Abstract
mounted sensors was applied to carry out a complete acoustic radial mode decomposition at high frequencies. In this case, Radial Mode Analysis (RMA) is in particular challenging due to the { compared to ducts of larger hub-to-tip ratios { large radial mode content. In this paper it will be shown that with the help of a regularization technique RMA results of high accuracy can be achieved with a minimized number of measurement positions. Further, the acquired test data will be used to verify that a partial RMA is feasible, which delivers the amplitudes of the dominant radial modes using the input of only a few seconds sound pressure measurements at a small number of sensor positions. In that way, i.e. the partial RMA enables an online-monitoring of the rotor-stator interaction modes. An application of the partial RMA technique is of high interest to monitor the active control of individual radial modes and respectively the assessment of the tonal sound power e.g. during fan rig accels or decels.
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