Fusion stiffness modification of spring and fe modal in rod fasten rotor

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (11) : 53-56.

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Fusion stiffness modification of spring and fe modal in rod fasten rotor

Zhang Zi-yang1; Xie Shou-sheng1; Qian Zheng-wen1; Long Men2;Peng Jing-bo1

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Abstract

This paper presents a method to update the FE(finite element) modal of high pressure spool in aero engine. Having analyzed the mechanical modals which described the contacting surfaces between the wheel disks in rod fasten rotor, it remodeled the contacting surface of FE modal of high pressure spool. By using a fusion method which combines the modification of stiffness of the spring and FE modal together, it develops a total optimization modal for FE modal stiffness updating which concerns contacting surface. Furthermore, it employs the straighten algorithm to extract the parameters which need to be calibrated in the calculation of the optimization modal, and modifies them with modal parameters got by experimental modal analysis. Results of an experimental application of this fusion modification are given to illustrate that the modified FE modal truly represents the contacting state of high pressure spool.

Key words

finite element modal updating / contacting modal / target fusion / straighten algorithm / experimental modal analysis / rod fasten rotor

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Zhang Zi-yang;Xie Shou-sheng;Qian Zheng-wen;Long Men;Peng Jing-bo. Fusion stiffness modification of spring and fe modal in rod fasten rotor[J]. Journal of Vibration and Shock, 2011, 30(11): 53-56