During the separation process of embedded-backward submunition,the bullet enters a semi-constrained state when the rear and middle hangings detach from the guideway.Therefore,the movement attitude of the bullet is significantly affected by the carrier vehicle.The contact collision between the hanging and the guideway,as well as the aerodynamic interference of the carrier vehicle on the bullet,have great influences on the separation process.In order to provide important theoretical support for the design of the submunition high-speed separation system and achieve safe separation of the submunition,a high-precision space-time numerical simulation security evaluation method of the high-speed separation for submunition were proposed.Based on the constructed aerodynamic response surface model and the variable-configuration variable-mass multibody dynamics model of the submunition,the multibody-aerodynamic fluid-structure coupling high-precision space-time numerical simulation platform for the variable-configuration variable-mass combination of the separation process for submunition was established.Different initial boundary conditions were applied to the fluid-structure coupling dynamics model and simulation was carried out to obtain the attitude parameter of the submunition separation process Then,the separation safety of the submunition dynamically evaluated,and the safety initial boundary conditions of the submunition separation was obtained.It can provide a quantitative design basis for formulating technical measures that are conducive to improving the safety of high-speed separation of submunition.Through simulation example and test,it is shown that the constructed high-precision space-time numerical simulation platform for high-speed separation of submunition has high accuracy and credibility.The research results provide important engineering value for the security design of high-speed separation for submunition.
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