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Full-Text Articles in Mechanical Engineering
Rotor Crack Detection Using Active Magnetic Bearings, Jerzy Sawicki
Rotor Crack Detection Using Active Magnetic Bearings, Jerzy Sawicki
Jerzy T. Sawicki
Well-established procedures exist to monitor and diagnose fairly severe problems with rotating machinery but little progress has been made in developing techniques to detect subtle changes in machine condition for both improved diagnostics, and to develop prognostic procedures for determining remaining service life. Of all machine faults, crack initiated problems present probably the most significant safety and loss hazard in modern turbomachinery, including aircraft engines and power generation units. Different approaches are used to model, detect, and localize crack-induced damage in rotating structures. This paper presents novel application of active magnetic bearings (AMBs) for on-line rotor crack detection. AMB-actuators provide …
Vibration Based Method For Shaft Crack Detection, Zdzisław Gosiewski, Jerzy Sawicki
Vibration Based Method For Shaft Crack Detection, Zdzisław Gosiewski, Jerzy Sawicki
Jerzy T. Sawicki
Various excitation techniques have been developed to extract information on dynamic state of rotating machinery. This paper will address the effectiveness of selected excitations and analysed signals towards health monitoring of rotating machines from the cracked shaft dynamics point of view. The computer simulation study is based on the uncracked and cracked Jeffcott rotor models and the efficiency of the selected approaches is examined. As the excitation we have considered the rotor unbalance, additional harmonic forces, and input conditions. The combined resonances as diagnostic indicators of the crack in the shaft can be clearly seen in the total frequency spectrum …