| 摘要 |
A method of determining rotor blade axial displacement (b ij ). The rotor blade tip (34) comprises first and second measurement features (36, 38) arranged to make an acute angle therebetween. Measure time of arrival (t ijk ) of the once per revolution feature (1), first and second edges (40, 42) of the first measurement feature (36), and first and second edges (44, 46) of the second measurement feature (38), for at least two revolutions of the rotor (2). Convert these to circumferential distances (d ijk ) for each revolution. Calculate a feature angle (± ijk ) between each measurement feature (36, 38) and the once per revolution feature (1) for each revolution. Calculate blade untwist angle (Õ ij ) from the change in feature angle (± ijk ) between measured revolutions. Calculate the rotor blade axial displacement (b ij ) from the blade untwist angle (Õ ij ) and the circumferential distance (d ijk ) of the point from one of the measurement features (36, 38). |
