IGTC-79 Prediction of Blade Vibration Stress in Centrifugal Compressors due to Engine Order Excitation(Session D-4 VIBRATION II)
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概要
- 論文の詳細を見る
An empirical method for blade vibration during centrifugal compressor operation is presented. It allows to predict blade vibration amplitudes of various impeller and blade types, which are excited during operation by multiple of the shaft rotation frequencies, the so-called engine-orders. This excitation cause originates from a peripheral flow non-uniformity in the compressor mainly from the outlet zone and represents one of the most important causes for blade failures. The presented method uses the gas load on the impeller blade at design operation as a reference. The displacement of the blade and the resulting stress due to this static load represents a measure for the sensitivity of any blade type to an excitation. Experimental data of blade vibration measurements can now be given as an equivalence to a multiple of this static load stress. The resulting multiplication factor represents a useful device in the stress design process, which enables thus the prediction of blade vibration amplitudes of other impellers during resonance excitation. The application of this method is demonstrated on two different centrifugal impeller types (60° and 9° ended blades and same diameter D_2 ; see Fig. 1) by blade vibration measurements during compressor operation using strain gage data telemetered from the rotating shaft. Predicting blade resonance amplitudes already in the design procedure may generally allow in the future to do a major step forwards to a reduction of blade thickness of highly loaded centrifugal compressor impellers.
- 社団法人日本ガスタービン学会の論文
著者
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Haupt U.
Institute of Turbomachinery, University of Hannover
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Rautenberg M.
Institute of Turbomachinery, University of Hannover
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Haupt U.
Institute Of Turbomachinery University Of Hannover
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Haupt U.
Institute For Turbomachinery University Of Hannover
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Rautenberg M.
Institute Of Turbomachinery University Of Hannover
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Rautenberg M.
Institut For Turbomachinery University Of Hannover
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Jin D.
Institute of Turbomachinery, University of Hannover
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