Effect of modal selection on static aeroelastic analysis

The flexibility method and modal approach are usually used in structural analysis in the static aeroelastic research. Compared to the flexibility method which is mature but brings higher computational cost for the solution, the modal approach has the advantage of significant reduction in the dimension of the problem, high efficiency and convenient for verification. However, there are no principles for the selection of modes and one must have enough engineering experience to fully utilize the modal approach in practice. To provide modal approach with its own quantitative criteria in practice, this paper first proposes the idea of modal influence coefficient to evaluate the effect of modal selection on modal approach of aeroelastic analysis. In order to validate the rationality and validity of the modal influence coefficient, the paper carrys out control efficiency and aeroelastic correction analysis for a typical aircraft. The results show that the modal influence coefficient can accurately evaluate the effect of modal selection on static aeroelastic analysis, thus providing some helpful reference in practice.