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The modern design method of the project of machinery product
and deveolp trend
Abstract:Under the current domestic and foreign scholars for mechanical design
product design at the main thinking, product program design methods into a system, modular structure, the characteristics of knowledge-based products and intelligent four types. That the four methods and the characteristics of the organic inter-linkages, product design efforts Computer direction
Key words:mechanical products; Program design; Trend
INTRODUCTION
The rapid scientific and technological development, product performance requirements of the growing number and complexity of increased life expectancy shortened. updating speed. However, the design of the products, especially machinery products in the design means, it appears powerless, lags behind the needs of the times. At present, computer-aided product design drawings, design, manufacture and production planning has been the subject of extensive and in-depth research and has achieved initial success, and the early stage of product development of computer-aided design program is far from meeting the design requirements. To this end, the author reading a lot of literature on the basis of summary of the design and scholars at home and abroad program design methods used in and discussed the various methods of organic link between the product and machinery design computer trend of development.
Under the current domestic and foreign scholars for mechanical design product design methodology used in the main feature, The program will be of modern design methods summarized as the following four categories.
1．Systematic Design
Systematic design of the main features : design as by a number of design elements of a system, Each element is independence between the various elements of an organic
link, and is layered, all combining elements of the design, system design can be realized for the task
Systematic design in the 1970s by a German scholar Professor Pahl and Beitz. They system theory as a basis to formulate a general model designed to promote the design of rational should have. German Engineers Association in the design on the basis of formulate standards VDI2221 technology systems and product development design methods.
The mechanical product design process model, basically adopted the German standards VDI2221 the design. In addition, Many scholars in China in product design program design and also quoted from other developed systematic design, which is representative ：
(1) The user needs functional characteristics as a product concept, design and structure of parts design, process planning, operational control of the foundation, and the macro-product development process, the use of quality function deployment, System users will demand information reasonably and efficiently converted to the various stages of product development objectives of the technical and operational control in order
(2) The level of organisms as products of life, and the help of life-support systems theory, the product design process can be divided successfully demand levels, realize the concept of functional requirements and the level of product design level. While using the System icon lives abstract expression products to the functional requirements, and form functional product structure.
(3) The mechanical design of science into two basic questions : First, to design the products as a system and to determine the best components (modules) and their mutual relations; Second, the process of product design as a system, based on the design goals, correctly, reasonably ascertain all aspects of design work and the various design stage.
As each of the designers to study issues and consider the perspective of the different emphasis program used in the design of the specific research methods, there are also differences. Below introduced some representative systematic design methods.
1.1 Design Element Method
Used five design elements (functions, effects, effects vector elements and the surface shape parameters) described \five elements value is determined, all the characteristics of the products and eigen value already identified. My design scholars also used a similar method to describe the product's original understanding.
1.2 graphical modeling method
Developed an \， with a clear level of graphic description of the product structure and the function of the abstract information, the realization of the structure, function graphical modeling, and the functional link between the layers
Will be divided into design methods and supporting information exchange 2, Nijssen Information Analysis using methods can be used graphic symbols, with rich semantic model structure, Integration can be described conditions can be classified types of constraints can be achieved between the arbitrary combination of features Will design solutions and information technology integration, and realizing the process of designing different abstraction layers of information between the graphical modeling.
1.3 \
Product design into \is to find, select and mix design tasks required to meet the original understanding. \
The program will be \structure suitable for the design tasks required to meet the original understanding. Functional structure of the sub-function by the \\\functional diagram (mechanical movement schematic). The program \on the functional diagram, first of all qualitative description of the \and \and the Connector (\
Roper, H. Using graph theory, using his definition of \\(VKE)\describes elements of the structure size, location and transmission parameters of the interaction between a number of diagrams, Expert design and intuitive design of a formal description of the formation of the effective application of existing knowledge, will be applied to the \
Design methodology from the point of view of the clear mandate of the design work is divided into three steps Design: 1) Access to function and functional structure (referred to as \(referred to as \describe the conceptual stage machinery products workflow: Strategy 1 : The consideration \various steps were created variant programs, which have an extensive understanding of the original spectrum. Strategy 2: \create the rules) Association, considered in isolation function (usually associated with the design task). At this time, identify typical configuration rules and their effect needs plenty of experience. The program is far less than the spectrum of a strategy program spectrum. Strategy 3: \Applicable to the function and effects of configuration rules and there is no room for