Implementation in SimEvents

• SimEvents:
  • Simulink blockset for discrete event modeling
  • transaction-based (flow of entities through components)
  • components e. g.
    
    • entity generator, server, queue
    • several routing blocks
    • basic Conveyor System
• Model of conveyor for dry bulk material:
  • 
  • ports
    • input and output for entities
    • inputs for incoming and outgoing velocity
    • output for display of outgoing entities
  • parameters
    • conveyor length l
    • compartment length l_E
  • mass of entities as attribute
  • subsystem RefillBinst handles adaptation of differing velocities
  • standard component ConveyorSystem implements transport delay
• Implementation of RefillBins component:
  • 
  • incoming entities
    • enter server callFunc
    • → calls Simulink function totalMass to compute m_acc
    • → calls Simulink function setPartialMass to compute m_p
    • are destroyed afterwards
  • InternalGenerator creates new entities at times n ∆t₂
    • sends them to server getValue
    • → calls Simulink function compMass to compute m_out
  • entity leaves the block
    • → copy is created and sent back to input server
    • → its mass is subtracted from m_acc
• Handling of concurrent events:
  • important, when incoming and outgoing times coincide
  • incoming entity has to be processed first
  • implemented using priorities
  • strange behaviour of SimEvents
    • priority only affects events and messages, not internal function calls
    • makes additional server getValue necessary