机械学科虚拟实验构件多领域统一建模与组装平台研究

发布时间：2018-04-18 05:32

本文选题：虚拟实验 + 机械学科　；参考：《上海交通大学》2012年硕士论文

【摘要】：机械学科实验教学是机械专业教学重要的教学内容，是使学生在学好基本理论和基本技能的同时，培养学生创新精神和动手能力，提高学生综合素质的重要途径。传统的实物实验教学已经不能满足当前实验教学的需求，为缓解实验器材不足、设备老化等问题，同时还为培养学生的创新能力，机械学科虚拟实验的研究为该问题的解决提供的途径。机械学科实验不单单局限于纯机械领域，相当一部分实验体现了多个领域知识的综合应用。目前广泛使用的虚拟试验建模方法存在建模速度慢，模型局限性强，往往针对特定实验或者特定领域。多领域统一建模方法的研究将有利于虚拟实验平台的推广应用。本文在深入分析多领域统一建模方法以及机械学科虚拟实验现状与不足的基础上，进行了以下研究：首先，通过分析Modelica统一建模语言的特点及其使用方法的基础上，，对机械学科实验进行了归纳，建立了机械学科虚拟实验构件模型并形成构件库，同时分析了构件三维模型与Modelica逻辑模型的内在联系，提出了机械学科实验构件的完整模型表达。其次，通过研究Modelica逻辑模型的特点，提出了利用XML语言统一存储Modelica逻辑模型和三维可视化模型部分信息的数据结构并制定了相应的数据结构规范，提出通过遍历Modelica库并利用Modelica平坦模型获取Modelica模型信息的方法。此外，通过分析场景XML模型结构，提出了将场景XML模型转换成可求解的Modelica模型的方法。为虚拟实验平台、Modelica逻辑模型和三维可视化模型三个独立模块搭建了信息传递的桥梁。再次，通过分析plt结果文件的特点，提出了储存虚拟实验场景求解结果的XML数据格式。通过分析OSG矩阵转换的特点，提出了XML结果数据与场景中构件之间的映射方法，解决了虚拟实验平台的最后一个技术问题。最后，在上述方法与技术研究的基础上，开发了一套机械学科虚拟实验构件多领域统一建模与组装平台，并应用于机械学科虚拟实验中，通过应用示范，验证了本文所述方法的正确性与有效性。
[Abstract]:The experimental teaching of mechanical discipline is an important teaching content of mechanical specialty teaching. It is an important way for students to learn basic theory and skills well, to cultivate students' creative spirit and practical ability, and to improve students' comprehensive quality at the same time.The traditional physical experimental teaching can not meet the needs of the current experimental teaching. In order to alleviate the problems of insufficient experimental equipment, aging of the equipment and so on, it is also necessary to cultivate the students' innovative ability.The research of virtual experiment in mechanical discipline provides a way to solve this problem.Mechanical experiments are not confined to the pure mechanical field. A large number of experiments reflect the comprehensive application of multi-domain knowledge.At present, the widely used virtual experiment modeling method has the characteristics of slow modeling speed and strong model limitation, which is often aimed at specific experiments or specific fields.The research of multi-domain unified modeling method will be beneficial to the popularization and application of virtual experiment platform.Based on the in-depth analysis of the multi-domain unified modeling method and the present situation and shortcomings of the virtual experiment in mechanical discipline, the following studies are carried out in this paper:Firstly, on the basis of analyzing the characteristics of Modelica and its application methods, the experiment of mechanical discipline is summarized, and the component model of virtual experiment of mechanical discipline is established and the component library is formed.At the same time, the relationship between the 3D component model and the Modelica logical model is analyzed, and the complete model representation of the experimental component in mechanical discipline is proposed.Secondly, by studying the characteristics of Modelica logical model, this paper proposes a unified data structure of storing part of information of Modelica logic model and 3D visual model by using XML language and formulates corresponding data structure specification.A method of obtaining Modelica model information by traversing Modelica library and using Modelica flat model is presented.In addition, by analyzing the structure of scene XML model, a method of transforming scene XML model into solvable Modelica model is proposed.A bridge of information transmission is built for the three independent modules of virtual experimental platform, namely, the Modelica logical model and the 3D visualization model.Thirdly, by analyzing the characteristics of plt result file, a XML data format for storing the result of virtual experiment scene is proposed.By analyzing the characteristics of OSG matrix transformation, a mapping method between the XML result data and the components in the scene is proposed, which solves the last technical problem of the virtual experimental platform.Finally, on the basis of the research of the above methods and techniques, a set of multi-domain unified modeling and assembly platform for the virtual experimental components of mechanical discipline is developed, and applied in the virtual experiment of mechanical discipline, through the application demonstration,The correctness and validity of the proposed method are verified.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH11-4;TP391.9

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