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Modeling and simulation of systems

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Slovak University of Technology Faculty of Material Science and Technology in Trnava Modeling and simulation of systems Input and output rules in Witness – PowerPoint PPT presentation

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Title: Modeling and simulation of systems


1
Modeling and simulation of systems
Slovak University of Technology Faculty of
Material Science and Technology in Trnava
  • Input and output rules in Witness

2
Elementary rules
  • Pull input rule
  • Components are take from elements which are
    arranged into list
  • Pull from element1, element2, element3,...
  • Push output rule
  • Components are sent into element of list which is
    able to accept them
  • Push to element1, element2, element3,...
  • Push to Ship
  • Push to Scrap

3
Usage of input-output rules for element machine
Input rule
Output rule
4
Elementary rules
  • Wait
  • Components will be waiting until they will not be
    entered or pushed out of other element
  • Buffer (capacity)
  • The buffer with defined capacity is added to
    input or output workplace (machine)
  • Buffer(20)

5
Least
  • Least parts
  • Components/Parts enter or get out from element
    with the least number of parts/components
  • Least parts element1, element2, element3,...
  • Least free
  • Parts enter or get out from element the least
    free capacity of parts
  • Least free element1, element2, element3,...

6
Most
  • Most parts
  • Parts enter or get out from Element with the most
    number of parts
  • Most parts element1, element2, element3,...
  • Most free
  • Parts enter or get out from element with the most
    free capacity of parts
  • Most free element1, element2, element3,...

7
Percent
  • Parts enter into or get out from elements on the
    basis of given percentage probability
  • Percent/flow element1 percent1, element2
    percent2,...
  • Percent/145 buffer1 40, rbuffer2 60

8
Sequence
  • Sequence/wait
  • Parts enter or get out from several elements
    (repeatedly). It waits until the condition is
    fulfilled
  • Sequence/wait element1(quantity),
    element2(quantity),...
  • Typical usage - assembly

9
Sequence
  • Sequence/next
  • Parts get out from or enter into several elements
    (repeatedly), but when the condition is not
    fulfilled the next step follows
  • Sequence/next element1(quantity),
    element2(quantity),...
  • Typical usage batch production

10
Sequence
  • Sequence/reset
  • Parts get out from or enter into several elements
    (repeatedly). We wait until all the conditions
    are fulfilled at the same time. If one condition
    is not fulfilled start is from the beginning
  • Sequence/reset element1(quantity),
    element2(quantity),...

11
Match / input rule
  • Match/any
  • Chosen are random parts from the list of elements
  • Match/any element1(quantity), and/or
    element2(quantity),....

12
Match input rule
  • Match/attribute
  • Chosen are those parts which match with specified
    attribute
  • Match/attribute name of attribute
    element1(quantity), and/or element2(quantity),
    ....

13
Match input rule
  • Match/condition
  • Parts are chosen from the element where a
    condition is fulfilled. Generally an element is
    used.
  • Match/condition Xgt3 element1(quantity), and/or
    element2(quantity),....

14
Using Match rule with labor
  • Match/qualifier element1 with the name of worker
    using path (quantity),...

15
Select
  • Parts enter into or get out from the element in
    the list which serial number gains integer
    variable
  • Select on variable element1, element2,...

16
If clause
  • All input and output rules can be conditioned by
    usage of If clause
  • If condition
  • Rule
  • Else
  • Condition
  • endif

17
If clause
  • If condition1
  • Rule
  • Else if condition2
  • Rule
  • Else
  • Rule
  • endif

18
Witness
  • Producer
  • Lanner Group Inc. Great Britain
  • Dealer
  • Humusoft s.ro. Prague, Czech Republic
  • Main usage
  • Witness is set for simulation of production,
    service and logical processes.
  • It is used for the support of decision of leading
    workers at solving of organizational, technical
    and corded problems mainly connected with
    restructuring and refining of company processes.

19
Plug-in modules Witness
  • Optimizer
  • Optimize module proposed with the goal to
    minimize time and effort spent on experimentation
    with the model. It is possible to find optimal
    parameters of watched system by usage of modern
    optimizing methods in the surrounding suitable
    for the user very quickly.

20
Plug-in modules Witness
  • Miner
  • The module for Data Mining analysis . It is
    possible to identify the relations in extensive
    data complex by usage of unique algorithms. Then
    it is possible to use the gained rules for
    judging of systems behaviour. They are also
    available as foundation for arbitration process.

21
Plug-in modules Witness
  • Virtual reality
  • Excellent 3D graphics allows work with the real
    values of elements of watched systems. This
    module is important when it goes for 3D
    orientation or subjective 3D projection.
    Possibility of work with 3D elements created in
    various CAD a VR applications.

22
Plug-in modules Witness
  • Documentor
  • Module determined for creation of well arranged
    documentation of simulation model.
  • Witness Visio
  • Allows to work with simulation models by usage of
    all means which WITNESS provides in the
    surrounding of VISIO program.
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