We model the dynamical behavior of a three dimensional (3-D) dissipative oscillator consisting of a m-block whose vertical fall occurs against a spring and which can also slide horizontally on a rigid truss rotating at an assigned angular speed ω(t). The bead’s z-vertical time law is obvious, whilst its x-motion along the horizontal arm is ruled by a linear differential equation we solve through the Hermite functions and the Kummer (1837) [1] confluent Hypergeometric Function (CHF) 1F1. After the rotation θ(t) has been computed, we know completely the m-motion in a cylindrical frame of reference so that some transients have then been analyzed. Finally, further effects as an inclined slide and a contact dry friction have been added to the problem, so that the motion differential equation becomes inhomogeneous: we resort to Lagrange method of variation of constants, helped by a Fourier–Bessel expansion, in order to manage the relevant intractable integrations.
Bocci, A., Mingari Scarpello, G., Ritelli, D. (2018). Hypergeometric solutions to a three dimensional dissipative oscillator driven by aperiodic forces. APPLIED MATHEMATICAL MODELLING, 53, 71-82 [10.1016/j.apm.2017.07.055].
Hypergeometric solutions to a three dimensional dissipative oscillator driven by aperiodic forces
Mingari Scarpello, GiovanniMembro del Collaboration Group
;Ritelli, Daniele
Membro del Collaboration Group
2018
Abstract
We model the dynamical behavior of a three dimensional (3-D) dissipative oscillator consisting of a m-block whose vertical fall occurs against a spring and which can also slide horizontally on a rigid truss rotating at an assigned angular speed ω(t). The bead’s z-vertical time law is obvious, whilst its x-motion along the horizontal arm is ruled by a linear differential equation we solve through the Hermite functions and the Kummer (1837) [1] confluent Hypergeometric Function (CHF) 1F1. After the rotation θ(t) has been computed, we know completely the m-motion in a cylindrical frame of reference so that some transients have then been analyzed. Finally, further effects as an inclined slide and a contact dry friction have been added to the problem, so that the motion differential equation becomes inhomogeneous: we resort to Lagrange method of variation of constants, helped by a Fourier–Bessel expansion, in order to manage the relevant intractable integrations.File | Dimensione | Formato | |
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