发明名称 |
Low rotor vibration avoidance in aircraft gas turbine engines |
摘要 |
Corrected fan speed (N1C2) and engine pressure ratio (EPR) are controlled, by controlling exhaust nozzle area (EA) according to a schedule or map so that as altitude increases (P2 decreases) the axial forces on the low rotor are sufficient to minimize low rotor vibrations. The altitude band (critical load region) is determined that produces loading levels in which vibrations appear. As this band is approached, conventional control of N1C2 and EPR is automatically over-ridden. N1C2 is decreased with altitude and exhaust area is reduced, thereby increasing the axial force (load) on the low rotor. When the upper limit of the band is reached, conventional control of N1C2 and EPR is automatically resumed, resulting in crossing the critical load region rapidly over a narrow altitude band.
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申请公布号 |
US5687564(A) |
申请公布日期 |
1997.11.18 |
申请号 |
US19950566846 |
申请日期 |
1995.12.04 |
申请人 |
UNITED TECHNOLOGIES CORPORATION |
发明人 |
KELLY, JAMES B.;OLSON, KENNETH D.;DAVIS, JOHNNY B.;BRACCI, GERALD |
分类号 |
F01D25/04;F02C9/28;F02K1/16;(IPC1-7):F02K1/15 |
主分类号 |
F01D25/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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