... are considered as the small values of O ( ε ) . 21 08 2009 16 04 2010 01 03 2011 01 03 2011 abrasion elastic constants impact (mechanical) lubrication machine bearings mechanical contact mechanical guides nonlinear estimation rotors stators vibration control...

... effective than its original scalogram for the characteristic analysis of the rubbing AE. 07 10 2007 19 05 2008 22 10 2008 abrasion acoustic emission acoustic signal processing elastic waves rotors structural acoustics time-frequency analysis vibrations modal acoustic...

... vibrations turbines rotors abrasion condition monitoring acoustic emissions condition monitoring seal rubbing Rotor-to-stator rubbing is a secondary phenomenon that is usually the result of a mechanism which perturbs the “normal operating conditions” ( 1 ). The primary causes of rubbing...

...-collar or on stabilizers, is prejudicial and leads to premature abrasive wear of the drillstring, reduction of the Rate Of Penetration (ROP) of the tool into the rock and reduction of the Mean Time Between Failure (MTBF). The proposed mathematical model is expressed in terms of four independent degrees...