Method for determining the untwist of turbine blades

Details Method for determining the untwist of turbine blades Method for determining the untwist of turbine blades

1989-07-26

1990-08-28

Myracle, Jerry W.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

G01M 1500

Patent

active

049515004

ABSTRACT:
A method of determining the untwist of turbine blades under dynamic conditions is comprised of the steps of producing a first pair of blade passing event signals in response to a blade tip's movement past a pair of fixed sensors. The signals comprising the first signal pair are compared to one another to establish a first differential value. Another data point containing blade vibrational information is produced. The first differential value and the other data point are evaluated to discriminate between blade untwist and synchronous vibration. Based on the magnitude of the blade untwist, inferences can be drawn regarding the status of the turbine blade lashing wires.

REFERENCES:
patent: 3467358 (1969-09-01), Zablotsky et al.
patent: 4518917 (1985-05-01), Oates et al.
patent: 4573358 (1986-03-01), Luongo

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