Two on step ahead wind speed forecasting models were compared. A univariate model was developed using a linear autoregressive integrated moving average (ARIMA). This method’s performance is well studied for large number of prediction problems. The other multivariate nonlinear exogenous artificial neural network (NARX). uses the variables: barometric pressure, air temperature, direction and solar radiation or relative humidity, as delayed speed. Both from two databases sites: an hourly...

IEC 61400-2 establishes the Simplified Load Method for designing low-power wind turbine blades without considering dynamic loads in simplified load methodology. This paper analyzes hypotheses established by standard, also natural frequencies a 900 W blade. The research methodology begins with design parameters, application of BEM Method, and use QBlade software. Then, standard are defined. Finally, structural modal analysis blade were conducted using FEM-based results show that minimum...

El aprovechamiento de la energía hidráulica en sistemas tuberías representa una alternativa eficiente y sostenible para generar electricidad a pequeña escala. En este contexto, las turbinas tipo Savonius son opción obtención redes distribución agua, ya que convierten cinética del agua mecánica o eléctrica, siendo ideales espacios confinados comunidades con recursos limitados. estudio, se simuló el efecto número álabes velocidad flujo usando Dinámica Fluidos Computacional (CFD, por sus siglas...

Wind turbine blades are made from fiberglass, whose faces eroded due to environmental conditions. Polyurethane (PU) coatings broadly used in several types of their strong adhesion. However, inferior mechanical properties limit application on fiberglass. In this study, graphene oxide (GO) was modified through a dielectric barrier plasma (DBP) treatment at atmospheric pressure improve the dispersion GO PU and increase its adhesion fiberglass (GF) substrates, resulting excellent PU/GO coating...

Abstract This paper presents a study of wind speed time series from La Venta, Oaxaca, Mexico. The consists anemometric measurements taken by the Federal Electricity Commission Mexico throughout little over 6 years. was conducted to calculate Hurst correlation coefficient using: box counting, rescaled range, power spectrum, detrended fluctuation analysis, and multifractal analysis techniques. main objective this research is know among data obtain better description real conditions series,...

The use of small wind turbines (SWTs) is an alternative energy strategy with increasing potential for satisfying in situ electrical demands and should be studied to promote social penetration. Valley Mexico Metropolitan Area (VMMA) has air pollution issues that need addressed. This resulted programs monitoring atmospheric variables, such as speed. By selecting using 3 years’ worth available data, we developed a methodology study the technical economic feasibility SWTs VMMA. To this end, 28...

This paper presents three-dimensional numerical simulations and experimental investigations of cavitating flow through an axial inducer. Particularly, this work focuses on the influence radial tip clearance cavitation behavior. Numerical analysis was carried out two different configurations: first, inducer modeled without taking into consideration. Later, with nominal some modifications this. It found that has a significant overall performance in non-cavitating regime because small size...

The use of specialized devices, such as orthopedic has become indispensable in the lives people with disabilities since ancient times. primary purpose devices is to perform activities and solve problems that afflict their bearers any extremity body. One most recurrent occurs lower extremities regarding mobility autonomy. In addition, considered a tool lighten repetitive heavy rehabilitation work physiotherapists while improving patient’s recovery efficiency. A significant challenge great...

Wind speed turbulence intensity is a crucial parameter in designing the structure of wind turbines. The IEC61400 considers Normal Turbulence Model (NTM) as reference for fatigue load calculations small and large La Ventosa relevant region development power sector Mexico. However, literature, there are no studies on this important zone. Therefore, we present an analysis to improve understanding local winds contribute reliable technical solutions. In work, experimentally estimate shear...

Given the increasing integration of wind-based generation systems into electric grid, efforts have been made to deal with problem power quality associated intermittent nature these systems. This paper presents a new modelling approach oriented towards harmonic distortion analysis induction machine for wind applications. The model is developed using companion circuit modelling, which natural adverse effects in systems, and represents an easier solution method than well known dynamic domain,...

This article presents a numerical simulation of an unsteady cavitating flow. First, the analysis was carried out for two-dimensional (2D) venturi-type geometry, and then 2D blade cascade simulating axial inducer. The main purpose this work is to explore local cavitation instabilities, such as alternate rotating cavitation, which can appear in inducers. performed using commercial code based on cell-centred finite-volume method. model used calculations assumes thermal equilibrium between...

The main objective of this work is to analyze and configure appropriately the input vectors enhance performance NARX models forecast solar radiation one hour ahead. For study, Engle–Granger causality tests were implemented. Additionally, collinearity among meteorological variables databases was examined. Different used test contribution these analyses in improvement vectors. that, from three cities Mexico with different climates obtained, namely: Chihuahua, Temixco, Zacatecas. These...

The flow field in a steam turbine main stop valve bypass (MSVBV) has been investigated by means of CFD simulations. Because the entire to during start ups is carried MSVBV it subject serious solid particle erosion problems and requires frequent replacement avoid catastrophic damage which can occurred when skirt eroded through causing large pieces metal be directly into turbine. For some most important geometric parameters MSVBV, design recommendation have made.

Purpose This paper aims to validate an axial turbine modified nozzle design, looking for a reduction of the erosion process during operation in power plants. Design/methodology/approach The approach taken is numerical simulation using computational fluid dynamics (CFD) tool, comparing original and proposed/modified designs. Findings provides information about how achieve solution operational problem (abrasive wear) by analysis flow patterns under variety conditions. Research...

This paper presents an analysis of sound pressure levels through theoretical modeling and experimental validation in a 1 kW small wind turbine. The models used the are BPM (Brooks, Pope, Marcolini) BM (Brooks Marcolini), where turbine blades divided sections, each section has its own contribution with respect to total emitted level. noise propagation study were accomplished within requirements standard IEC 61400-11 Ed.3 NOM-081-SEMARNAT-1994. comparative results showed that methods have...

In this paper, a methodology for short-term forecasting of power generated by photovoltaic module is reported. The method incorporates nonlinear autoregressive with exogenous inputs (NARX) fed the solar radiation and temperature times series, as well an estimation time series obtained implementing ideal single diode model. This synthetic was validated against actual module. NARX model has been implemented in conjunction corrective vector multiplier (CVM) technique, which uses under clear sky...

This paper describes the evaluation of a single output, online, and time domain modal parameters identification technique based on differential algebra operational calculus. In addition, an analysis frequency response function (FRF) system is conducted in specific set up, emulating its nominal or conditions to determine influence non-linearities over dynamic behavior those particular magnitudes deformations; thus, this quantified by numerical index. methodology applied wind turbine blade...