An inverse low-boom design method using a reversed equivalent area A e , r based on off-body pressure distributions is effective because this method captures three-dimensional effects in a flowfield. In this paper, a robust low-boom design method using A e , r is proposed to consider off-track sonic boom loudness. Computing costs are reduced by applying multipole analysis, which allows the capture of three-dimensional effects, even when an off-body location is close to a body. In terms of robustness, it is difficult to set feasible target A e , r distributions in a whole boom carpet. Unfeasible targets may lead to results contrary to the design intent. Thus, the target is imposed only on the undertrack A e , r distribution. In addition, second derivatives of A e , r having direct relation to the F function are controlled in the whole boom carpet. As a result, second derivatives are successfully controlled as intended by free-form deformation and genetic-algorithm-based optimization. The undertrack A e , r meets the target with acceptable deviation as well. As compared with the undertrack low-boom design, the robust design reduces the maximum perceived level in the whole boom carpet by 1.5 dB.


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    Title :

    Robust Low-Boom Design Based on Near-Field Pressure Signature in Whole Boom Carpet


    Contributors:

    Published in:

    Journal of Aircraft ; 54 , 3 ; 918-925


    Publication date :

    2017-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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