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In the design process of maize combine harvester in China, there are characteristics of customization and high demand for diversification. Aiming at the problems of long design and development cycle, the structural design method of maize combine harvester header based on knowledge engineering is put forward, and the header of maize combine harvester is designed rapidly. Firstly, based on the design standards and specifications of agricultural machinery, the general design process of maize ear harvester header is determined. Secondly, according to the design knowledge and experience, the design method of the core parts of the header is determined, and an example model is established. Finally, based on the platform of MFC and Creo, integrating the design knowledge base, inference engine and parametric model, a rapid design system of maize ear harvester header is constructed. The rapid design of maize ear harvester header is realized, and the design and development efficiency of maize ear harvester header is improved so as to provide technical reference and support for improving the intelligent level of typical complex agricultural machinery equipment in China. 摘要 我国玉米联合收获机在设计过程中,存在定制化、多样化需求高的特点,针对其设计及开发周期长等问 题,提出基于知识工程的玉米果穗收获机割台的结构设计方法,对玉米果穗收获机割台进行快速化设计。首先, 在基于农业机械设计标准与规范的基础上,确定了玉米果穗收获机割台的一般设计流程;其次,根据设计知识 和经验,确定了割台核心部件的设计方法,并建立了实例模型;最后,在基于 MFC、Creo 的平台上,融设计知 识库、推理机和参数化模型为一体,构建了玉米果穗收获机割台的快速化设计系统。实现了玉米果穗收获机割 台的快速化设计,提高了玉米果穗收获机割台的设计和开发效率。以期为提高我国典型复杂农机装备智能化水 平提供技术参考与支持。 INTRODUCTION With the development of manufacturing technology, the period of agricultural equipment upgrading is becoming shorter and shorter. In the face of fast changing market, it is necessary to improve the efficiency of product design, speed up the overall process of products, and meet the increasingly diversified and personalized needs of users to improve the competitiveness of China's agricultural equipment production enterprises (Liu Hongxin et al, 2019). Rapid product design is the development and extension of computer aided design and manufacturing technology. In the current market environment of increasingly diversified and personalized user needs, and a product life cycle gradually shortened, rapid design technology emerges as the times require, which is the urgent demand of many manufacturers (Wagner P.W., 2017). Rapid design means rapid response design and agile design. Its main purpose is to shorten product design cycle, improve product quality and the rapid response ability of enterprises to the market (Li Changlin et al, 2012). As one of the most important crops in China, maize has high labour intensity in the harvesting process, accounting for 55% of the total input labour (Geng Aijun et al, 2016). China's Maize Mechanized Harvesting started late, and because of the diversity of maize planting mode, the development speed of maize mechanization is slow, which still lags behind the level of wheat and rice mechanized harvesting. 1 Tai Jianjian, Ph.D.Eng.; Li Haitao, Prof. Ph.D. Eng.; Mao Enrong, Ph.D. Eng.; Zhang Junnan, Long Xinjiani Vol. 61, No. 2 / 2020 INMATEH – 264 The header of maize ear harvester is the core part of maize ear harvester, and its performance directly affects the whole harvesting performance of maize ear harvester (Gianfranco La Rocca, 2012). During the operation, the maize plants first glide down to the ear picking opening under the function of the divider, the straw feeding device transports the maize plants to the ear picking device, and the ear conveying device transports the maize ear picked to the ear elevator (Chen Zhi et al, 2014). The researches of enterprises and scholars at home and abroad on the maize harvester header often focus on the improvement design of part of the original structure. Such research is often unsystematic and scattered with great limitations (Cui Tao et al, 2019). At present, there are still some problems such as the lack of intelligent design ability, design knowledge system and long product development cycle. If the knowledge is collected to build an intelligent rapid design system, it will greatly promote the development speed of products. In view of this, taking the forward design of maize ear harvester header as the starting point, this paper puts forward the structural design method of maize ear harvester header based on knowledge engineering. The header of maize ear harvester is designed rapidly, and the design process of the maize ear harvester header is established. The classification, expression and storage methods of header design knowledge are studied. A rapid header design system of maize ear harvester is constructed, which integrates the design knowledge base, inference engine and parametric model. The rapid design of maize ear harvester header has been realized, and the design and development efficiency of it has been improved, which is in line with the national medium and long term scientific and technological development planning outline and the "made in China 2025" strategic layout. FORWARD DESIGN FLOW OF MAIZE EAR HARVESTER HEADER

RAPID DESIGN OF MAIZE EAR HARVESTER HEADER BASED ON KNOWLEDGE ENGINEERING