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Research on Key Technology of Collaborative Design of Large Antenna Structure

Author: LiShen
Tutor: DuanBaoYan
School: Xi'an University of Electronic Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: Collaboration design Product structure tree Dynamic workflow Parameter transmission Data flow Analysis feature Integrated modeling Format description scripts General text document parse Process collaboration
CLC: TN820
Type: PhD thesis
Year: 2013
Downloads: 85
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Abstract


As a kind of mechanical and electrical product, the large antenna developmentprocess (LADP) must utilizing collaborative design technology to integrate hundreds ofdesign links and tasks such as the structure design, electrical properties simulation,servo-control, etc., and to achieve real-time transmission of design state and data for thedemand of higher quality and shorter period. To solve the problem of the design processmodeling difficulty and the data transmission inefficiency in the LSADP, a systematicresearch is made on the collaborative design of large-scale antenna structure in thedissertation, including the dynamic workflow modeling and data integration ofheterogeneous system. The main results and originative work are as follows:(1)Based on product structure tree (PST), a method of dynamic workflow modelingis proposed. Firstly, improving the structure of common PST, the design processinformation was attached to the node of PST. Secondly, dynamic node and abstract nodewere introduced into a workflow template for increasing the model flexibility, and thenthe refinement rules of dynamic node and substitution rules of abstract node wereproposed. Through mapping the components of PTS onto the workflow template, thecomponent instances and their affiliation used as refinement input elements, then thedynamic workflow nodes were refined.(2)A method of data flow modeling for product design process oriented to dataparameter is proposed. In the method, the data parameter (MPara) was defined, whichwas classified as the base data parameters (BDP) and complex data parameters (CDP).The mechanism of mapping relationship between different forms documents and someBDP, and data transmission based on MPara were constructed. Aiming at thecharacteristics of iterative design process, the MPara version mechanism including nodemodification and iteration information was proposed. The MPara transmissionrelationships were represented by MPara net model (PNM) based on directed graph.Finally, through the table of MPara mapping onto the workflow node and PNM, the dataports and data links in data flow model was generated automatically by program.(3)Research on a method of CAD/CAE integrated modeling based on feature.Firstly, the engineering analysis expert’s experience of processing analysis features wasstored in the knowledge repository. Secondly, based on the rule, analysis features wereattached to CAD model of components. Thirdly, geometry information of analysisfeatures is extracted from CAD model and is reconstructed automatically under CAEenvironment. Finally, based on feature-based meshing and combination technique, CAE model is built quickly.(4) A method of data parse in general text document is proposed. A kind of formatdescription scripts (FDS) was proposed, which included three semantics of data block,data line and data parameter. Through implementation the data parsing algorithm, theunified program could extract parameters information from different type textdocuments only inputting the corresponding FDS.(5) Design and implement the prototype system of LAS process collaboration. Themodule structure, system framework and flow design were described in detail.Validation in the actual engineering case of15-meter-diameter S/Ka frequency bandantenna main development process and “Reflector, Back frame and Center part design”data flow model shows that the method can effectively shorten the time of workflowand data flow modeling and improve the data transmission efficiency. The mthod ofCAD/CAE integrated modeling has been used in performance analysis of a7.3-meter-diameter S/X/Ka three frequency band antenna. The method has been provedto be useful for improving speed, accuracy and consistency of complicated structureCAE modeling notably. Two type text documents of Ansys result file and HFSSinformation file have been parsed by the data parsing program, the result shows themethod can parse data from different type text document in unified way.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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