Research On Key Technologies Of Short Interval Multiple Impact Test Equipment

During the development process of modem industrial and military technology,repeated impact loads are more than ever,such as the impact during drilling process,foundation strengthen process,soil and rock drill detecti process,the penetration impact process of multilayer hard target.The study on the structure response characteristics,structure safety and fatigue life under multiple impact has important economic value and military significance.Aiming at the representative form of repeated impact loads-multilayer hard target penetration process,a multiple impact experiment device is designed,using repeated impact to produce adjustable waveform,providing design reference for the design of simulation devices of various other repeated impact loads.In modern warfare,critical infrastructure command hub,multilayer fortifications,bridges and other important facilities are under the protect of complex solid structure whose strength is generally greater than 40MPa,impact acceleration of the penetration is over tens of thousands of G.A very high request to the performance and reliability of structure strength is put forward.At present,the test methods of the penetration fuze are mainly carried out by range test and laboratory test,and the reliability of range test is highly reliable,but range test cost quite a lot of time and money.It is urgent to establish a laboratory ass essment method for penetration fuze performance,the structural safety of fuze,the correctness of firing control strategy,and the transmission characteristics of missile-fuze interface can be verified in laboratory.The performance evaluation methods,of fuze,especially the assessment methods of multi impact equipment for multi layer penetration are lack,a low cost multi penetration experimental assessment methods are needed urgently.Based on the analysis of typical multi target penetration process,the key features of penetration into different target acceleration curves are extracted,aiming at these characteristics,an experimental system for dynamic assessment of penetration fuze is designed,the repeated impact process theory and simulation analysis are studied.The mechanical factors model of the clearance motion and kinematics effects were analyzed using simulation.Simulation waveforms are compared with actual penetration process waveforms,the key factors affecting the waveform characteristics are analyzed.The missile-fuze buffer model was studied using static compression and dynamic impact experiments of different types of buffer gaskets.The main research contents and innovations are as follows:The simulation method of multilayer penetration penetration is put forward,using high speed rotating turntable to produce multiple impacts in milliseconds,generating an acceleration signal with the characteristics of multi penetration acceleration signal information under the payload of 1.5kg.The maximum amplitude is 10000g,with the pulse width over 200?s,the number of contacts over6.A time sequence control method for millisecond motion is proposed.The starting and ending of the multiple impact process is realized by driving the measuring head(contained fuze)to enter and exit the collision zone by the hydraulic mechanism.The timing of the measuring head pushed in or out will cause incomplete contacts,leads to invalid signal.The timing of the measuring head pushed out of the collision zone determines whether the repeated impact number is accurate.Based on time window theory,the principle of hydraulic concession mechanism motion displacement is analysed.A hydraulic mechanism action timing control method of concessions is proposed.repeated impact process within 10ms can be precisely controlled in theory.The motion model of translation pair with friction clearance under multiple impact conditions is established.The theoretical modeling of the translational pair with clearances is carried out,the depth of penetration and the force acting on it are calculated.Through dynamics simulation,swing angle,acceleration and displacement of the motion process is solved under the condition of different gap changes.Finally,the actual motion process of multiple impact is extracted by image processing of high speed photography in the experimental process.The method of shock wave control for multiple impact process is proposed and experimentally verified.By adjusting the side collision characteristics,key parameters of multiple shock interval,acceleration waveform characteristics of the impact process is adjusted in order to meet with the characteristic of penetration typical target process acceleration.A penetration simulation device is designed and fabricated.detonating control strategy is tested during a multi-layer penetration process simulation using a certain type of penetration fuze.The repeated impact signal can be identified by the fuze,proving that the simulation experiment system can be used for dynamic penetration fuze detected in the laboratory.Penetration fuze impact test of short interval the multiple high impact experimental device has been applied to the state-owned 5124 factory,Beijing Institute of Technology and Research Institute of electronic engineering Chinese Academy of Engineering Physics related models,and the software control strategy for reliability verification of fuze software and hardware work,saving range test cost.