基于全息模型库的数字样机运动机构交互式创建系统

针对运动机构创建过程中涉及定义运动副元素多、操作繁琐、专业性强、模型跨平台转换费时、效率较低等问题,提出了一种运动机构交互式创建系统,通过人机交互创建运动机构,方便用户快捷获取机构运动学参数,为机构设计提供参考。基于农机装备智能化设计系统全息模型库,以Visual Basic为开发语言,使用CATIA(Computer aided tri-dimensional interface application)二次开发接口、Windows API函数,实现对CATIA DMU(Digital mock-up)运动机构工作台创建运动机构命令的封装,以弱化专业背景知识的限制。以联合收获机割台为系统测试对象,分析零件间的运动关系,明确运动副的组成,通过模型预处理完善运动副构建要素,按标识规则在结构树上重命名各构建要素,并将其信息导出后储存。实例分析证明了该系统的可行性和有效性,本研究为农机装备智能化设计系统的研究提供了共性基础技术。

Digital Prototype Motion Mechanism Interactive Creation System Based on Holographic Model Library

Mechanical design is an important guarantee for the quality of entire mechanical engineering, and the traditional mechanical design cannot meet the current needs, therefore, the development of intelligent mechanical design has become an inevitable trend. Intelligent design was researched and applied in the field of machinery, but research and application in the field of agricultural equipment was still in its infancy. In the intelligent design process of agricultural equipment, it was necessary to establish a design system, including model library, knowledge base, inference engine and intelligent assembly. For the mechanism with motion attribute in the system model library, the digital prototype can replace the physical prototype for the designer to analyze the performance and parameters related to the motion, which required the addition of motion simulation function module in the intelligent design system to test the motion characteristics of the mechanism in the model library and obtain its motion parameters. Aiming at the problems involved that the multiply of defined motion pairs elements, the cumbersome operation, the strong professional operation, the time consuming conversion of the model between platforms, and the low efficiency in the process of creating a motion mechanism. An interactive creation system for motion mechanism was researched, the motion mechanism was created through human computer interaction, which was convenient for users to quickly obtain the kinematic parameters of the mechanism, and provide reference for the design of the mechanism. On the CATIA DMU (Digital mock up) motion mechanism workbench, the package command of the creation of motion mechanism was intended to weaken the limitations of professional background knowledge, which was based on the holographic model library of the intelligent design system of agricultural machinery and equipment, using secondary development interface of software of computer aided tri dimensional interface application (CATIA) with the development language Visual Basic and Windows API function. The cutting table of combine was used as the system test object, the motion relationship between the parts was analyzed, the composition of the motion pairs was defined, the construction elements of the motion pairs were perfected by model preprocessing, the construction elements were renamed on the structure tree according to the identification rules, the information of which was exported and stored. The result of the test indicated that the system was feasible and effective, and the study promoted the acquisition of the kinematic parameters of the mechanism, and also provided a common basic technology for the research of the intelligent design system of agricultural machinery.