Data acquisition device for balancing rotating components of large machinery

• US 4,977,516 A
• Filed: 08/14/1989
• Issued: 12/11/1990
• Est. Priority Date: 04/10/1987
• Status: Expired due to Fees

• Current Assignee: Shepherd, James E.
• Original Assignee: Shepherd, James E.
• Inventors: Shepherd, James E.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Mattson, Brian M.
• Application Number:
  US07/393,850
• Time in Patent Office: 484 Days
• Field of Search: 364/505, 364/506, 364/508, 364/550, 364/494, 340/683, 73/570, 73/593, 73/649, 73/658, 73/660
• US Class Current: 700/279
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00

Abstract

A device analyzes vibration-related problems in large rotating machinery which has the capability to receive input simultaneously from a plurality of vibration sensors. A microprocessor stores and processes the data collected, which is output as a value for the amplitude and phase of vibration at each location where a sensor is placed. The device includes communications capabilities which permit the collected data to be transmitted to a remote location for analysis.

Claims

1. A data acquisition device for collecting data concerning vibration of a rotating component which rotates through a cycle, said data acquisitiond device being operable over a plurality of cycles, and responsive to changes in angular velocity of the rotating component, comprising:

(a) means for generating a first periodic interrupt signal which occurs at least once per cycle;

(b) means for dividing the period of each cycle of the rotating component into a plurality of equal time increments selected by a user, said dividing means including adjustment means for varying said time increments from cycle to cycle depending upon changes in the angular velocity of the rotating component;

(c) means for generating a second periodic interrupt signal for each time increment of each cycle;

(d) a plurality of vibration sensors mounted at spaced locations on the rotating component for detecting vibrations in the rotating component and producing an output signal representative of the vibration at the location of the sensors, wherein vibrations are monitored at a pluraliy of said locations simultaneously;

(e) a signal processor having a plurality of input channels for receiving output signals from respective vibration sensors;

(f) input means forming a part of the signal processor and responsive to the first and second periodic interrupt signals for receiving output signals from a plurality of the vibration sensors in response to each such periodic interrupt signal; and

(g) means for digitizing and storing said output signals for subsequent processing.

2. The data acquisition device accoding to claim 1, wherein the means for varying said time increments includes means for measuring the period of the cycle preceding the current cycle and dividing said period by the selected number of time increments for the current cycle.

3. A method for collecting data relating to vibrations of a rotating component which rotates throug a cycle comprising:

(a) generating a first periodic interrupt signal at least once per cycle;

(b) dividing each cycle of the rotating component into a plurality of equal time increments;

(c) varying the time increments from cycle to cycle depending upon changes in angular velocity of the rotating component;

(d) generating a second periodic interrupt signal for each time increment of each cycle;

(e) mounting a plurality of vibration sensors at different locations along the rotating component fo detecting vibration and producing an output signal representative of the vibration at the locations of the sensors;

(f) monitoring the vibration of the rotating component at a plurality of said locations simultaneously;

(g) transmitting output signals from a plurality of the vibration sensors to a signal processor in response to each interrupt signal; and

(h) storing the output signals in a memory device in the signal processor.

4. The method according to claim 3, wherein the step of varying the time increment from cycle to cycle includes:

measuring a period of the cycle preceding a current cycle; and

dividing said period by a desired number of increments for the current cycle.

5. A data acquisition device for collecting data concerning vibration of a rotating component which rotates through a cycle, said data acquisition device being operable over a plurality of cycles and responsive to changes in angular velocity of the rotating component, comprising:

(a) menas for dividing a period of eahc cycle into a plurality of equal time increments and producing a periodic interrupt signal at completion of each such time increment;

(b) means for adjusting the time increment from cycle to cycle depending upon changes in the angular velocity of the rotating component, said adjustment means including;

(1) means for determining the period of each cycle; and

(2) means for dividing the period of a most recently completed cycle by a selected number of increments to establish a time interval for the next cycle;

(c) a plurality of vibration sensors moutned at spaced locations on the rotating component for detecting vibrations in the rotating component and producing an output signal representative of the vibration at the location of the sensors, wherein vibrations are monitored at a plurality of said locations simultaneously;

(d) a signal processor having a plurality of input channels for receiving output signals from respective vibration sensors;

(e) input means forming a part of the signal processor and responsive to the periodic interrupt signal for receiving output signals from a plurality of the vibration sensors in response to each such interrupt signal; and

(f) means for digitizing and storing said output signals for subsequent processing.