Fuze Centrifugal Force Drive Shaft The Vertical Rotor Dynamic Characteristics Analysis

In order to provide the reference for time fuze's optimization design of the 57mm artificial rainfall bomb, using the rigid dynamics vector method to analyze applied force of the fuze rotor drived by centrifugal force, whose axis is perpendicular to the projectile's axis. Rigid body dynamics model of fuze rotor's rotating-around fixed axis was established under the condition that the fuze rotor mass center doesn't coincide with geometric center and has an offset from spin axis of the projectile. In addition, the research that design principle of the fuze rotor mentioned above is presented.The fuze rotor's mass center doesn't coincide with geometric center and has an offset from spin axis of the projectile. In such general condition, the rigid dynamics vector method is adopted to analyze fuze rotor applied force when the 57mm artificial rainfall bomb flies away from the artillery point. In view of, currently, dynamics analysis of fuze rotor mentioned above is not sufficient and difficult to guide and solve optimal design problems, rigid dynamics model was established by vector method, which is the motion process of the fuze rotor rotating round fixed axis and delay arming. Besides, the effect of spin eccentricity, Coriolis force and nutation force on rotor motion was fully considered in this rigid dynamics model. The established rigid dynamics model provides theoretical support for the optimization design of the fuze rotor (fuze rotor is drived by centrifugal force and its axis is perpendicular to the axis of the projectile).As the fuze rotor is drived by centrifugal force, whose axis is perpendicular to the axis of the projectile, its starting time was discussed. Thus the formula of projectile'acceleration corresponding to the start time could be used to determine fuze rotor's starting characteristics, that is, determine whether the fuze rotor can start reliable, and if do, determine whether starting point is in the bore. As examples the starting points of arming movement of garnet-2 fuze rotor were calculated. Come to the conclusions that the dispersion of starting points was smaller with the eccentricity decrease, the dispersion of starting points was larger with the eccentricity increase.The balance angle of finishing time, when the fuze was stationary relative to the bore again after it started, was analyzed. For the general condition that the fuze rotor's mass center doesn't coincide with geometric center and has an offset from spin axis of the projectile, the equation of fuze rotor motion was programmed and solved. Therefore through above equation, the starting point and finishing time's balance angle of Grenade-2 fuze rotor were solved. By establishing force equilibrium equations, the numerical value of starting point and finishing balanced angle was examined. The finishing balanced angle was larger with the eccentricity increase and was regular change with initial azimuth relative to the rotation axis of the projectile. Via the design principle of the fuze rotor—the fuze rotor is drived by fuze centrifugal force and its axis is perpendicular to the axis of the projectile—being researched in previous section, take Grenade-2 fuze as an example, the the parameters of Grenade-2 fuze's mechanism design was analyzed, such as diameter of axle, mass center location, friction coefficient, rotating eccentric. Ballistie environment's impact on both the fuze rotor's starting characteristics and finishing state's equilibrium contact angle were analyzed. Come to the rotor design principles which provide a reference for fuze vertical rotor optimization design.