Abstract: The influences of cannon structure parameters on position and attitude of projectile at muzzle are reasonably assessed to improve firing accuracy. To solve the problem above, an interaction model of projectile and cannon was established firstly, which describes the position and attitude of projectile at muzzle with the input variables of 6-degrees-of-freedom rigid body trajectory equations. An approach of dynamic sensitivity analyses is presented, which is based on the theory of absolute correlation degree. The proposed approach is primarily used to compute the degrees of closeness among actual sequences of system performance indexes and their target sequences in different given conditions. Then on the basis of calculated results, statistical analyses are conducted, which shows the influences of controlled variables on system performance indexes in the given ranges and their optimum ranges. The dynamic sensitivity analysis of position and attitude of projectiles at muzzle is conducted with the help of the above model and the suggested approach on account of barrel and projectile's parameters. The proposed approach and relevant results were proved to be reasonable and feasible by comparisons. Key

Key words: ordnancescienceandtechnology, firingaccuracy, projectile, muzzle, interactionmodelofprojectileandcannon, dynamicsensitivityanalyses, absolutecorrelationdegree