共查询到18条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
基于事例的推理技术CBR是人工智能技术发展的重要领域之一,而大型事例库的检索,一般的索引法和最近邻法等方法难以达到快速、准确的检索要求.因此,有必要研究智能检索推理技术.本文根据事例学习的决策树ID3和PID算法,提出了多概念学习决策树MNID算法,开发了基于事例学习的智能模具相似结构推理系统,并应用于冲模凸模结构Case库的检索,效果很好,系统通过事例的自主学习,产生出推理规则,并能根据用户对所设计模具结构的要求,自动检索出符合设计要求的相似Case,实现了CAD过程中大型Case库的自动检索. 相似文献
6.
7.
模具结构辅助设计Case智能推理系统 总被引:5,自引:0,他引:5
基于事例的推理技术CBR是人工智能技术发展的重要领域之一,而大形事例库的检索,一般的索引法和最近邻主以达到快速、准确的检索要求,因此,有必要研究智能检索推理技术。本文根据事例学习的决策树ID3和PID算法,提出了多概念学习决策树MNID算法,开发了基于事例学习的智能模具相似结构推理系统,燕应用于冲模凸模结构Case库的检索,效果很好,系统通过事例的自主学习,产生出推理规则,并能根据用户对所设计模具 相似文献
8.
9.
汽车覆盖件的冲压工艺方案设计是一个复杂且对经验要求比较高的过程。由于大型复杂冲压件工艺的复杂性和决策过程的强经验性,任何单一的推理决策方法,如基于规则的推理、基于事例的推理、基于模型的推理等,均难很好地解决其推理决策问题。基于KBE的工艺方案设计是以工艺特征模型为基础,通过多种推理机制,包括规则推理(RBR)、模型推理(MBR)、事例推理(CBR)、遗传算法(GA)等,确定产品成形的工艺路线、各工序件的初始几何模型及模具类型等。本文的决策模型采用多元智能决策技术,有效地解决了大型复杂冲压件的工艺方案决策问题。 相似文献
10.
分模设计的好坏直接影响模具的结构设计及加工,它是一个典型的强经验、弱理论的工作。基于事例推理(CBR)方法,是解决强经验、弱理论问题的有效方法之一。针对遥控船船体模具UG分模问题,提出了一种基于CBR的船体模具UG分模设计框架。 相似文献
11.
An integration system was developed to satisfy the need of information integration in the process of designing, investment casting and monitoring aero-engine's turbo blade. The general architecture is detailed presented in this paper. The system mainly comprises of product master model, design information management, anti-deformation design of mould cavity, intelligence mould design and blade testing. The developed system can manage mould design and blade test data flow, optimize mould design process and achieve the goal of integration design. 相似文献
12.
13.
针对某燃机叶片叶型部分形状复杂和轮廓度精度要求高的特点,提出了一种基于熔融沉积技术的燃机叶片快速熔模铸造方法,通过基于NURBS曲线的分层截面生成算法对燃机叶片STL(stereolithography)模型进行分层,提高燃机叶片模样的轮廓度精度,制订了燃机叶片快速熔模铸造工艺流程,采用三坐标测量机对燃机叶片铸件进行测量,对其两个关键截面进行型线轮廓度偏差分析与评价,结果表明:基于熔融沉积技术的快速熔模铸造燃机叶片铸件在轮廓精度方面满足要求,快速熔模铸造工艺流程合理、可行。 相似文献
14.
15.
16.
Turbine blade is one of the critical components of aircraft engine. The performance of the engine depends on the shape and dimensions of components, but superalloy blade material cannot be easily machined.Although investment casting is an ideal process for such net-shape components, it requires an accurate determination of the casting-die profile. In this paper, a reversing design methodology for investment casting die using ProCAST is proposed. By combining the methods of simplifying grid files and quick sorting, the efficiency of sorting and matching can be largely improved. Further, the mould/die cavity anti-deformation system can be easily built. With ProCAST, the optimized die profile for investment casting can be established. 相似文献
17.
18.
《International Journal of Cast Metals Research》2013,26(2):114-122
AbstractMullite base shell mould system is used for casting of superalloys in columnar and single crystal grains in temperature range of 1480–1550°C. The colloidal silica gel+mullite filler with and without fine alumina slurries was prepared followed by two shell moulds: one without alumina (shell system I) and the other with alumina (shell system II). Shell made with slurry system II resulted in increase in green strength by 10% and fired (950°C) strength by 125% respectively. Sag resistance capability was observed more for shell system II for tested temperatures from 1500 to 1650°C. Dimensional stability of low pressure turbine blade cast at 1550°C was also studied. No shell bulging effect was observed for both shell moulds. The importance of mullite filler material for shell mould to be used for investment casting and its capability to withstand high temperature without metal mould reaction have been highlighted. 相似文献