Rotor diagnostic and balancing system

• US 4,485,678 A
• Filed: 09/27/1982
• Issued: 12/04/1984
• Est. Priority Date: 09/27/1982
• Status: Expired due to Fees

• Current Assignee: Mechanical Technology Incorporated
• Original Assignee: Mechanical Technology Incorporated
• Inventors: Fanuele, Frank
• Primary Examiner(s): Gill, James J.
• Application Number:
  US06/423,503
• Time in Patent Office: 799 Days
• Field of Search: 73/658, 73/659, 73/660, 364/508
• US Class Current: 73/660
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence

Abstract

A system for rotor diagnostic and trim balancing which includes vibration and rotational sensors coupled to a processor providing outputs thereto whereby the processor is capable of generating a diagnostic output listing the basis and origin of the vibration based upon pre-established standards and if possible effect trim balancing of the rotor.

Claims

1. A method of providing data for use in diagnosing and balancing a rotor, comprising the steps of:

(a) generating vibrational data from a plurality of vibration sensors positioned about a rotor during rotation of the rotor;

(b) generating rotational data from rotational sensors corresponding to the rotation of the rotor;

(c) synchronizing the vibrational data with the rotational data and determine the maximum vibration at respective vibration sensors as the rotor accelerates and decelerates at predetermined intervals;

(d) providing means for comparing the maximum vibrational outputs from the vibration sensors with a predetermined standard to ascertain the probable location of and reason for the vibration sensed;

(e) increasng and decreasing the rotor'"'"'s rotation in a continuous fashion and monitoring the vibrational data for discontinuity of vibrational signals from the vibration sensors;

(f) monitoring the steady state vibrational data as the rotors rotate at predetermined intervals generating a time-to-frequency spectrum of the components of the steady state vibrational data;

(g) extracting from the spectrum the synchronous components thereof which correspond to predetermined critical speeds of the components of the rotor; and

(h) providing means for generating a data output of the probable location and cause of vibrations in the rotor based upon the data obtained in steps d, e, f and g herein.

2. The method in accordance with claim 1 which further includes steps of providing means for determining if said rotor can be trim balanced and if so to determine the corrective weights and locations based upon the data obtained in steps d, e, f and g and predetermined influence coefficients for the particular rotor which are the parameters of the particular rotor which indicates balancing sensitivity.

3. The method in accordance with claim 2 which includes the steps of storing the data output of step h and the influence coefficients in memory.

4. A method of providing data for use in diagnosing and balancing low and high pressure rotors R₁ and R₂ respectively which are interposed between a compressor and turbine of a jet engine and the like comprising the steps of:

(a) generating vibrational data from at least three vibration sensors during rotation of the rotor wherein one sensor is positioned adjacent R₁ '"'"'s compressor side, the second sensor is positioned adjacent R₁ '"'"'s turbine side, and the third sensor is positioned adjacent R₂ and each capable of picking up vibrations in the engine;

(b) generating rotational data from rotational sensors corresponding to the rotation of the rotor, one rotational sensor being capable of monitoring the rotation of R₁, the second rotational sensor being capable of monitoring the rotation of R₂ ;

(c) synchronizing the vibrational data with the rotational data and determine the maximum vibration at respective vibration sensors as the rotors accelerate and decelerate at predetermined intervals;

(d) providing means for comparing the maximum vibrational outputs from the respective vibration sensors with a predetermined standard to ascertain the probable location of and reason for the vibration sensed;

(e) increasing and decreasing the rotors'"'"' rotation in a continuous fashion and monitoring the vibrational data for discontinuity of vibrational signals from the respective vibration sensors;

(f) monitoring the steady state vibrational data as the rotors rotate at predetermined intervals and generating a time-to-frequency spectrum of the components of the steady state vibrational data for the respective vibration sensor;

(g) extracting from the spectrum the synchronous components thereof which correspond to predetermined critical speeds of the components of the rotors; and

(h) providing means for generating a data output of the probable location and cause of vibrations in the rotors based upon the data obtained in steps d, e, f and g herein.

5. The method in accordance with claim 4 which further includes steps of providing means for determining if R₁ can be trim balanced and if so to determine the corrective weights and locations based upon the data obtained in steps d, e, f and g and predetermined influence coefficients for the particular engine, which are the parameters of R₁, which indicate balancing sensitivity.

6. The method in accordance with claim 5 which includes the step of storing the data output of step h and the influence coefficients in memory.