Cradle Lining Tile Barrel Cylindrical Section Contact Dynamics

Under the background of a important National Defense Project, this paper is concerned with contact dynamics of simulated recoil for a canon barrel with large displacement by combination of theoretical analysis, numeric calculation and experiment. The main contents of this paper are as follow:Firstly, dynamics modeling theory and method for mechanism with clearance was examined. In light of contact/impact between barrel and bushes of cradle, rigid-rigid, flexible-flexible contact dynamics models were built up. The interface condition and search algorithm of contact/impact were discussed.Secondly, dynamics model was constructed for recoil of a cannon's barrel with large displacement by means of software ADAMS, in which flexible deformation of the barrel and bush was taken into consideration. The barrel and bushes were meshed by isoparametric element with 8 nodes, the master nodes and slave nodes were constructed separately, and the modal neutral file used by ADAMS was generated. The Fortran code of gas force, force generated by recuperator and recoil mechanism was created and embedded into ADAMS by means of dynamic link library. Based on classical model, rigid-rigid model, and flexible-flexible model, respectively, computation was performed for recoil dynamics of the barrel with large displacement, and time history of contact force between the barrel and bushes was obtained. Results from three different methods were compared and analyzed.Thirdly, scheme design was conducted for experiment system used for simulating recoil process of a cannon's barrel with large displacement, in which structural design of closed bomb was focused on. Testing plan of gas pressure in closed bomb, vibration of cradle, acceleration and angular velocity of muzzle was.designed. The dynamics parameters during recoil process of the barrel with large displacement were collected by conducting experiment, and which were compared with the numeric results, and from which validation of theoretical model presented in this paper was completed.The theoretical and experimental research results of recoil dynamics for the barrel with large displacement recoil movement achieved in this paper can be of certain reference to cannon dynamic design.