Parameter turns the design application in 2 dimension CAD

The mathematical means that is based on geometric constraint uses dimension tie to establish equation group, geometric constraint change is a series of what be argument with diagnostic dot is nonlinear equation group, to given tie, be worth methodological Jie Fei through number linear equation group, solution gives the coordinate value that all features nod, give geometrical detail certainly. Use this method to must be inputted sufficient and consistent dimension tie, ability begs solution to restrain equation group. ⑵ .

Be based on the development of the artificial intelligence of artificial intelligence method of geometrical inference, promoted parameter to change the development that devises a method, produced geometrical organon. This kind of method has two sides again: It is to build the base in expert system, use predicate to express geometric constraint, give geometrical detail through inferential machine control and guide. This kind of method can examine the rationality of geometric constraint model can be handled local revise, but the system is huge, right recursive the tie cannot be handled. 2 it is patulous and existing data structure, make its include develop to attack information, arrive from geometric constraint through program implementation the inference of geometrical detail. ⑶ .

The feature of hypostatic modelling method that is based on a feature offers as the kind that takes architect intent, in order to replace the kind with the composition of a picture of basic geometry element such as linear, circular arc, circle. Diagnostic substance has certain wisdom, they not only have clear craft feature structure, and the functional attribute that can remember oneself from beginning to end and as hypostatic related to other suiting concern. Modification some feature is hypostatic, can cause the relevant change of whole design model automatically, the physical quantity that includes hypostatic itself among them (wait for data like centroid and inertial quadrature) change. For example, aperture feature can remember his current figure, position and negative volume feature from beginning to end, the craft feature that mechanical design division can use him to be familiar with (be like aperture, horn, round etc) , the body always organization on meaning of pure geometry of and rather than designs an intent, make the design becomes easy. ⑷ .

Company of German Xi Menzi puts forward the method building a model that is based on a relation turns a model with parameter of construction of relation data structure above all. Inside the system, the relation can be built between object of place system level-headed, also can build aleatoric and complex relation model in the model with large random, of this kind of relation establishing a procedure is in order to accord with what stylist design is used to, the means of very handy nature undertakes. Of relation model build can undertake modification differring in order to suit conveniently the special requirement of the user, raise design rate greatly thereby. ⑸ .

Be based on project of law of constructive and auxiliary line to design personnel to be when design plot, often draw a few datum line first, call auxiliary line, set out by auxiliary line one step by step plot, first draw the outline of is overall outline, make the scale that refines processing to finish blueprint again next. The system reachs geometric constraint the method such as vectorgraph, the parameter that establishs project blueprint interactively changes a model to go up, implementation changes a design to the parameter of aleatoric dimension. 2, the CAD system that parameter changes plot overview to contain parameter to change design function has certain and marked characteristic on design plot admittedly, if do not need process designing to be able to realize graphical parameter to change, modification graph reachs his to go to the lavatory, workload is small, and can make formal plan by draft. However, when spare parts structure very complex reach when appearance is extremely irregular, parameter changes a design to appear ability not equal to one's ambition. Change a design at parameter for distinction, application advanced language process designing makes specific figure realizes parameter to change call parameter to transform plot (Parameric Drawing) , plot is transformed in parameter in, the partial dimension in the graph (or full measure) dimension of the parameter that be by item definition, after alternant input joins numerical value, can draw a graph. Parameter transforms plot realize specific figure parameter to change through process designing, because this asks the architect has process designing capacity, existence workload is big, the problem such as modification graph inconvenience. But its application is agile, get used to a face wide. To certain applying parameter turns the problem that design system cannot solve, the method that can use parameter to transform plot normally tries to solve, when the CAD system that developing certain machine for example, requirement design, computation, when checking unifinication of watch, plot, the method that suits to use parameter to transform plot apparently tries to solve. Through process designing implementation parameter transforms plot, the overall train of thought of its programming is: In blending in design calculative relation the program, below the control of the program, executive computation and alternant input are main parameter, the program should undertake to parameter input effectiveness examines, finish the scale of view according to the alternant input of the user. 3, typical parameter changes design system seventies end, gossard of American Masschusetts Institute of Technology teachs the parameter that put forward him to change design mind, but his advocacy is in CAD domain was not caused at that time take seriously, till company of PTC of the United States end 1987 (Parametric Technology Corporation) rolled out change with parameter, after the Pro/Engineer of software of modelling of new generation substance that diagnostic design is a foundation, CAD domain just realises parameter turns the vast power of the design truly. And door subsidiary puts forward Germany on the west the first time the design goes out from the depart in producing a course, will reduce product part amount through standardization, seriation " rationalize project " thought, make have parameter to change the CAD system that designs a function, farther the first time the design comes out from the depart in producing a course, shorten effectively the design is periodic, raise manufacturing efficiency and economic benefits. Now a lot of famous CAD systems (be like UG - II, I - DEAS, applicon, CV, euclid) already all increased parameter to change design function. Application changes a system at the typical parameter on the PC is AutoCAD Designer, Sigraph - Desghn and GS - ZDDS. 2 dimension parameter changes the AutoCAD Designer of company of Autodesk of United States of 　 of ⒈ AutoCAD Designer design software is to be based on diagnostic parameter to convert design software, it moves at AutoCAD platform in, use the alternant interface that agrees with its, master in order to facilitate user study is mixed. It makes can careless draw gives mechanical design division the 2 dimension figure that has whole dimension tie. In draw the outline of when 2 dimension draft, architect need not arrest at exact measure numerical value, so that can first exert oneself is designed at the function of component and structure, the mechanism that can use dimension to restrain after that comes normative draft. But because the core technology of AutoCAD platform does not have parameter to change,design a technology, bring about AutoCAD Designer 2 dimension parameter changes design software to existing on application a variety of factors that affect plot rate, in the meantime, adroitness of the person that build parameter to change respect of library of standard spare parts to need to use masters the programming language of software of concerned AutoCAD base and skill, cloggy of this software gain ground. AutoCAD Designer can generate each automatically to be tagged to 2 dimension view and full measure by three-dimensional feature substance according to the architect's need, dimension is revised in either view, all can update the appearance of diagnostic substance and physical attribute automatically, and also can pass each automatically to be tagged to view and its dimension to the feature is revised hypostaticly. The newest version of AutoCAD Designer provided more driving design function, if have the assembly of dimension tie,examination of diagnostic modelling, interference, list is generated, the comprehensive management that assembles structure of model correlation change, product and component relation. These advanced parameter change diagnostic substance to generate and revise a method of structure and its brachylogy, make AutoCAD Designer becomes PC use at engineering design respect on platform the CAD software of the richest competition ability. ⒉ Sigraph - Sigraph of Desghn 　 　 - desghn2 dimension parameter converts design software is German Xi Menzi (Siemens) the company rolls out be based on intelligence relation parameter changes design system. Structure of data of this system core is relation data structure, the relation can be in the system can identify build between all objects, be like the connection between graph element, the correspondence between view concerns, design formula and the mutual correspondence that design expression concern, the correspondence between assembly drawing and part drawing concerns, the motion between the spare parts is contacted. Concern to convey these, sigraph - the tool such as the geometrical connection variable that Desghn offerred stylist to be familiar with very much and cent type, form, through using these tools integratedly, the knowledge that the design requires and tie can obtain sufficient expression and processing inside the computer. Sigraph - Desghn is system of expert mechanical design CAD, offerred for the user build commonly used change graph library function with standard component parameter, support designs structural design from the concept, design hardware design from the component. It still includes the following function: The two-way drive of graph and dimension, but the user element that parameter changes, classification first step controls type layer function, visibility and object-oriented structured icon interface. Sigraph - Desghn was reflected adequately " rationalize project " thought. ⒊ GS - GS of ICAD 　 　 - ICAD parameter changes system of 2 dimension mapping is short for Zhejiang Province greatly the is based on means of constructive and auxiliary line to combine structure of geometric constraint, hypostatic modelling, relation data and artificial intelligence to wait for partial theory parameter that day information limited company rolls out changes design system, it moves on platform of foundation of NT of Windows 9x ／ , use icon to change, the statement is complete Chinese change and online help, make the design commands a structure simple, intelligence changes rate tall, operation is natural fluent, interface structure of friendly, whole is beautiful and lavish, facilitating user study, master with the operation. The architect is being designed (draw the outline of) when draft of 2 dimension project, but not stick to the dimension accuracy at the graph, use navigation function of the system, undertake the function of product component and structure are designed well and truly, the principle that restrains with dimension finally comes normative to draft draft, form complete parameter to change blueprint of 2 dimension project and different design plan. It is an enterprise come true or reflect " rationalize project " one of main tools of the thought. GS - ICAD is system of CAD of a professional mechanical design, it offerred parameter to change standard component to the user graph library and all sorts of symbol libraries, open the function that build a warehouse to the user, support designs particular structure design from product idea, design hardware design from the component. CNC Milling CNC Machining