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Zeroth-order flutter prediction for cantilevered plates in supersonic flow

机译:超音速流中悬臂板的零阶颤振预测

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摘要

An aeroelastic prediction framework in MATLAB with modularity in the quasi-steady aerodynamic methodology isdeveloped. Local piston theory (LPT) is integrated with quasi-steady methods including shock-expansion theory andthe Supersonic Hypersonic Arbitrary Body Program (SHABP) as a computationally inexpensive aerodynamic solver.Structural analysis is performed using bilinear Mindlin-Reissner quadrilateral plate elements. Strong coupling of thefull-order system and linearization of the modal-order system are implemented. The methodology is validated againstpublished experimental data in literature and benchmarked against Euler computation in the Edge CFD code. Theflutter dynamic pressure is predicted to within 10% of the experimental value for 140 times lower computational costcompared to CFD. Good agreement in other cases is obtained with the industry-standard ZONA7 and ZONA7U codes.
机译:在准稳态空气动力学方法中建立了模块化的MATLAB气动弹性预测框架。局部活塞理论(LPT)与包括冲击扩展理论和超音速高超音速任意体程序(SHABP)在内的准稳态方法相结合,是一种计算成本低廉的空气动力学求解器。结构分析使用双线性Mindlin-Reissner四边形板单元进行。实现了全阶系统的强耦合和模态系统的线性化。该方法针对文献中已发表的实验数据进行了验证,并针对Edge CFD代码中的Euler计算进行了基准测试。与CFD相比,其颤动动压力预计在实验值的10%以内,计算成本降低了140倍。在其他情况下,可以使用行业标准的ZONA7和ZONA7U代码达成良好的协议。

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