Method for projectile velocity testing of small caliber guns based on barrel strain

DOI:	10.11809/bqzbgcxb2024.08.034
Keywords:	projectile velocity; small caliber guns; barrel; strain test;projectile bottom pressure
Abstract:	In response to the difficulties in obtaining the entire velocity curve, susceptibility to environmental influences, bulky size, high cost, and complex operation with traditional methods of projectile velocity testing for guns, a method based on barrel strain for measuring the projectile velocity within small caliber guns was proposed. A strain tester was designed for a 30 mm caliber gun to conduct strain tests on the outer wall of the barrel. The chamber pressure curve was calculated based on the thick walled cylinder theory. The projectile bottom pressure curve was obtained through a projectile bottom pressure solving model, which was compared with the curve obtained from projectile bottom pressure storage testing method. Combining the equations of projectile motion, the projectile velocity curve was determined. The fourth order Runge Kutta algorithm was used to establish a projectile velocity simulation model. The projectile velocity curves obtained from strain test and projectile bottom pressure storage testing were compared with the simulated curves. The results show that the trends of the velocity curves obtained from strain test, projectile bottom pressure storage testing, and simulation are largely consistent, with maximum velocity errors of 1.1% and 0.5%, respectively. The feasibility of the strain test method is verified, which opens up a new way for projectile velocity testing of small caliber guns.
Issue:	Vol. 45 No. 8 (2024)
Published:	2024-09-02
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