• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Workshop - Voorkomen van faling door vibraties - mechanical validation
 

Workshop - Voorkomen van faling door vibraties - mechanical validation

on

  • 182 views

Workshop - Voorkomen van faling door vibraties - mechanical validation

Workshop - Voorkomen van faling door vibraties - mechanical validation

Statistics

Views

Total Views
182
Views on SlideShare
182
Embed Views
0

Actions

Likes
0
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Workshop - Voorkomen van faling door vibraties - mechanical validation Workshop - Voorkomen van faling door vibraties - mechanical validation Presentation Transcript

    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.beWorkshop vibrationvalidation experiments30/05/2013Davy PissoortFilip VanheeBart Boesman
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.beOverview• Two testcases1. Test run @ RMA• Test settings• Comparison to vibration tool2. Second test example• Test of the board• Comparison with results3. Concluding remarks
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be1. Vibration testing – Test @ RMATest settings• Test case:– Bare PCB– 200 x 200 mm²– Clamped at all 4 edges• Classic hammer test:– Board excited on 16 points(4 x 4 matrix) with impulse– Accelerometer mounted onbottom side of the board• Test performed December4th, raw test resultsreceived Jan. 24th• Reference: board III
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be1. Vibration testing – Test @ RMAResults – comparison vibration tool0 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 1, FREQUENCY 191.448025(Hz), DAMPING 0.0483040 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 2, FREQUENCY 401.622890(Hz), DAMPING 0.0076700 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 3, FREQUENCY 409.206762(Hz), DAMPING 0.0059710 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 4, FREQUENCY 606.636062(Hz), DAMPING 0.004998f = 142.388947f = 356.443695 f = 569.177002f = 356.443695
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be1. Vibration testing – Test @ RMAResults – comparison vibration tool0 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 5, FREQUENCY 735.400370(Hz), DAMPING 0.0067500 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 6, FREQUENCY 882.960090(Hz), DAMPING 0.0086000 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 7, FREQUENCY 930.743356(Hz), DAMPING 0.0068670 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 8, FREQUENCY 981.787996(Hz), DAMPING 0.004062f = 713.434509f = 925.060852f = 925.060852
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be1. Vibration testing – Test @ RMAResults – comparison vibration tool0 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 9, FREQUENCY 1187.950178(Hz), DAMPING 0.0051370 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 10, FREQUENCY 1395.286721(Hz), DAMPING 0.0030910 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 11, FREQUENCY 1616.645765(Hz), DAMPING 0.0057700 0.05 0.1 0.15 0.200.050.10.150.2MODE NO. 12, FREQUENCY 1702.813952(Hz), DAMPING 0.010855f = 1212.83252
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be2. Second testcase7mmHeight1 23WidthXYSize: Width=176mm, Height=94mm, Thickness=1.7mm5 point supports:4 corners (center of fixation holes at 5mm from edges)1 in the middle of the plateWeight = 147 gram (without connectors, which are relative light)Heavy components (1-2-3) pulling center of gravity 7 mm to the left, but no clear shift ofcenter of gravity in Y-direction
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be2. Measurements• Goal– Measure resonance of the mechanicalhousing and PCB– Accelerometer positioned in top ofback-cover and 2 on the PCB• Result– Resonance housing ~ 150 Hz– Resonance PCB ~180 Hz
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be2. Model and Parameters31© Sirris | 9The eigenfrenquences are calculated with our Tool , freeFEM software Calculix and AbaqusThe positions of components are not considered for thiscalculationTwo sets of parameters are used for PCB withoutcomponents and PCB with components1. Density=1885kg/m3 , E=22410Mpa, Poisson=0.12 (FR4)2. Equivalent Density=5226kg/m3 , E=22410Mpa, Poisson=0.12 (FR4)
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be2. Simulation Results for the housingFreq. 147.52 245.39 273.04Mode 1 2 3
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be2. Eigen-frequency results with andwithout componentsMode Tool(Hz) Calculix(Hz)Abaqus(Hz) Error %(Tool-Calculix)1 292 278 278 5.03602 352 342 342 2.92403 406 420 420 -3.33334 505 5055 643 644Mode Tool(Hz)Calculix(Hz)Abaqus(Hz)Error %(Tool-Calculix)1 173 165 165 4.4852 209 203 203 2.95573 242 250 250 -3.24 300 3005 383 383Without componentsDensity = 1885 Kg/m3With components:Density = 5226 Kg/m3Measured : 180 Hz
    • Flanders’ Mechatronics Engineering CentreLaboratory for Global Reliability of Electronic Systemshttp://fmec.khbo.be3. Concluding remarks• Experiments @ RMA– The computed eigenfrequencies as well as the modeshapes compare well to the measured ones• Second test example– The housing structure has a resonance frequency ~ 150Hz, which is close to the FEM results of the tool– Resonances of the PCB itself seem to occur at ~ 180 Hz,which is close to simulated lowest frequency (173 Hz)– However, further analysis is needed to discriminate higherharmonics of housing resonance from PCB resonances.