Research And Development Of Intelligent Design System For Rotary Tiller Based On KBE

At present,the product design of my country’s agricultural equipment companies is often based on tracking imitation,and experienced engineers are required to be responsible for the entire process from the user’s request to the completion of the product design.And a lot of work in the process is a simple repetition of the design of the previous product,which is inefficient and costly.The rotary tiller is a typical agricultural equipment with high product diversity and strong regional applicability.Therefore,in order to solve the problem of low design efficiency of the rotary tiller,this paper takes the horizontal intermediate gear transmission rotary tiller as the research object,and builds the intelligent design system of the rotary tiller based on the knowledge engineering theory;systematically studies the design knowledge and knowledge representation of the rotary tiller;Researched the hybrid reasoning algorithm and reasoning explanation mechanism of the rotary tiller;developed the rapid design system of the rotary tiller based on the secondary development of multi-platform and carried out system simulation verification.The system can be used for the rapid design of rotary tillers,which helps shorten the design cycle of rotary tillers,effectively inherit product design experience and improve product design efficiency.The main research work of this paper is as follows:(1)Starting from the design requirements and working process of the rotary tiller,the knowledge model was divided.By consulting the existing data and investigating several models in circulation,the design knowledge of key components was studied in depth,and some tacit knowledge was excavated.By studying the working conditions of various types of rotary tillers,the selection rules for rotary tillers are obtained;the design rules for the number of rotary tillers are obtained under the premise of ensuring the farming effect;the suitable rotary tillers for various soil types are obtained Arrangement method;by investigating the relationship between the distance between the tool holders of the existing models and the model of the rotary tiller,the fitting curve is used to obtain the relationship rules between the distance between the tool holders and the working width of the rotary tiller;State analysis and material mechanics analysis of the cutter shaft,under the premise of ensuring reliability,the design rule of cutter shaft thickness is obtained.Through reverse engineering technology,the three-dimensional scanner is used to scan various types of rotary tillers to obtain examples of rotary tillers,and examples of standard parts are obtained through design software,and three different types of rotary tillers are drawn.(2)Sort out the design rules of the rotary tiller,starting from the analysis of the characteristics of knowledge,through the framework notation and the production rule notation,the various knowledge of the rotary tiller is expressed in a form that the computer can understand.Based on SQLite relational database,the knowledge base of the rapid design system of rotary tiller and its management system are constructed,which mainly include parameter library,rule library,and case library.(3)Combined with the characteristics of the rotary tiller,the research and design of the rapid design system reasoning module algorithm,focusing on the design of fuzzy reasoning based on empirical knowledge and case-based reasoning,combined with the algorithm to design a hybrid reasoning algorithm.Based on the system knowledge base,the detailed parameters of the whole machine and the instance with the highest similarity can be quickly obtained from the user’s needs.In order to improve the transparency of the algorithm,a reasoning explanation mechanism is designed to achieve sufficient explanation content without redundancy.(4)On the basis of the above-mentioned theory and method research,the key technology research of the rapid design system of rotary tiller was carried out,and a complete system platform was developed,including database link module,inference engine system module,part parameterization module and automatic part assembly module,innovatively use the database as an intermediate platform,calculate and save the parameters,then call the parameters and assign them to the parametric modeling module,so that every design can be recorded.An application example was given.The actual operation proved that under the environment of Windows 10 operating system,Intel i5 7th processor,16 G memory configuration,the design of the whole machine can be completed and the 3D model can be output in 2～3 minutes.(5)In order to verify the reliability of the system,EDEM-ANSYS coupling simulation analysis was performed on the output products.The simulation results proved that the soil fragmentation rate was about 72.13%,the soil flatness after tillage was about 2.8cm,and the maximum stress of tillage parts was 48.3MPa,which are in line with national standard.Prove that the system design product fully meets the actual use requirements.