| Abstract:In order to realize the high precision measurement of BTC (Blade Tip Clearance) under variable speed conditions, the eddy
current sensor was dynamically calibrated at multiple speeds, and the adaptive measurement method of BTC under different speed condi?
tions was proposed based on the dynamic sensitivity curve. The proposed method was validated by numerical simulation and bench tests
with twisted blades installed, and the results show that the measurement deviation of the proposed multi-rotational speed dynamic calibra?
tion method is less than 9 μm, with high accuracy in measuring dynamic BTC. In response to the situation that there are limited measuring
points and most of them are located on the aeroengine casing, a preliminary method for monitoring axis trajectory based on uniformly
distributed four-sensor BTC measurement was proposed, which realizes the simultaneous monitoring of BTC and rotor vibration under the
condition of limited measurement points. A simple principle rotor model was built, and verification tests were conducted, the results show
that the rotor axis trajectory can be accurately extracted based on the monitored BTC information, verifying the feasibility of applying the
method tosimple rotor models. |
