基于动态特性分析的复进簧寿命预测  

Dynamic Analysis and Life Prediction of Strand-drive Spring for Gun

作　　者：刘森林 魏志芳[1] 刘伟[1] 栾成龙 程洋洋 LIU Senlin;WEI Zhifang;LIU Wei;LUAN Chenglong;CHENG Yangyang(School of Mechatronic Engineering, North University of China, Taiyuan 030051, Shanxi, China)

机构地区：[1]中北大学机电工程学院,山西太原030051

出　　处：《火炮发射与控制学报》2019年第1期1-6,共6页Journal of Gun Launch & Control

基　　金：国防基础科研项目(A1020131011)

摘　　要：多股复进簧是自动武器的关键部件,为提高复进簧设计水平,就必须深入研究多股复进簧动态特性与疲劳寿命预测。针对某航空机枪多股复进簧进行研究,采用ABAQUS进行有限元仿真、时域分析和应力谱分析,同时基于动态特性分析进行Miner理论工程计算和n Code数值仿真计算,分别对多股复进簧进行疲劳寿命预测。研究结果表明,后坐阶段复进簧固定端应力在18 ms达到最大值519. 4 MPa,复进阶段复进簧固定端在38 ms达到最大值705. 2 MPa,通过时域分析可知,复进簧固定端最有可能出现疲劳失效; n Code仿真中,复进簧复进后坐一次产生疲劳损伤最大值为5. 074×10-5,其最小循环次数为19 708次,与工程计算中50%可靠度下的预测值接近,符合一般试验情况。此方法对自动武器其他机构的疲劳分析具有指导意义,对其他类弹簧或火炮复进簧寿命研究也具有借鉴意义。Strand-drive spring is the key component of automatic weapon, so it is necessary to study the dynamic characteristics and fatigue life prediction of strand-drive spring in order to improve the design level of the composite spring. In this paper, the fatigue life prediction of multi-strand spring was carried out by using Abaqus for finite element simulation, time-domain analysis and stress spectrum analysis based on miner theory and numerical simulation of nCode. The research results show that the stress at the fixed end of the recoil stage of the complex spring reaches the maximum value of 519.4 MPa at 18 ms, and that the fixed end of the complex spring in the complex phase reaches the maximum 705.2 MPa at 38 ms. It is found that the fixed end of the compound spring has the most likelihood to have fatigue failure. In nCode simulation, the maximum fatigue damage is 5.074×10 ^-5 , with the minimum cycle being 19 708 times, which is close to engineering calculations in the 50% reliability of the predicted value. At the same time, this is in line with what happens in the general test. This method is instructive to the fatigue analysis of other mechanisms of automatic weapon, and it can be used as references for the study of the life of other kinds of spring or cannon.

关 键 词：多股复进簧 动态特性 寿命预测 工程计算 nCode 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]