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VIBRATION OF A BOX PANEL BEM

Analyzing vibration modes and eigenvalues of a box panel with varying thickness, identifying noise contributors and frequencies.

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VIBRATION OF A BOX PANEL BEM

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  1. VIBRATION OF A BOX PANEL BEM Panels of Varying Thickness Prescribed motion displacement

  2. Y1 surface Z1 surface X1 surface

  3. Prescribed motion in X direction only(displacement)

  4. Modal Frequencies Box Panel |------ frequency -----| MODE EIGENVALUE RADIANS CYCLES PERIOD 1 2.871812E+02 1.694642E+01 2.697107E+00 3.707677E-01 2 4.988071E+02 2.233399E+01 3.554565E+00 2.813284E-01 3 7.727191E+02 2.779783E+01 4.424161E+00 2.260315E-01 4 1.501808E+03 3.875317E+01 6.167759E+00 1.621334E-01 5 1.632331E+03 4.040211E+01 6.430196E+00 1.555163E-01 6 2.075580E+03 4.555854E+01 7.250867E+00 1.379146E-01 7 2.602766E+03 5.101731E+01 8.119657E+00 1.231579E-01 8 2.887857E+03 5.373878E+01 8.552793E+00 1.169209E-01 9 3.355013E+03 5.792247E+01 9.218648E+00 1.084758E-01 10 3.473548E+03 5.893681E+01 9.380085E+00 1.066088E-01 11 4.117317E+03 6.416632E+01 1.021239E+01 9.792030E-02 12 4.627150E+03 6.802316E+01 1.082622E+01 9.236833E-02 13 4.886561E+03 6.990394E+01 1.112556E+01 8.988314E-02 14 5.079631E+03 7.127153E+01 1.134322E+01 8.815842E-02 15 5.627496E+03 7.501663E+01 1.193927E+01 8.375723E-02 16 5.687220E+03 7.541366E+01 1.200246E+01 8.331628E-02 17 6.192881E+03 7.869486E+01 1.252468E+01 7.984238E-02 18 6.661664E+03 8.161902E+01 1.299007E+01 7.698188E-02 19 7.675920E+03 8.761233E+01 1.394394E+01 7.171577E-02 20 8.130169E+03 9.016745E+01 1.435060E+01 6.968352E-02 21 8.788604E+03 9.374755E+01 1.492039E+01 6.702239E-02 22 9.092576E+03 9.535500E+01 1.517622E+01 6.589256E-02 23 9.275712E+03 9.631050E+01 1.532829E+01 6.523884E-02 24 1.013600E+04 1.006777E+02 1.602335E+01 6.240891E-02 25 1.041560E+04 1.020568E+02 1.624285E+01 6.156555E-02 26 1.160306E+04 1.077175E+02 1.714377E+01 5.833021E-02 27 1.259114E+04 1.122102E+02 1.785881E+01 5.599476E-02 28 1.288281E+04 1.135024E+02 1.806448E+01 5.535727E-02 29 1.358382E+04 1.165496E+02 1.854945E+01 5.390995E-02 30 1.478767E+04 1.216046E+02 1.935397E+01 5.166898E-02 |------ frequency -----| MODE EIGENVALUE RADIANS CYCLES PERIOD 31 1.489398E+04 1.220409E+02 1.942341E+01 5.148425E-02 32 1.566797E+04 1.251718E+02 1.992171E+01 5.019651E-02 33 1.680650E+04 1.296399E+02 2.063283E+01 4.846646E-02 34 1.816798E+04 1.347887E+02 2.145228E+01 4.661509E-02 35 1.851377E+04 1.360653E+02 2.165547E+01 4.617771E-02 36 1.866304E+04 1.366127E+02 2.174259E+01 4.599267E-02 37 2.049267E+04 1.431526E+02 2.278345E+01 4.389151E-02 38 2.130159E+04 1.459506E+02 2.322876E+01 4.305007E-02 39 2.207799E+04 1.485866E+02 2.364830E+01 4.228634E-02 40 2.374664E+04 1.540995E+02 2.452569E+01 4.077357E-02 41 2.391486E+04 1.546443E+02 2.461241E+01 4.062992E-02 42 2.574751E+04 1.604603E+02 2.553805E+01 3.915726E-02 43 2.597176E+04 1.611576E+02 2.564902E+01 3.898784E-02 44 2.694971E+04 1.641637E+02 2.612746E+01 3.827391E-02 45 2.902939E+04 1.703801E+02 2.711684E+01 3.687745E-02 46 3.092217E+04 1.758470E+02 2.798692E+01 3.573097E-02 47 3.207903E+04 1.791062E+02 2.850564E+01 3.508078E-02 48 3.245110E+04 1.801419E+02 2.867047E+01 3.487909E-02 49 3.247906E+04 1.802195E+02 2.868282E+01 3.486407E-02 50 3.374789E+04 1.837060E+02 2.923772E+01 3.420240E-02 51 3.407169E+04 1.845852E+02 2.937765E+01 3.403949E-02 52 3.449804E+04 1.857365E+02 2.956088E+01 3.382849E-02 53 3.662876E+04 1.913864E+02 3.046010E+01 3.282984E-02 54 3.793160E+04 1.947604E+02 3.099707E+01 3.226111E-02 55 3.861533E+04 1.965078E+02 3.127520E+01 3.197422E-02 56 3.972890E+04 1.993211E+02 3.172294E+01 3.152293E-02 57 4.053347E+04 2.013292E+02 3.204255E+01 3.120851E-02 58 4.092619E+04 2.023022E+02 3.219740E+01 3.105841E-02 59 4.096746E+04 2.024042E+02 3.221363E+01 3.104276E-02 60 4.324497E+04 2.079543E+02 3.309695E+01 3.021427E-02

  5. Identifying Panels - Noise and Frequency Contribution eg [A-X1] panel A - X1 surface eg [A-X1] panel A - X1 surface B-X2 F-Z2 E-Z1 E-Z1 D-Y2 D-Y2 A-X1 C-Y1 C-Y1 F-Z2 F-Z2 B-X2 Largest panel contributers to noise A-X1

  6. eg [A-X1] panel A - X1 surface eg [A-X1] panel A - X1 surface eg [A-X1] panel A - X1 surface eg [A-X1] panel A - X1 surface C-Y1 C-Y1 F-Z2 E-Z1 E-Z1 F-Z2 F-Z2 F-Z2 C-Y1 D-Y2 D-Y2 E-Z1

  7. eg [A-X1] panel A - X1 surface E-Z1 C-Y1 E-Z1 D-Y2 F-Z2

  8. Overall SPL at the three field points Forcing frequency 18Hz

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