制造系统建模与仿真课件作者苏春第7章节面向制造系统的仿真软件及其应用－ProModel.ppt

Simulation Using Promodel System Definition What is a system? System is a collection of elements that functions together to achieve a desired goal A system consists of multiple elements Elements are interrelated work in cooperation A system exists for achieving specific objectives SYSTEM to ProModel MODEL ProModel Modeling Elements The main elements are: LOCATIONS (object) ENTITIES (object) ARRIVALS (interaction) PROCESSING (interaction) RESOURCES ProModel? - Sequence It is usually easier if you draw a picture / flow chart / etc. It is also usually easier to work backwards ProModel? - Sequence Once a clear picture of what is required is defined, then declare and define the following modules within ProModel: Locations Entities Arrivals Processing Variables … ProModel? - Locations Locations represent fixed places in the system where entities are routed for processing,delay, storage, decision making, or some other activity. some type of receiving locations to hold incoming entities. processing locations where entities have value added to them. ProModel? - Locations Things to define in the Location module found under the “Build” tab: Name Capacity – How many entities at a time Units – How many of this location type DTs – Downtime logic (covered later) Rules – Decision rules (FIFO, random, etc.) Color, size, and layout placement can be done. ProModel? - Entities Anything that a model can process is called an entity. Some examples are parts or widgets in a factory, patients in a hospital, customers in a bank or a grocery store,and travelers calling in for airline reservations. The entities are often also limited in number, depending upon the program type, so creativity may again be required. Entities are discrete units that can be bundled. This aspect is covered later. ProModel? - Entities Things to define in the “Entities” module under the “Build” tab: Name Speed of Travel (default is 150 fpm) Color, size, etc. Attributes are set by a separate module und