Abstract
A new modal testing method, termed complex modal testing, is proposed for modal parameter identification of rotating machinery and compared with the classical method. The proposed method is essentially based on the use of complex notation which has been known to be a powerful mathematical tool in the analysis of, particularly isotropic, rotor systems. Complex modal testing not only allows clear physical insight into the backward and forward modes, but also enables the separation of those modes in the frequency domain so that effective modal parameter identification is possible. In addition, it does not require additional testing effort to obtain the adjoint mode shapes of isotropic rotors which are characterised by non-self-adjointness.
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