Measuring and testing – Specimen model or analog
Patent
1990-08-30
1992-05-12
Noland, Tom
Measuring and testing
Specimen model or analog
73660, 36457108, G01M 1900
Patent
active
051117045
ABSTRACT:
A processor provides N series of discrete values, with each series of discrete values approximating a sinusoidal signal and N being the number of sensors with which a BVM to be tested is normally used. N digital to analog converters are provided, each receiving one of the N series of discrete values and producing an analog signal therefrom. The analog signals have zero crossings incorporating known turbine blade vibration information. N filters are provided, with each filter being responsive to one of the converters for filtering the analog signals. Circuitry is provided for producing an output pulse simulating a once per revolution pulse. Clock circuitry is provided for producing clock pulses which are input to the N converters and the circuitry for producing the output pulse for synchronizing the operation of the converters with the operation of the circuitry producing the output pulse.
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Development and Application of a Blade Vibration Monitor, P. F. Rozelle et al., Latest Advances in Steam Turbine Design, Blading, Repairs, Assessment and Condenser Interaction, PWR-vol. 7, ed. by D. M. Rasmussen, American Society of Mechanical Engineers, New York, 1989, pp. 37-45.
Noland Tom
Westinghouse Electric Corp.
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