Abstract
Traditional balancing techniques require at least two test runs, using trial weights, to enable a machine’s state of unbalance to be calculated [1]. In addition, accurate models of the flexible support structure found in many systems must be available for monitoring and analysis purposes, which is seldom the case due to their complicated physical nature. Numerical modelling techniques do not deliver acceptable results and so direct estimation of the structure from measured response data has generally been accepted as the most promising technique [2]. In this article it is shown how it is possible to estimate both the state of unbalance and a model of the flexible support structure of a rotor-bearingsfoundation system from a single set of vibration response data. This has obvious practical advantages for the efficient operation of rotating machinery – engineers in the field will be able to perform balancing in a much more cost-effective manner.
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