Uncertainty quantification of cylindrical test through Wiener chaos with basis adaptation and projection
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摘要:
由于炸药爆轰现象的复杂性和人们对它的认知缺陷,其表征爆轰流体力学过程的物理数学模型具有较强的不确定性,要降低基于爆轰建模与模拟的数值结果做出决策的风险,量化和评估不确定输入对爆轰系统输出结果的影响尤为重要。本文中针对具有高维随机变量的爆轰问题的不确定度量化,使用自适应基函数的Wiener混沌方法、耦合旋转变换和投影方法,减少截断空间的长度。针对输入变量相关性,使用Rosenblatt变换使其相互独立。针对不符合标准正态分布的变量使用等概率原则,将它化为标准正态分布。最后,使用自主研发的具有完全知识产权的爆轰数值模拟软件LAD2D, 研究了具有高维不确定参数的圆筒实验的不确定度量化,给出期望、标准差、置信区间等统计信息,所得问题与实验数据比对,从而确认了模型的有效性。
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关键词:
- 圆筒模型 /
- 不确定度量化 /
- 自适应基函数 /
- JWL状态方程 /
- Rosenblatt变换
Abstract:The mathematical-physical model used to describe the detonation dynamics has many uncertain factors due to the complexity and lack of knowledge for detonation phenomenon. Quantifying and assessing the impact of input uncertainties on output of detonation systems has a direct influence on reducing the risk based on the numerical model and simulation results for detonation. The Wiener chaos based on adapted basis is used to deal with the uncertainty quantification of high-dimensional random variables for detonation simulation. The rotation transformation and projection method is used to reduce the length of truncation number. Rosenblatt transformation is used to transform the set of dependent random variables into independent random variables. The equality of probability principle is used to change the non-Gaussian random variables into standard random variables. Uncertainty quantifications of the cylinder test with high dimensional input uncertainties are studied. The statistical informations such as mean, standard deviations, and confidence intervals are presented. The simulation results coincide with the experimental data, and the accuracy of the model is validated.
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Key words:
- cylinder test /
- uncertainty quantification /
- adapted basis /
- JWL EOS /
- Rosenblatt transform
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1. 三点起爆爆轰波传播及相互作用过程
1.1 装药结构及计算模型
1.2 数值模拟与试验对比
1.3 三点起爆爆轰波作用过程分析
1.4 马赫参数计算及验证
2. 三点起爆形成尾翼EFP数值模拟
2.1 不同起爆直径下尾翼EFP成型
2.2 不同起爆直径下尾翼EFP形成过程理论分析
3. 同步误差对尾翼EFP成型性能的影响
3.1 计算方案设计
3.2 同步误差对EFP尾翼成型的影响
3.3 同步误差对EFP飞行速度影响
4. 结论
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表 1 爆轰流体力学中的不确定度来源
Table 1. Sources of uncertainty in detonation hydrodynamics
符号 不确定度 描述 概率分布 ξ1 nb 可调参数 nb\simfont~B[αnb,βnb,anb,bnb] ξ2 rb 可调参数 rb\simfont~B[αrb,βrb,arb,brb] ξ3 R1 JWL EOS系数 R1\simfont~B[αR1,βR1,aR1,bR1] ξ4 R2 JWL EOS系数 R2\simfont~B[αR2,βR2,aR2,bR2] ξ5 ω JWL EOS系数 ω\simfont~B[αω,βω,aω,bω] ξ6 aNR N-R人为黏性系数 aNR\simfont~B[αaNR,βaNR,aaNR,baNR] ξ7 aL Landshoff人为黏性系数 aL\simfont~B[αaL,βaL,aaL,baL] ξ8 γ Gruneissen系数 γ\simfont~B[αγ,βγ,aγ,bγ] ξ9 σ 体积起爆阈值 σ\simfont~B[ασ,βσ,aσ,bσ] ξ10 ρ TNT初始密度 N(μρ, σ2ρ) ξ11 tb 起爆时间 tb\simfont~B[αtb,βtb,atb,btb] -
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