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Research Papers

Structural Dynamics Analysis of Three-Dimensional 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),
Adrar 01000, Algeria
e-mail: fferroudji@yahoo.fr

Cherif Khelifi

Unité de Recherche en Energies Renouvelables
en Milieu Saharien (URERMS),
Centre de Développement des Energies
Renouvelables (CDER),
Adrar 01000, Algeria
e-mail: khelifiam@yahoo.fr

Toufik Outtas

Laboratoire de Mécanique des Structures et
Matériaux,
Université Batna 2,
Batna 05000, Algeria
e-mail: tf_outtas@hotmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received July 18, 2016; final manuscript received December 14, 2017; published online February 27, 2018. Assoc. Editor: Werner J. Platzer.

J. Sol. Energy Eng 140(3), 031004 (Feb 27, 2018) (11 pages) Paper No: SOL-16-1331; doi: 10.1115/1.4039272 History: Received July 18, 2016; Revised December 14, 2017

Sun-tracking system (STS) 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 STS that are subject to dynamic loads (wind, snow, etc.), vibrations, and gravitational loads. This paper presents the structural dynamic analysis of a 24 m2 bi-axial STS (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 (MPF), 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 STS (PV applications).

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Figures

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Fig. 1

solidworks model of PV power station and bi-axial STS: (a) PV power station is composed of four STSs isometric view at elevation angle of 50 deg, (b) STS isometric view at elevation angle of 50 deg, (c) side view at elevation angle of 50 deg, and (d) side view at elevation angle of 0 deg

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Fig. 2

Mesh generation model of STS

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Fig. 3

The third mode of vibrations of the STS for six elevation angles: (a) first, (b) second, and (c) third mode

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Fig. 4

First 20th natural frequencies under six elevation angles of the STS

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Fig. 5

First 20th MPFs in the X, Y, and Z directions versus frequency for the STS

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Fig. 6

(a) Diagram of wind load action and (b) exterior excited frequencies of structure of the STS for different elevation angles

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Fig. 7

Shapes and frequencies of modes have significant mass participation in the X-direction

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Fig. 8

Shapes and frequencies of modes have significant mass participation in the Y-direction

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Fig. 9

Shapes and frequencies of modes have significant mass participation in the Z-direction

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