Study on dynamic simulation of hinged flap mechanism considering wear evolution

Abstract

Due to the significant differences in aerodynamic loads offlaps at different positions, there are also significant differences in the loads borne by bearings at different flap angles. This leads to inconsistent wear depth of bearings at different angles. Therefore, the method of introducing uniform wear depth is difficult to apply to the dynamic characteristics analysis of flaps. To address this issue, a dynamic modeling method based on the least squares method is proposed. Firstly, based on the connection characteristics of the flap surface, the C-B method is used to make it flexible, and the RBE2 element is used to establish a rigid flexible coupling dynamic model. On this basis, combining with UAMP, DISP and UMESHMOTION subroutines, the uneven wear data of hinge bearings are obtained by using the wear evolution simulation. At the same time, the function relation among the wear depth, flap deflection angle, and friction coefficient is established via least squares fitting. Finally, the function relation is updated to the rigid-flexible coupling dynamic model by the offset of the hinge bearing center point and the friction coefficient of the ball pair, so as to obtain the dynamic response of the flap under the influence of wear, which verifies the applicability and effectiveness of the method. As wear progresses, the coaxiality of the inner and outer bearing shafts of the flaps decreases gradually, and the driving torque on the inner and outer sides increases accordingly. The maximum increase is 15.08%. This method can provide some support for designing the flap mechanism and bearing selection.

Keywords

• flap mechanism
• dynamics
• rigid-flexible coupling
• wear evolution
• least squares