Abstract Aerodynamic and aeroacoustic performance of airfoils fitted with morphing trailing edges are investigated using a coupled structure/fluid/noise model. The control the flow over surface an airfoil shape optimization techniques can significantly improve load distribution along chord span lengths whilst minimising noise generation. In this study, NACA 63‐418 is flap various profiles considered two features that distinguish them from conventional flaps: they conformal do not rely on...

Structural Health Monitoring (SHM) systems have become a crucial tool for the operational management of long tunnels.For immersed tunnels exposed to both traffic loads and effects marine environment, efficiently identifying abnormal conditions from extensive unannotated SHM data presents significant challenge.This study proposed model-based approach anomaly detection conducted validation comparative analysis two distinct temporal predictive models using real tunnel.Firstly, dynamic method is...

This paper proposes a quantitative approach for selecting effective maintenance strategies metro tunnels in order to reduce cost and ensure tunnel safety the presence of structural degradation during service life. A non-stationary gamma process is used simulate gradual investigate effects different measures on life cycle soft soil. Two commonly applied reinforcement methods, Aramid Fibre Reinforced Polymer bonded steel plate reinforcement, are investigated this study. The feasibility...

Timely acquiring deformation of sectional profile is a proactive maintenance activity for ensuring the safety tunnels. Metro tunnels, especially constructed by shield tunnelling method, are long span infrastructures need to inspect their deformations at many different positions. This vast amount work if carried traditional approaches manually. Some advanced technologies, such as terrestrial laser scanning, also unable carry out quickly and economically. However, only severe that may lead...

The aerodynamic performance and wake development of a NACA 0012 airfoil fitted with morphing trailing edges were studied using experimental computational techniques. was tested having various camber profiles the same edge tip deflection. force measurements for carried out wide range chord-based Reynolds number angles attack deflection angle β = 5◦ 10◦. experiments validated steady-state RANS simulation SpalartAllmaras turbulence model. Experimental results show that significantly affect...

Tunnels generally operate underground or underwater in a complex environment. As result, the health monitoring system is inevitably affected by various environmental factors, which introduces noise to system. However, contained sequence may disrupt structural damage identification and state assessment as real response be overwhelmed noise. To properly eliminate an objective way, this study proposed improved wavelet threshold denoising method. Firstly, it adopts quantitative factor, namely...

Structural health monitoring (SHM) is gradually replacing traditional manual detection and becoming a focus of the research devoted to operation maintenance tunnel structures. However, in face massive SHM data, autonomous early warning method still required further reduce burden analysis. Thus, this study proposed dynamic for data based on ARIMA applied it concrete strain Hong Kong-Zhuhai-Macao Bridge (HZMB) immersed tunnel. First, wavelet threshold denoising was filter noise from data....

Metro systems in urban cities demand rapid inspection methods, order to identify critical structural defects a timely manner. However, traditional methods are only specific one kind of defect, which reduces the overall efficiency inspection. This study proposes an integrated solution for rapidly acquiring and identifying two kinds (surface cross-sectional deformation) metro tunnel, using cart equipped with non-metric cameras. The integrity rapidity considered formulating systematic design...

Abstract Cross‐section deformation is considered an important indicator for assessing the structural safety in inspection and maintenance of tunnels. The way it increases over its lifetime indication gradual degradation performance. In order to take timely appropriate measures before tunnel reaches ultimate limit state, a predictive model cross‐section should be established. this paper, probabilistic developed based on average uniform rigidity ring circular tunnels assembled from segmental...

A simplified layer-wise sandwich beam model to capture the effects of a combination geometric taper and variable stiffness core on static response is developed. In present model, face sheets are assumed behave as Euler beams modelled with first-order shear deformation theory. With geometrical compatibility enforced at both upper lower skin/core interfaces, beam’s field functions reduced only three, namely extensional, transverse rotational displacements mid-plane core. The minimum total...

Morphing structures that are both lightweight and conformal to the aerofoil currently being considered as promising candidates for next generation of aircraft high-lift systems. Utilizing spatially variable stiffness materials in morphing leads a possible reduction actuation energy requirement also enables geometric control over deformed shape structure, resulting enhanced aerodynamic aeroacoustic performance. In this study, design optimization methodology has been developed identify...