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A new class of flexure-free torsional vibrations of annular rods

โœ Scribed by Bernard D. Coleman; Marzio Lembo; Irwin Tobias


Publisher
Springer Netherlands
Year
1996
Tongue
English
Weight
741 KB
Volume
31
Category
Article
ISSN
0025-6455

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โœฆ Synopsis


It is shown that the system of partial differential equations governing small amplitude vibrations of an elastic ring has solutions describing motions in which the axial curve C of the ring remains rigid, but executes a rocking motion while the cross-sections undergo torsional rotations about C that vary periodically both in time and in distance along C. This type of flexure-free torsional vibration can occur both in rings that are stress-free in a circular equilibrium configuration and in rings formed by bringing together and sealing, with or without the addition of twist, the ends of rods that are stress-free when straight.

Sommario. Si mostra the le equazioni the governano le oscillazioni di piccola ampiezza di travi elastiche anulari hanno soluzioni the corrispondono a moti nei quali l'asse C della trave b sottoposto a un'oscillazione rigida e le sezioni trasversali subiscono una rotazione torsionale the varia periodicamente nel tempo e con l'ascissa lunge C. Quest0 tipo di vibrazione torsionale, non accompagnata da flessione dell'asse, si presenta da quando la configurazione anulare t priva di sforzi sia quando tale configurazione pub pensarsi ottenuta inflettendo una trave the in uno stato privo di sforzi b ad asse rettilineo, imprimendo ad essa una eventuale deformazione torsionale, e collegando fra loro le sue estremith.


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