PhD, technical sciences Virchenko G.A.
Gryaznova
G.P.
PERSPECTIVES OF USING OF STRUCTURAL
PARAMETRICAL METHODOLOGY FOR MODELLING IN MODERN COMPUTER AIDED DESIGN SYSTEMS
Nowadays most of
the manufactures have a possibility to choose convenient CAD/CAM/CAE
(Computer-Aided Design /Computer-Aided Manufacturing /Computer-Aided
Engineering)-products [1] from the wide range of domestic and foreign
Computer-Aided Design Systems (CADS) depending on posed problem, scale of
production output and economic feasibility.
Along with
technical parameters and characteristics selection process of certain CADS
software package based on many other factors:
- current company “standards” at the specific
industry;
- computer systems used by key partners;
- possibility of software supplier to realize
of effective support of CADS and its future
development;
- and so on.
Large engineering enterprises, for instance, of shipbuilding, aviation and other industries, as a rule, focus on utilization of various (heterogeneous) CADS for design of every separate group of mechanisms, blocks or devices etc.
As high-level software such multimodular software packages as CATIA, CADDS, Pro/ENGINEER and the others are often used for modeling of complicated cabinet surfaces, engineering communications, pipelines and cable systems.
Separate blocks design could be held by middle and low-level-software such as SolidWorks, Autodesk Inventor, ÊÎÌÏÀÑ, AutoCAD and others.
Besides 3D-modelling systems like Autodesk Inventor Professional and SolidWorks are used also for comprehensive analyzes of projected constructions. In particular, it refers to consideration of strength, kinematic and dynamic calculations and other aspects.
Support of data
exchange format STEP allows combination of objects designed by different CADS
software.
Despite the fact that up to 90% details and spare parts of the new assembly unit could be completed from existing design libraries of standard and unified products, computer-aided design still remains a time-consuming task.
Applying of
various CADS could also complicate design process of complex product consisting
of blocks of different purpose and topology.
In connection
with this the problem of finding of optimal methods of geometrical modelling of products with
CAD/CAM/CAE-systems remains an urgent task for the most industries.
Overwhelming
number of up-to-date CADS has an option
of parametric representation of a product in design. In particular, the latest
version of CATIA offers so called “soft parameterization”. It allows work with
“hard” as well as flexible parametric models. SolidWorks, ÊÎÌÏÀÑ-3D and the other packages support the similar options.
Since shape and dimensions of details are linked into the unified system, it is obviously appropriate to use structural parametric geometrical modelling methodology as the one of scientific directions of applied geometry and engineering graphics [2] for the complex optimization of constructions.
Computer
geometrical model building means creation of object’s mathematical description
for its (object) definition and subsequent modification.
At that every geometrical component is considered as defined ordered set of separate elements. Thus, investigated object could be the potential part of a more complicated system.
The mentioned approach of a structural parametric modelling is applicable to the multivariate hierarchical structure of any difficulty that may include not only combination of objects, but also combination of processes.
Since design documentation creation always
precedes a development of the production cycle for manufacturing an article,
the way of creation of optimal model can be extended and supplemented with
facts that take into consideration indicators of subsequent technological
processing, resolving by that of existing problem of fragmentation of design
and technological tasks.
Despite the fact that the complexity of parametric system increases after the entering of new elements, as a result, in accordance with its abilities and goals manufacturer obtains full optimized cycle of unit construction and manufacturing.
Thus, the search
and introduction of new methods of geometric modelling in modern computer
systems is actual task for improving quality and reducing the cost of
production processes on modern enterprises.
Literature:
1. Lee, K., 2004,
“CAD system foundation (CAD/CAM/CAE)”, S-Pb.: Peter, 560p.
2. Vanin, V. V., Virchenko, G. A., “Definition and main
regulations of structural parametrical geometrical modelling”,
Geometrical and computer modelling, 2009, Issue 23, Kharkiv: KHDUKHT, pp.
42-48.