Engineering knowledge formalization and proposition for informatics development towards a CAD-integrated DfX system for product design

Target design methodologies (DfX) were developed to cope with specific engineering design issues such as cost-effectiveness, manufacturability, assemblability, maintainability, among others. However, DfX methodologies are undergoing the lack of real integration with 3D CAD systems. Their principles are currently applied downstream of the 3D modelling by following the well-known rules available from the literature and engineers’ know-how (tacit internal knowledge).This paper provides a method to formalize complex DfX engineering knowledge into explicit knowledge that can be reused for Advanced Engineering Informatics to aid designers and engineers in developing mechanical products. This research work wants to define a general method (ontology) able to couple DfX design guidelines (engineering knowledge) with geometrical product features of a product 3D model (engineering parametric data). A common layer for all DfX methods (horizontal) and dedicated layers for each DfX method (vertical) allow creating the suitable ontology for the systematic collection of the DfX rules considering each target. Moreover, the proposed framework is the first step for developing (future work) a software tool to assist engineers and designers during product development (3D CAD modelling).A design for assembly (DfA) case study shows how to collect assembly rules in the given framework. It demonstrates the applicability of the CAD-integrated DfX system in the mechanical design of a jig-crane. Several benefits are recognized: (i) systematic collection of DfA rules for informatics development, (ii) identification of assembly issues in the product development process, and (iii) reduction of effort and time during the design review.     

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Solving method of generalized nonlinear dynamic least squares for data processing in building of digital mine

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南水北调工程十堰方滩乡塌岸预测评价

分析库岸再造的影响因素,结合十堰市方滩乡的库岸地质环境问题,采用典型稳定库岸坡度统计方法确定了不同岩性的最终稳定坡度值,选用坡角地质类比法对研究区的库岸再造问题进行工程地质评价,确定出塌岸带的宽度,从而指导移民规划工作。     

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在Solid Works平台上采用VB及API技术开发出颚式破碎机数字化开发平台.介绍了颚式破碎机数字化开发平台的结构、专家系统在破碎机方案设计中的应用及颚式破碎机结构参数的优化设计方法.该平台集设计计算、绘图、参数优化、分析于一体,实现了并行及敏捷设计.     

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