A New Rotating Blade-Casing Rubbing Model Considering Flexibility of Casing

doi:10.12068/j.issn.1005-3026.2018.08.016

Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (8): 1143-1148.DOI: 10.12068/j.issn.1005-3026.2018.08.016

• Mechanical Engineering • Previous Articles Next Articles

A New Rotating Blade-Casing Rubbing Model Considering Flexibility of Casing

LI Bing-qiang¹， MA Hui¹， HAO Yu-ming²， XIE Fang-tao¹

1. School of Mechanical Engineering & Automation， Northeastern University， Shenyang 110819， China; 2. Shenyang Blower Works Group Corporation， Shenyang 110869， China.

Received:2017-04-05 Revised:2017-04-05 Online:2018-08-15 Published:2018-09-12
Contact: MA Hui
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Abstract

Abstract: Aiming at rubbing fault between rotating blade and casing， and taking elastic blade and flexible casing as studying objects， a new rotating blade-casing rub impact model was deduced based on elastic compatibility condition. Then considering centrifugal stiffening， rotating softening and rubbing softening， the quasi-static bending displacement of blade was calculated based on relevant theory of material mechanics. The casing was simulated as an elastic ring with spring support， and the displacement was composed of rigid-body and local-flexible displacements. The displacement equation of the flexible ring was established according to the principle of energy conservation， and the structural stiffness followed by local flexible displacement of the casing was obtained by discrete processing. Because of more parameters considered， the model has a good generality. Compared with the experimental data and the literature， the model can meet the requirements of calculation with a higher accuracy.

Key words: rotating blade, flexible casing, equivalent stiffness, rub-impact, rubbing model

CLC Number:

TH113

LI Bing-qiang， MA Hui， HAO Yu-ming， XIE Fang-tao. A New Rotating Blade-Casing Rubbing Model Considering Flexibility of Casing[J]. Journal of Northeastern University Natural Science, 2018, 39(8): 1143-1148.

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A New Rotating Blade-Casing Rubbing Model Considering Flexibility of Casing

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