An improved analysis of free torsional vibration of axially loaded thin-walled beams with point-symmetric open cross-section
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The objective of the paper is to analyze the influence of bimoment induced by constant axial loads on the free motion of thin-walled beams with point-symmetric open cross-section. For various boundary conditions, a closed-form solution for natural frequencies of free harmonic vibrations was derived by using a general solution of governing differential equations of motion based on Vlasov's theory. In order to investigate the effect of the bimoment on natural frequencies, the numerical examples with symmetric Z cross-section are given. The obtained results, verified using an ANSYS finite element model, demonstrate that the influence of the bimoment is important in the assessment of torsional natural frequencies.
Keywords:Thin-walled beams / Free vibrations / Bimoment / Axial loading / Z cross-section
Source:Applied Mathematical Modelling, 2016, 40, 23-24, 10199-10209
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