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Table 1 Natural frequencies of the clean wing and wing with engine nacelle

From: Predicting wing-pylon-nacelle configuration flutter characteristics using adaptive continuation method

#

Mode Frequencies (Nastran)

With Engine Nacelle JSM_enp Model (Hz)

Clean Wing JSM_c Model (Hz)

1

1st bending

1.366

1.1381

2

2nd bending

6.732

6.437

3

1st torsion

12.603

10.768

4

3rd bending

15.356

16.335

5

Nacelle pitching

2.528

-

6

Nacelle rolling

4.446

-