High order sensitivity analysis of a mistuned blisk including intentional mistuning

• Autorzy: Pohle L. , Tatzko S. , Panning-von Scheidt L. , Wallaschek J.

Identyfikatory

DOI

10.15632/jtam-pl.55.1.353

• Języki publikacji: EN

Abstrakty

EN

Small deviations between turbine blades exist due to manufacturing tolerances or material inhomogeneities. This effect is called mistuning and usually causes increased vibration amplitudes and also a lower service life expectancy of bladed disks or so called blisks (bladed integrated disk). The major resulting problem is to estimate the maximum amplitude with respect to these deviations. Due to the probability distribution of these deviations, statistical methods are used to predict the maximum amplitude. State of the art is the Monte-Carlo simulation which is based on a high number of randomly re-arranged input parameters. The aim of this paper is to introduce a useful method to calculate the probability distribution of the maximum amplitude of a mistuned blisk with respect to the random input parameters. First, the applied reduction method is presented to initiate the sensitivity analysis. This reduction method enables the calculation of the frequency response function (FRF) of a Finite Element Model (FEM) in a reasonable calculation time. Based on the Taylor series approximation, the sensitivity of the vibration amplitude depending on normally distributed input parameters is calculated and therewith, it is possible to estimate the maximum amplitude. Calculating only a single frequency response function shows a good agreement with the results of over 1000 Monte-Carlo simulations.

Słowa kluczowe

EN

turbine blades; mistuning; sensitivity analysis

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2017
• Tom: Vol. 55 nr 1
• Strony: 353--368
• Opis fizyczny: Bibliogr. 31 poz., rys.,tab.

Twórcy

autor

Pohle L.

• Leibniz Universität Hannover, Institute of Dynamics and Vibration Research, Hannover, Germany

autor

Tatzko S.

• Leibniz Universität Hannover, Institute of Dynamics and Vibration Research, Hannover, Germany

autor

Panning-von Scheidt L.

• Leibniz Universität Hannover, Institute of Dynamics and Vibration Research, Hannover, Germany

autor

Wallaschek J.

• Leibniz Universität Hannover, Institute of Dynamics and Vibration Research, Hannover, Germany

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)