id sid tid token lemma pos sb397655n92 1 1 a a DET sb397655n92 1 2 common common ADJ sb397655n92 1 3 cause cause NOUN sb397655n92 1 4 of of ADP sb397655n92 1 5 aircraft aircraft NOUN sb397655n92 1 6 engine engine NOUN sb397655n92 1 7 failure failure NOUN sb397655n92 1 8 is be AUX sb397655n92 1 9 the the DET sb397655n92 1 10 high high ADJ sb397655n92 1 11 cycle cycle NOUN sb397655n92 1 12 fatigue fatigue NOUN sb397655n92 1 13 of of ADP sb397655n92 1 14 engine engine NOUN sb397655n92 1 15 blades blade NOUN sb397655n92 1 16 and and CCONJ sb397655n92 1 17 stators stator NOUN sb397655n92 1 18 . . PUNCT sb397655n92 2 1 one one NUM sb397655n92 2 2 of of ADP sb397655n92 2 3 the the DET sb397655n92 2 4 primary primary ADJ sb397655n92 2 5 causes cause NOUN sb397655n92 2 6 of of ADP sb397655n92 2 7 these these DET sb397655n92 2 8 failures failure NOUN sb397655n92 2 9 is be AUX sb397655n92 2 10 due due ADJ sb397655n92 2 11 to to ADP sb397655n92 2 12 blade blade NOUN sb397655n92 2 13 row row NOUN sb397655n92 2 14 interactions interaction NOUN sb397655n92 2 15 , , PUNCT sb397655n92 2 16 which which PRON sb397655n92 2 17 cause cause VERB sb397655n92 2 18 an an DET sb397655n92 2 19 aerodynamic aerodynamic ADJ sb397655n92 2 20 excitation excitation NOUN sb397655n92 2 21 to to PART sb397655n92 2 22 be be AUX sb397655n92 2 23 resonant resonant ADJ sb397655n92 2 24 with with ADP sb397655n92 2 25 a a DET sb397655n92 2 26 mechanical mechanical ADJ sb397655n92 2 27 natural natural ADJ sb397655n92 2 28 frequency frequency NOUN sb397655n92 2 29 . . PUNCT sb397655n92 3 1 traditionally traditionally ADV sb397655n92 3 2 , , PUNCT sb397655n92 3 3 the the DET sb397655n92 3 4 primary primary ADJ sb397655n92 3 5 source source NOUN sb397655n92 3 6 of of ADP sb397655n92 3 7 such such ADJ sb397655n92 3 8 aerodynamic aerodynamic ADJ sb397655n92 3 9 excitations excitation NOUN sb397655n92 3 10 has have AUX sb397655n92 3 11 been be AUX sb397655n92 3 12 practically practically ADV sb397655n92 3 13 limited limited ADJ sb397655n92 3 14 to to ADP sb397655n92 3 15 viscous viscous ADJ sb397655n92 3 16 wakes wake NOUN sb397655n92 3 17 from from ADP sb397655n92 3 18 upstream upstream ADJ sb397655n92 3 19 components component NOUN sb397655n92 3 20 . . PUNCT sb397655n92 4 1 however however ADV sb397655n92 4 2 , , PUNCT sb397655n92 4 3 more more ADV sb397655n92 4 4 advanced advanced ADJ sb397655n92 4 5 designs design NOUN sb397655n92 4 6 require require VERB sb397655n92 4 7 that that SCONJ sb397655n92 4 8 blade blade NOUN sb397655n92 4 9 rows row NOUN sb397655n92 4 10 be be AUX sb397655n92 4 11 very very ADV sb397655n92 4 12 highly highly ADV sb397655n92 4 13 loaded loaded ADJ sb397655n92 4 14 and and CCONJ sb397655n92 4 15 closely closely ADV sb397655n92 4 16 spaced space VERB sb397655n92 4 17 . . PUNCT sb397655n92 5 1 this this DET sb397655n92 5 2 results result NOUN sb397655n92 5 3 in in ADP sb397655n92 5 4 aerodynamic aerodynamic ADJ sb397655n92 5 5 excitation excitation NOUN sb397655n92 5 6 from from ADP sb397655n92 5 7 potential potential ADJ sb397655n92 5 8 fields field NOUN sb397655n92 5 9 of of ADP sb397655n92 5 10 downstream downstream ADJ sb397655n92 5 11 engine engine NOUN sb397655n92 5 12 components component NOUN sb397655n92 5 13 , , PUNCT sb397655n92 5 14 in in ADP sb397655n92 5 15 addition addition NOUN sb397655n92 5 16 to to ADP sb397655n92 5 17 the the DET sb397655n92 5 18 known know VERB sb397655n92 5 19 wake wake NOUN sb397655n92 5 20 excitations excitation NOUN sb397655n92 5 21 . . PUNCT sb397655n92 6 1 an an DET sb397655n92 6 2 experimental experimental ADJ sb397655n92 6 3 investigation investigation NOUN sb397655n92 6 4 of of ADP sb397655n92 6 5 the the DET sb397655n92 6 6 potential potential ADJ sb397655n92 6 7 field field NOUN sb397655n92 6 8 from from ADP sb397655n92 6 9 the the DET sb397655n92 6 10 fan fan NOUN sb397655n92 6 11 of of ADP sb397655n92 6 12 a a DET sb397655n92 6 13 honeywell honeywell PROPN sb397655n92 6 14 f109 f109 PROPN sb397655n92 6 15 turbofan turbofan NOUN sb397655n92 6 16 engine engine NOUN sb397655n92 6 17 has have AUX sb397655n92 6 18 been be AUX sb397655n92 6 19 completed complete VERB sb397655n92 6 20 . . PUNCT sb397655n92 7 1 the the DET sb397655n92 7 2 investigation investigation NOUN sb397655n92 7 3 included include VERB sb397655n92 7 4 velocity velocity NOUN sb397655n92 7 5 measurements measurement NOUN sb397655n92 7 6 upstream upstream ADV sb397655n92 7 7 of of ADP sb397655n92 7 8 the the DET sb397655n92 7 9 fan fan NOUN sb397655n92 7 10 , , PUNCT sb397655n92 7 11 addition addition NOUN sb397655n92 7 12 of of ADP sb397655n92 7 13 an an DET sb397655n92 7 14 airfoil airfoil NOUN sb397655n92 7 15 shaped shape VERB sb397655n92 7 16 probe probe NOUN sb397655n92 7 17 upstream upstream ADV sb397655n92 7 18 of of ADP sb397655n92 7 19 the the DET sb397655n92 7 20 fan fan NOUN sb397655n92 7 21 on on ADP sb397655n92 7 22 which which PRON sb397655n92 7 23 surface surface NOUN sb397655n92 7 24 pressure pressure NOUN sb397655n92 7 25 measurements measurement NOUN sb397655n92 7 26 were be AUX sb397655n92 7 27 acquired acquire VERB sb397655n92 7 28 , , PUNCT sb397655n92 7 29 and and CCONJ sb397655n92 7 30 measurement measurement NOUN sb397655n92 7 31 of of ADP sb397655n92 7 32 the the DET sb397655n92 7 33 velocity velocity NOUN sb397655n92 7 34 in in ADP sb397655n92 7 35 the the DET sb397655n92 7 36 interaction interaction NOUN sb397655n92 7 37 region region NOUN sb397655n92 7 38 between between ADP sb397655n92 7 39 the the DET sb397655n92 7 40 probe probe NOUN sb397655n92 7 41 and and CCONJ sb397655n92 7 42 the the DET sb397655n92 7 43 fan fan NOUN sb397655n92 7 44 . . PUNCT sb397655n92 8 1 this this DET sb397655n92 8 2 investigation investigation NOUN sb397655n92 8 3 sought seek VERB sb397655n92 8 4 to to PART sb397655n92 8 5 characterize characterize VERB sb397655n92 8 6 the the DET sb397655n92 8 7 response response NOUN sb397655n92 8 8 on on ADP sb397655n92 8 9 the the DET sb397655n92 8 10 upstream upstream ADJ sb397655n92 8 11 probe probe NOUN sb397655n92 8 12 due due ADP sb397655n92 8 13 to to ADP sb397655n92 8 14 the the DET sb397655n92 8 15 fan fan NOUN sb397655n92 8 16 potential potential ADJ sb397655n92 8 17 field field NOUN sb397655n92 8 18 and and CCONJ sb397655n92 8 19 the the DET sb397655n92 8 20 interaction interaction NOUN sb397655n92 8 21 between between ADP sb397655n92 8 22 a a DET sb397655n92 8 23 viscous viscous ADJ sb397655n92 8 24 wake wake NOUN sb397655n92 8 25 and and CCONJ sb397655n92 8 26 the the DET sb397655n92 8 27 potential potential ADJ sb397655n92 8 28 field field NOUN sb397655n92 8 29 ; ; PUNCT sb397655n92 8 30 as as SCONJ sb397655n92 8 31 such such ADJ sb397655n92 8 32 , , PUNCT sb397655n92 8 33 all all DET sb397655n92 8 34 test test NOUN sb397655n92 8 35 conditions condition NOUN sb397655n92 8 36 were be AUX sb397655n92 8 37 for for ADP sb397655n92 8 38 subsonic subsonic ADJ sb397655n92 8 39 fan fan NOUN sb397655n92 8 40 speeds speed NOUN sb397655n92 8 41 . . PUNCT sb397655n92 9 1 the the DET sb397655n92 9 2 results result NOUN sb397655n92 9 3 from from ADP sb397655n92 9 4 the the DET sb397655n92 9 5 collected collected ADJ sb397655n92 9 6 data datum NOUN sb397655n92 9 7 show show VERB sb397655n92 9 8 that that SCONJ sb397655n92 9 9 fan fan NOUN sb397655n92 9 10 - - PUNCT sb397655n92 9 11 induced induce VERB sb397655n92 9 12 potential potential ADJ sb397655n92 9 13 disturbances disturbance NOUN sb397655n92 9 14 propagate propagate VERB sb397655n92 9 15 upstream upstream ADV sb397655n92 9 16 at at ADP sb397655n92 9 17 acoustic acoustic ADJ sb397655n92 9 18 velocities velocity NOUN sb397655n92 9 19 , , PUNCT sb397655n92 9 20 to to PART sb397655n92 9 21 produce produce VERB sb397655n92 9 22 vane vane NOUN sb397655n92 9 23 surface surface NOUN sb397655n92 9 24 - - PUNCT sb397655n92 9 25 pressure pressure NOUN sb397655n92 9 26 amplitudes amplitude NOUN sb397655n92 9 27 as as ADV sb397655n92 9 28 high high ADJ sb397655n92 9 29 as as ADP sb397655n92 9 30 $ $ SYM sb397655n92 9 31 40 40 NUM sb397655n92 9 32 $ $ SYM sb397655n92 9 33 percent percent NOUN sb397655n92 9 34 of of ADP sb397655n92 9 35 the the DET sb397655n92 9 36 inlet inlet ADJ sb397655n92 9 37 , , PUNCT sb397655n92 9 38 mean mean VERB sb397655n92 9 39 total total ADJ sb397655n92 9 40 pressure pressure NOUN sb397655n92 9 41 . . PUNCT sb397655n92 10 1 further far ADV sb397655n92 10 2 , , PUNCT sb397655n92 10 3 these these DET sb397655n92 10 4 fan fan NOUN sb397655n92 10 5 - - PUNCT sb397655n92 10 6 induced induce VERB sb397655n92 10 7 pressure pressure NOUN sb397655n92 10 8 amplitudes amplitude NOUN sb397655n92 10 9 display display VERB sb397655n92 10 10 large large ADJ sb397655n92 10 11 variations variation NOUN sb397655n92 10 12 between between ADP sb397655n92 10 13 the the DET sb397655n92 10 14 two two NUM sb397655n92 10 15 vane vane NOUN sb397655n92 10 16 surfaces surface NOUN sb397655n92 10 17 . . PUNCT sb397655n92 11 1 an an DET sb397655n92 11 2 argument argument NOUN sb397655n92 11 3 is be AUX sb397655n92 11 4 made make VERB sb397655n92 11 5 that that SCONJ sb397655n92 11 6 the the DET sb397655n92 11 7 structure structure NOUN sb397655n92 11 8 of of ADP sb397655n92 11 9 the the DET sb397655n92 11 10 pressure pressure NOUN sb397655n92 11 11 response response NOUN sb397655n92 11 12 is be AUX sb397655n92 11 13 consistent consistent ADJ sb397655n92 11 14 with with ADP sb397655n92 11 15 the the DET sb397655n92 11 16 presence presence NOUN sb397655n92 11 17 of of ADP sb397655n92 11 18 two two NUM sb397655n92 11 19 distinct distinct ADJ sb397655n92 11 20 sources source NOUN sb397655n92 11 21 of of ADP sb397655n92 11 22 unsteady unsteady ADJ sb397655n92 11 23 forcing force VERB sb397655n92 11 24 disturbances disturbance NOUN sb397655n92 11 25 . . PUNCT sb397655n92 12 1 the the DET sb397655n92 12 2 disturbances disturbance NOUN sb397655n92 12 3 on on ADP sb397655n92 12 4 the the DET sb397655n92 12 5 incoming incoming ADJ sb397655n92 12 6 - - PUNCT sb397655n92 12 7 rotation rotation NOUN sb397655n92 12 8 - - PUNCT sb397655n92 12 9 facing face VERB sb397655n92 12 10 surface surface NOUN sb397655n92 12 11 of of ADP sb397655n92 12 12 the the DET sb397655n92 12 13 igv igv NOUN sb397655n92 12 14 propagated propagate VERB sb397655n92 12 15 upstream upstream ADV sb397655n92 12 16 at at ADP sb397655n92 12 17 a a DET sb397655n92 12 18 different different ADJ sb397655n92 12 19 speed speed NOUN sb397655n92 12 20 than than ADP sb397655n92 12 21 those those PRON sb397655n92 12 22 on on ADP sb397655n92 12 23 the the DET sb397655n92 12 24 outgoing outgoing ADJ sb397655n92 12 25 - - PUNCT sb397655n92 12 26 rotation rotation NOUN sb397655n92 12 27 - - PUNCT sb397655n92 12 28 facing face VERB sb397655n92 12 29 surface surface NOUN sb397655n92 12 30 , , PUNCT sb397655n92 12 31 indicating indicate VERB sb397655n92 12 32 that that SCONJ sb397655n92 12 33 one one NUM sb397655n92 12 34 originated originate VERB sb397655n92 12 35 from from ADP sb397655n92 12 36 a a DET sb397655n92 12 37 rotating rotate VERB sb397655n92 12 38 source source NOUN sb397655n92 12 39 and and CCONJ sb397655n92 12 40 the the DET sb397655n92 12 41 other other ADJ sb397655n92 12 42 from from ADP sb397655n92 12 43 a a DET sb397655n92 12 44 stationary stationary ADJ sb397655n92 12 45 source source NOUN sb397655n92 12 46 . . PUNCT sb397655n92 13 1 an an DET sb397655n92 13 2 argument argument NOUN sb397655n92 13 3 is be AUX sb397655n92 13 4 made make VERB sb397655n92 13 5 to to PART sb397655n92 13 6 suggest suggest VERB sb397655n92 13 7 that that SCONJ sb397655n92 13 8 the the DET sb397655n92 13 9 stationary stationary ADJ sb397655n92 13 10 source source NOUN sb397655n92 13 11 is be AUX sb397655n92 13 12 due due ADJ sb397655n92 13 13 to to ADP sb397655n92 13 14 the the DET sb397655n92 13 15 rotor rotor NOUN sb397655n92 13 16 blades blade NOUN sb397655n92 13 17 cutting cut VERB sb397655n92 13 18 through through ADP sb397655n92 13 19 the the DET sb397655n92 13 20 wake wake NOUN sb397655n92 13 21 of of ADP sb397655n92 13 22 the the DET sb397655n92 13 23 igv igv PROPN sb397655n92 13 24 . . PUNCT