The establishment of knowledge base and the decision-making method of thread connection type selection The decision-making methods of thread connection type selection are divided into three types: logic decision, calculation decision and creative decision. The system adopts the logic decision-making method, that is, according to the deterministic knowledge widely recognized by people, the corresponding decision rules are established and stored in the knowledge base, and the decision is realized by using conventional procedures and logical reasoning. The most commonly used logic decision representation and implementation methods are decision trees and decision tables. The system uses a decision tree. A decision tree is a way of describing or specifying a condition associated with a result, that is, a decision relationship used to indicate "if (condition), then (action)". The decision tree consists of nodes and branches, the condition is placed at the branch of the tree, the action is placed on the result point of each branch, and the result of the decision is placed on the endpoint.
Thread diameter and length determination After the thread type is determined (that is, after the national label is determined), in this type of threaded fastener, the diameter of the thread with different nominal diameters is calculated from small to large, until the strength requirement is met. The last selected diameter is the nominal diameter to be determined. The nominal length is then calculated from its nominal diameter and the material of the coupled member (or the thickness of the joined member) and rounded to a standard length value.
Standard Parts Table Output This system has established a thread fastener table and can save the thread standard parts selected for this design according to user requirements. At the same time, according to the user's requirements, it can output the thread fastener table according to the country's label, diameter, length and other fields, which greatly facilitates the purchase of fasteners.
4 Conclusion
Threaded CAD design system developed with AutoCAD2000 as the development platform, secondary development tools such as Object ARX and Visual C++ 6.0, and object-oriented graphic database programming technology. It is practical and efficient, easy to use, and realizes thread connection (including type selection, Fully automated design of parameter determination, intensity calculation, automatic generation of graphics, integration of standard parts table sorting output, etc.)
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In the clinical medical experiments usinghuman venous blood as specimensome take the serum from the specimen as the experimental object.The blood collection tubes suitable for this type of medical tests are called serum blood collection tube.
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