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弹体硬目标侵彻数值模拟数值噪声发生机理及抑制方法研究
Occurring mechanism and restraining method research of numerical noise signal in penetration simulation
【机构】 北京理工大学机电学院;
【摘要】 在高速弹体硬目标侵彻过程中,弹体内部的结构响应既与其自身的结构特征及目标靶体的材料和结构特征相关,所选取的计算方式对提取的侵彻阻力数据及弹体过载数据亦有相当的影响。侵彻数值噪声信号,是由于接触搜索算法自身固有的局限性,以及靶体成坑区域网格大规模周期性侵蚀这一特殊现象,而在侵彻阻力信号及弹体过载信号中引入的真实世界不存在的数值振荡。Burg谱分析结果显示提取的侵彻阻力信号中,除表征刚体阻力的低频冲击外,有与靶板网格尺度及着靶速度直接相关的高频噪声信号。在固定靶体网格形态等诸元的条件下,其频率特征基本与着速呈正比例关系。伴随着靶板厚度方向上网格的加密,侵彻阻力幅值及曲线形态、峰值过载,以及弹体余速均趋向于某一定值,且弹体余速先于侵彻阻力幅值及峰值过载发生收敛。
【Abstract】 In the penetration process of target body, the structural response inside the projectile is related to the structural features and material of target. In addition, the selected mode of calculation(theoretical analysis, numerical simulation, penetration expertment) will also have a considerable influence on the extractived data. Penetration numerical noise signal is an inexistence numerical oscillating signal in real world, which is introduced in the penetration resistance signal and the projectile overloading signal, because of the inherent limitation of the contact searching algorithm and the special erosion phenomenon in massive target cratering region periodic unit. Burg spectral analysis results show that in the extracted penetration resistance signal, besides the low frequency shock which represents rigid body resistance, there is a high frequency noise signal directly related to the scale of target grids. As the encryption of grids on the target thickness, the penetration resistance amplitude, curve shape, the peak value overloading and the leaving velocity of the projectile are all tend to a fixed value and the leaving velocity of the projectile converges sooner than the penetration resistance amplitude,curve shape, the peak value overloading in the simulation which studies the projectile overloading as the main researching object.
【Key words】 Hard target penetration; Numerical simulation; Signal of numerical noise; Burg spectral analysis; RADIOSS;
- 【会议录名称】 2015Altair技术大会论文集
- 【会议名称】2015Altair技术大会
- 【会议时间】2015-09-08
- 【会议地点】中国北京
- 【分类号】TJ410
- 【主办单位】澳汰尔工程软件(上海)有限公司(Altair Engineering,Inc.)