Analysis of Payload Assembly Frame for WAB Suspension
"Explore how various stiffening options impact the natural frequencies of a payload assembly frame designed for WAB suspension. Results show potential improvements with anchors and stiffeners, but further modifications are needed to meet required frequency specifications."
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Presentation Transcript
Motivation To determine if the payload assembly frame is stiff enough to hold the WAB suspension, natural frequencies of the frame was calculated and some stiffening options were explored to meet the 100Hz of requirement. 2
Analysis model Total of four cases were calculated. WAB suspension dummy mass 3kg stiffener Z X Y Case4 Anchored Case2 Case1 Bare model Case3 Partially reinforced Fully reinforced 3
Analysis conditions -Contact condition all mating surfaces are bonded -Load condition no load -Constraint condition four interface points are fixed in six DOF fixed 4
Results Natural frequency and mode shape Case1 Case2 Case3 Case4 Mode No. 1st 24 / Global 37 / Global 59 / Global 64 / Local 2nd 26 / Global 40 / Global 64 / Local 84 / Local 3rd 44 / Global 78 / Global 88 / Local 88 / Local 4th 68 / Global 87 / Local 88 / Local 88 / Local 5th 80 / Global 88 / Local 107 / Global 122 / Local 6th 119 / Global 100 / Global See backup slides for detail. 5
Summary - - Payload assembly frame was not stiff enough to hold the WAB suspension. X shaped stiffeners worked nicely but the 1stmode frequency is still way below 100Hz of requirement. In Case4, adding anchor to the basement greatly helped to improve the frequency. Local vibration modes below 100Hz can be eliminated with minor modification. We may also need to discuss if we can put such a stiffeners while maintaining an accessibility to the payload. - - 6
Backup (Case1) 1st24Hz 2nd26Hz 3rd44Hz 4th68Hz 5th80Hz 6th119Hz 7
Backup (Case2) 1st37Hz 2nd40Hz 3rd78Hz 4th87Hz 5th88Hz 6th100Hz 8
Backup (Case3) 1st59Hz 2nd64Hz 3rd88Hz 4th88Hz 5th107Hz 9
Backup (Case4) 1st64Hz 2nd84Hz 3rd88Hz 4th88Hz 5th122Hz 10
