Study on dynamics modeling of missile with deflectable nose

Deflectable nose is one alternative control method of missiles, and the dynamics modeling is the foundation of the research on it. Schiehlen's method is used for dynamics modeling of a missile with deflectable nose , which is a multi-rigid body system consisting of body and nose. First the motion states of missile body and nose are expressed with generalized coordinates, and the motion of nose is obtained using the relative motion relation. Then Newton-Euler equation is used for both missile body and nose, and the constraint force in the equations are eliminated using D'Alembert's principle, simultaneously the degree of the equations reduce as equal as the degree of freedom of the system. At last the dynamics modeling is validated by simulation and some characteristics of deflectable nose are analysed. The results indicate that the deflectable nose control provides high effectiveness and great maneuverability, and has a quick response. It has been shown that Schiehlen's method is well suited for multi-rigid body system such as nose control missiles, which have fewer components and more degrees of freedom.