面向Modelica的多体系统笛卡尔方法建模

发布时间：2018-01-17 02:05

本文关键词：面向Modelica的多体系统笛卡尔方法建模　出处：《华中科技大学》2011年硕士论文　论文类型：学位论文

【摘要】：复杂机电产品通常由多个领域的子系统耦合而成,传统单领域仿真工具无法满足其系统仿真的需求,Modelica多领域统一建模语言能以统一的方式描述不同领域的模型,非常适合此类系统的建模与仿真。机械多体系统仿真是机电产品仿真的重要内容,应该在Modelica建模环境中得到完善的支持,但目前创建Modelica多体模型主要是基于Modelica多体库或使用类似的方法,这些方法建模过程繁琐,创建的模型不够直观,也无法处理冗余约束和初始装配的问题,并且不便于导入ADAMS等主流多体软件的模型。本文针对上述问题进行了研究,提出了一种以三维多体建模工具为建模前端,依据多体系统笛卡尔方法将其生成的物理模型转换为数学模型,再根据Modelica语法规范将该数学模型转换为Modelica表示的方法,并基于该方法实现了Modelica多体系统三维可视化建模系统。主要完成了以下几方面的工作: (1)分析了多体系统物理模型和数学模型,还研究了与多体建模有密切关系的冗余约束消除和初始装配问题。 (2)基于上述研究,提出了一套由多体系统物理模型到数学模型再到最后的Modelica表示的映射技术。 (3)根据所研究的多体物理模型到Modelica表示的映射技术,将多体建模软件InteDyna作为建模前端,设计并实现了Modelica多体三维可视化建模系统。最后,以多领域统一建模仿真平台MWorks为验证工具进行了实例测试,结果表明了所研究的多体物理模型到Modelica表示的映射技术的有效性,以及所设计的Modelica多体三维可视化建模系统的合理性。本文提出的方法为通用的机械结构设计软件的装配模型到多领域环境下的功能模型的转换奠定了基础。
[Abstract]:Complex electromechanical products are usually coupled by subsystems in many fields. Traditional single-domain simulation tools can not meet the needs of system simulation. Modelica multi-domain unified modeling language can describe models in different fields in a unified way, which is very suitable for modeling and simulation of such systems. Mechanical multi-body system simulation is an important content of electromechanical product simulation. It should be fully supported in the Modelica modeling environment, but currently the creation of the Modelica multi-body model is mainly based on the Modelica multi-body library or using a similar approach. The modeling process of these methods is cumbersome, the model created is not intuitive enough, the redundant constraints and initial assembly can not be handled, and it is not convenient to import the model of mainstream multi-body software such as ADAMS. In order to solve the above problems, this paper puts forward a new method, which is based on the Cartesian method of multi-body system, to transform the physical model into a mathematical model based on the 3D multi-body modeling tool as the front end of the modeling. Then the mathematical model is transformed into a method of Modelica representation according to the Modelica syntax specification. Based on this method, the 3D visualization modeling system of Modelica multi-body system is realized. (1) the physical and mathematical models of multi-body system are analyzed, and the redundant constraint cancellation and initial assembly problem which are closely related to multi-body modeling are also studied. 2) based on the above research, a set of mapping techniques from multi-body system physical model to mathematical model to final Modelica representation is proposed. 3) according to the mapping technology from the multi-body physical model to the Modelica representation, the multi-body modeling software InteDyna is used as the front end of the modeling. A multi-body visualization modeling system of Modelica is designed and implemented. Finally, the multi-domain unified modeling and simulation platform MWorks is used as the verification tool to carry out an example test. The results show the validity of the mapping technique from the multi-body physical model to the Modelica representation, and the rationality of the designed Modelica multi-body 3D visualization modeling system. The method proposed in this paper lays a foundation for the conversion of the assembly model of the general mechanical structure design software to the functional model in multi-domain environment.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH128

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