Laser Doppler vibration testing: Final report. [Under difficult conditions]

Technical Report · Fri May 01 04:00:00 EDT 1987

OSTI ID:6800516

Assa, A S; Mannara, S R

This report summarizes work under EPRI project RP1855-2 conducted toward the objective of developing utility applications for a noncontacting laser Doppler vibration (LDV) measurement instrument. As part of the program, a dual beam laser doppler system was designed and fabricated in-house for the measurement of torsional vibrations of shafts. Laboratory tests were performed with this instrument to evaluate various signal processing approaches, and characterize the LDV performance with different laser powers and on several surface roughnesses. A factory test simulating field conditions was conducted on a full-size large steam turbine-generator rotor. The test was successful with the accuracy and linearity of the laser system within 10% of a reference measurement. Following the work on the dual beam system, work was directed toward field test evaluations of a portable reference beam laser doppler vibrometer. A main objective was to see if the LDV could perform satisfactorily under the rigors of a utility environment. Successful vibration measurements were taken on turbine steam leads at 1000/sup 0/F (without requiring unit shutdown), on heat exchanger tubes inside an operating boiler, from a rotating shaft, and from a black carbon collector brush at 500 volts. In the final test at United Illuminating Co., vibration data were obtained without unit shutdown from the generator neutral isophase bus lines with 13,000 amps of current in the line.

• Research Organization: General Electric Co., Schenectady, NY (USA); Electric Power Research Inst., Palo Alto, CA (USA)
• OSTI ID: 6800516
• Report Number(s): EPRI-CS-5031; ON: TI87920425
• Country of Publication: United States
• Language: English

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