Deficiency-surplus transition function (DeSuTra) in semi-empirical formulas for tumbling of freely falling card

• Autorzy: Vorohobovs Vladimirs , Kleinhofs Martins
• Języki publikacji: EN

Abstrakty

EN

A new phenomenological method for composing analytical formulae to describe dynamic systems using the DeSuTra function as a building block is introduced. Based on heuristic considerations, it is possible to write a correct formula with several unknown coefficients. Next, these coefficients are tuned such a way that the result coincides with the experimental data. To illustrate the viability of such a method, a simple but not trivial aerodynamic system was chosen: the autorotation of a rectangular piece of paper that falls in air. Three correction coefficients (diminishers) were introduced to calculate its rotation frequency Then a simple expression for the Magnus effect and drag force was used. All the obtained formulae were experimentally proved and the coefficients calculated. The conclusions drawn confirm the usefulness of the presented calculation procedure for the design of composites with chaotically distributed reinforcements.

Słowa kluczowe

EN

phenomenology; heuristics; semi-empirical research; tumbling cards; Magnus effect; autorotation; lift force; bifurcation; efficiency reducer; efficiency diminisher; DeSuTra function; singularity

PL

fenomenologia; heurystyki; badania półempiryczne; efekt Magnusa; autorotacja; siła nośna; bifurkacja; reduktor sprawności; zmniejszanie sprawności; funkcja DeSuTra

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2022
• Tom: R. 22, nr 2
• Strony: 92--98
• Opis fizyczny: Bibliogr. 33 poz., rys., tab.

Twórcy

autor

Vorohobovs Vladimirs

• Riga Technical University, Riga Institute of Aeronautics, Faculty of Mechanical Engineering, Transport and Aeronautics, 6B Ķīpsalas St., Kurzemes rajons, LV-1048, Riga, Latvia

autor

Kleinhofs Martins

• Riga Technical University, Riga Institute of Aeronautics, Faculty of Mechanical Engineering, Transport and Aeronautics, 6B Ķīpsalas St., Kurzemes rajons, LV-1048, Riga, Latvia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).