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research-article

Structural Dynamics Analysis of 3-D Bi-axial Sun-tracking System Structure Determined by Numerical Modal Analysis

[+] Author and Article Information
Fateh Ferroudji

Unité de Recherche en Energies Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER, 01000, Adrar, Algeria
fferroudji@yahoo.fr

Cherif Khelifi

Unité de Recherche en Energies Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER, 01000, Adrar, Algeria
khelifiam@yahoo.fr

Toufik Outtas

Laboratoire de Mécanique des Structures et Matériaux, Université Batna 2, Algeria
tf_outtas@hotmail.com

1Corresponding author.

ASME doi:10.1115/1.4039272 History: Received July 18, 2016; Revised December 14, 2017

Abstract

Sun-tracking system is a key factor for solar photovoltaic (PV) future and new answers for the solar market. It will expand large scale PV-projects (PV farms) worldwide, and it is possible to collect more energy from the sun. PV farms consist of thousands of sun-tracking systems (STS) that are subject to dynamic loads (wind, snow, etc.), vibration, and gravitational loads. This paper presents the structural dynamic analysis of a 24 m² bi-axial sun-tracking system (azimuth-elevation) at different elevation angles based on its modal parameters (natural frequencies, modal shapes and modal damping ratios) and dynamic performance indices (Modal participation factors, forcing frequencies and mechanical quality factors) by means of the Finite Element Analysis (FEA). The simulation results show that the structural dynamic design of the STS meets the desired structural requirements and agrees well with structural dynamic standards (EN 1991-1-4 and ASHRAE). These results can be used for further analysis on optimal design and vibration safety verification for the bi-axial sun tracking systems (PV applications).

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