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Facing the energy crisis and the necessity to reduce CO2 and greenhouse gas emissions,
hydrogen has emerged as a key option in the decarbonization of fields such as aerospace and
automotive. Indeed, hydrogen constitutes a solution in the storage and transportation of
energy. Typically, hydrogen is stored in Composite Overwrapped Pressure Vessels (COPVs)
which have a better strength-to-weight ratio than traditional metallic pressure vessels. However, COPVs are still subject to improvement in the filament winding process which is greatly
responsible for the damage resistance and the fatigue behavior.
This Master thesis addresses the implementation of a model predicting the evolution of the
winding angle on the dome of cylindrical pressure vessels. The winding angle is an important
parameter in the determination of the mechanical behavior of composite pressure vessels. In
order to enlarge the possibility of winding trajectories, non-geodesic winding is implemented in
MATLAB. The solution of the non-geodesic equation is computed using the 4th-order Runge
Kutta method with a constant discretization over the dome profile. Then, the approach is
extended to a multi-layer structure predicting the winding angle on an arbitrary pseudo-ply
different from an ellipse.
Finally, a methodology to mesh a lay-up is implemented by defining the nodes, the elements,
and the winding angle associated with each element. The finite element model is then exported
in SAMCEF BACON for later simulations. This results in a more realistic dome modelling by
considering the different plies and the non-geodesic trajectories in the filament winding process.

Composite pressure vessel --- Non-geodesic --- Filament winding --- Winding angle --- Slippage coefficient --- Ingénierie, informatique & technologie > Ingénierie mécanique

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In this Special Issue on symmetry, we mainly discuss the application of symmetry in various structural health monitoring. For example, considering the health monitoring of a known structure, by obtaining the static or dynamic response of the structure, using different signal processing methods, including some advanced filtering methods, to remove the influence of environmental noise, and extract structural feature parameters to determine the safety of the structure. These damage diagnosis methods can also be effectively applied to various types of infrastructure and mechanical equipment. For this reason, the vibration control of various structures and the knowledge of random structure dynamics should be considered, which will promote the rapid development of the structural health monitoring. Among them, signal extraction and evaluation methods are also worthy of study. The improvement of signal acquisition instruments and acquisition methods improves the accuracy of data. A good evaluation method will help to correctly understand the performance with different types of infrastructure and mechanical equipment.

Technology: general issues --- History of engineering & technology --- real-time hybrid simulation --- H∞ control --- time delay --- mixed sensitivity --- structural health monitoring --- deep learning --- data anomaly detection --- convolutional neural network --- time–frequency extraction --- micro inertial measurement unit (MIMU) --- variational mode decomposition (VMD) --- Hilbert–Huang transform (HHT) --- frequency-domain integration approach (FDIA) --- torsion angle calculation --- offshore oil platform --- self-anchored suspension bridge --- cable clamp --- slippage --- force analysis --- high formwork --- ARMA --- BPNN --- stress trend prediction --- crack detection --- improved YOLOv4 --- concrete surface --- substructure shake table testing --- integration algorithm --- finite element method --- damper --- digital twin --- prestressed steel structure --- construction process --- safety assessment --- intelligent construction --- structural health monitoring (SHM) --- vibration --- frequency domain --- time domain --- time-frequency domain --- technical codes --- multiple square loops (MSL)-string --- seismic excitation --- dynamic response --- seismic pulse --- near and far field --- three-dimensional laser scanning --- surface flatness of initial support of tunnel --- curved surface fitting --- flatness calculation datum --- curvedcontinuous girder bridge --- collision response --- seismic mitigation --- pounding mitigation and unseating prevention --- heavy-duty vehicle --- road --- coupling model --- terrestrial laser scanning --- RGB --- genetic algorithm --- artificial neutral network --- real-time hybrid simulation --- H∞ control --- time delay --- mixed sensitivity --- structural health monitoring --- deep learning --- data anomaly detection --- convolutional neural network --- time–frequency extraction --- micro inertial measurement unit (MIMU) --- variational mode decomposition (VMD) --- Hilbert–Huang transform (HHT) --- frequency-domain integration approach (FDIA) --- torsion angle calculation --- offshore oil platform --- self-anchored suspension bridge --- cable clamp --- slippage --- force analysis --- high formwork --- ARMA --- BPNN --- stress trend prediction --- crack detection --- improved YOLOv4 --- concrete surface --- substructure shake table testing --- integration algorithm --- finite element method --- damper --- digital twin --- prestressed steel structure --- construction process --- safety assessment --- intelligent construction --- structural health monitoring (SHM) --- vibration --- frequency domain --- time domain --- time-frequency domain --- technical codes --- multiple square loops (MSL)-string --- seismic excitation --- dynamic response --- seismic pulse --- near and far field --- three-dimensional laser scanning --- surface flatness of initial support of tunnel --- curved surface fitting --- flatness calculation datum --- curvedcontinuous girder bridge --- collision response --- seismic mitigation --- pounding mitigation and unseating prevention --- heavy-duty vehicle --- road --- coupling model --- terrestrial laser scanning --- RGB --- genetic algorithm --- artificial neutral network

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• Reference Manager
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In this Special Issue on symmetry, we mainly discuss the application of symmetry in various structural health monitoring. For example, considering the health monitoring of a known structure, by obtaining the static or dynamic response of the structure, using different signal processing methods, including some advanced filtering methods, to remove the influence of environmental noise, and extract structural feature parameters to determine the safety of the structure. These damage diagnosis methods can also be effectively applied to various types of infrastructure and mechanical equipment. For this reason, the vibration control of various structures and the knowledge of random structure dynamics should be considered, which will promote the rapid development of the structural health monitoring. Among them, signal extraction and evaluation methods are also worthy of study. The improvement of signal acquisition instruments and acquisition methods improves the accuracy of data. A good evaluation method will help to correctly understand the performance with different types of infrastructure and mechanical equipment.

real-time hybrid simulation --- H∞ control --- time delay --- mixed sensitivity --- structural health monitoring --- deep learning --- data anomaly detection --- convolutional neural network --- time–frequency extraction --- micro inertial measurement unit (MIMU) --- variational mode decomposition (VMD) --- Hilbert–Huang transform (HHT) --- frequency-domain integration approach (FDIA) --- torsion angle calculation --- offshore oil platform --- self-anchored suspension bridge --- cable clamp --- slippage --- force analysis --- high formwork --- ARMA --- BPNN --- stress trend prediction --- crack detection --- improved YOLOv4 --- concrete surface --- substructure shake table testing --- integration algorithm --- finite element method --- damper --- digital twin --- prestressed steel structure --- construction process --- safety assessment --- intelligent construction --- structural health monitoring (SHM) --- vibration --- frequency domain --- time domain --- time-frequency domain --- technical codes --- multiple square loops (MSL)-string --- seismic excitation --- dynamic response --- seismic pulse --- near and far field --- three-dimensional laser scanning --- surface flatness of initial support of tunnel --- curved surface fitting --- flatness calculation datum --- curvedcontinuous girder bridge --- collision response --- seismic mitigation --- pounding mitigation and unseating prevention --- heavy-duty vehicle --- road --- coupling model --- terrestrial laser scanning --- RGB --- genetic algorithm --- artificial neutral network

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Geothermal energy is the thermal energy generated and stored in the Earth's core, mantle, and crust. Geothermal technologies are used to generate electricity and to heat and cool buildings. To develop accurate models for heat and mass transfer applications involving fluid flow in geothermal applications or reservoir engineering and petroleum industries, a basic knowledge of the rheological and transport properties of the materials involved (drilling fluid, rock properties, etc.)—especially in high-temperature and high-pressure environments—are needed. This Special Issue considers all aspects of fluid flow and heat transfer in geothermal applications, including the ground heat exchanger, conduction and convection in porous media. The emphasis here is on mathematical and computational aspects of fluid flow in conventional and unconventional reservoirs, geothermal engineering, fluid flow, and heat transfer in drilling engineering and enhanced oil recovery (hydraulic fracturing, CO2 injection, etc.) applications.

karst carbonate reservoir --- fracture compressibility --- enhanced gas recovery --- cost of electricity (COE) --- microstructure --- permeability --- CO2 permeability --- ammonia --- shale oil --- process simulation --- aquifer support --- spatiotemporal characteristics --- semi-analytical solution --- injection orientation --- CO2 diffusion --- wellbore temperature --- fluid front kinetics --- nest of tubes --- supercritical CO2 --- multiple parallel fractures --- multifractal theory --- real-scale --- techno-economic model --- fractal --- inter-well connectivity --- apparent permeability --- heat transfer --- porous media --- multiple structural units (MSU) --- coupled heat conduction and advection --- diffusion --- bottom-hole pressure --- tight reservoir --- ventilation --- surface diffusion --- unsteady process --- underground coal gasification (UCG) --- dynamic crack tip --- mercury intrusion porosimetry --- energy conservation analysis --- methanol --- comprehensive heat transfer model --- pressure fluctuations --- production optimization --- numerical simulation --- percolation model --- rheology --- drilling --- AE energy --- pipeline network --- natural gas --- huff-‘n-puff --- cement --- viscosity --- mathematical modeling --- enhanced geothermal systems --- cement slurries --- yield stress --- non-Newtonian fluids --- capacitance-resistance model --- thixotropy --- conductivity --- enhanced oil recovery --- leakage and overflow --- geothermal --- coal and rock fracture --- impact pressure --- computational fluid dynamics (CFD) --- GSHP (ground source heat pump) --- pore size distribution --- Knudsen diffusion --- hydraulic fracturing --- efficient simulation --- constitutive relations --- electricity generation --- fractal theory --- pore structure --- complex fracture network --- sloshing --- cost-effective --- slippage effect --- dynamic hydraulic-fracturing experiments --- critical porosity --- fracture uncertainty --- carbon capture and utilization (CCU) --- tube bundle model --- continuity/momentum and energy equations coupled --- main gas pipeline --- Coal excavation --- longitudinal dispersion coefficient --- computational fluid dynamic (CFD) --- flowback --- fracture simulation --- highly viscous fluids --- carbon capture and storage (CCS) --- energy dissipation --- economics --- particles model --- variable viscosity --- multi-pressure system --- frequency conversion technology (FCT) --- three-dimensional numerical simulation --- tight oil reservoirs --- multiphase flow --- methane removal --- Navier-Stokes equations