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General description | Detailed description | Results Presentation

Results Presentation

Stage 1

Studies Regarding:

  • Theoretical aspects of the acoustic enclosures simulation and modeling STRAERO
  • Sound transmission theory UPB
  • Fuselage design principles ROMAERO
  • Legislation regarding noise measurements INCDT COMOTI
  • CRequirements for certain types of airplane GECI
  • Quality assurance requirements in aeronautical industry ROMAERO

Stage 2

  • Fuselage panel project, taking into account the applicable requirements conceptual model
  • 2 mathematical model for acoustic transmission phenomena thru the fuselage panel conceptual model

Stage 3

  • Fixing frame for the fuselage panel in the specific test bench conceptual model
  • Assembly device project for the fuselage panel conceptual model
  • Assembly device for the fuselage panel functional model
  • Mathematical model for acoustic transmission phenomena thru the fuselage panel conceptual model

Stage 4

  • Fixing frame for the fuselage panel in the specific test bench functional model

Stage 5

  • Fuselage panel execution

  • Reverberation time evaluation

  • Central model removal

  • Measurement of sound pressure level only with the fixing panel

  • Measurement of sound pressure level with the fuselage panel in position

Emission room -- Reception room

f [Hz]

L1 [dB]

L2 [dB]

L1-L2[dB]

100 86,0 72,6 13,4
125 89,2 79,3 9,9
160 93,1 82,8 10,3
200 93,2 80,8 12,4
250 93,5 79,9 13,6
315 93,5 79,0 14,5
400 93,9 79,6 14,3
500 93,1 78,7 14,4
630 92,0 77,4 14,7
800 92,0 74,4 17,6
1 k 91,9 73,5 18,4
1.25 k 93,1 73,8 19,3
1.6 k 94,6 73,9 20,7
2 k 94,8 72,7 22,1
2.5 k 94,8 70,0 24,8
3.15 k 96,1 69,9 26,2
4 k 96,0 67,9 28.1
5k 89,5 59,3 30,3

  • Obtained results

  • Evaluation of airborne sound insulation

    f [Hz]

    R [dB]

    100 9,6
    125 8,3
    160 8,5
    200 13,0
    250 14,0
    315 14,6
    400 14,7
    500 15,8
    630 15,8
    800 18,7
    1 k 19,1
    1.25 k 19,9
    1.6 k 20,8
    2 k 22,5
    2.5 k 24,9
    3.15 k 26,0

Rw [dB] 20

General description | Detailed description | Results Presentation
 

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