Research On Method Of Mechanical Product Innovative Design Based On Patent Knowledge

After the comprehensive analysis of patent text processing method and the research of innovative design method and system based on patent knowledge, the method of innovative design of mechanical product based on patent knowledge is proposed in the thesis, against the problems existing in the research of patent knowledge used in innovative design. The main progress of the above research is reflected as the following five aspects.1. Research on automatic classification method of patentsThe characteristic of the description of patent text is studied, and the disadvantages of the existing classification methods for classification method of patents, including character choosing algorithm and classification algorithm, are analyzed and discussed. Based on the algorithm of Information Gain and K Nearest Neighbor, the algorithm of improved Information Gain for character choosing and improved K Nearest Neighbor for patent classification are proposed. Furthermore, an automatic classification method of patents are proposed by combining the above two improved algorithms. Finally, taking the classification of US patents as an example, the accuracy and efficiency of the proposed automatic classification method of patents are confirmed, which will contribute to the follow-up retrieval and analysis applied in innovative design based on patents.2. Research on novelty evaluation method of patentsAccording to the characteristics of the knowledge contained in patents, the verbs and nouns in patent text can be used to represent principle design knowledge and structure design knowledge respectively. Through introducing the compute concept of information entropy, the novelty evaluation method of patents is proposed, including novelty degree and compatible degree of patents. Moreover, the method of morphological analysis of patents is studied. And the novelty evaluation model of combined patent knowledge is constructed by combining with morphological analysis and the novelty evaluation method of patents. Furthermore, the novelty evaluation process of combined patent knowledge is proposed on the basis of morphological analysis. Taking the novelty evaluation process in the innovative design of self-locking straight line drive mechanism as an example, the influence of the novelty evaluation result caused by the change of patent account and word account of patent knowledge is contrasted and analyzed. The practicality of the evaluation method based on the novelty degree and compatible degree and the innovative design method of combined patent knowledge are verified.3. Research on acquisition method for principle solution of mechanical patentFor mechanical product patent, this section discusses the problems of the existing acquisition method and representation method for patent principle solution, and proposes a new knowledge acquisition method for principle solution of mechanical patent including the acquisition task of technical object and technical relationship. Furthermore, the graphical representation of principle solution is proposed. Based on Extensible Markup Language Schema Definition (XSD) and Unified Modeling Language (UML), the representation model of patent principle solution is established. According to the characteristics of mechanical patent text, technical object is identified and acquired with the method of maximum entropy model and patent term dictionary. And through establishing the composition verb database, technical relationship is acquired. This method has some advantages such as the intuitionistic representation of the patent knowledge and the feature that the knowledge is automatically processed by computer. A whole process involving the steps like acquiring the principle knowledge from patent documents, writing the knowledge into XSD and transforming XSD to the representation model is illustrated with a US patent in detail. The model and process laid the foundation for the efficient utilization of patent knowledge.4. Research on innovative design of mechanical product based on patent inspirationsIn the section, the type of patent knowledge for triggering inspirations is summarized. The characteristics of all kinds of patent knowledge are analyzed. The acquisition method of patent knowledge for triggering inspirations is proposed based on regular expression and Non-deterministic Finite Automaton. According to the invention type of authorized patent, inspiration principles are systematically summarized by combining with the type of patent knowledge for inspirations. And, some new inspiration principles that have not found till today are summarized. On this basis, innovative design process is proposed based on patent inspirations. Through constructing inspiring environment by taking inspiration principles and patent knowledge as the core, the inspiration of the designer is triggered to assist innovative design. Taking the innovative design of hydraulic cylinder with the function of self-locking as an example, the feasibility and validity of the innovative design process is proved finally.5. Research on computer aided innovation system based on patent knowledgeOn the basis of the above research, computer aided innovation system realizing the innovative design process based on patent knowledge is developed, which is consisted of knowledge database, patent database, rule database and function modules. Combining with the innovative design of hydraulic cylinder, the operating interface and approach of the function modules of the system are illustrated, and the effectiveness of the system is primarily verified. As a result, the innovative design generated with the assistance of the system is authorized as a state invention patent.