Research On Test And Evaluation Method Of Recoilless Rifle System Related Performance

The recoilless rifle system is the team fire support weapon that every country pays attention to at present.Therefore,it is of great theoretical significance and engineering application value to carry out the research on the test and evaluation methods of some key technical performance involved in the light recoilless rifle system.This paper focuses on the test and evaluation of the important technical performance of the recoilless rifle system,such as the complex back-ejection danger zone,dynamic unbalance impulse,firing torsion,striking accuracy,power,etc.The experimental test and theoretical analysis are combined to study.The main research contents and results are as follows:(1)Aiming at the test requirements of typical performance parameters(shock wave,heat flow,gas jet impulse,dynamic imbalance,torsional moment,fragment velocity and distribution)involved in the recoilless rifle system,the corresponding test systems are established respectively,and the system composition and equipment model are introduced in detail.It provides an effective test method guarantee for the test and evaluation of the important technical performance of the recoilless rifle system.(2)A comprehensive risk assessment method of recoilless rifle is established.Based on the analysis results of hazard sources in the danger area,the experimental research is carried out.Combined with the probability unit model,the injury type and injury probability of personnel in the danger area under the action of different hazard sources were evaluated,and the main lethal factors were determined.The research shows that the test and evaluation method can intuitively evaluate the risk of back-ejection danger zone,and can provide the basis for determining the risk area of light recoilless rifle and its similar weapons,and provide scientific guidance for the use performance.(3)A synchronous test system of dynamic unbalance impulse and launching torque impulse is designed to realize the accurate measurement of dynamic unbalance impulse.Combined with the theory of motion stability of vibration system,the dynamic unbalance problem of light recoilless rifle is studied in detail.The research shows that the recoilless rifle system has a period after the aftereffect period,which has an important influence on the dynamic imbalance design.This method is helpful to understand the influence mechanism of residual propellant gas on the dynamic imbalance of the launcher in period after the aftereffect period.(4)Aiming at the problem of launch torsion of recoilless rifle.In this paper,based on the force analysis of rifling,an analysis model of torsional characteristics is established,and the analysis model is verified by design experiments.The results show that the calculation results of torsional moment impulse are in good agreement with the test results,and the error is about 3%;in the free state,the calculation results of projectile rotational angular velocity and launcher rotational angular velocity are also in good agreement with the test results,and the error is 4.156% and-1.312% respectively.In addition,through the model,the quantitative relationship between the equivalent firing angle and the actual processing angle can be obtained,which provides the necessary initial parameters for the time fuze.(5)Based on the theory of exterior ballistics and Monte Carlo method,the air burst accuracy is simulated,and an equivalent winding distance calibration technique for the recoilless rifle is proposed.It provides an important reference for improving the accuracy of air blast distance determination of individual grenade,and is verified by experiments.In addition,combined with the law of coordinate damage,the operational effectiveness of individual-soldier air burst grenade is simulated.It is found that when the target distribution is unknown,the effectiveness can be increased by more than two times by selecting the fuze timing accuracy and properly increasing the fragment dispersion angle.(6)The experimental study of fragment power is carried out and the program of fragment power evaluation is compiled.Based on the high-speed video recording method,the fragment velocity and fragment dispersion characteristics were tested.Based on the50% fragment penetration rate,the equivalent steel target with effective strength wearing secondary protective equipment was tested.Combined with the theoretical model,the fragment power evaluation program was developed,and the fragment damage power of grenade equivalent cylindrical warhead of recoilless rifle system was evaluated.The results show that the test results based on high-speed video recording are more scientific,and the fragment power evaluation program can quickly evaluate the fragment damage power of warhead combined with test data.(7)Aiming at the attenuation of shock wave power on plateau,an effective prediction method of shock wave parameters at different altitudes is established.Compared with the test results of plain and plateau,the calculation results of the prediction model are in good agreement with the test results,and the method can better predict the shock wave parameters at different altitudes.With the help of the established prediction method and the probability unit model,the damage probability of the explosion shock wave of grenade simulation projectile of the recoilless rifle system to personnel and buildings with brick and tile structure is evaluated.The results show that: with the increase of altitude,the damage probability of shock wave to the target decreases,and with the increase of blast center distance,the influence of altitude is gradually intensified.