System for predicting life of a rotary machine, method for predicting life of a manufacturing apparatus which uses a rotary machine and a manufacturing apparatus

• US 6,898,551 B2
• Filed: 04/18/2003
• Issued: 05/24/2005
• Est. Priority Date: 09/30/2002
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamamoto, Akihito, Nakao, Takashi, Samata, Shuichi, Furuhata, Takeo, Ushiku, Yukihiro
• Primary Examiner(s): Bui, Bryan
• Application Number:
  US10/418,275
• Publication Number:
  US 20040064291A1
• Time in Patent Office: 767 Days
• Field of Search: 702/141, 702/145, 702/147, 702/33, 702/34, 702/56, 702/76, 702/77, 702/182, 702/183, 702/185, 702/190, 736/60
• US Class Current: 702/182
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G05B 23/0229 knowledge based, e.g. expert systems; genetic algorithms
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A system for predicting life of a rotary machine, includes a vibration gauge configured to measure time series data of a peak acceleration of the rotary machine; a band pass filter configured to filter an analog signal of the time series data of the peak acceleration measured by the vibration gauge in a frequency band including a first analysis frequency expressed as a product of an equation including a number of rotor blades of the rotary machine and a normal frequency unique to the rotary machine; and a data processing unit configured to predict a life span of the rotary machine by characteristics of the filtered analog data of the time series data of the peak acceleration with the first analysis frequency.

Claims

1. A system for predicting life of a rotary machine, comprising:

a vibration gauge configured to measure time series data of a peak acceleration of the rotary machine;

a band pass filter configured to filter an analog signal of the time series data of the peak acceleration measured by the vibration gauge in a frequency band including a first analysis frequency expressed as a product of an equation including a number of rotor blades of the rotary machine and a normal frequency unique to the rotary machine, the equation expressed as [n+(l/m)], where m is the number of rotor blades, and n, l are arbitrary positive integers; and

a data processing unit configured to predict a life span of the rotary machine by characteristics of the filtered analog data of the time series data of the peak acceleration with the first analysis frequency.

2. The system of claim 1, wherein the frequency band is set in a bandwidth of approximately 2 to 10 times a sum of a half bandwidth of the peak acceleration and a maximum variation of the peak frequency.

3. The system of claim 1, wherein a measurement time interval of the vibration measured by the vibration gauge is equal to or less than one third of a period of the first analysis frequency.

4. The system of claim 1, further comprising:

another band pass filter configured to filter the analog signal of the time series data of the peak acceleration in another frequency band including a second analysis frequency being different in a variation phase of the peak acceleration from the first analysis frequency.

5. A method for predicting life of a manufacturing apparatus using a rotary machine, comprising:

measuring time series data of a peak acceleration of the rotary machine;

filtering an analog signal of the time series data of the peak acceleration measured by the vibration gauge in a frequency band including a first analysis frequency expressed as a product of an equation including a number of rotor blades of the rotary machine and a normal frequency unique to the rotary machine, the equation expressed as [n+(I/m)], where m is the number of rotor blades, and n, l are arbitrary positive integers; and

predicting a life span of the rotary machine by characteristics of the filtered analog data of the time series data of the peak acceleration with the first analysis frequency.

6. The method of claim 5, wherein the frequency band is set in a bandwidth of approximately 2 to 10 times a sum of a half bandwidth of the peak acceleration and a maximum variation of the peak frequency.

7. The method of claim 5, wherein the time series data of the peak acceleration is measured by a time interval equal to or less than one third of a period of the first analysis frequency.

8. The method of claim 5, further comprising:

filtering the analog signal of the time series data of the peak acceleration in another frequency band including a second analysis frequency being different in a variation phase of the peak acceleration from the first analysis frequency.

9. A manufacturing apparatus comprising:

a rotary machine;

a vibration gauge configured to measure time series data of a peak acceleration of the rotary machine;

a band pass filter configured to filter an analog signal of the time series data of the peak acceleration measured by the vibration gauge in a frequency band including a first analysis frequency expressed as a product of an equation including a number of rotor blades of the rotary machine and a normal frequency unique to the rotary machine, the equation expressed as [n+(l/m)], where m is the number of rotor blades, and n, l are arbitrary positive; and

a data processing unit configured to predict a life span of the rotary machine by characteristics of the filtered analog data of the time series data of the peak acceleration with the first analysis frequency.

10. The manufacturing apparatus of claim 9, wherein the frequency band is set in a bandwidth of approximately 2 to 10 times a sum of a half bandwidth of the peak acceleration and a maximum variation of the peak frequency.

11. The manufacturing apparatus of claim 9, wherein a measurement time interval of the vibration measured by the vibration gauge is equal to or less than one third of a period of the first analysis frequency.

12. The manufacturing apparatus of claim 9, further comprising:

another band pass filter configured to filter the analog signal of the time series data of the peak acceleration in another frequency band including a second analysis frequency being different in a variation phase of the peak acceleration from the first analysis frequency.