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product_modeling [2011/10/20 23:49]
peter [4. How to specify a product model]
product_modeling [2018/02/15 12:29] (current)
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-===== Product modeling =====+====== Product modeling ​======
 Product modeling is the process of creating a product model of an **individual** product. A product model can be a model of any man made object or natural object. A product model can be a stand-alone model, it can be an element of a model library, or it can an integral part of a [wiki:"​Facility Information Models"​ Facility Information Model]. Product modeling differs from [wiki:"​Knowledge modeling in Gellish"​ knowledge modeling] which aims to develop knowledge models that express knowledge about **kinds** of things. A product model can either be a model of a real world object or a design (a realistic imaginary object). Examples of product models is a design or real piece of equipment, motor, car, or one of its components, such as a bolt, shaft, cable, etc. Also bigger assemblies, such as a buildings, railways, factories or process plants are products. Product modeling is the process of creating a product model of an **individual** product. A product model can be a model of any man made object or natural object. A product model can be a stand-alone model, it can be an element of a model library, or it can an integral part of a [wiki:"​Facility Information Models"​ Facility Information Model]. Product modeling differs from [wiki:"​Knowledge modeling in Gellish"​ knowledge modeling] which aims to develop knowledge models that express knowledge about **kinds** of things. A product model can either be a model of a real world object or a design (a realistic imaginary object). Examples of product models is a design or real piece of equipment, motor, car, or one of its components, such as a bolt, shaft, cable, etc. Also bigger assemblies, such as a buildings, railways, factories or process plants are products.
  
 The design of a product often begins with the fuctional design. Therefore, we will first discuss the definition and the modeling of a function in Gellish English. The design of a product often begins with the fuctional design. Therefore, we will first discuss the definition and the modeling of a function in Gellish English.
-===== 1. Definition of a function =====+====== 1. Definition of a function ​======
 A design process usually begins with a functional specification or the requirements,​ for example as specified in the '​Systems Engineering'​ methodology (see ISO/IEC 15288). \\ A design process usually begins with a functional specification or the requirements,​ for example as specified in the '​Systems Engineering'​ methodology (see ISO/IEC 15288). \\
 Such a functional design specifies a '​function'​ that shall be performed by a new facility or product. The intention of a specification of the function is that the options for a technical solution are kept open. The idea is that in a later stage it shall be specified what the characteristics are of the designed physical object that will performs that function. \\ Such a functional design specifies a '​function'​ that shall be performed by a new facility or product. The intention of a specification of the function is that the options for a technical solution are kept open. The idea is that in a later stage it shall be specified what the characteristics are of the designed physical object that will performs that function. \\
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 A function as used in Systems Engineerig appears to be a process that needs to be performed or enabled. A function as used in Systems Engineerig appears to be a process that needs to be performed or enabled.
-===== 2. Definition of a design =====+====== 2. Definition of a design ​======
 A design process results in a product model of a physical object that will be the performer or enabler of the process (the function). Or more precise: a design is a prdduct model that specifies the composition and characteristics of a realistic imaginary individual physical object that is intended to be realised by a materialised physical object and that is suitable to perform the required function. \\ A design process results in a product model of a physical object that will be the performer or enabler of the process (the function). Or more precise: a design is a prdduct model that specifies the composition and characteristics of a realistic imaginary individual physical object that is intended to be realised by a materialised physical object and that is suitable to perform the required function. \\
 When the facility or product is fabricated it becomes a materialised (realised) physical object, that has characteristics that can be measured and which shall be compliant with the characteristics of the design. When the facility or product is fabricated it becomes a materialised (realised) physical object, that has characteristics that can be measured and which shall be compliant with the characteristics of the design.
  
-===== 3. How to specify a required function =====+====== 3. How to specify a required function ​======
 The above definition of a function implies that a specification of a function in Gellish should start with the definition of the process that needs to be performed. So design of a function means: design of a process (an occurrence). For example, there may be a requirement to clean waste water, which in other words can be expressed as the requirement that we need the function 'waste water cleaning',​ or we may require to transport a number of people. Such a required process is not a process in general, but a particular process with specified input and specified output, by which the required performance of the process is defined. For example, it is required to clean a particular stream of waste water, coming from a particular source, such as the effluent water of a particular plant. That particular waste water stream should have specified properties, whereas the cleaning process will result in a clean water product stream that shall also have specified properties. The quantity and properties of those streams are not properties of the process, as is often specified, but they are properties of the streams that specify the required performance of this particular water cleaning process. The above definition of a function implies that a specification of a function in Gellish should start with the definition of the process that needs to be performed. So design of a function means: design of a process (an occurrence). For example, there may be a requirement to clean waste water, which in other words can be expressed as the requirement that we need the function 'waste water cleaning',​ or we may require to transport a number of people. Such a required process is not a process in general, but a particular process with specified input and specified output, by which the required performance of the process is defined. For example, it is required to clean a particular stream of waste water, coming from a particular source, such as the effluent water of a particular plant. That particular waste water stream should have specified properties, whereas the cleaning process will result in a clean water product stream that shall also have specified properties. The quantity and properties of those streams are not properties of the process, as is often specified, but they are properties of the streams that specify the required performance of this particular water cleaning process.
  
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 Note that UID's above 1000 are selected from the [[:Gellish English Dictionary]]. Lower numbers are user created. The objects 101 through 104 are individual objects that are properly defined by the facts that classify them by a concept (or class) from the Gellish dictionary. However, the concepts with the UID's 105 and 106, waste water stream and clean water stream, do not exist yet in that dictionary. Therefore they should be defined according to the [[:proper definition of a concept|rules for proper definitions of concepts]] and by doing so they become proprietary extensions of the dictionary. In The process can be specified in more detail as is described in the section about [[:Modeling of activities and processes|modeling of activities and processes]]. Note that UID's above 1000 are selected from the [[:Gellish English Dictionary]]. Lower numbers are user created. The objects 101 through 104 are individual objects that are properly defined by the facts that classify them by a concept (or class) from the Gellish dictionary. However, the concepts with the UID's 105 and 106, waste water stream and clean water stream, do not exist yet in that dictionary. Therefore they should be defined according to the [[:proper definition of a concept|rules for proper definitions of concepts]] and by doing so they become proprietary extensions of the dictionary. In The process can be specified in more detail as is described in the section about [[:Modeling of activities and processes|modeling of activities and processes]].
  
-===== 4. How to specify a product model =====+====== 4. How to specify a product model ======
  
 A product model or design consists of a ceherent collection of facts about the product, with a decomposition of the object as its main structure, whereas each component has its own aspects and where documents and drawings may be related to the whole assembly or to the components to describe them. For example, a product model can be as complex as a process plant, or a facility such as a railway system and its components, but it can also be a single device or a simple component. \\ A product model or design consists of a ceherent collection of facts about the product, with a decomposition of the object as its main structure, whereas each component has its own aspects and where documents and drawings may be related to the whole assembly or to the components to describe them. For example, a product model can be as complex as a process plant, or a facility such as a railway system and its components, but it can also be a single device or a simple component. \\
product_modeling.txt ยท Last modified: 2018/02/15 12:29 (external edit)