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A process architecture for increased parameterization in the solid modeling and design of aircraft wing and empennage structural assemblies and parts
A process architecture for increased parameterization in the solid modeling and design of aircraft wing and empennage structural assemblies and parts
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机译：在飞机机翼和尾翼结构组件和零件的实体建模和设计中增加参数化的过程架构
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摘要
pA Process Architecture for Increased Parameterization in the Solid Modeling and Design of Aircraft Wing and Empennage structural assemblies and parts. Abstract Design involves human effort, often demanding the incorporation of changes. So this human effort plus the changes result in another considerable effort. But if the Design is represented by a set of parameters then the change merely means changing the values of the parameters. So the proposed method keeps the Design heritage intact and lets the Design intent alone do the talking. In the process, meanwhile, a human element (in the guise of parameters) is lent to an otherwise complex scenario: which can be further utilized in the selection, change and optimization of the system. THE METHODOLOGY The topology is divided into two spaces: Top Design (TD) & Detail Design (DD). Further, there is an identity element (ID) made common to the both. The novelty comes with the idea of a further classification inside the spaces of TD and DD. Three kinds of objects were defined: (1)Elements Xj (which are nothing but the lines and curves in the Sketcher), (2)Relations fj (which are constraints between the x,'s forced by the Designer), and (3)Analysis objects kr (typically objects with full 3-D data). The parameterization is achieved by an implementation of the relation: f(x) = k, ...fj being commutative and associative. This means, the operations on x/s are not dependent on the sequence of their creation, unlike the feature based modeling where the sequence of the features is important. In this way, new x( 's can be added or deleted at any later time, or the fj's values be changed, without any difficulty. This in practical terms means rapid incorporation of design changes. All design decisions are represented by fj's, whereas the kr's are derived from x/s and f/s by the use of features such as extrude, trim, revolve, booleans, etc, without invoking any design decision on the part of the Designer. For example, in the 'extrude' operation the parameters are: 'start-value' and 'end-value'; but here these values are not important and can be put a sufficiently large number (in the feature based modeling, however, these two parameters are usually design driven parameters). Further, the ID file contains relevant kr's from the TD. The ID (the 'node') makes these objects available to the DD files by the use of proper file-structure. In this way the TD drives top-down changes into the DD. Moreover, at the TD or DD level, the presence of all parameters in the Sketcher alone, makes it easy to identify and change the relevant parameters./p
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