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Rose-Hulman EM 406 - Modal Analysis of Power Harvesting Host Structure

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Modal Analysis of Power Harvesting Host StructureJohn McFarlandTracy Van ZandtDon WangMentor: Phil CornwellESA-WRJune 25, 20041This presentation will cover the modal testing and subsequent data analysisPerformed modal test on the host structureAnimated the mode shapes using ME’scopeExtracted 9 modes in the 0-70 Hz range2Roving hammer impact test used to determine the natural modes of the structureNatural Modes of Host StructureDesign and location of auxilary structureImprove Power Harvesting5 ftAir bearings63 impact locations7 reference accelerometers (1V/g)3Data collected using 8-channel Spectrabook and RT Pro SB SoftwareLines 400 Points 1024Freq 150 deltaT 2.7 msInput Power SpectrumLarge, soft-tip hammerExponential Force Window4Frequency response data analyzed using ME’scope742 FRF measurementsExtracted 9 modes from 1 to 70 HzUsed last year’s modal analysis to help find the natural frequencies5ME’scope used to animate mode shapesResponse in vertical direction applied to all points on legNo data taken in the horizontal plane6Rigid body modes of the structureRigid body motion along Y axisMode 23.1 HzMode 410.8 HzRigid body twistingRigid body motion along Z axisMode 37.8 Hz7Twisting and bending modes1stTorsionMode 523.7 Hz1stBending in the Y and Z directionsMode 633 Hz1stBending in the X and Z directionsMode 850 Hz8Conclusion: modal analysis of host structure enables optimization of tuned auxiliary structurePerformed experimental modal analysisDetermined first 9 modes of the systemOptimize tuned auxiliary structureGoal9Comparison with last year’s resultsLast Year This yearMode # Freq (Hz) Mode Shape1 2.1 1.4 Rigid X2 2.75 3.1 Rigid Y3 7.82 7.82 Rigid Z*4 11.8 10.8 Rigid rotation5 13.9 2ndRigid X6 23.5 23.7 1stTorsion7 29.6 33 1stBending Y8 38.2 40.5 2ndBending Y9 46 50 1stBending X10 65.5 69.1 2ndBending X11 70.2


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Rose-Hulman EM 406 - Modal Analysis of Power Harvesting Host Structure

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