Condensation of Distributed Loads on Slender Body and Its Application in Aeroservoelastic Ground Simulation

Abstract

Aeroservoelastic ground simulation test is a new aeroelastic ground test technology developed in recent years. One of the key problems is the condensation of unsteady aerodynamic forces, that is, the distributed aerodynamic loads on flight vehicles are condensed into a few concentrated loads. The traditional condensation method deals with the distributed force with a simple force and moment balance criterion, or takes the support reaction forces as the condensation forces by solving the statically indeterminate problem. These methods have some disadvantages. In this paper, an equivalent condensation method based on one-dimensional spline interpolation is proposed for the distributed loads of slender vehicles, and the key mode similarity criterion is used to optimize the location of condensation points, so as to achieve the effects that the dynamic responses of slender body under the concentrated loads of condensation points are the closest to that under the distributed loads. The accuracy of the proposed condensation method is verified by two examples of simple supported beam and cantilever beam, and the condensation method is applied to the aeroservoelastic ground simulation of a slender missile. Numerical simulation shows that the unsteady aerodynamic force of the missile can be condensed into real-time concentrated force quickly and accurately by using this method, which meets the accuracy and rapidity requirements of aeroservoelastic ground simulation test.

Keywords

• |aeroservoelasticity|ground test|condensation of loads|slender body