Parallel processing in a vibration analyzer

• US 5,965,819 A
• Filed: 07/06/1998
• Issued: 10/12/1999
• Est. Priority Date: 07/06/1998
• Status: Expired due to Term

• Current Assignee: Computational Systems Incorporated (Emerson Electric Company)
• Original Assignee: CSI Technology Incorporated (Emerson Electric Company)
• Inventors: Robinson, James C., Nelson, Thomas E., Piety, Kenneth R.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): Kwok, Helen C.
• Application Number:
  US09/110,807
• Time in Patent Office: 463 Days
• Field of Search: 73/660, 73/661, 73/659, 73/40.7, 73/587, 73/657, 73/602, 702/56, 702/76, 702/77, 702/38, 702/57, 702/58, 702/59, 702/104, 702/185, 702/190
• US Class Current: 73/660
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01N 29/44 Processing the detected response signal , e.g. electronic circuits specially adapted therefor digital signal processing per se G06F17/00

Abstract

A portable data collector and analyzer having multiple paths for performing multiple processing functions on a single sensor signal in parallel. The portable data collector has a sensor which creates a sensor signal that represents a measured property of an operating machine. The sensor signal is simultaneously sent to at least two processor channels that are connected in parallel. Each processor is capable of performing different types of signal analysis with varying signal conditioning and sampling rate requirements on the sensor signal independent of the other processor(s). An operator of the parallel processing data collector and analyzer places the single sensor on the area desired to be tested and instructs the parallel processing data collector to begin taking measurements. The parallel processor channels work independently of each other to obtain results corresponding to a number of different tests in approximately the time normally required to perform a single test.

Claims

1. An apparatus for collecting and analyzing vibration data, the apparatus comprising:

a vibration sensor for sensing vibrations and producing an electrical signal corresponding to the sensed vibrations;

a first receiving circuit for receiving the electrical signal corresponding to the sensed vibrations from the vibration sensor and conditioning and sampling the electrical signal to produce a first conditioned signal;

a second receiving circuit for receiving the electrical signal corresponding to the sensed vibrations from the vibration sensor and conditioning and sampling the electrical signal to produce a second conditioned signal;

a first microprocessor for receiving the first conditioned signal and processing the first conditioned signal to produce a first processed output indicative of the presence or absence of a machinery defect; and

a second microprocessor for receiving the second conditioned signal and processing the second conditioned signal to produce a second processed output indicative of the presence or absence of a machinery defect.

2. The apparatus of claim 1 further comprising output means for electrically receiving the first and second processed outputs from the first and second microprocessors and providing the first and second processed outputs to an external device.

3. The apparatus of claim 1 further comprising a display for providing an operator of the apparatus status information concerning the collecting and analyzing of the vibration data and displaying the first and second processed outputs.

4. The apparatus of claim 1 further comprising:

a plurality of receiving circuits for receiving the electrical signal corresponding to the sensed vibrations from the vibration sensor and conditioning and sampling the electrical signal to produce a plurality of conditioned signals; and

a plurality of microprocessors for receiving the plurality of conditioned signals and processing the plurality of conditioned signals to produce a plurality of processed outputs indicative of the presence or absence of machinery defects.

5. The apparatus of claim 4 further comprising a plurality of analog to digital converters for receiving the plurality of conditioned signals from the plurality of receiving circuits and sampling the plurality of conditioned signals at a plurality of different sampling rates to create a plurality of digital signals that are provided to the plurality of microprocessors.

6. The apparatus of claim 5 further comprising a central processing unit for controlling the operation of the apparatus.

7. The apparatus of claim 1 wherein the vibration sensor contains a vibration transducer that produces an electrical signal in response to vibrations.

8. The apparatus of claim 1 further comprising storage means for receiving and storing the processed outputs.

9. The apparatus of claim 1 further comprising a temperature sensor for producing a voltage signal that corresponds to the temperature of an area from which the vibration sensor is sensing vibrations.

10. A hand held vibration data collector and analyzer system for collecting, analyzing and storing vibration data that is produced by and collected from a series of machines, comprising:

a housing dimensioned and configured for being hand held by a user;

a vibration transducer for sensing vibration that is produced by the machines and producing an analog signal corresponding to the vibration;

a first conditioning circuit for receiving and conditioning the analog vibration signal from the vibration transducer to produce a first conditioned analog signal;

a second conditioning circuit for receiving and conditioning the analog vibration signal from the vibration transducer to produce a second conditioned analog signal;

a first data processor mounted in the housing for receiving and processing the first conditioned analog signal to produce a first set of desired digital data;

a second data processor mounted in the housing for receiving and processing the second conditioned analog signal to produce a second set of desired digital data;

a keyboard interfaced with the first and second data processors for inputting commands and data to the first and second data processors;

a memory interfaced with the first and second data processors for storing information; and

a display interfaced with the first and second data processors for displaying information to the user.

11. The system of claim 10 wherein the first and second conditioning circuits contain analog to digital converters for sampling the first and second conditioned analog signals to produce first and second digital conditioned signals, respectively, and the first and second data processors receive the first and second conditioned digital signals.

12. The system of claim 11 wherein the analog to digital converters sample the first and second conditioned analog signals at different sampling rates.

13. The system of claim 11 wherein at least one of the first and second data processors further comprises a digital signal processor that receives one of the conditioned digital signals and performs a Fast Fourier Transform on the received conditioned digital signal to produce a frequency spectrum.

14. The system of claim 13 wherein the digital signal processor performs a rasterization operation on the frequency spectrum to generate a digitally encoded graphical representation of the frequency spectrum and transferring the digitally encoded graphical representation of the frequency spectrum to the memory.

15. The system of claim 11 wherein at least one of the first and second data processors performs a low-pass filtering and decimation operation on one of the conditioned digital signals to produce a filtered digital signal having a reduced sample rate as compared to the corresponding conditioned digital signal before decimation and is representative of a portion of the conditioned digital signal having a frequency below a selected upper frequency.

16. The system of claim 10 wherein at least one of the first and second conditioning circuits includes a fixed frequency analog anti-aliasing filter having a fixed upper cutoff frequency set at a desired frequency equal to a maximum vibration frequency of interest for producing at least one conditioned analog signal having a desired frequency range.

17. The system of claim 11 wherein the first and second conditioning circuits have amplifiers for producing the first and second digital conditioned signals at a desired amplitude.

18. The system of claim 10 further comprising a central processing unit for controlling the functioning of the hand held vibration data collector and analyzer system.

19. The system of claim 18 further comprising a direct memory access for transferring data from the first and second data processors to the memory without interrupting the functioning of the central processing unit.

20. A vibration data collector and analyzer apparatus comprising:

a single vibration sensor for producing an electrical vibration signal in response to vibrations produced by an operating machine;

at least two microprocessors for receiving the electrical vibration signal from the sensor and independently performing digital signal analysis techniques on the electrical vibration signal to produce results and examining the results to determine if the electrical vibration signal indicates that the operating machine may have a fault or defect;

an output device for receiving the results of the digital signal analysis techniques from the at least two microprocessors and providing the results of the digital signal analysis techniques to a user of the vibration data collecting and analyzing apparatus;

a memory receiving and storing the results of the digital signal analysis techniques from said at least two microprocessors; and

a power supply for providing power to the vibration data collecting and analyzing apparatus.

21. A hand held data collector and analyzer system for collecting, analyzing and storing data that is produced by and collected from a series of operating machines, comprising:

a protective housing constructed out of a durable material for housing the data collector and analyzer system wherein the protective housing is dimensioned and configured for being portably held in the hands of a user;

a machine sensor mounted on the protective housing for sensing properties of operating machines and producing an analog machine sensor signal corresponding to the sensed properties of the operating machines;

a first signal conditioning circuit for receiving and conditioning the analog machine sensor signal from the machine sensor to produce a first conditioned analog machine signal;

a second signal conditioning circuit for receiving and conditioning the analog machine sensor signal from the machine sensor to produce a second conditioned analog machine signal;

a first data processor mounted in the protective housing for receiving the first conditioned analog machine signal from the first signal conditioning circuit and processing the first conditioned analog machine signal to produce a first set of desired digital machine data;

a second data processor mounted in the protective housing for receiving the second conditioned analog machine signal from the second signal conditioning circuit and processing the second conditioned analog machine signal to produce a second set of desired digital machine data;

a keyboard interfaced with the first and second data processors for inputting commands and data to the first and second data processors;

a digital memory interfaced with the first and second data processors and for storing information; and

a display interfaced with the first and second data processors for visually displaying information to the user.