초록 ▼

A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadban

A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadband signal having frequencies that include the bearing defect peak of the monitored bearing. The broadband signal is analyzed to identify the presence of the bearing defect peak. If the bearing defect peak is present, the amplitude of this peak is quantified to determine whether degradation of the monitored bearing has at least reached a threshold criteria previously established.

대표청구항 ▼

A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadban

A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadband signal having frequencies that include the bearing defect peak of the monitored bearing. The broadband signal is analyzed to identify the presence of the bearing defect peak. If the bearing defect peak is present, the amplitude of this peak is quantified to determine whether degradation of the monitored bearing has at least reached a threshold criteria previously established. lue of an extensional parameter; extracting a rheological data parameter by fitting the approximate value to at least one of a plurality of appropriate models. 41. A computer readable medium having stored therein instructions for causing a central processing unit to execute the method of claim 40. 42. The method of claim 22 wherein the beam of laser light is modulated for at least one of wavelength and intensity. 43. The apparatus of claim 6 wherein at least one of resolution, response time and gain of the laser micrometer can be adjusted. 44. A method for measuring an extensional rheological property of a fluid, comprising: measuring time varying diameter data of a fluid filament; displaying effective extensional viscosity; and further processing the data to determine rheological parameters using a plurality of models, including a model comprising using the diameter data in a non-linear form of an equation having a linear term, an exponential term and an offset term. 45. The method of claim 44 wherein the plurality of models comprise at least one of a Newtonian model, and Maxwell model. 46. The method of claim 44 wherein the step of displaying further comprising displaying diameter and effective elongational viscosities.