Research On The Full Three-dimensional Digital Definition And Information Integrity Check Technology Of Key Components Of Marine Diesel Engine

This paper mainly studies the digital definition and information integrity inspection technology of the whole three-dimensional digital product definition and design and manufacture integrated system of marine diesel engine.Aiming at the present situation of enterprise production,the digital definition technology research and information integrity inspection technology of marine diesel engine key parts are studied.The main framework of digital definition and information integrity check system is set up,and two key technologies are studied.Some functional modules of the system are developed.The feasibility and effectiveness of these functions are verified by practical application.The main research contents and achievements are as follows:(1)Analyze the research status of the digital definition technology and information integrity inspection technology of this subject,and demonstrate the theoretical and practical value of the research.The functional requirements of the digital definition and the information integrity check system of the marine diesel engine are analyzed.Based on the analysis of the demand,the overall framework of the system is established,and the specification of digital definition and information integrity check is expounded.(2)The information contents that should be defined of the digital definition are summed up and the classified,for different types of information,different methods to define and organize the informations are put forward.The information contents that shoud be checked in the information integrity check are summed up,and according to the focus of information inspection,the information contents are divided into three categories of information: the information focusing on the correctness check,the information focusing on normative inspection and the information focusing on integrity check.(3)The digital definition process is developed and the principle of digital definition is summarized.The digital standardization method of the key parts of the marine diesel engine and the method of PMI information packet management and the information query method in the 3D MBD model are put forward,and the relevant digital definition tools are developed.The human-computer interaction interfaces of the three-dimensional annotation environment settings,information packet management,and associated information query are designed.(4)On the basis of NX's existing Check-Mate,the relevant checker of information normative inspection and information correctness check is developed according to the relevant standards and specifications,and the validity and practicability of the checkers are proved by an example.(5)Methods for checking the integrity of attribute information,process information,and dimensional information are proposed respectively.Among them,the dimensional integrity check as a focus of this article is also the difficulty of this study.In order to check the completeness of the dimension,two kinds of inspection methods are proposed in this paper: dimension integrity check method based on surface constraint and dimension integrity check method based on feature recognition and feature constraint.By comparing,the latter method is chosen as the final dimensional integrity check program.(6)Specify the dimensional integrity check based on feature recognition and feature constraint.The related concepts are defined,the degree of freedom analysis and the constraint analysis of the basic features are carried out,and the overall flow of the dimension check is established,and the constraint relation between the features is expressed by mathematical method.Based on the above research,the NX secondary development tools are used to develop the functional modules of the digital definition and information integrity check system of marine diesel engine key parts,and the effectiveness and practicability of these functional modules are verified.