Systems and methods to detect a fluid induced instability condition in a turbomachine

Abstract

A fluid induced instability detection system and method is provided to monitor various vibration characteristics of a turbomachine. The fluid induced instability detection system detects abnormalities in the vibration data and provides an indication of one or more potential faults in the turbomachine.

That which is claimed is: 
     
         1 . A system comprising:
 a turbomachine;   a sensor system coupled to the turbomachine, the sensor system configured to monitor at least two vibration parameters of the turbomachine when the turbomachine is in operation, the at least two vibration parameters comprising a synchronous vibration parameter and a broadband vibration parameter; and   a fluid induced instability detection system configured to receive the at least two vibration parameters from the sensor system, and to use the at least two vibration parameters to detect a change in at least one fluid flow characteristic, the change in the at least one fluid flow characteristic indicative of a fluid induced instability condition in the turbomachine.   
     
     
         2 . The system of  claim 1 , wherein the turbomachine includes fluid film bearings and is at least one of a gas turbine, a steam turbine, a generator, an expander, a fan, a compressor, or a pump. 
     
     
         3 . The system of  claim 1 , wherein the change in the at least one fluid flow characteristic is associated with a lubricating oil flow disturbance. 
     
     
         4 . The system of  claim 3 , wherein the synchronous vibration parameter is associated with a running speed vibration component of the turbomachine, and the broadband vibration parameter is associated with a combination of the running speed vibration component of the turbomachine and at least one additional vibration component of the turbomachine. 
     
     
         5 . The system of  claim 4 , wherein the sensor system includes at least one sensor which senses vibrations associated with the broadband vibration parameter. 
     
     
         6 . The system of  claim 4 , wherein the sensor system is further configured to monitor a speed parameter and a load parameter of the turbomachine when the turbomachine is in operation, and wherein the fluid induced instability detection system is configured to detect the fluid induced instability condition in the turbomachine by detecting at least one of a change in amplitude or a rate change in one or more of the synchronous vibration parameter, the broadband vibration parameter, the speed parameter, or the load parameter. 
     
     
         7 . The system of  claim 6 , wherein detecting the at least one of the change in amplitude or the rate change comprises applying a threshold value to at least one of the synchronous vibration parameter, the broadband vibration parameter, the speed parameter, or the load parameter. 
     
     
         8 . The system of  claim 7 , further comprising:
 a historical database containing historical performance data of the turbomachine, the historical database accessible by the fluid induced instability detection system when detecting the threshold value.   
     
     
         9 . The system of  claim 6 , wherein detecting the at least one of the change in amplitude or the rate change by the fluid induced instability detection system comprises applying a mathematical formula to process at least one combination of two or more of the synchronous vibration parameter, the broadband vibration parameter, the speed parameter, or the load parameter. 
     
     
         10 . A method comprising:
 monitoring at least two vibration parameters of a turbomachine when the turbomachine is in operation, the at least two vibration parameters comprising a synchronous vibration parameter and a broadband vibration parameter; and   using at least the at least two vibration parameters to detect a fluid induced instability condition in the turbomachine.   
     
     
         11 . The method of  claim 10 , wherein the fluid induced instability condition comprises a lubricating oil flow disturbance. 
     
     
         12 . The method of  claim 11 , wherein the synchronous vibration parameter is associated with a running speed vibration component of the turbomachine, and the broadband vibration parameter is associated with a combination of the running speed vibration component of the turbomachine and at least one additional vibration component of the turbomachine. 
     
     
         13 . The method of  claim 11 , further comprising:
 monitoring a speed parameter and a load parameter of the turbomachine when the turbomachine is in operation; and   detecting the fluid induced instability condition in the turbomachine by using at least one of a threshold value or a mathematical formula to detect at least one of an amplitude change or a rate change in one or more of the synchronous vibration parameter, the broadband vibration parameter, the speed parameter, or the load parameter.   
     
     
         14 . The method of  claim 13 , further comprising:
 using an alarm threshold to evaluate the fluid induced instability condition; and   generating an alarm based on evaluating the fluid induced instability condition.   
     
     
         15 . A non-transitory computer-readable storage medium with instructions executable by at least one computer for performing operations comprising:
 receiving from a sensor system, at least two vibration parameters of a turbomachine when the turbomachine is in operation, the at least two vibration parameters comprising a synchronous vibration parameter and a broadband vibration parameter; and   using at least the at least two vibration parameters to detect a fluid induced instability condition in the turbomachine.   
     
     
         16 . The non-transitory computer-readable storage medium of  claim 15  with additional instructions executable by the at least one computer for performing operations comprising:
 receiving from the sensor system, a speed parameter and a load parameter of the turbomachine when the turbomachine is in operation; and 
 detecting the fluid induced instability condition in the turbomachine by using a threshold value to detect at least one of an amplitude change or a rate change in one or more of the speed parameter, the load parameter, or the at least the at least two vibration parameters. 
 
     
     
         17 . The non-transitory computer-readable storage medium of  claim 16  with additional instructions executable by the at least one computer for performing operations comprising:
 using an alarm threshold to evaluate the amplitude change or the rate change; and 
 generating an alarm when at least one of the amplitude change or the rate change exceeds the alarm threshold. 
 
     
     
         18 . The non-transitory computer-readable storage medium of  claim 17  with additional instructions executable by the at least one computer for performing operations comprising:
 using a historical database to detect the alarm threshold. 
 
     
     
         19 . The non-transitory computer-readable storage medium of  claim 15  with additional instructions executable by the at least one computer for performing operations comprising:
 receiving from the sensor system, a speed parameter and a load parameter of the turbomachine when the turbomachine is in operation; and 
 detecting the fluid induced instability condition in the turbomachine by using a mathematical formula to detect at least one of an amplitude change or a rate change in one or more of a synchronous vibration parameter, a broadband vibration parameter, the speed parameter, or the load parameter. 
 
     
     
         20 . The non-transitory computer-readable storage medium of  claim 19 , wherein using the mathematical formula comprises executing at least one of an addition operation, a subtraction operation, a multiplying operation, a division operation, or an integration operation.