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. © 2019, Chinese Society of Agricultural Machinery. All right reserved.