Non-Contact Blade Vibration Information System BeSSI
By the use of two electric sensors in the casing above the rotating blades’ tip the vibrational deflection of all blades of a wheel can be measured. The system, well proved for temporary measurements in model turbines as well as in steam and gas turbines, is now developed for the uninterrupted observation of the vibrational behavior of all last stage rotating blades of high power steam turbines. Operational conditions leading to life-reducing stresses will thus be made obvious and can then be avoided. If mavoidable the remaining service life of each blade is determined continuously and a warning is given before consumption of all fatigue life, i.e. before starting of a crack.
KeywordsVibration Signal Model Turbine Remain Service Life Blade Vibration Signal Processing Unit
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