System and method for monitoring health of airfoils

• Main Authors: Badami, Vivek Venugopal, Behera, Ajay Kumar, Prabhu, Rahul Srinivas, Rajagopalan, Venkatesh, Bhattacharya, Aninda
• Format: Patent
• Language: English; French; German
• Published: 27.02.2019
• Subjects: BLASTING; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; ENGINE PLANTS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MECHANICAL ENGINEERING; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PHYSICS; REGULATING; STEAM ENGINES; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

A method for monitoring the health of a plurality of blades 12 is presented. The method includes the steps of determining 106 delta TOAs corresponding to the plurality of blades 12, determining 404 a standard deviation utilizing the delta TOAs corresponding to the plurality of blades; determining 412 a delta sigma_1 utilizing the standard deviation and an initial standard deviation, determining 414 a normalized delta TOA corresponding to one or more of the plurality of blades utilizing the delta sigma_1, determining 416 a standard deviation of the normalized delta TOA, determining 418 a delta sigma_2 utilizing the standard deviation of the normalized delta TOA and a previous standard deviation of normalized delta TOA, and determining 418 a corrected delta TOA corresponding to the one or more of the plurality of blades based upon the delta sigma_2.