Based on rigid moving mesh technique

a unsteady method of simulating each pitching dynamic derivative was developed. Firstly

the pitching combined dynamic derivative was calculated by using the method of small amplitude pitching forced oscillation; then the lag of wash derivative could also be obtained by using the small amplitude plunging forced oscillation method; finally the pitching damping derivative was calculated by the difference between the combined dynamic derivative and the lag of wash derivative. The international dynamic derivative standard model Finner missile was taken as an example to testify the methods

the calculation error of pitching combined dynamic derivative is 2.76%

and the lag of wash derivative calculated is 11.5% of pitching damping derivative

in agreenment well with the references. The research shows that the methods of separating dynamic derivatives have been proved reliable and useful in engineering

and these methods can also be used in lateral and directional dynamic derivative analysis.