Exploration and verification of unsteady aerodynamic load field fusion modeling method
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摘要:
飞行器虚拟飞行试验涉及气动、结构等众多高精度学科模型的多物理场仿真,准确快速的非定常气动载荷场计算是其关键制约因素。目前基于计算流体力学的非定常气动力计算成本十分昂贵,为了提升高精度非定常气动载荷场的计算效率并保证计算精度,基于Co-Kriging模型和POD场量降阶,提出一种基于多源数据融合的高效非定常气动载荷场预测方法。以4%厚度圆弧翼为测试对象,通过综合当地活塞理论计算得到的低精度载荷数据和计算流体动力学得到的高精度仿真数据构建非定常气动载荷场,分析了不同飞行工况下非定常气动载荷和颤振边界,结果表明:提出的基于数据融合的非定常气动载荷场预测方法,在内插时表面载荷预测精度不低于99.41%,在外插时表面载荷预测精度不低于83.32%,颤振分析结果误差不超过0.637%,计算效率提升了285.89倍。
Abstract:The virtual flight test of aircraft involves multi-physical field simulation of many high-precision discipline models such as aerodynamics and structure. Accurate and fast unsteady aerodynamic load field calculation is the key constraint. At present, the calculation cost of unsteady aerodynamics based on computational fluid dynamics is very expensive. In order to improve the calculation efficiency of high-precision unsteady aerodynamic load field and ensure the calculation accuracy, an efficient unsteady aerodynamic load field prediction method based on multi-source data fusion with Co-Kriging model and POD field reduction was proposed. Taking the 4% thickness arc wing as the test object, the unsteady aerodynamic load field was constructed by integrating the low-precision load data calculated by the local flow piston theory and the high-precision simulation data obtained by computational fluid dynamics. The unsteady aerodynamic load and flutter boundary under different flight conditions were analyzed. The results showed that the proposed unsteady aerodynamic load field prediction method based on data fusion had a surface load prediction accuracy of no less than 99.41% in case of interpolation, a surface load prediction accuracy of no less than 83.32% in case of extrapolation, and a flutter analysis result error of no more than 0.637%. The computational efficiency was improved by 285.89 times.
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Key words:
- data fusion /
- Co-Kriging model /
- reduced order model /
- virtual flight test /
- unsteady aerodynamic /
- flutter
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表 1 不同阶数高低精度数据重构误差
Table 1. Reconstruction error of high and low precision data of different orders
阶数 重构类型 方均根误差 最大相对误差/% 前5阶 高精度数据 46.7551 1.08 低精度数据 67.5477 2.14 前6阶 高精度数据 11.0356 0.56 低精度数据 61.4382 2.08 前10阶 高精度数据 11.0093 0.31 低精度数据 54.5775 2.08 表 2 预测模型和当地活塞理论升阻力系数预测误差
Table 2. Prediction model and local piston theory lift drag coefficient prediction error
模型 升力系数预测
误差/10−8阻力系数预测
误差/10−10融合模型 1.2064 2.1893 当地活塞理论 82.906 4.0217 表 3 平动条件下融合模型内插和当地活塞理论升阻力系数预测误差
Table 3. Prediction model internal interpolation and local piston theory lift drag coefficient prediction error under translational conditions
模型 升力系数预测
误差/10−4阻力系数预测
误差/10−5融合模型 3.7999 4.8674 当地活塞理论 24.012 33.112 表 4 平动条件下融合模型外插和当地活塞理论升阻力系数预测误差
Table 4. Prediction model extrapolation interpolation and local piston theory lift drag coefficient prediction error under translational conditions
模型 升力系数预测
误差/10−4阻力系数预测
误差/10−5融合模型 3.4583 5.5291 当地活塞理论 7.9865 11.478 -
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