Acoustic excitation response and fatigue life analysis and test verification of thin-walled structure under high temperature environment

被引：0
|
作者：
Luan X. [1 ]
Hu Y. [1 ]
Sha Y. [1 ]
Jiang J. [2 ]
机构：
[1] Key Laboratory of Advanced Measurement and Test Technique for Aviation Propulsion System, Institute of Aircraft Engine, Shenyang Aerospace University, Shenyang, 110136, Liaoning
[2] Shenyang Liming Aeroengine Corporation Limited, Aero Engine Corporation of China, Shenyang
来源：
Sha, Yundong (ydsha2003@vip.sina.com) | 2018年 / Beijing University of Aeronautics and Astronautics (BUAA)卷 / 33期
关键词：
Fatigue life prediction; High temperature acoustic excitation; High temperature travelling wave tube tester; Response analysis; Thin-walled structures;
D O I：
10.13224/j.cnki.jasp.2018.11.001
中图分类号：
学科分类号：
摘要：
To solve thermal-acoustic fatigue of aero-engine thin-walled structure, the coupled finite element method/boundary element method was used to calculate dynamic response of GH188 thin-walled structures. Based on the theory of Miner liner fatigue accumulative damage, an improved rain-flow counting method and a Morrow mean stress model were adopted to estimate the fatigue life of thin-walled structures. With the use of high temperature travelling wave tube tester, GH188 thin-walled structure high temperature acoustic vibration fatigue test was conducted to obtain modal frequency, stress/strain response and fatigue life results of thin-walled structure under different temperatures and acoustic loads. It was shown in the contrastive analysis of the simulating calculation and test results that numerical simulation had accurate location judging for structural damage positions, all in the rooted positions of structures. The first-order thermal modal frequency was of consistent structures, with errors between 0.49%-2.09%, and X-stress response peaks were centered on fundamental frequency. With the rise of temperature, structure softening and stiffness reduction occurred, and response peak moved to the left; as the prediction level was consistent with the experiment, errors were between 1%-3%, validating the accuracy of thin-walled structure calculation method and model thermal-acoustic response. Structure fatigue life showed a decreasing trend with the increase of temperature and sound pressure level, and the predicted value of fatigue life and the test result were in the same order of magnitude, with the error between 3-3.5 times, satisfying the requirements of engineering level life prediction, and validating the effectiveness of simulation method for predicting thermal-acoustic fatigue life of thin-walled structure. © 2018, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：2561 / 2572
页数：11
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