某装药弹振动特性的安全分析

为分析某装药弹的振动特性,并为该弹提供必要的力学数据,建立某装药弹模态方程。采用ANSYS软件对该弹振动特性进行了数值模拟,利用Block Lanczos法求解,得到前10阶振动固有频率和振型。分析结果表明:低阶频率主要以摆动和转动为主,高阶频率主要以弯曲扭动为主,低阶频率对该弹的影响比较小,高阶频率对该弹的影响比较大,尤其是7～10阶频率,该弹的主振频率为1053.8 Hz,为该弹的优化设计提供科学依据,在加工、储存、运输和使用条件下应低于该频率;为验证该方法可信度,采用某小型装药弹进行了实验验证,实验结果和仿真结果偏差小于1%;同时证明该有限元数值分析的方法是经济可靠的。

Safety Analysis on the Vibration Characteristics of a Certain Bomb's Explosive Column

A mode equation for a bomb's explosive column was firstly built so as to analyze its vibration characteristics and provide essential mechanics data.Then,a numerical simulation on the vibration characteristics was conducted by using ANSYS software,and the former tenth vibration natural frequency and vibration mode of the bomb was obtained with Block-Lanczos method.Analysis on the results shows that the bomb will mainly rotates and swings in low frequency conditions and bends and twists in high frequency conditions;the low frequency only has a small impact on the bomb,while the high frequency,especially the seventh to tenth,has a great impact on the bomb.The main vibration frequency is 1 053.8 Hz,which provides scientific basis for the optimum design of the bomb's explosive column.Therefore,the frequency of the bomb in the process of producing,storing,transporting and using should be lower than 1 053.8 Hz.In order to verify the reliability of the method,an experiment was done on a mini-type Bomb's Explosive Column.The analysis shows that the result obtained by experiment only has a deviation of 1 percent with that obtained by simulation,which proves that the finite element numerical simulation method is economic and reliable.