<p>Sector-to-sector geometry or material property variations in bladed disks, or blisks, can result in significantly greater vibration responses during operation. Though nominally cyclic symmetric, the dynamics of as-manufactured blisks are sensitive to these unavoidable deviations, known as mistuning, making the identification of mistuning in as-manufactured blisks necessary for accurately predicting their vibration. As in previous mistuning modeling and identification approaches, the mistuning of interest here is considered small and it is parameterized by using deviations in cantilever blade-alone frequencies. Such mistuning parameterization is popular because it can be applied through blade-to-blade stiffness deviations in computational reduced-order models used to predict blisk dynamics. Previous approaches to identify these mistuning parameters often require the identification of modal information or blade-isolation techniques such blade detuning using masses or adding damping pads to measure mistuning. However, modal information can be difficult to obtain accurately even in ideal bench conditions. Additionally, in practice it can be difficult to isolate individual blades by restricting blade motion around the blisk or detuning individual blades through added masses due to geometric constraints. In this paper, we present a method for mistuning prediction using a data-driven approach based on a neural network. The network is first trained using surrogate computational data. Thus, the data-driven portion of the approach is executed using surrogate computational methods. With the trained network, mistuning in all sectors of blisks with the same nominal geometry can be identified by using a small number of forced responses and the forcing phase information from traveling-wave excitation. In this approach, no system or sector-level modal response information, restrictive blade isolation, or mass detuning are required. We additionally present a method for forcing frequency selection and response conditioning to improve identification accuracy. Validation of this approach is presented using a finite element blisk model containing stiffness mistuning within the blades to create computationally generated surrogate data. It is shown that mistuning can be predicted accurately using forced responses containing a significant amount of absolute and relative measurement noise, mimicking responses collected from experimental measurements. In addition, it is shown that mistuning can be independently and accurately predicted using different engine orders of excitation in regions of high modal density.</p>

Data-Driven Approach for Identifying Mistuning in As-Manufactured Blisks

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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