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On The Vibro-acoustical Operational Modal Analysis Of A Helicopter Cabin

机译：直升机机舱的声声操作模态分析

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This paper aims to present a modal decomposition formulation for a vibro-acoustical operational modal analysis (OMA). In literature many works can be found on this topic, but until now no attention has been focused on the analytical form of the cross-power spectra (CPs) between the system outputs when a fluid-structure coupling is present. In this work it is shown that the CPs modal decomposition depends on the choice of the references, i.e. acoustical or structural. At first it is theoretically pointed out that the CP formulation for the acoustical and structural case is formally identical if appropriately pre-processed. Then, this theoretical result is verified through the results of an extensive experimental testing on the helicopter EUROCOPTER EC-135. The CPs between the structural output velocities and the acoustical response of the microphone inside the helicopter cabin are considered as inputs of an OMA. In order to verify the effectiveness of the modal model so obtained a classical modal analysis is also performed. The acoustical reference choice reveals to be suitable for a vibro-acoustical OMA. It is highlighted, indeed, that the acoustical pressure measurement inside the enclosure can be used as reference instead of the commonly used structural sensors, both from the theoretical and practical point of view. This is useful for high scale structures where the structural responses are usually measured by means of moving sensor arrays and additional fixed reference sensors should be positioned on the surface.
机译：本文旨在为振动声工作模态分析（OMA）提供一种模态分解公式。在文献中可以找到许多有关该主题的著作，但是直到现在，当存在流固耦合时，系统输出之间的交叉功率谱（CP）的分析形式都没有引起关注。在这项工作中表明，CP的模态分解取决于参考的选择，即声学或结构。首先，从理论上指出，如果经过适当的预处理，用于声学和结构情况的CP配方在形式上是相同的。然后，通过在直升机EUROCOPTER EC-135上进行的广泛实验测试的结果，验证了该理论结果。结构输出速度和直升机机舱内麦克风的声学响应之间的CP被视为OMA的输入。为了验证模态模型的有效性，还进行了经典的模态分析。声学参考选择显示适用于振动声学OMA。实际上，需要强调的是，从理论和实践的角度来看，外壳内部的声压测量都可以代替常用的结构传感器作为参考。这对于通常通过移动传感器阵列测量结构响应并且应在表面上放置其他固定参考传感器的大型结构很有用。

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