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Smart Sensors for Structural Health Monitoring

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ISBN: 9783039217588 9783039217595 Year: Pages: 342 DOI: 10.3390/books978-3-03921-759-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:16
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Abstract

Smart sensors are technologies designed to facilitate the monitoring operations. For instance, power consumption can be minimized through on-board processing and smart interrogation algorithms, and state detection enhanced through collaboration between sensor nodes. Applied to structural health monitoring, smart sensors are key enablers of sparse and dense sensor networks capable of monitoring full-scale structures and components. They are also critical in empowering operators with decision making capabilities. The objective of this Special Issue is to generate discussions on the latest advances in research on smart sensing technologies for structural health monitoring applications, with a focus on decision-enabling systems. This Special Issue covers a wide range of related topics such as innovative sensors and sensing technologies for crack, displacement, and sudden event monitoring, sensor optimization, and novel sensor data processing algorithms for damage and defect detection, operational modal analysis, and system identification of a wide variety of structures (bridges, transmission line towers, high-speed trains, masonry light houses, etc.).

Keywords

optical crack growth sensor --- digital sampling moiré --- 2D crack growth --- calibration --- concrete crack --- feature extraction --- mapping construction --- fuzzy classification --- rotary ultrasonic array --- bending stiffness --- damage identification --- environmental noise --- bridge --- test vehicle --- structural impact monitoring --- sensors distribution optimization --- NSGA-II --- energy analysis of wavelet band --- principal component analysis --- transmission tower --- settlement --- wind force --- acceleration --- modal frequencies --- sudden event monitoring --- wireless smart sensors --- demand-based nodes --- event-triggered sensing --- data fusion --- patch antenna --- sensor --- structural health monitoring --- crack identification --- resonant frequency --- damage identification --- sensor optimization --- Virtual Distortion Method (VDM) --- Particle Swarm Optimization (PSO) algorithm --- sensitivity --- structural health monitoring --- piezoelectric wafer active sensors --- active sensing --- passive sensing --- damage detection --- acoustic emission --- uniaxial stress measurement --- structural steel members --- amplitude spectrum --- phase spectrum --- shear-wave birefringence --- acoustoelastic effect --- damage detection --- smartphones --- steel frame --- shaking table tests --- wavelet packet decomposition --- low-velocity impacts --- strain wave --- impactor stiffness --- data processing --- feature selection --- impact identification --- crack --- strain --- distributed dense sensor network --- structural health monitoring --- fibre bundle --- reflective optical sensor --- tip clearance --- turbine --- aero engine --- principal component analysis --- space window --- time window --- damage detection --- length effect --- stress detection --- electromagnetic oscillation --- steel strand --- concrete structures --- SHM --- stretching method --- model updating --- displacement sensor --- helical antenna --- resonant frequency --- perturbation theory --- normal mode --- wheel minor defect --- high-speed train --- online wayside detection --- Bayesian blind source separation --- FBG sensor array

Wood Properties and Processing

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ISBN: 9783039288212 / 9783039288229 Year: Pages: 350 DOI: 10.3390/books978-3-03928-822-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2020-06-09 16:38:57
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Wood-based materials are CO2-neutral, renewable, and considered to be environmentally friendly. The huge variety of wood species and wood-based composites allows a wide scope of creative and esthetic alternatives to materials with higher environmental impacts during production, use and disposal. Quality of wood is influenced by the genetic and environmental factors. One of the emerging uses of wood are building and construction applications. Modern building and construction practices would not be possible without use of wood or wood-based composites. The use of composites enables using wood of lower quality for the production of materials with engineered properties for specific target applications. Even more, the utilization of such reinforcing particles as carbon nanotubes and nanocellulose enables development of a new generation of composites with even better properties. The positive aspect of decomposability of waste wood can turn into the opposite when wood or wood-based materials are exposed to weathering, moisture oscillations, different discolorations, and degrading organisms. Protective measures are therefore unavoidable for many outdoor applications. Resistance of wood against different aging factors is always a combined effect of toxic or inhibiting ingredients on the one hand, and of structural, anatomical, or chemical ways of excluding moisture on the other.

Keywords

artificial weathering --- blue staining fungi --- colour change --- natural weathering --- wood --- marketing --- material preference --- urban housing --- immigrants --- building culture background --- building material --- chemical changes --- colour changes --- infrared spectroscopy --- hardwoods --- roughness --- Douglas-fir --- lumber --- non-destructive testing --- modulus of elasticity (MOE) --- stiffness --- thinning --- silviculture --- wood based composites --- hybrid beams --- bending stiffness --- flexural rigidity --- aluminium reinforcements --- wooden windows --- end-product-based fiber attribute determinates --- longitudinal stress wave velocity --- mixed-effects hierarchical linear models --- predictive performance --- bamboo grid packing --- cooling packing --- cooling tower --- mechanical properties --- fungi --- bamboo --- heat treatment --- wood --- structural changes --- nondestructive testing --- ultrasound --- Euler-Bernoulli --- modulus of elasticity --- neural network --- high frequency drying --- moisture content --- wood --- brittleness --- density --- dynamic strength --- High-Energy Multiple Impact (HEMI)–test --- Resistance to Impact Milling (RIM) --- bamboo grid packing --- cooling packing --- cooling tower --- chemical composition --- elemental composition --- FTIR --- color --- tropical woods --- brown rot --- Coniophora puteana --- colour --- CIEL*a*b* system --- technological and product innovations --- cyclic loading --- laminated wood --- deflection at the limit of proportionality --- deflection at the modulus of rupture --- wood-processing industry performance --- orthotropic --- elastic constants --- green larch --- compression --- three-point bending --- coefficient of wood bendability --- laminated wood --- technological and product innovations --- minimal curve radius --- orthotropic --- tensile modulus --- tensile strength --- moisture content --- relative humidity --- glued lamella --- flexible chair --- weight of a user --- ultimate state --- volume yield --- European hardwoods --- low quality round wood --- strength grading --- glulam --- ultrasonic wave velocity measurement --- nondestructive assessment --- wood mechanical properties --- intra-ring variation --- dynamic modulus of elasticity --- Pinus massoniana Lamb. --- phenol formaldehyde resin --- wood impregnation --- wood properties --- cell-wall mechanics --- ultrasonic speed --- poplar seedlings --- acoustic resonance --- density --- microfibril angle --- root-collar diameter --- machinability --- Eucalyptus --- plantation timber --- fiber-managed hardwoods

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