PROCESS AND DEVICE FOR MONITORING A MACHINE

• US 20090217101A1
• Filed: 01/28/2009
• Published: 08/27/2009
• Est. Priority Date: 01/28/2008
• Status: Active Grant

• Current Assignee: PRÜFTECHNIK Dieter Busch GmbH
• Original Assignee: PRÜFTECHNIK Dieter Busch AG (Fortive Corp.)
• Inventors: Becker, Edwin
• Granted Patent: US 7,865,333 B2
• Time in Patent Office: Days
• US Class Current: 714/39
• CPC Class Codes: G05B 23/0278 Qualitative, e.g. if-then rules; Fuzzy logic; Lookup tables; Symptomatic search; FMEA
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A process for monitoring a machine, within the framework of a FMEA process for at least one component of the machine for at least one predetermined fault which can be diagnosed by means of a diagnosis diagram and a diagnosis system with sensors for detecting physical parameters of the machine, a diagnosis priority number being determined which is the product of the following index quantities: severity of the effect of occurrence of the fault with respect to the serviceability of the machine; expected machine-specific consequential costs when a fault occurs, and the possibility of correction of the fault. The diagnosis priority number is used in the evaluation of the diagnosis diagram, the diagnosis system, the current machine state, the necessary maintenance measures and/or the failure risk of the machine.

Claims

1. Process for monitoring a machine, within the framework of a fault possibility effect analysis (FMEA) process for at least one component of the machine for at least one predetermined fault which can be diagnosed by means of a diagnosis diagram and a diagnosis system with sensors for detecting physical parameters of the machine, comprising the steps of:

determining a diagnosis priority number which is a product of the following index quantities;

severity of the effect of occurrence of the fault with respect to the functioning of the machine;

expected machine-specific consequential costs when a fault occurs; and

the possibility of correction of the fault; and

using the diagnosis priority number determined for evaluation of at least one of a diagnosis diagram, diagnosis system, current machine state, necessary maintenance measures and failure risk of the machine.

2. Process in accordance with claim 1, wherein the machine evaluated on the basis of an evaluation of several machine components of which it is comprised and wherein at least one diagnosis priority number is determined for each of the machine components evaluated.

3. Process in accordance with claim 1, wherein the diagnosis priority number is used in selection of at least one of a diagnosis diagram and a diagnosis system.

4. Process in accordance with claim 1, wherein the diagnosis priority characteristic number is used for determining the timing and type of maintenance measures to be performed.

5. Process in accordance with claim 1, wherein the diagnosis priority number is recorded at regular time intervals.

6. Process in accordance with claim 1, wherein the expected remaining service life of the machine is considered in determining the severity of the effect of the occurrence of the fault.

7. Process for monitoring a machine within the framework of a fault possibility effect analysis (FMEA) process for at least one component of the machine for at least one predetermined vibration boundary value of the at least one machine component, comprising the steps of:

determining a vibration priority number which is a product of the following index quantities;

frequency with which a predetermined vibration boundary value is exceeded;

severity of the effect of the vibration boundary value being exceeded with respect to the functionality of the machine; and

probability of discovery of the vibration boundary value being exceeded by means of the vibration detection system which is provided, and

using the vibration priority number for evaluation of at least one of a current state of the machine, necessary maintenance measures, vibration detection system and the risk of machine failure.

8. Process in accordance with claim 7, wherein the machine evaluated on the basis of a separate evaluation of each of several machine components of which it is comprised with at least one vibration priority number being determined for each of the machine components.

9. Process in accordance with claim 7, wherein the vibration priority number is used in the choice of the vibration detection system.

10. Process in accordance with claim 7, wherein the vibration priority number is tracked over time and is evaluated for purposes of evaluating the change of the machine state over time.

11. Process in accordance with claim 10, wherein the tracked vibration priority number is considered in deciding the time and type of pertinent maintenance measures.

12. Process in accordance with claim 7, wherein a risk priority number is determined for at least one predetermined fault for at least one component of the machine, the a risk priority number being determined as a product of the following index quantities:

frequency with which a predetermined fault occurs in the operation of the machine;

severity of the effect of the occurrence of a fault with respect to the functioning of the machine; and

probability of discovery of the occurrence of a fault by means of a diagnosis diagram and diagnosis system being used; and

wherein the risk priority number is used in the evaluation of a current machine state, necessary maintenance measures, the diagnosis diagram, the diagnosis system and the failure risk of the machine.

13. Process in accordance with claim 12, wherein the machine evaluated on the basis of separate evaluation of each of several machine components of which it is comprised with at least one risk priority number being determined for each of the machine components.

14. Process in accordance with claim 12, wherein the risk priority number is used in at least one of designing of mechanical and configurational improvements for the machine.

15. Process in accordance with claim 12, wherein the risk priority number is used in making a choice of at least one of the diagnosis system and of the diagnosis diagram used.

16. Process in accordance with claim 12, wherein the risk priority number is considered in deciding the time and type of maintenance measures to be taken.

17. Process in accordance with claim 12, wherein the diagnosis system has vibration sensors.

18. Process in accordance with claim 12, wherein the diagnosis diagram has vibration boundary values.

19. Process in accordance with claim 7, wherein each of the index quantities has an integer value between 1 and 10.

20. Process in accordance with claim 7, wherein the machine is a wind power plant.

21. Process in accordance with claim 13, wherein the machine components include at least a drive line of a wind power plant.

22. Device for monitoring a machine, comprising:

a diagnosis system with sensors for detecting physical parameters of the machine and

a monitoring unit having a data processing system and which, within the framework of a fault possibility effect analysis (FMEA) process for at least one machine component for at least one predetermined fault which can be diagnosed by means of a diagnosis diagram and a diagnosis system, determines a diagnosis priority number which is a product of the following index quantities;

severity of the effect of the occurrence of the fault with respect to the functioning of the machine;

expected machine-specific consequential costs when a fault occurs; and

the possibility of correction of the fault.

23. Device in accordance with claim 22, wherein the diagnosis system with sensors for detecting physical parameters of the machine and the monitoring unit, for at least one machine component for at least one predetermined fault, a risk priority number which is the product of the following index quantities:

frequency with which the predetermined fault is exceeded in the operation of the machine;

severity of the effect of the occurrence of the fault with respect to the functioning of the machine; and

the possibility of detection of the occurrence of the fault by means of the diagnosis diagram and diagnosis system used.

24. Device for monitoring a machine, comprising:

a vibration detection system for detecting vibrations of at least one machine component, and

a monitoring unit having a data processing system and which, within the framework of a fault possibility effect analysis (FMEA) process for at least one machine component for at least one predetermined fault vibration boundary value of the machine component, determines and outputs a vibration priority number which is a product of the following index quantities;

frequency with which the predetermined vibration boundary value is exceeded;

severity of the effect of the vibration boundary value being exceeded with respect to the functioning of the machine; and

the possibility of detection of the vibration boundary value being exceeded by means of the vibration detection system which is provided.