The Key Technique Research Of Dispenser Fuze Safety System For Rocket-cluster Bomb Of Super Short-range Active Defence System

The super short-range active defence system is a new weapon systemwhich is used for guarding the important fixed military targets. It is layered to intercept incoming precision-guided weapons, and make up the shortage of existing weaponryof intercepting the super short-range, high-speed flight targets at low altitude. And it is formed as a complete defensive zone. The first layer of multi-mounted rocket-cluster bomb system is a low-cost fire system. Its core technology is the optimal spatial spreading control technology. It forms a complete continuous defense region with the second lower layer fire defense system, witch will fill a blank of unprotected area in super short-range. Facing the necessity and urgency of developing super short-range active defense system. In order to reduce the risk of future model developing, the key technology of dispenser fuze safety system for rocket-cluster bombis carried out. It is focused on solving the core issues of fuze safety system, to ensure the future system development smoothly. Therefore, this thesis is based on military needs of the super short-range active defence system, to research the key technology of dispenser fuze safety system for rocket-cluster bomb. It has important military significance on anti-precision guided weapons.Firstly, the time sequence and structure of dispenser fuze safety system are analyzed, and the limit indexes of arming safe distance, chamber-opening point and delayed arming distance are defined, to solve the key quistions of less environment of redundancy arming and difficult controling dispenser fuze opening action time for super short-range active defence system. Then, based on the method of bullet cluster center hitting the target, optimal chamber-opening time with the best shooting angle is calculated respectively for fixed and various launching occasions. The chamber-opening time is derived out under the best fire condition, which provides the basis for the determination of the delayed arming time. So, the scheme of the dispenser fuze safety system which is combined with inertia braking setback safety device and gas power delayed arming device are developed.Considering the basis of service process security, action reliability and arming sensitivity, the influence of friction coefficient on the compound inertia braking setback safety device are analyzed. The model of the compound inertia braking setback safety device is build up. The calculation of 2D numerical formula and 3D simulation model showed its dynamic characteristics. It is security in normal condition and will be armed during launch process. The result of simulation, static test and fire test showed that the compound inertia braking setback safety device has safety and mechanical advantages compared to traditional setback safety device.The combustion pressure of rocket engine has a sharp raise character. Another safety technology is introduced for rocket fuze. A gas power delayed arming device, it reduced the thrust and impact of combustion gas on piston at start moment and improved the stability of switch operation. The electronic delay circuit, power connection, and short circuits of explosive device are combined with gas switch. One moving part, the piston is design with multifunction to open or close certain portion of circuits at start moment of rocket launch, so the safety device is feasible timing, universal and compact. Two buffer chambers reduce gas pressure then stabilized the impulse on piston. A cut off pin locks the piston, whose strength is chosen to distinguish the gas impact between service process and launch. The arming device has no preload parts, no battery. It is suit for long term storage.Appling N-S formula and k-ε model, gas dynamic simulation is carried out based on a rocket engine pressure curve. The process of combustion gas injects in buffer chamber, pressure drop and distribution of two chambers are calculated. So the start moment and condition of piston are predicted. The simulation and close vessel test show the arming device starts up rapidly on wide range of combustion pressure, the piston moves stably and all switches operate reliably without shake.In the case of short-range, to control delayed arming distance and the timing starting point of the parent bomb fuze security system effectively, muzzle induction loading method and programmable timing circuit are adopted to set the arming and fire time. The muzzle induction loading device, digital timing circuit and gas power arming switch are combined as a programmable timing fuze for parent bomb, which controls fuze power on, delayed arming and fire time in real time. As a multifunction, dispersed fuze, the single point and series-parallel hybrid grounding method are introduced to improve anti-interference performance.The launch test of muzzle electromagnetic induction loading and delayed arming have been carried out. The result shows that the chamber-opening time is correct and arming operation is reliably.the gas power arming switch is sealed well and the safety pin is cut off reliably, the action of power switch and short circuit switch are correct and their contacts are stable and reliable. The performance of achieving precisely chamber-opening action is verified by recovery test. Recovered projectile shows accurate input and output of loading data, arming and chamber-opening operation.