摘要
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。
Aimed at the affect of the gun barrel vibration characteristics shooting accuracy and intensity, as well as inherent relationship of elastic modulus and frequency, the finite element method （FEM） is used for modal analysis. Two paths are planed in order to study the deformation of barrel under the natural frequencies, i.e. both the axial and circum- ferential paths. Then the finite element dynamic intensity analysis result is mapped to the two paths, and read the data from the two paths. Through the study on impact of each mode on shooting accuracy, a method is got to improve shooting accuracy. With the study of the relationship between elastic modulus and frequency, how to improve firing stability in safety spectrum is discussed. The resuhs provided the reference meaning for reasonally aroiding the resonance frequency in dynamic strehgth design of the barrel and the muzzle device, and for barrel experimental modal analysis, too.
出处
《机械设计与研究》
CSCD
北大核心
2013年第3期126-130,共5页
Machine Design And Research
关键词
模态分析
振型
射击稳定性
安全频谱
弹性模量
modal analysis
mode shape
firing stability
safe frequency spectrum
modulus of elasticity
