Obtaining the strain data all along optical fiber, with adequate spatial resolution and accuracy, opens new possibilities for structural tests health monitoring. Formerly, only point sensors, as gages or fiber Bragg grating, were available, information about response to loads was restricted those points on which sensors bonded. Unless a sensor located near damage initiation point, details failure growth lost. With distributed system, is given an array of position in temperature at this...

Fiber-optic sensors cannot measure damage; to get information about damage from strain measurements, additional strategies are needed, and several alternatives available in the existing literature. This paper discusses two independent procedures. The first is based on detecting new strains appearing around a spot. structure does not need be under loads, technique very robust, detectability high, but it requires located close damage, so local technique. second approach offers wider coverage...

Developing an eco-friendly industry based on green materials, sustainable technologies, and optimum processes with low environmental impact is a general societal goal, but this remains considerable challenge to achieve. Despite the large number of research structural composites, limited investigation into most appropriate manufacturing methodology develop material at industrial level has taken place. Laboratory panels have been manufactured different natural fibers methodologies values...

Due to the nature of composites, ability accurately locate low-energy impacts is crucial for Structural Health Monitoring (SHM) in aerospace sector. For this purpose, several techniques have been developed past and, among them, Artificial Intelligence (AI) has demonstrated promising results with high performance. The non-linear behaviour AI-based solutions made them able withstand scenarios where complex structures and different impact configuration introduced; making accurate location...

Abstract: Despite existing several techniques for distributed sensing (temperature and strain) using standard Single Mode optical Fiber (SMF), compensating or decoupling both effects is mandatory many applications. Currently, most of the require special fibers are difficult to implement with high spatial resolution techniques, such as ϕ-PA-OFDR. So, this work’s objective study feasibility temperature strain out a ϕ-PA-OFDR readouts taken over an SMF. For purpose, will be subjected Machine...

Despite several existing techniques for distributed sensing (temperature and strain) using standard Single-Mode optical Fiber (SMF), compensating or decoupling both effects is mandatory many applications. Currently, most require special fibers are difficult to implement with high-spatial-resolution techniques, such as OFDR. Therefore, this work’s objective study the feasibility of temperature strain out readouts a phase polarization analyzer OFDR (ϕ-PA-OFDR) taken over an SMF. For purpose,...

One of the most important applications remote imaging systems in agriculture, with greatest impact on global sustainability, is determination optimal crop irrigation. The methodology proposed by Food and Agriculture Organization (FAO) based estimating evapotranspiration (ETc), which done computing reference (ETo) multiplied a coefficient (Kc). Some previous works methods to compute Kc using images. present research aims at complementing these systems, ETo use soil moisture sensors. A kikuyu...

Loss of dynamic brake is one the important issues AC electric mining trucks. The lack reduces safety and worries truck driver. driver may be forced to use service brake, which increases cost repair maintenance. Also, designed for speeds less than 3-6 mph not proper high speeds. has retard contactors in series with grid resistors. When presses pedal reduce speed, are closed power traction motors transferred inverter cabinet then dissipated on resistances. Each contactor includes main contacts...

Non-contact vibration measurements are relevant for non-invasively characterizing the mechanical behavior of structures. This paper presents a novel methodology full-field vibrational analysis at high frequencies using three-dimensional digital image correlation technique combined with projection speckle pattern. The method includes stereo calibration and processing routines accurate data acquisition. Quantitative allows extraction several deformation parameters, such as cross-correlation...

Analyses of U.S. Environmental Protection Agency (EPA) certification data, California Air Resources Board surveillance testing and EPA research data indicated that EPA's MOBILE6.2 emission factor model substantially underestimates emissions gaseous air toxics occurring during vehicle starts at cold temperatures for light-duty vehicles trucks meeting Tier 1 later standards. An unofficial version the was created to account these underestimates. When this used project into future, increased by...

We propose a linear regression method for estimating Weibull parameters from life tests. The uses stochastic models of the unreliability at each failure instant. As result, heteroscedastic problem arises that is solved by weighted least squares minimization. main feature our an innovative s-normalization data models, to obtain analytic expressions centers and weights regression. has been Monte Carlo contrasted with Benard's approximation, Maximum Likelihood Estimation; it highest global...

We present a methodology for reducing straight line fitting regression problem to Least Squares minimization one. This is accomplished through the definition of measure on data space that takes into account directional dependences errors, and use polar descriptors lines. strategy improves robustness by avoiding singularities non-describable The powerful enough deal with non-normal bivariate heteroscedastic error models, but can also supersede classical methods making some particular...

Abstract The preliminary analysis of laminate composite was conducted to analyse the optimal number layers for aircraft radome application. In this work, ESAComp software used predict displacement during flight operation. is a finite element and conceptual design layers. Flax fibre, glass fibre epoxy resin were applied as hybrid design. construction consists flax center sandwiched between fibre. Both fibres have same weave pattern which twill 2/2 200 gsm. material properties each materials...

We present a straightforward, non-intrusive adaptive bit rate streaming segment quality selection policy which aims at extending battery lifetime during playback while limiting the impact on user's of experience, thus benefiting consumers video services. This relies relationship between available channel bandwidth and representations in ladder. It results from characterization energy consumed by smartphones when running client applications for different network connections (Wifi, 4G, 5G)...