Claims
- 1. A method of monitoring the condition of an industrial apparatus that operates during normal operation at a normal operating speed that is substantially constant, the method comprising:
during normal operation, measuring a signal indicating a condition of the apparatus and steadiness of operation thereof from at least one rotating component of the apparatus by using a fixedly mounted condition monitoring system during the operation of the apparatus at the normal operating speed, and calculating characteristic values and characteristic functions from each measured signal to detect variations deviating from normal operation that may indicate potential malfunction; and during transient operation while a change in operating speed of the apparatus takes place such that the apparatus does not operate at a constant operating speed, measuring at least one signal indicating the condition of the apparatus and the steadiness of the operation from at least one component of the apparatus and calculating said characteristic values and characteristic functions from each said signal as a function of at least one of a measured time and a measured rotational speed of the at least one component.
- 2. A method as claimed in claim 1, wherein during transient operation signals are measured simultaneously from a plurality of components of the apparatus.
- 3. A method as claimed in claim 2, wherein during transient operation signals are measured simultaneously from at least all components that are monitored during normal operation.
- 4. A method as claimed in claim 2, wherein at least one of the calculated characteristic values and characteristic functions for said plurality of components are arranged to the same scale proportional to the measurement time to enable mutual comparison.
- 5. A method as claimed in claim 2, further comprising forming a spectrogram from at least some of the measured signals, the spectrogram illustrating the time dependence of its spectrum.
- 6. A method as claimed in claim 2, further comprising setting alarm threshold values for at least some of the components on the basis of the calculated characteristic values and characteristic functions therefor, the alarm threshold values for said components being dependent on said components' rotational speeds.
- 7. A method as claimed in claim 1, wherein a plurality of components are monitored with a fixedly mounted condition monitoring system in a paper machine.
- 8. A method as claimed in claim 1, wherein a vibration of at least one component is measured and a resulting vibration signal is used when calculating the characteristic values and characteristic functions.
- 9. A method as claimed in claim 1, wherein a pressure signal of at least one component is measured and a resulting pressure signal is used when calculating the characteristic values and characteristic functions.
- 10. A method as claimed in claim 1, wherein a temperature of at least one component is measured and a resulting temperature signal is used when calculating the characteristic values and characteristic functions.
Priority Claims (1)
Number |
Date |
Country |
Kind |
991559 |
Jul 1999 |
FI |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of International Application PCT/FI00/00626 filed Jul. 6, 2000, which designated the United States and was published under PCT Article 21(2) in English, and which is hereby incorporated herein in its entirety.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/FI00/00626 |
Jul 2000 |
US |
Child |
10040881 |
Jan 2002 |
US |