Analysis of the Dynamic Response of Photovoltaic Module Structures

Abstract

This paper presents an analysis of the dynamic response of a metal support structure for photovoltaic modules. The main objective of this study was identify the natural frequencies and validate a numerical model developed using finite element method. The structure was modeled using beam and shell elements, using commercial steel and aluminum profiles. The photovoltaic modules were considered as rigid bodies coupled to the structure. The experimental analysis was carried out using accelerometers positioned at strategic points on the structure. Excitations were applied by means of pulses. The Fast Fourier Transform (FFT) was applied to the signals obtained and processed. Furthermore, the four fundamentals frequencies were compared with the results by numerical modal analysis. The correlation between the data showed a relative error of less than 5% and a Pearson coefficient of more than 94%, demonstrating high fidelity between the models. The results validate the numerical modeling of the structure and show its applicability in future analyses, such as optimizing structural profiles and evaluating performance under dynamic loads. The methodology employed proves to be effective for modal characterization of structural systems applied to photovoltaic plants.