Research on Motion Characteristics for Latching Mechanism of MEMS Safety and Arming Device under Dual Environmental Forces

To improve the matching design of safety and arming device parallel to the projectile axis with micro detonation sequence and plastic deformation under setback force, a MEMS safety and arming device with a latching mechanism placed perpendicularly to the projectile axis has been proposed. The proposed device is more beneficial to increase the force area of mechanism and to reduce the energy loss of micro detonation. The motion of the latching mechanism under dual environmental forces is theoretically modeled, and the criteria of reliable latching are given. Furthermore, dynamic finite element simulations are carried out to study the motion characteristics under dual environmental forces. The rerults in simulations indicate that the latching mechanism can achieve latching reliably under the rotary speed of 7000-18000 rpm with no plastic deformation.