Portable, self-contained data collection systems and methods

• US 5,808,903 A
• Filed: 09/12/1995
• Issued: 09/15/1998
• Est. Priority Date: 09/12/1995
• Status: Expired due to Term

• Current Assignee: Rockwell Automation, Inc.
• Original Assignee: Entek Scientific Corporation
• Inventors: Schiltz, Richard L., Bates, Andrew J., Watkins, Jeffery P.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): Wachsman, Hal P.
• Application Number:
  US08/526,981
• Time in Patent Office: 1,099 Days
• Field of Search: 364/508, 364/507, 364/566, 364/550, 364/551.01-551.02, 364/576, 364/479.19, 364/709.09, 364/708.1, 364/709.01, 364/413.02-413.06 , 364/709.1, 364/709.11, 73/659, 73/660, 73/602, 73/579, 73/570, 434/266, 128/670, 128/700, 128/715, 128/701, 128/739, 381/51, 381/56, 381/57, 369/64, 369/63, 340/679, 340/680, 340/683, 340/682
• US Class Current: 702/56
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence

Abstract

A portable self-contained data collection system for measuring and collecting vibration data from machines includes an accelerometer which is coupled to the analog input of a data acquisition card. The data acquisition card samples and digitizes the analog signal to produce a time domain digital signal. The data acquisition card output is coupled to a battery-powered portable computer. The battery-powered portable computer includes a database having machine identifications and associated measurement parameters. The portable computer processes the time domain digital signal according to the measurement parameters associated with a selected machine identification, and produces a frequency domain digital signal by performing a Fast Fourier Transform and other digital signal processing operations. The frequency domain signal is also analyzed in the portable computer to produce predictive maintenance information. A power supply for supplying power to the accelerometer is also included. The accelerometer power supply electrically and mechanically couples the accelerometer to the data acquisition card. It supplies power to the accelerometer when the data acquisition card is activated.

Claims

1. A power supply for an accelerometer comprising:

a power supply housing;

an accelerometer battery power supply in said power supply housing, which provides sufficient power for an accelerometer;

output means, for electrically and mechanically connecting said accelerometer battery power supply to an accelerometer external to said power supply housing, and for receiving accelerometer signals from said accelerometer external to said power supply housing;

input means, for electrically and mechanically coupling said accelerometer battery power supply to a portable computer external to said power supply housing, for receiving a control signal from the portable computer external said power supply housing and for providing said accelerometer signals to the portable computer external to said power supply housing;

said accelerometer battery power supply being responsive to said control signal to activate said accelerometer battery power supply to supply power for an accelerometer external to said power supply housing to said output means so that the accelerometer external to the power supply housing is powered by the accelerometer battery power supply instead of by said portable computer external to said power supply housing.

2. A power supply according to claim 1 wherein said accelerometer power supply is responsive to absence of said control signal to deactivate said accelerometer battery power supply.

3. A power supply according to claim 2 wherein said input means provides said accelerometer signals to the portable computer external to said power supply housing notwithstanding absence of said control signal.

4. A power supply according to claim 1 further comprising battery charging means for charging said accelerometer battery power supply.

5. A power supply according to claim 1 wherein said input means comprises means for electrically and mechanically coupling said accelerometer battery power supply to a data acquisition card mechanically and electrically coupled to an expansion slot of the portable computer external to said power supply housing.

6. A power supply according to claim 1 wherein said output means comprises an MS3106 accelerometer connector.

7. A data collection system for measuring and collecting vibration data from machines, said data collection system comprising:

a portable computer including;

a portable computer housing;

a portable computer battery power supply within said portable computer housing to supply power to said portable computer; and

an expansion slot in said portable computer housing;

a data acquisition card mechanically and electrically coupled to said expansion slot; and

an accelerometer power supply including;

a power supply housing;

an accelerometer battery power supply within said power supply housing which provides sufficient power for an accelerometer;

means for electrically and mechanically coupling an accelerometer external to said power supply housing to said accelerometer power supply to convey accelerometer signals produced by the accelerometer external to said power supply housing to said accelerometer power supply and to supply power from said accelerometer battery power supply to the accelerometer external to said power supply housing; and

means for electrically and mechanically coupling said accelerometer power supply to a data acquisition card external to said power supply housing to thereby convey accelerometer signals from the accelerometer power supply to the data acquisition card external to the power supply housing.

8. A data collection system according to claim 7 wherein said portable computer further includes:

a database including a plurality of machine identifications and associated measurement parameters;

user input means for user selection of a machine identification for measurement; and

signal processing means, for processing accelerometer signals according to the measurement parameters associated with the selected machine identification.

9. A data collection system according to claim 8 wherein said portable computer further includes:

signal analyzing means, responsive to said signal processing means, for analyzing the processed signal to produce predictive maintenance information.

10. A data collection system according to claim 9 wherein said signal processing means and said signal analyzing means comprise software modules which execute on said portable computer.

11. A data collection system according to claim 7 wherein said portable computer further includes:

means for transmitting data to a second computer.

12. A data collection system according to claim 7 wherein said accelerometer power supply is responsive to said data acquisition card, for supplying power to an accelerometer when said data acquisition card is activated.