Prediction of vibration characteristics of blisks using similitude models |
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| Authors: | Zhong Luo You Wang Jingyu Zhai Yunpeng Zhu Deyou Wang |
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| Institution: | 1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, PR China;2. Department of Ocean Engineering, Shenyang Institute of Automation Chinese Academy of Sciences, Shenyang, PR China;3. School of Mechanical Engineering, Dalian University of Technology, Dalian, PR China;4. Department of Automatic Control and System Engineering, University of Sheffield, Sheffield, UK;5. AVIC Shenyang Aero-engine Design Institute, Shenyang, PR China |
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| Abstract: | This study investigates the determination approach of distorted scaling laws for predicting the dynamic characteristic of an aero engine’s blisk. Based on the dynamic scaling laws of typical thin-walled structures, an assumption of geometrically complete scaling laws is firstly proposed and numerically validated. For distorted models of disk thickness, in order to simplify the design procedure, a simplification condition is proposed and applied to the first 10 orders’ distorted scaling laws (blade-dominated vibrations) by combining sensitivity analysis. Next, the 11th–14th orders’ distorted scaling laws are determined for disk-dominated vibrations. Numerical validation demonstrates that distorted scaling laws possess a good accuracy. Finally, the applicability of these new scaling laws is validated by the experimental data. The results indicate that, by using the new scaling laws, the simple models can predict vibration characteristics of blisk by employing similitude models. |
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| Keywords: | Blisk distorted scaling law similitude vibration |
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