1987-11-13

A Frequency Domain Mimo Modal Identification Method with Application in the Aircraft Ground Vibration Test 872458

This paper presents a frequency domain multi-input/multi-output (MIMO) identification method. The accuracy, reliability and ability of handling repeated modes are verified by computer simulation and practical structures. The applications in an aircraft Ground Vibration Test (GVT) is given. The results have shown that compared with traditional multipoint sine excitation phase resonance method, operation is simplified, testing time is reduced reliability is improved and compared with time domain MIMO methods developed over the past several years, the order of the system (the number of modes) can be identified directly so that the calculating time is reduced and the user's judgement of distinguishing between structural modes and noise modes is avoided.

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