Exploration of blade detuning tests for mistuning identification of blisks

Zhou, Biao; Zhao, Jingchao; Berruti, Teresa Maria

doi:10.1016/j.ymssp.2022.109118

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…Note that w 0 ¼ 0:957 represents a high-level blade mode isolation, in this case the BDT without corrections already yields a good estimation of the true mistuning pattern for the 1B mode. By contrast, in the previous work [22], w 0 ¼ 0:871 indicated a not perfect isolation of 1B blade mode, in that case, the correction procedure had been very effective.…”

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testscontrasting

confidence: 63%

“…Note that w 0 ¼ 0:957 for 1B mode in Fig. 10(a) has a magnitude close to 1, higher than that in the authors' previous work [22] (for 1B mode w 0 ¼ 0:871 was derived from BDTs with smaller-sized detuning masses for the blisk before blending). This implies that the position of the flat-shaped detuning mass is better selected and results in an improved mode decoupling performance.…”

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 53%

“…The bladealone mode shape is not covered in this test. Even if the blade-byblade impact testing procedure is a well-established technique The flat-shaped detuning mass (m d ¼ 9:2 g) on each blade in this test has a relatively larger area, compared with the smallsized mass used in the previous blade detuning tests [22] for the same blisk before blending. Its position around the leading edge tip enables it to cover a larger blade surface area with high kinetic energy density for both 1B and 1T blade modes.…”

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 99%

“…After the BDTs, an additional correction procedure was applied. This procedure was originally developed as a novel mistuning identification method in the authors' recent work [22]. Its primary intention is to quantify the residual interblade coupling due to mass detuning.…”

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 99%

“…The capability of the AMM to represent the dynamics of the real blended blisk is experimentally verified by blade detuning tests and experimental modal tests. A novel mistuning identification method, recently developed by the authors [22], is here employed in order to improve the accuracy of the estimated mistuning pattern after the blade detuning tests. Comparison of the numerical predictions by AMM and experimental reference data is then fully addressed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Blisk With Small Geometry Mistuning and Blend Repair: As-Measured Finite Element Model and Experimental Verification

Zhou

Zhao

et al. 2022

Journal of Engineering for Gas Turbines and Power

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This paper presents an 'As-Measured Model' of a blended blisk, built upon the measurement of the true geometry of the blisk by the 3D optical scanning technology. This high-fidelity model aims to account for the variances of blade frequencies and mode shapes within the real blisk in the presence of both the blend repair and inherent geometry mistuning due to manufacturing, etc. An improved mesh updating strategy is proposed to adapt a seed blisk finite element model to the measured geometry. The resultant 'as-measured model' is therefore able to accurately represent the measured blade-to-blade geometry variances. The classical blade detuning test in combination with a novel 'correction' procedure is employed to experimentally evaluate the 'blade-alone' frequency mistuning pattern in the real blisk. Experimental verification of the 'as-measured model' demonstrates that it is able to not only capture the 'blade-alone' frequency and mode shape variations due to both the blend and intrinsic blade geometry variances, but also to reproduce the global dynamics of the blended blisk with acceptable accuracy.

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Section: Experimental Mistuning Evaluation Based On Blade Detuning Testscontrasting

confidence: 63%

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 53%

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 99%

Section: Experimental Mistuning Evaluation Based On Blade Detuning Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Blisk With Small Geometry Mistuning and Blend Repair: As-Measured Finite Element Model and Experimental Verification

Zhou

Zhao

et al. 2022

Journal of Engineering for Gas Turbines and Power

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Predictive dynamic modeling and analysis of blisks through digital representations constructed upon precise geometry measurements

Zhou,

Xie,

Battiato

et al. 2024

Mechanical Systems and Signal Processing

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Forced Response of Rotating Blisks: Prediction and Correlation to Blade Tip-Timing Measurements

Zhou,

Xie,

Battiato

et al. 2024

Journal of Engineering for Gas Turbines and Power

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This paper explores two different blisk dynamic models for resonant vibration prediction of a rotating blisk test piece, i.e. the Model-BDTID and GMM. The former represents a mistuned blisk model with blade mistuning pattern experimentally retrieved by a recently proposed blade mistuning identification method based on blade detuning tests (BDTID). It falls into the scope of the frequency-mistuning modeling approach. The latter refers to a geometrically mistuned model constructed upon high-precision blisk geometry data by leveraging the advanced optical geometry measurement technology. A specifically developed ‘Sector Mode Assembling Reduction Technique’ is exploited for efficient dynamic analyses of the large-sized GMM. Forced response tests are performed in a spinning rig under well-controlled laboratory condition. The Blade Tip-Timing technique is employed to give all-blade vibration measurements of the rotating blisk. Correlation results between the forced response predictions to BTT measurements demonstrate that both the Model-BDTID constructed upon the identified blade mistuning of the blisk at rest and the GMM, can predict the resonant vibration of the rotating blisk with satisfactory accuracy.

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Exploration of blade detuning tests for mistuning identification of blisks

Cited by 6 publications

References 16 publications

Blisk With Small Geometry Mistuning and Blend Repair: As-Measured Finite Element Model and Experimental Verification

Blisk With Small Geometry Mistuning and Blend Repair: As-Measured Finite Element Model and Experimental Verification

Predictive dynamic modeling and analysis of blisks through digital representations constructed upon precise geometry measurements

Forced Response of Rotating Blisks: Prediction and Correlation to Blade Tip-Timing Measurements

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