Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Investigation of the impact of blade failure on the performance of a nonlinear bladed disk-shaft system

Document Type : Original Article

Authors
Mohammad Amin Vesal 1
Mohammad Reza Ghazavi 1
Asghar Najafi 2
1 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Mechanical Rotary Equipment Department, Niroo Research Institute, Tehran, Iran
10.22034/ijme.2024.474429.1998
Abstract
In industrial applications, blade shaft-disk systems, blade failure, leads to improper system operation and potential damage to other components. Therefore, structural health monitoring and preventing damage from failures is of high importance. Monitoring disk center displacement, bearing displacements, and mode shapes in bladed rotor systems with broken blades is essential for identifying dynamic changes, diagnosing faults, and predicting service life. Blade failure alters the system’s mode shapes, which, when analyzed, can enable early fault detection and prevent damage escalation. This process contributes to more precise maintenance planning, prevention of vibration amplification, and increased safety. In this article, two bladed shaft-disk systems are compared: one with four intact blades and another with five blades, one of which is broken. In the model, the shaft is considered flexible, the bearings are nonlinear, and the disk is unbalanced. The interaction between the disk and the blades, as well as the damping in the bearings and blades, is also accounted for in the model. Results show that the disk center displacement increases from 3 mm at a rotational speed of 1300 rpm to 6 mm at 1900 rpm. Displacement at the bearing locations increases up to sevenfold, leading to increased forces on the bearings. At lower frequencies, the system with a broken blade exhibits greater vibrations and power than the symmetrical system, and at frequencies between 60 and 100 Hz, both systems reach approximately the same power level.
Keywords
Bladed Disk Shaft System
Blade Failure
Stability
Mode Shape
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