Process and devices for the determination of the vibrations of the rotor of a rotary machine
First Claim
1. A process for determining vibrations of a rotor of a functioning rotary machine, said determining being performed during normal operating conditions, at high rotation operating speed Ω
- , said process comprising;
a) acquiring and digitizing a signal S emitted from at least one sensor C on a displacement of said rotor when the rotor is rotating in its normal operating conditions; and
b) subtracting a reference signal B of a same type,wherein B is determined beforehand,wherein B is acquired at rotor speed Ω
b that is lower than the operating speed Ω
such that signals emitted from at least two sensors (C1, C2) of rotor displacement are nearly identical when time offsets are ignored, said two sensors being offset at an angle in a same plane perpendicular to the symmetry axis of said rotor.
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Accused Products
Abstract
The invention is about the process of determining the vibration of rotor (1) of a rotary machine, by elimination of interference noise signals B, in which is acquired and digitized a signal S emitted by at least one sensor C of the displacement of the rotor (1) of the rotary machine when said rotor is rotating under its normal operating conditions, then is subtracted from it a reference signal B of the same type that has been determined in advance. This process is characterized in that the reference signal B has been acquired at a speed Ωb of rotor (1) rotation lower than the operating speed Ω and such that the signals emitted by at least two sensors (C1, C2) of the displacement of the rotor (1), offset at an angle in the same plane perpendicularly to the symmetry axis (A) of said rotor, are nearly identical, ignoring time offset. The invention also concerns the devices designed to implement such a process.
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Citations
22 Claims
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1. A process for determining vibrations of a rotor of a functioning rotary machine, said determining being performed during normal operating conditions, at high rotation operating speed Ω
- , said process comprising;
a) acquiring and digitizing a signal S emitted from at least one sensor C on a displacement of said rotor when the rotor is rotating in its normal operating conditions; and b) subtracting a reference signal B of a same type, wherein B is determined beforehand, wherein B is acquired at rotor speed Ω
b that is lower than the operating speed Ω
such that signals emitted from at least two sensors (C1, C2) of rotor displacement are nearly identical when time offsets are ignored, said two sensors being offset at an angle in a same plane perpendicular to the symmetry axis of said rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- , said process comprising;
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16. A device for determining the interference noise affecting the vibration signals of the rotor of a rotary machine, wherein said device comprises:
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at least two sensors (C1, C2) for determining a displacement of the rotor located in a same plane perpendicularly to a symmetry axis (A) of said rotor, said sensors being offset at an angle from each other, and means of treatment of B1 and B2 emitted by said sensors C1 and C2 respectively, said means of treatment being capable of determining a reference signal B that corresponds to sought after noises wherein said means of treatment acquires digitizes and records as a function of time signals B1 and B2 at low rotor rotation speed Ω
b, Ω
b being fixed or varying slowly,wherein said means of treatment provides time offsets of at least one of the signals B1, B2 in order to achieve a superposition of said signals, and wherein if signals B1 and B2 are sensibly identical, said means of treatment select one of said signals as reference B signal;
otherwise, said means of treatment repeats with new rotor speed. - View Dependent Claims (17, 18, 19, 20)
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21. A device for determining vibrations of a rotor of a rotary machine functioning at high rotation speed Ω
- , said device comprising;
at least one sensor C that detects displacement of said rotor; a unit for digitization, recording, and complementary treatment of signal S emitted by said sensor C, wherein said unit for complementary treatment can subtract from the signal a reference signal B that has been previously acquired, digitized, and recorded at speed Ω
b slower than the operating speed Ω
, Ω
b being such that the signals emitted by at least two sensors (c1, C2) that sense displacement of said rotor are identical when time offset is ignore said sensors being offset at an angle in a same plane perpendicularly to a symmetry axis of the rotor. - View Dependent Claims (22)
- , said device comprising;
Specification