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1 Transactions of the Institute of Fluid-Flow Machinery

1 2016

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A combined numerical-experimental model of air foil bearing compliant structure

Łagodziński J., Zieliński P.

Transactions of the Institute of Fluid-Flow Machinery

2016

nr 133

117--129

The paper concerns the development process of numerical-experimental model of air foil bearing compliant structure. Theoretically, static and dynamic characteristics of the foil bearing are the result of elastic combined properties of the two serially connected elements. One of them is a thin gas ﬁlm of very small thickness and relatively high static and dynamic stiﬀness. The second elastic element is a pretensioned bump foil spring. This paper focuses on the properties of compliant foil structure and leaves aside the gas ﬁlm behavior. At the beginning of the model development, the global stiﬀness and damping properties of compliant structure were obtained from the test stand measurements. In the next step, some assumptions concerning the model were made. The main one was the replacememy of the single bumps of the corrugated foil by the set of elastic-damping numerical elements. At last, the ﬁne-tuning of the model was carried out. The tuning involved changing of subelements local damping and stiﬀness properties, which in eﬀect inﬂuenced the global properties of foil bearing. The tuning criterion for the model was deﬁned as follows: the bearing global stiﬀness and damping properties of the model should not diﬀer from the experimentally obtained values more than 10%.