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针对火炮身管振动特性对射击精度、密集度和身管可靠性造成的影响,以及弹性模量与频率的内在关系,采用有限元(FEM)模态分析方法对此进行了研究。为了研究对比身管各阶频率下的形变情况,规划两条路径,即轴向和周向路径,然后把有限元动强度分析结果映射到两条路径上,再读取两条路径上的数据。通过对各阶振型对火炮射击精度和密集度造成的不同影响进行研究,分析了提高射击精度的方法并通过模态试验和计算验证了对身管模态的分析结论;通过研究弹性模量与频率的关系,探讨了如何在安全频谱内提高射击稳定性。分析结果对身管和炮口装置动强度设计中合理规避共振频率以及身管试验模态分析具有参考意义。
Aiming at the influence of gun barrel vibration characteristics on shot accuracy, intensity and barrel reliability, and the inherent relationship between elastic modulus and frequency, this paper studied the FEM modal analysis method. In order to study the deformation under different frequencies of the barrel, two paths are planned, ie, the axial and circumferential paths. Then the dynamic strength of the finite element is mapped to two paths and then the data of the two paths are read . Through the study of the different effects caused by each mode of vibration on shooting precision and intensity of artillery, the methods of improving shooting accuracy are analyzed and the conclusion of the analysis of the mode of barrel is verified by modal tests and calculations. By studying the effects of elastic modulus And frequency, explored how to improve shooting stability in the safety spectrum. The results of the analysis are of reference significance to reasonable avoidance of resonance frequency and modal analysis of barrel test in dynamic strength design of barrel and muzzle device.