The energy method for mass analyzing of spring landing gear of a light aircraft

Аuthors

Kicheev V. E.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

e-mail: m.oskb@yandex.ru

Abstract

In light aircraft design commonly used the spring gear, wherein the shock absorbers are used as springs working in bending and they absorb the main part of the impact energy during landing. At the initial stage of aircraft designing we must have a valid value of the relative weight of landing gear. For the following development of reliable methods for mass calculation of light aircraft landing gear the task of analysis of specific load on the wing and material mechanical characteristics depending on the relative mass of the spring main landing gear is assigned. An ideal equal stress spring of rectangular cross-section has been considered. The relationship between the strain energy and mechanical characteristics of springs material and main design parameters has been found out. Using Aviation Regulations AP -23 the work of external forces absorbed by a leaf spring has been determined. From the condition that the work of external forces and strain energy are equal an analytical relationship between relative weight of all the springs of the main landing gear and specific load on the wing and material mechanical characteristics has been found. The strong influence of the material on springs relative weight has been shown.

Keywords:

light aircraft, landing gear, depreciation, spring

References

1. Arep’ev A.N. Proektirovanie legkikh passazhirskikh samoletov (Design of passenger aircraft), Moscow, MAI, 2006, 637 p.
2. Rabinovich I.M. Osnovy stroitel’noi mekhaniki sterzhnevykh sistem (Principles of structural mechanics of core systems),Moscow, Gosstroiizdat, 1960, 519 p.

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