Mission Description

0265-EX-CR-2018 Text Documents

California Polytechnic State University

2018-06-05ELS_210704

DAVE  (CP7)  –  California  Polytechnic  State  University  –  1U         The  Damping  and  Vibration  Experiment  (DAVE)  CubeSat  implements  a  payload  to   evaluate  a  mechanical  damping  technology  in  microgravity.  This  technology,  called   particle  damping,  exploits  the  dynamics  of  multiple  constrained  particles  to   dissipate  vibration  energy.  Terrestrial  applications  demonstrate  particle  damping   performance  to  be  largely  unaffected  by  extreme  environments  yet  simple  and   cheap  to  implement.  This  feature  set  makes  particle  damping  an  attractive   technology  for  applications  in  spacecraft,  where  dampers  are  needed  to  steady   sensitive  instrumentation  and  inhibit  destructive  structural  resonant  modes.     In  orbit,  DAVE  provides  a  low  cost  and  low  risk  platform  to  characterize  unknown   particle  damper  microgravity  behavior  and  provide  flight  heritage  for  particle   damper  technology.  The  completion  of  these  objectives  overcomes  barriers   currently  inhibiting  the  employment  of  particle  dampers  in  space.     DAVE  is  equipped  with  one  OmniVision  imager.    The  primary  purpose  of  the  imager   is  verifying  the  rotation  rates  of  the  spacecraft  prior  to  performing  experiments.     The  secondary  mission  is  acquiring  Earth  imagery  to  support  public  outreach   activities.       After  deployment  from  the  P-­‐POD,  the  satellite  will  power  on.  Approximately  15   minutes  later,  antenna  deployment  will  occur.  115  minutes  after  antenna   deployment,  the  beacon  will  be  activated  and  the  satellite  will  be  available  to   acquire  with  the  ground  station.    A  full  parameter  sweep  vibration  experiment  will   begin  automatically  within  a  few  hours  of  launch.    Results  will  be  downloaded  over   subsequent  passes.    Additional  experiments  can  be  commanded  from  the  ground  as   necessary  to  improve  confidence  in  the  results.     The  structure  is  made  entirely  of  6061-­‐T6  Aluminum.  The  antenna  is  made  of  NiTi   and  Delrin.  The  ceramic  piezo  electric  beam  actuators  are  lead  zirconate  titanate.     The  tips  of  the  booms  contain  tungsten  particles.    The  satellite  contains  mostly   standard  commercial  off  the  shelf  materials,  electrical  components,  PCBs,  and  solar   cells.  

  There  are  no  pressure  vessels,  hazardous  materials,  or  exotic  materials.    The  cavities   containing  the  tungsten  particles  are  not  freely  vented.     There  are  2x  UL  listed  3.6V  4000mAh  Lithium-­‐Ion  26650  batteries  connected  in   parallel.  The  UL  listing  number  is  MH61586.  There  is  battery  protection  circuitry   and  over-­‐charge  protection.      


Document Created: 0310-12-19 00:00:00
Document Modified: 0310-12-19 00:00:00
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