Criteria and conditions for static and dynamic stability of the wing-in-ground-effect vehicle in longitudinal motion above the support surface

Аuthors

Krivel' S. M.^{1, 2}

1. Irkutsk state university, Irkutsk, Russia
2. Irkutsk National Research Technical University, 83, Lermontov str., Irkutsk, 664074, Russia

e-mail: krivel66@mail.ru

Abstract

The article presents the derivation of mathematical expressions and substantiation of crite-ria for static and dynamic stability of the WIG in longitudinal motion. A distinctive feature of the proposed criteria is the use of the position of the center of pressure of the WIG as one of the key parameters. The expediency of using the position of the center of pressure and derivatives of its position in time as components for the parameters of assessing the stability of the WIG is justified instead of using the concepts of "focus in angle of attack" and "focus in distance". The criteria and conditions for static and dynamic stability are de-termined on the basis of linearized equations of longitudinal motion of the WIG and the use of a parametric approach to assessing the stability of automatic control theory systems. An analysis of the conditions for ensuring the stability of the WIG has been performed. An example of stability estimation and calculation of transient functions of the perturbed longitudinal motion of the screenplane is given.
It is shown that the position of the center of mass is not explicitly included in the expres-sion of the criterion for assessing the static stability of the WIG. Based on this, it is con-cluded that, unlike an aircraft flying outside the zone of influence of the screen, it is appar-ently impossible to radically change the stability characteristics in longitudinal motion by changing the position of only the center of mass. It is advisable to ensure that the center of pressure is positioned with the elevator not deflected behind the center of mass in relation to the direction of flight.
The application of the proposed methodology for assessing the stability of the WIG in longitudinal motion in combination with other methods makes it possible to improve the quality and reliability of design at the initial stages.

Keywords:

ekranoplan, dynamics of the movement of the WIG, stability of the WIG, criteria of stability of the WIG, GEV (ground-effect vehicle), WIG (wing-in-ground-effect)

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