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

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