基于阻抗匹配与电涡流效应的刚性曲面轴径向位移无线测试方法OA

Mismatch and displacement induced by mechanical failures of aero-engine components under high-temperature conditions will lead to operational abnormalities,which seriously threaten flight safety.To realize the operational condition monitoring of rigid curved shafts in aero-engines under harsh environments,a wireless radial displacement measurement method for rigid curved shafts based on impedance matching and eddy current effect is proposed.The sensor probe is fabricated by screen printing and high-temperature sintering processes.The displacement signal is wirelessly transmitted to the network analyzer through electromagnetic coupling between the probe and the rigid curved shaft,where variations in displacement will result in corresponding changes in S11(return loss).Test results show that under normal temperature conditions,the displacement exhibits a strictly monotonic relationship with S11 within the range of 0～15 mm,which verifies the feasibility of this method for wireless displacement measurement of rigid curved shafts.Under the high-temperature environment of 200℃,the displacement sensor achieves a resolution of 10 µm,with a maximum repeatability error of 1.16%and a maximum relative error of 1.19%.