MODAL ANALYSIS OF PARABOLIC TROUGH SOLAR COLLECTOR BASED ON MODAL PARTICIPATION FACTOR

Yang Yuke; Sun Beibei

doi:10.19912/j.0254-0096.tynxb.2025-0577

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 260-269. DOI: 10.19912/j.0254-0096.tynxb.2025-0577

MODAL ANALYSIS OF PARABOLIC TROUGH SOLAR COLLECTOR BASED ON MODAL PARTICIPATION FACTOR

Yang Yuke, Sun Beibei

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Abstract

To address the research demand for the vibration characteristics of parabolic trough solar collectors, the theoretical expressions for modal participation factors and cumulative effective mass participation ratios are derived based on the differential equations of motion in structural dynamics. In finite element modal analysis, the modal truncation criterion requiring the cumulative effective mass participation ratio to reach 90% is adopted to determine the number of modes to extract, and computational modal parameters under different pitch angles are obtained. Concurrently, field modal tests are conducted on a parabolic trough solar collector prototype to obtain experimental modal parameters under multiple operating conditions. The results show that extracting the first 15 modes yields a cumulative effective mass participation ratio of 91.20%, which satisfies the engineering requirement for dynamic analysis. The corresponding mode shapes from tests and simulations are highly consistent, with a maximum relative error of 3.86% for natural frequencies, thus effectively validating the applicability of the established finite element model.

Key words

solar collectors / vibration measurement / mesh independence analysis / natural frequencies / modal mode shape / modal participation factor

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Yang Yuke, Sun Beibei. MODAL ANALYSIS OF PARABOLIC TROUGH SOLAR COLLECTOR BASED ON MODAL PARTICIPATION FACTOR[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 260-269 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0577

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