首页|Blade dynamic strain non-intrusive measurement using L1/2-norm regularization and transmissibility
Blade dynamic strain non-intrusive measurement using L1/2-norm regularization and transmissibility
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NSTL
Elsevier
? 2022 Elsevier LtdDynamic strain measurement is critical in blade vibration monitoring for evaluating the residual life and health condition of rotating blades. Blade tip time (BTT) is recognized as a promising technique to replace traditional strain gauge measurement. This paper presents a method for dynamic strain reconstruction as well as vibration parameter identification based on BTT via the L1/2-norm sparse regularization and response transmissibility. First, a sparse representation model based on the L1/2-norm penalty is developed to identify blade vibration frequency and blade-tip displacement. Second, a displacement-to-strain transmissibility (DST) is proposed for strain reconstruction from identified displacement. The mode shapes of the blade are needed to calculate the DST. The proposed method is named L1/2-DST, which has a great advantage of achieving non-intrusive strain measurement for rotating blades using BTT. Numerical simulation and spin experiment show that the L1/2-DST method enables accurate dynamic strain reconstruction and robustness to noise.
Blade tip timingL1/2-norm regularizationRotating bladesStrain reconstructionTransmissibility
Ao C.、Qiao B.、Chen L.、Xu J.、Liu M.、Chen X.
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School of Mechanical Engineering Xi'an Jiaotong University
NSTL
Elsevier
