineering to build reliable programs. As testing the software is important but expensive, automatic test case generation methods have become popular in software development. Unlike traditional search-based coverage-guided test generation like fuzzing, neural test generation backed by large language...

(1) Background:The objective of this study was to explorethe dynamic changes of gut microbiota in Simmental calves before weaning, and compared microbial composition and functionality differences between diarrhea and health calves; (2) Methods: Fourteen neonatal Simmental calves were divided into a health group (n = 8) and diarrhea group (n = 6). T...

The investigation into advanced structural materials, such as composite materials, has revealed numerous possibilities within the field of bridge engineering. Glass-fiber-reinforced polymers (GFRPs) are notable among these materials, particularly in footbridge construction, encompassing both arch and cable-stayed designs. While GFRPs boast advantag...

The increasing use of electromedical equipment in hospital care services necessitates effective management of complex devices often unsupported by existing control systems. This paper focuses on developing a pool of evaluation indices for the Clinical Engineering Department (CED) of the ASST Grande Ospedale Metropolitano Niguarda in Milano (Italy),...

Magnetorheological elastomers are active materials which can be actuated by the applied magnetic field. Hard magnetic soft (HMS) materials, a type of magnetorheological elastomers, show great potential in the fields of biomedical engineering and soft robotics, due to their short response time, remote operation, and shape programmability. To exploit...

1 Summary A variable density, stress constrained topology optimization based on SIMP and a p-norm aggregated global element stress measure is used herein. The aim of optimization is to achieve maximum material savings by utilizing the structure at its load limit. The challenges are manifold. The number of active stress constraints increases with un...

A wide range of statistical and econometric models have been applied in the extant literature to compute and assess the volatility spillovers among renewable stock prices. This research adds to the body of knowledge by analyzing the dynamic asymmetric volatility spillover between major NASDAQ OMX Green Economy Indices, including solar, wind, geothe...

Existing research on the design of flexible barriers to arrest the landslide mass mainly focuses on the optimization of the superstructure. Little attention has been given to the optimization of the foundation anchors used to transmit dynamic impact loading from the landslides to the ground. In fact, existing design guidelines for foundation anchor...

Europe has experienced the adverse effects of climate change due to the human footprint on a scale never seen before. The region's future appears challenging as it persistently adheres to conventional practices. To address this, social movements in Europe must advocate for policymakers to earnestly undertake the widely advocated energy transition w...