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Research Papers

Dynamic Properties of a Heliostat Structure Determined by Numerical and Experimental Modal Analysis

[+] Author and Article Information
J. Felipe Vásquez-Arango

Institute of Solar Research,
German Aerospace Center (DLR),
Pfaffenwaldring 38-40,
Stuttgart 70569, Germany
e-mail: Juan.VasquezArango@dlr.de

Reiner Buck

Institute of Solar Research,
German Aerospace Center (DLR),
Pfaffenwaldring 38-40,
Stuttgart 70569, Germany
e-mail: Reiner.Buck@dlr.de

Robert Pitz-Paal

Institute of Solar Research,
German Aerospace Center (DLR),
Linder Höhe,
Köln 51147, Germany
e-mail: Robert.Pitz-Paal@dlr.de

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 November 19, 2014; final manuscript received June 7, 2015; published online June 30, 2015. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 137(5), 051001 (Oct 01, 2015) (5 pages) Paper No: SOL-14-1345; doi: 10.1115/1.4030846 History: Received November 19, 2014; Revised June 07, 2015; Online June 30, 2015

An experimental and numerical modal analysis was performed on an 8 m2 T-shaped heliostat structure at different elevation angles. The experimental results were used to validate a finite element (FE) model by comparing natural frequencies and mode shapes. The agreement between experiments and simulations is good in all operating points investigated. In addition, damping coefficients were determined experimentally for each mode, in order to provide all necessary information for the development of a dynamic model. Furthermore, potentially critical operating conditions caused by vortex shedding were identified using a simple approach.

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Figures

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Fig. 1

Heliostat structure

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Fig. 2

Measurement system

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Fig. 3

Location of sensors and impacts

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Fig. 5

Comparison of mode shapes at 30 deg elevation angle

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Fig. 6

Comparison of mode 7 at different elevation angles

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Fig. 7

Vortex shedding frequency of an inclined flat plate

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