Process Optimisation: Notching Automation for Spacecraft Payload under Sine Response

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Process Optimisation: Notching Automation for Spacecraft Payload under Sine Response

  1. 1. Process Optimisation: NotchingAutomation for SpacecraftPayload under Sine Response8-9 Nov. 2011Antonio Di CarloEngineer R&D
  2. 2. Process Optimisation: Notching Automation forSpacecraft Payload under Sine ResponseF. Mouriaux ; A. Di CarloRUAG Space ZürichSchaffhauserstrasse 580CH-8052 ZürichTel.:+00 41 44 306 22 11AbstractNotching is a well known topic in the design of space structures, both at spacecraft and at equipment level.The aim of notching is to reduce the input during qualification sine vibration tests in order not to exceedeither the maximum quasi-static interface loads at the shaker interface (primary notching) and/or to limitthe response of some of the internal parts of the test item (secondary notching). The notched input profilesused for the qualification testing need to be approved, prior to the test, by the launching authority after acoupled load analysis.For spacecraft structures, the notching process is a complicated exercise involving a lot of equipment unitswithin the spacecraft and different notching criteria which can differ from one unit to the other.This presentation gives an overview on the HyperWorks notching tool developed by RUAG Space andALTAIR Engineering in the frame of the Small Geo programme, a geostationary spacecraft platform forcommercial application.RUAG Group company, Antonio Di Carlo 2 8-9.11.2011
  3. 3. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response INTRODUCTION What is notching? Notching is the limitation of the input during the sine qualification test Primary notching Primary notching is the limitation based on the forces and moments at the interface to the launcher Secondary notching With secondary notching, the input at the launcher interface is limited in order not to exceed the specific Unit qualification envelope. Secondary notching applies on top of the primary notching REMARK The notched input profile used for the qualification testing needs to be approved, prior to the test, by the launching authority through a coupled load analysis.RUAG Group company, Antonio Di Carlo 3 8-9.11.2011
  4. 4. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response PROBLEM DEFINITIONPrimary notching based on multiple launchers (Ariane 5, Atlas, Soyuz, Proton, Sea Launch…)Multiple secondary notching criteria  Acceleration: Limitation of the acceleration of a specific point of a Unit (identified by a FEM node).  Individual I/F Force: Limitation of the reaction force or moment at a specific interface point of a Unit.  Resultant I/F Force: Limitation of the resulting force or moment at the mounting plane of a Unit.Different types of secondary notching criteria can be applicable simultaneously to a Unit.Large number of Units (electronic boxes, tanks, antennas, solar arrays, reflectors…).Large number of data due to the nature of the analysis  sine response with high sampling rate to cover individual modes  consideration of amplitude and phase informationRUAG Group company, Antonio Di Carlo 4 8-9.11.2011
  5. 5. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response Typical Unit Acceleration Qualification Envelope to be used for secondary notchingRUAG Group company, Antonio Di Carlo 5 8-9.11.2011
  6. 6. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response Typical Unit Force Qualification Envelope to be used for secondary notchingRUAG Group company, Antonio Di Carlo 6 8-9.11.2011
  7. 7. Process Optimisation: Notching Automation for Spacecraft Payload under Sine Response  IMPLEMENTATION IN HYPERWORKS Dedicated GUIDefinition of the folders containing launcher and equipmentdata (csv files) RUAG Group company, Antonio Di Carlo 7 8-9.11.2011
  8. 8. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUI Definition of the launcher input data:  Nominal Sine Input  Quasi-Static Accelerations  Angle StepsRUAG Group company, Antonio Di Carlo 8 8-9.11.2011
  9. 9. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUI Definition of the equipment allowable data:  Sine Qualification Level  Node Range  Unit Mounting PlaneRUAG Group company, Antonio Di Carlo 9 8-9.11.2011
  10. 10. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUI Definition of the launchers to be evaluated. At the end an envelope input profile is providedRUAG Group company, Antonio Di Carlo 10 8-9.11.2011
  11. 11. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUI Definition of the NASTRAN Input files (f06 and pch) Definition of the file to store the envelope profileRUAG Group company, Antonio Di Carlo 11 8-9.11.2011
  12. 12. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUIRUAG Group company, Antonio Di Carlo 12 8-9.11.2011
  13. 13. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response IMPLEMENTATION IN HYPERWORKSDedicated GUIRUAG Group company, Antonio Di Carlo 13 8-9.11.2011
  14. 14. Process Optimisation: Notching Automation forSpacecraft Payload under Sine ResponseCONCLUSION Automation and standardisation of the notching process Improvement of process robustness and efficiency Quick assessment of the System performance Easy reporting (direct export of curves to Word document)RUAG Group company, Antonio Di Carlo 14 8-9.11.2011
  15. 15. Process Optimisation: Notching Automation forSpacecraft Payload under Sine Response AKNOWLEDGMENTSudhir Padaki Project Engineer Aero ALTAIR Engineering (Product Design)Ramona Schwarz Senior Software Engineer ALTAIR Engineering (Product Design)RUAG Group company, Antonio Di Carlo 15 8-9.11.2011
  16. 16. Thank you for your attention!RUAG Group company, Antonio Di Carlo 16 8-9.11.2011

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