Steady-state coupling vibration analysis of shaft–disk–blade system with blade crack

Abstract

Rotating shaft-disk-blade (RSDB) system is one of the most important parts of turbomachinery, such as aero-engine, gas turbine and power plant. The coupling vibration of RSDB system with blade crack is vital for the blade health monitoring and crack detection of rotating blade. This study aims at addressing the dynamic modeling and steady-state coupling vibration mechanism of RSDB system with blade crack. First and foremost, on the basis of the stress state at crack section, an improved analytical breathing crack model (modified stress-based breathing crack model, MSBCM) for rotating blade is proposed. The validity of the proposed breathing crack model is verified by comparing the results obtained by MSBCM, finite element contact crack model and conventional analytical crack models. The comparative results suggest that MSBCM is of high fidelity and behaves best among the analytical crack models. Subsequently, a comprehensive dynamic model of the coupling vibration for RSDB system with blade crack is formulated on the basis of continuum

Mechanical vibration monitoring system for electrocardiogram machine based on Hilbert‐Huang transformations

“…Yang et al. developed the vibration monitoring system of spindle bearing of NC machine tool with virtual instrument technology based on LabVIEW [22]. Nazolin et al.…”

“…Casamenti et al studied the influence of load, position, and instantaneous acceleration on the measured signal, and proposed a machine tool condition monitoring system that can trace the fault source[20,21]. Yang et al developed the vibration monitoring system of spindle bearing of NC machine tool with virtual instrument technology based on LabVIEW[22]. Nazolin et al used wavelet transform to analyze the time-frequency characteristics of machine tool spindle vibration signal, but the essence of wavelet transform is Fourier transform with adjustable window.…”

Simulation study of crack parameters’ effects on the vibration characteristics of a bladed disk system

“…Liu et al [19] used the hexahedral finite element method to analyze the dynamics of the cracked blade, compared the breathing effect of the cracked blade and the natural frequency at different crack depths with the calculation results of the contact unit method, and found that the calculation results of the hexahedral unit are in good agreement with the contact finite element calculation results. The above research results show that the crack depth and crack location are two important factors affecting the vibration characteristics of the bladed disk [20], [21]; however, there is a lack of comparative study on the influence of these two factors on the vibration characteristics of bladed disks, as well as the vibration characteristics of bladed disks with multiple cracks.…”