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.
Dynamic Properties of a Heliostat Structure Determined by Numerical and Experimental Modal Analysis
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.
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Felipe Vásquez-Arango, J., Buck, R., and Pitz-Paal, R. (October 1, 2015). "Dynamic Properties of a Heliostat Structure Determined by Numerical and Experimental Modal Analysis." ASME. J. Sol. Energy Eng. October 2015; 137(5): 051001. https://doi.org/10.1115/1.4030846
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