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Ancora sull'integrazione di equazioni della meccanica a coefficienti lentamente variabili

Giovanna Boschi Pettini — 1976

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

On the basis of the results of a previous article, it has been obtained an approximate explicit expression of the lagrangian parameters Q i and their time-derivatives Q ˙ i with errors of order ϵ 2 . All that has been achieved for a mechanical system possessing two degrees of freedom and subjected to slowly time-variable constraints.

Integrazione, in seconda approssimazione, di equazioni della meccanica a coefficienti lentamente variabili

Giovanna Boschi Pettini — 1975

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

In this paper the problem of the small oscillations of a mechanical or electric system, with two degrees of freedom and some of the involved parameters slowly varying with time, is analysed. An approximate solution, valid in a vary large time interval,is obtained.

Sull'integrazione approssimata di alcune equazioni della Meccanica

Giovanna Boschi Pettini — 1973

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

The author considers the differential equation: q ¨ + ω 2 ( ϵ t ) q = f ( t ) where ϵ is a small number. He finds an approximate solution of (1) with an error O ( ϵ 2 ) , when f ( t ) = 0 , and with an error O ( ϵ ) when f ( t ) 0 . He exposes some applications of his results to a problem of mechanics.

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