Modal parameter determination and chatter prediction for blade whirling: a comparative study based on symmetric and asymmetric FRF

Abstract

Whirling has been adopted for the cost-effective machining of blade-shape components in addition to traditional end milling and flank milling processes. To satisfy the requirements of rotary forming in the blade whirling process, the workpiece must be clamped at both ends in suspension and rotated slowly during machining, which complicates the dynamics. This study aims to identify the dynamic characteristics within the blade whirling operation and present strategies for stability prediction. In this study, the dynamic characteristics of a whirling system are modeled by assuming symmetric and asymmetric parameters. Theoretical prediction frequency response function (FRF) results are compared with experimental results. Moreover, semi-discretization stability lobe diagrams (SLDs) obtained using the dynamic parameters of these models are investigated experimentally. The results show that the asymmetric model is more suitable for describing the whirling system, whereas the symmetric model presents limitations associated with the frequency range and location of measuring points. Finally, a set of airfoil propeller blade whirling operations is conducted to verify the prediction accuracy.

Keywords

Whirling / Asymmetric frequency response function (FRF) / Stability lobe diagrams (SLD) / Semi-discretization method

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Funding

Natural Science Foundation of Shandong Province http://dx.doi.org/10.13039/501100007129(No. ZR2017MEE021)