PORTABLE ACOUSTIC THERMOGRAPHY OF IN SITU L-O BLADES BACKGROUND OF THE INVENTION

摘要

A system for performing acoustic thermography inspection of a turbine blade while the blade is in place in an assembled turbine. The system includes an acoustic thermography stack with a cap and a frame that the acoustic thermography stack is slidably mounted to, said frame including an end frame portion that allows the blade to be clamped between the cap and the end frame portion. The system also includes an air cylinder that provides force to move the acoustic thermography stack up and down a rail of the frame such that the turbine blade may be clamped between the cap and the end frame portion and then excited using the acoustic thermography stack, and a casing that encases the air cylinder, a portion of the acoustic thermography stack and a portion of the frame.

主权项

1. A system for performing acoustic thermography inspection of a turbine blade while the blade is in place in an assembled turbine, said system comprising:
an acoustic thermography stack that includes a horn, a piezoelectric portion, a booster and a cap; a frame that the acoustic thermograph stack is slidably mounted to, said frame including an end frame portion with a pivot plate that includes at least one spring-loaded pad that contours to the shape of the turbine blade that is clamped between the cap and the at least one spring-loaded pad; an air cylinder that provides force to move the acoustic thermograph stack up and down a rail of the frame such that the turbine blade may be clamped between the cap and the at least one spring-loaded pad, and then excited using the acoustic thermograph stack; and a casing that encases the air cylinder, a portion of the acoustic thermography stack and a portion of the frame.