Abstract
Models of planar and spatial statically determinate regular trusses and analytical solutions of the problem of calculating natural frequencies are considered. A beam planar truss with triangular lattice, planar and spatial cantilever trusses are considered. To calculate the forces in the elements of the structure and calculate the rigidity of the structure in an analytical form, the computer mathematics system Maple was used. The dependence of the solutions on the number of panels was found by the induction method. To do this, we looked for common members of the sequences of coefficients included in solutions for trusses with a sequentially increasing number of panels. An algorithm for calculating the estimate of the first frequency by Dunkerley is given. In the spectra of eigenfrequencies of regular structures, frequencies are found that are the same for structures of any order (spectral constants) and frequencies with the same number in ordered spectra, forming curves in the axes “frequency number in the spectrum - order of construction” curves tending to spectral constants.
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Acknowledgements
The research is partially funded by the Ministry of Science and Higher Education of the Russian Federation under the strategic academic leadership program ‘Priority 2030’ (Agreement 075-15-2021-1333 dated 30.09.2021).
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Kirsanov, M., Buka-Vaivade, K., Shirokov, A. (2022). Models of Spatial and Planar Light Bar Structures in the Maple System. In: Manakov, A., Edigarian, A. (eds) International Scientific Siberian Transport Forum TransSiberia - 2021. TransSiberia 2021. Lecture Notes in Networks and Systems, vol 403. Springer, Cham. https://doi.org/10.1007/978-3-030-96383-5_133
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