| A kind of missile inertia igniters is pure mechanical ignition device which is applied to low overload, long duration environment. In order to provide a reference for the design optimization of inertia igniter, the four technologies involved were studied by using theory and simulation method.In order to identify accurately the environment with low overload, long action time, so as to realize design optimization, the working process of firing pin ignition device safed by safe ball and its associated clock mechanism was analyzed by the theory of rigid body dynamics, so that the related mathematical model and extreme of clockwork time was got. Reducing distribution of firing pin spring resistance and torsional spring torque, replacing stainless steel safe ball for Si3N4ceramic safe ball can effectively reduce the influence for clockwork time accuracy. In guarantee firing reliability, reducing firing pin spring force, i006Ecreasing torsional spring torque and replacing bearing steel ball for Si3N4ceramics safe ball can make the ignition device reliability improved.To reveal the influence of centrifugal environment on the clockwork working characteristic, so as to optimize the experimental design, the clockwork working process simulation model was established by ADAMS software, clockwork travel-time curves in centrifugal environment were got. The larger centrifugal overload is, the longer clockwork time is. Increasing centrifugal radius can make clockwork time closer both in the centrifugal environment and in the setback environment if centrifugal overload is constant. For a particular design scheme, the centrifugal critical overload is21g in which clockwork fail to arm when centrifugal radius is1m.In order to guarantee the ignition device in integrity and safety condition when it dropped from credible height, the impact response characteristics of the exposed interface structure and sensitive setback inertial device of inertial ignition were analysied by ANSYS/LS-DYNA software and ADAMS software, rear body interface section stress and inertia spring resistance varying curve with time were got for different dropping targets.If the ignition device with super-duralumin alloy drop on hard wooden boards, which exposed interface structure will have no obvious deformation, and can guarantee the normal assembly. But when dropping on other hard targets, it will have obvious deformation and can’t assembly. When sensitive setback inertial device drop on different targets, the inertia and the base plane of the body only has a collision, and the window time generated by the drop impact for the release of the clock is far less than clockwork’s arming time, after the coasting body under the action of inertia spring reset again, the sensitive setback inertial device can guarantee drop safety and structure correctness.In order to improve the safety of inertia ignition, the design problems for insensitive explosive partition board initiator were studied by ANSYS/LS-DYNA software, and the shock wave pressure curves and pressure peaks were got. The thicker partition or air gap is, the faster shock wave attenuation is. The diaphragm materials ranged according to the attenuation rate from high to low are7A04,2A12, H62, HPb59-1,35CrMnSi and40CrNiMoA. Both the acceptor charge is reliably initiated and partition is perfect, the more donor charge quantity is, the minimum thicker plate is. Therefore, the partition board initiator materials should optimize steel such as stainless steel40CrNiMoA. |
PDF Full Text Request