Research On Key Technologies Of Collaborative Design For Tractor Performance Prototype

The agricultural equipment field is one of the ten key development areas of Made in China 2025.Modern tractors are high-end agricultural equipment integrating new technologies such as mechanical,electronic,hydraulic,control,and energy saving.To realize the tractor product design digitalization,networking and intelligence,the development and design of tractor product performance prototype can provide model basis for the multidisciplinary and off-site collaborative design,distributed virtual test and digital production of new product development,can carry out tractor product offsite multi-domain and multidisciplinary modeling,simulation,collaborative design and verification test,can improve the tractor product quality and performance,shorten product development cycle and save product development cost.To realize the performance prototype collaborative design for the new tractor product development,a collaborative design system is designed based on the collaborative design process.By studying the key technologies of tractor performance prototype collaborative design,a collaborative design platform covering modeling,simulation,design,management and evaluation functions has been developed,which has laid a foundation for tractor product development and performance verification.The tractor performance prototype collaborative design system and modeling technology are studied.The tractor performance prototype collaborative design process is analyzed,and a process model is created.Based on analyzing the functional requirements of the tractor performance prototype collaborative design system,the system structure and its operation mode is designed.The tractor performance prototype modeling requirements and collaborative modeling methods are analyzed.Based on ontology metamodel modeling approach,the tractor performance prototype ontology construction process and multidisciplinary modeling process are studied,and the tractor performance prototype ontology model is designed.The tractor ontology model class construction,attribute definition,instance addition,formal representation and verification are completed with Protégé,realizing the tractor performance prototype modeling.The relational database technology is used to complete the persistent storage of ontology model,and the model database is established,realizing the sharing and management of ontology model data.The tractor performance prototype collaborative simulation technology is studied.The collaborative simulation requirements are analyzed.Multidisciplinary collaborative simulation methods are compared,and the method based on high level architecture(HLA)is selected.The mapping rules of ontology metamodel and HLA model,the unified modeling of HLA run time infrastructure(RTI)and the method of generating HLA collaborative simulation object model based on ontology are studied.Taking the transmission system and braking system as examples,the mapping of tractor performance prototype ontology metamodel and the collaborative simulation object model is realized.Taking the transmission system as an example,the collaborative simulation model is established.On the basis of analyzing the timing logic,the collaborative simulation is realized,and the effectiveness of the tractor performance prototype collaborative simulation method is verified,realizing the integrated transformation of tractor performance prototype multi-domain models.The tractor performance prototype collaborative design technology is studied.The collaborative design requirements and the task planning principles and methods are analyzed.The design structure matrix(DSM)based task planning method is verified by taking the tractor transmission system collaborative design as an example.The collaborative design process modeling method based on layered colored Petri net(CPN)is used to verify the tractor transmission system collaborative design.According to the collaborative design conflict resolution method,a collaborative design conflict resolution integration strategy is formulated,and a case-based collaborative design conflict resolution process is designed.The conflict resolution analysis is carried out by taking the design of the drive shaft that cooperates with the tractor gearbox body as an example,and the conflict resolution method is verified.It realizes the preliminary application of task planning,process modeling and conflict resolution theory in tractor performance prototype collaborative design.The tractor performance prototype management,test and evaluation technology are studied.The connotation of tractor performance prototype development process management is analyzed,and the process chain of tractor performance prototype development is formulated based on the definition process dimension and the life cycle dimension in product development,and the organization level and process behavior of tractor performance prototype development are specified.The tractor performance prototype management techniques such as data management,team management,project management and workflow management are analyzed.The connotation of tractor performance prototype test and evaluation is analyzed.According to the requirements of the system structure,the tractor performance prototype test and evaluation architecture based on comprehensive integration is studied.The tractor performance prototype test and evaluation process principles are analyzed and described,which ensures the development and implementation of the tractor performance prototype management system and the test and evaluation system.The overall scheme of the tractor performance prototype development system consisting of design,simulation,test and evaluation and management subsystems is studied and designed,and the functions are defined.From the architecture,network structure,functional structure,program flow,system application,etc.,the feasibility of the theory and method is verified with design practice.It provides a collaborative support environment for tractor performance prototype development implementation,and new methods and technologies for the development and verification of new tractor products.In the initial application process,good results have been achieved.The collaborative work efficiency between designers and simulators has been improved,making the development efficiency increased by nearly 20%,the development cycle shortened by nearly 15%,reducing the number of performance tests and development cost by nearly 10%.With the deepening of application and the accumulation of data,the design and development level and effectiveness will be further improved,which is of great significance for promoting tractor technological innovation.