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With continuous improvements in the social economy and living standards of individuals, the vibration comfort of building structures has gradually been emphasized by academic and engineering communities, such as vehicle-induced vibrations in buildings near traffic, human-induced vibrations in large-span structures, wind-induced vibrations in super-...
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... primary objective in developing vehicle load models and dynamic analyses was to determine passenger comfort or the safety and durability of train running, railways, or bridges. Table 1 lists the typical train load models in recent years. Therefore, their vehicle load models are sufficiently detailed, with the latest model having 42 DOFs [23]. ...Similar publications
A free‐standing, flexible polysaccharide‐based natural solid polymer electrolyte composed of i‐Carrageenan doped with various concentrations of ammonium triflate is created via the solution casting approach. An investigation was conducted into the effects of ionic dopant on the structural, vibrational, thermal, dielectric, transport, and electroche...
Aimed at addressing the strong nonlinearity and strong external disturbances that cause flight control issues in conventional guided projectiles, as well as the slow response and structural vibrations that often occur in sliding mode control systems, which have a detrimental impact on the control effect and ultimate hit precision, a new type of fas...
Molecular structures of 5-chloro-7-azaindole-3-carbaldehyde (5Cl7AICA) and 4-chloro-7-azaindole-3-carbaldehyde (4Cl7AICA) were investigated using infrared and Raman spectroscopy supported by density functional theory (DFT) calculations. Theoretical studies were carried out with three DFT methods, which include dispersion corrections: B3LYP-D3, PBE0...
Two-dimensional (2D) materials featuring anisotropic structural, vibrational, and thermal properties offer new and exciting opportunities to enable efficient energy conversion and thermal management. Beyond the most apparent anisotropy in 2D materials, due to distinct in-plane and out-of-plane (intralayer and interlayer) thermal transport, certain...
In this study, we have synthesized a novel organic–inorganic hybrid crystal 4-nitrobenzyl-4-aminopyridinium tetrachlorocuprate(II) [4NO2Bz-4NH2Py]2[CuCl4](1). The single-crystal X-ray diffraction analysis revealed that the crystal belongs to the triclinic space group P–1, and consists of four [4NO2Bz-4NH2Py]⁺ cations and two [CuCl4]²⁻ anions. O⋯π,...
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... A particularly critical area for further inquiry is the long-term performance and deterioration of damping devices when subjected to diverse environmental conditions. Xie and Hua [149] assert that, while existing design approaches partially address these interactions, there is a pressing need for more advanced models capable of accurately forecasting the coupled behavior of dampers and structural components during intense seismic activity. This gap in understanding is particularly critical when considering the likelihood of nonlinear responses and damage accumulation in both the dampers and the primary structure. ...
This review article presents a detailed investigation into the seismic behavior of structures employing supplementary dampers or additional damping mechanisms over the past decade. The study covers a range of damping systems, including viscous, viscoelastic, and friction dampers, as well as tuned mass dampers and other approaches. A systematic analysis of more than 160 publications in the current literature is undertaken, providing a clear overview of structures equipped with supplementary damping devices and the challenges they face. The theoretical principles that underpin these technologies are examined, along with their practical applications and effectiveness in alleviating seismic effects. Additionally, the article highlights recent developments in the design of damping devices, the challenges related to their implementation, and prospective directions for future research. By synthesizing results from experimental studies, numerical simulations, and real-world applications, this review offers valuable insights for researchers and engineers involved in the design of earthquake-resistant structures.
... These complex models are characterised by many body parts, modelled as rigid links between 3D joints, as well as many other biomechanical parameters calibrated from experimental observations. However, future research should focus on more nuanced models that consider individual variations in gait and movement patterns, to develop frameworks that can predict individual and population-level responses to vibration exposure [89]. ...
This review paper investigates the current state of research on structure-to-human interaction (S2HI) in the monitoring and control of cyclo-pedestrian footbridges, focusing specifically on the biodynamic effects of oscillations on pedestrians. Its aim is, therefore, twofold: In the first half, it examines the limited but evolving understanding of human gait responses to vertical and horizontal vibrations at frequencies and amplitudes characteristic of footbridge dynamics. The second half includes a detailed analysis of various modelling strategies for simulating pedestrian and crowd dynamics, emphasising the movements and stationary behaviours induced by structural vibrations. The aim is to highlight the strengths and limitations of these modelling approaches, particularly their capability to incorporate biomechanical factors in pedestrian responses. The research findings indicate that existing studies predominantly focus on human-to-structure interaction (HSI), often neglecting the reciprocal effects of S2HI, with many results in the literature failing to adequately address the biomechanics of single pedestrians or crowds experiencing structural vibrations on cyclo-pedestrian bridges. This gap underscores the need for more precise and comprehensive studies in the field to improve the understanding of dynamic interactions between single or multiple walking individuals and footbridge vibrations, especially for vulnerable and elderly people with limited mobility. Furthermore, considerations regarding the impact of Structural Control and Health Monitoring to alleviate these issues are briefly discussed, highlighting the potential to optimise footbridge performance in terms of pedestrian comfort.
To enhance the vibration isolation functionality of the seat suspension system, particularly in the context of magnetorheological (MR) seat dampers, a pioneering semi-active controller integrating an adaptive neuro-fuzzy inference system (ANFIS) and active disturbance rejection control (ADRC) was devised. Firstly, the Bouc–Wen model was employed to establish the dynamic model of the damper based on experimental data, thereby ensuring an accurate description of the actual physical behaviours. Subsequently, the ANFIS technology was employed to develop an inverse model, which detailed the structural design and training process of the inverse model. This resulted in the achievement of precise prediction and control of the damper behaviour. Ultimately, the ANFIS inverse model was integrated with the designed ADRC controller to create an innovative control scheme for the seat suspension system of a two-degrees-of-freedom dynamic model, and a simulation analysis was conducted. The simulation results demonstrate that the root-mean-square (rms) value of the vertical vibration acceleration of the ADRC-controlled suspension system decreased by 68.9 % and 34.4 % in comparison to proportional–integral–derivative (PID) control and passive control, respectively. The rms value of the dynamic disturbance of the ADRC-controlled suspension system decreased by 50.0 % and 28.6 % compared to PID control and passive control, respectively. This verifies the performance of the proposed controller, particularly in the precise control of damping force, demonstrating outstanding effectiveness.
