大形タービン発電機ロータの焼ばめ部品における非可逆的挙動の解明

概要

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The end-bells of a turbo alternator consist of an end-bell and a supporting ring. Their purpose is to hold together the coil ends emerging from the rotor body and to prevent them from shifting. During operation, an end-bell tends to spread outward due to centrifugal forces, and then slip or play develops at the seating. Furthermore, as the speed decreases, sticking occurs there. We discuss the contact mechanics of end-bell hysteresis behavior. First, it is shown experimentally that micro-slip can occur on shrink-fit surfaces during load cycles. Next, this contact behavior and micro slip are investigated using a 3-dimensional FEM. The numerical predictions of hysteresis-behavior agree well with experimental results. The stick-slip thresholds are functions of design parameters such as interference fit and friction coefficient. This technique can be used to improve the balance design of the rotors.
社団法人日本機械学会の論文
1997-03-25