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Subject classification: 61.72.Lk; 68.35.Ct; S1.61; S5.11The elastic displacement and stress fields of a bicrystalline thin foil formed by two welded anisotropic crystals are calculated when a biperiodic misfit dislocation network lies along the interface separating the two anisotropic crystal components. The analysis is similar to that already presented by us in this journal [R. Bonnet, phys. stat. sol. (a) 180, 487 (2000)] for two isotropic crystals. From calculations applied to the (111)CoSi 2 /(111)Si interface, anisotropic effects are shown to be much stronger near the heterointerface.

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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