公开(公告)号：US20180003073A1

公开(公告)日：2018-01-04

申请号：US15620163

申请日：2017-06-12

Applicant: ROLLS-ROYCE plc

Inventor： Arthur L ROWE ,  Mark N BINNINGTON ,  Colin J WOODWARD ,  Paul R THORNTON

IPC: F01D21/00 ,  G01P3/46 ,  F02C9/00 ,  F04D27/00

CPC classification number: F01D21/003 ,  F01D21/04 ,  F02C9/00 ,  F04D27/001 ,  F05D2220/32 ,  F05D2240/20 ,  F05D2260/83 ,  F05D2270/304 ,  G01H1/006 ,  G01P3/46

Abstract: A rotor assembly (30) comprising a rotor (32) having an annular array of rotor blades (34), the rotor mounted to a shaft (38). A phonic wheel (40) coupled to the shaft. A speed sensor (44) axially aligned with the phonic wheel and configured to measure voltage (V), amplitude of the voltage being proportional to clearance (46) between the sensor and phonic wheel. A processor (48) configured to: receive the voltage measurement; derive shaft speed (ω) from the voltage measurement; identify modulation of the voltage amplitude at a frequency which is an integer multiple of the shaft speed; compare voltage amplitude to a threshold; and output a rotor damage signal based on the comparison.