Condition analyzer

• US 6,499,349 B1
• Filed: 01/04/1999
• Issued: 12/31/2002
• Est. Priority Date: 07/05/1996
• Status: Expired due to Fees

• Current Assignee: S.P.M. Instrument AB
• Original Assignee: S.P.M. Instrument AB
• Inventors: Aronsson, Carsten
• Primary Examiner(s): Larkin, Daniel S.
• Assistant Examiner(s): MILLER, ROSE MARY
• Application Number:
  US09/214,291
• Time in Patent Office: 1,457 Days
• Field of Search: 736/60, 736/61, 736/59, 735/93, 702/56, 702/77, 340/683
• US Class Current: 73/659
• CPC Class Codes: G01D 18/008 with calibration coefficients stored in memory
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G07C 3/00 Registering or indicating the condition or the working of machines or other apparatus, other than vehicles

Abstract

The invention relates to a method for evaluating the condition of a machine (100) with a measuring point (90), which method is performed by a movable analysis apparatus (30). The method comprises the steps of producing a condition value, by means of measuring at the measuring point, which condition value is dependent on the actual condition of the machine, and storing the condition value in a writable information carrier (120) which is place by, or in the vicinity of, the measuring point (90) so that the condition value subsequently can be used as a reference condition value. The invention further relates to an apparatus for performing the method and a device for co-operating with the analysis apparatus and for mounting by a measuring point on machine (100).

Claims

1. A system for analyzing a condition of a machine having moving parts, said system comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface; and

an analysis apparatus comprising;

a microprocessor;

a non-volatile memory;

a sensor unit constructed and arranged to connect to the connection coupling so that vibrations of the machine are transmitted to the sensor unit; and

an analysis apparatus communication interface constructed and arranged to allow bi-directional communication with the measuring point communication interface;

wherein the non-volatile memory stores instructions adapted to be executed by the microprocessor to perform the steps of;

calculating a condition value based on interpretation data related to the machine and measured vibration values; and

storing the calculated condition value in the information carrier of the measuring point as a reference value.

2. The system of claim 1, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

3. The system of claim 1, wherein the non-volatile memory additionally stores instructions adapted to be executed by the microprocessor to perform the steps of:

requesting measured vibration values from the sensor unit;

acquiring interpretation information and a condition reference value from the information carrier;

calculating a condition current value based on the measured vibration values and the interpretation information; and

producing a relation value based on the condition reference value and the condition current value.

4. The system of claim 3, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

5. The system of claim 3, wherein the relation value represents a division of the condition current value by the condition reference value.

6. The system of claim 3, wherein relation value represents a difference between the condition current value and the condition reference value.

7. A system for analyzing a condition of a machine having moving parts, said system comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface; and

an analysis apparatus comprising;

a microprocessor;

a non-volatile memory;

a sensor unit constructed and arranged to connect to the connection coupling so that vibrations of the machine are transmitted to the sensor unit; and

an analysis apparatus communication interface constructed and arranged to allow bi-directional communication with the measuring point communication interface;

wherein the non-volatile memory stores instructions adapted to be executed by the microprocessor to perform the steps of;

requesting current measured vibration values from the sensor unit;

acquiring the interpretation information and the condition reference value from the information carrier;

calculating a condition current value based on the current measured vibration values and the interpretation information; and

producing a relation value based on the condition reference value and the condition current value.

8. The system of claim 7, wherein the condition reference value represents a condition of the machine at an earlier point in time.

9. The system of claim 7, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

10. The system of claim 7, wherein the relation value represents a division of the condition current value by the condition reference value.

11. The system of claim 7, wherein relation value represents a difference between the condition current value and the condition reference value.

12. A system for analyzing a condition of a machine having moving parts, said system comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface;

means for analyzing the machine by measuring vibration of the machine through the connection coupling, reading information related to the machine from the information carrier through the measuring point communication interface, and determining a current state of the machine;

wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

13. The system of 12, wherein the information carrier contains information related to a measurement taken at the connection coupling of the first component.

14. A system for analyzing a condition of a machine having moving parts, comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface;

a sensor unit comprising a vibration transducer, the sensor unit being structured to physically engage the connection coupling of the measuring point so that vibrations of the machine at the measuring point are transferred to the vibration transducer;

an analysis apparatus comprising an analog-to-digital converter electrically connected to receive an output of the transducer, a microprocessor electrically connected to receive an output of the analog-to-digital converter, and an analysis apparatus communication interface connected to the microprocessor;

wherein the system is arranged to allow bidirectional communication between the measuring point communication interface and the analysis apparatus communication interface, and wherein the measuring point communication interface and the analysis apparatus communication interface are constructed to allow the communication without ohmic contact therebetween.

15. The system of claim 14, wherein the measuring point communication interface and the analysis apparatus communication interface are constructed to communicate with one another by radio transmissions.

16. The system of claim 14, wherein the measuring point communication interface and the analysis apparatus communication interface are constructed to communicate with one another by optical transmissions.

17. The system of claim 16, wherein the optical transmissions comprise pulses of infrared light.

18. The system of claim 14, wherein the system is constructed to allow the bidirectional communication between the measuring point communication interface and the analysis apparatus communication interface while the sensor unit is physically engaged with the connection coupling of the measuring point.

19. A method for analyzing a condition of a machine having moving parts, the machine having a measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface, the method comprising the steps of:

connecting an analysis apparatus having a sensor unit comprising a vibration transducer to the measuring point so that vibrations of the machine at the measuring point are transferred to the vibration transducer;

converting an output of the transducer to digital data;

analyzing the digital data to produce a first condition value; and

communicating the first condition value through an analysis apparatus communication interface and the measuring point communication interface to the information carrier;

wherein the communication between the measuring point communication interface and the analysis apparatus communication interface is performed without ohmic contact therebetween.

20. The method of claim 19, further comprising the steps of:

after communicating the first condition value to the information carrier, repeating the connecting, converting, and analyzing steps to produce a second condition value;

communicating the first condition value from the information carrier to the analysis apparatus through the measuring point communication interface and the analysis apparatus communication interface; and

comparing the first and second condition values.

21. A system for analyzing a condition of a machine having moving parts, said system comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface; and

an analysis apparatus comprising;

a microprocessor;

a non-volatile memory;

a sensor unit constructed and arranged to connect to the connection coupling so that vibrations of the machine are transmitted to the sensor unit; and

an analysis apparatus communication interface constructed and arranged to allow bi-directional communication with the measuring point communication interface without ohmic contact;

wherein the non-volatile memory stores instructions adapted to be executed by the microprocessor to perform the steps of;

calculating a condition value based on measured vibration values; and

storing the calculated condition value in the information carrier of the measuring point as a reference value.

22. The system of claim 21, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

23. The system of claim 21, wherein the non-volatile memory additionally stores instructions adapted to be executed by the microprocessor to perform the steps of:

requesting measured vibration values from the sensor unit;

acquiring a condition reference value from the information carrier;

calculating a condition current value based on the measured vibration values; and

producing a relation value based on the condition reference value and the condition current value.

24. The system of claim 23, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

25. The system of claim 23, wherein the relation value represents a division of the condition current value by the condition reference value.

26. The system of claim 23, wherein relation value represents a difference between the condition current value and the condition reference value.

27. A system for analyzing a condition of a machine having moving parts, said system comprising:

a measuring point attached to the machine, the measuring point comprising a connection coupling, an information carrier, and a measuring point communication interface; and

an analysis apparatus comprising;

a microprocessor;

a non-volatile memory;

a sensor unit constructed and arranged to connect to the connection coupling so that vibrations of the machine are transmitted to the sensor unit; and

an analysis apparatus communication interface constructed and arranged to allow bi-directional communication with the measuring point communication interface without ohmic contact;

wherein the non-volatile memory stores instructions adapted to be executed by the microprocessor to perform the steps of;

requesting current measured vibration values from the sensor unit;

acquiring the condition reference value from the information carrier;

calculating a condition current value based on the current measured vibration values; and

producing a relation value based on the condition reference value and the condition current value.

28. The system of claim 27, wherein the condition reference value represents a condition of the machine at an earlier point in time.

29. The system of claim 27, wherein the measuring point comprises first and second physically separate components individually attached to the machine, the first component comprising the connection coupling, the second component comprising the information carrier and the measuring point communication interface.

30. The system of claim 27, wherein the relation value represents a division of the condition current value by the condition reference value.

31. The system of claim 27, wherein relation value represents a difference between the condition current value and the condition reference value.