共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
3.
4.
5.
6.
介绍了应用割集算法实现装配体装配序列规划的思路;从子装配提取、装配层次树、装配关联图、装配约束条件引入入手,阐述了割集算法在中药粉碎设备装配序列规划中的应用方法;并对产生的装配序列进行了装配路径模拟。 相似文献
7.
装配关系的有向图表达方法研究 总被引:14,自引:2,他引:14
产品的装配关系表达方法直接关系到计算机辅助装配规划的方法与效率,分析了已有的装配关系表达方法,提出了有向装配连接图概念,有向装配连接图能够将建模的过程信息保存在有向边中,从而有割集分解方法进行装配序列规划提供更多信息。通过将装配建模配合关系建立过程转换成图的有向边表示,给出有向装配连接图的构造方法,在证明有向装配连接图相关性质基础上,给出在Unigraphics系统实现有向装配连接图算法。 相似文献
8.
9.
装配割集的可行性判断 总被引:3,自引:0,他引:3
在计算机辅助装配规划中,用割集法求解装配序列,需要对每一步割集分解进行可行性判断。本文综合考虑多方面的因素,提出按子超集关系、几何可行性、机械可行性、技术可行性和稳定性判断的顺序,分五步逐次判别装配割集的可行性,并给出具体实现方法。综合运用本文所提的可行性判断方法,可以在序列生成过程中高效、简便的得到可行的装配序列。 相似文献
10.
为提高斜轴式轴向柱塞泵的装配质量,获得最优装配序列,引入层次化割集法规划装配序列.根据装配关系信息提取子装配体和聚族,构造层次关系树及联接关系模型,并通过可行性判断求解可行装配序列.综合考虑装配的复杂性、时间、成本等因素,从4个方面对可行装配序列进行综合评价,得到最优装配序列.层次化割集法解决了装配序列中的“组合爆炸”问题,提高了斜轴式轴向柱塞泵装配序列规划效率,为其装配工艺规划提供了依据. 相似文献
11.
面向序列规划的装配工艺APS树模型生成的研究 总被引:3,自引:0,他引:3
分析了现有装配序列规划方法和装配序列表达模型的缺陷,提出了一种合理的装配工艺APS树模型,并用这种模型表达非线性的装配序列。利用产品功能结构树和零部件的信息,采用基于装配关系图分割的几何推理和基于规则的知识推理的方法来简化工艺子装配体的识别,以此生成装配结构树。然后,利用装配知识判定子装配体的装配优先约束关系,提高由装配结构树生成装配工艺APS树的效率。最后,基于装配结构树,通过不断添加数据节点和关系节点,自上而下分层规划,从而生成产品的装配工艺APS树。 相似文献
12.
13.
14.
支持虚拟装配的装配约束关系信息动态生成 总被引:3,自引:0,他引:3
分析了虚拟装配规划中装配模型重构对装配约束关系信息的需求,提出了装配约束关系信息动态生成的处理技术.通过分析装配特征及装配特征信息,建立了基于装配特征的装配关系模型.将装配约束关系信息以零件为单位构建零件装配约束关系集,以子装配体内所有零件装配约束关系集为集合元素,构建子装配体装配约束关系集族.通过子装配体装配约束关系集族的"广义并集"与"广义交集"的差运算,获取子装配体与其外部零件之间的装配约束关系信息;通过子装配体或装配体的装配约束关系集族的"广义交运算",并利用装配约束二元关系的传递性,获得零件之间未定义的装配约束关系信息,从而实现装配关系模型信息的动态生成,以支持虚拟装配中装配模型的重构、装配规划和装配仿真. 相似文献
15.
Li Xin Shang Jianzhong Cao Yujun 《The International Journal of Advanced Manufacturing Technology》2017,90(5-8):1307-1315
A method of generating assembly sequences is developed in this paper, which can be used in the satellites assembly. The method must take into account the assumptions specific for assembly processes of large number of connections, multi-stage and parallel assembly. Setting priority relations between connections is involved. The assembly sequence is presented as a directed acyclic graph, whose vertices are mutually uniquely assigned to the connections. The minimization of the number of violated priority precedence of performing connections has been proposed as a criterion of optimization. In this article, a new way of coding the acyclic serial-parallel sequence was designed. The proposed method allows analyzing the sequence using the graph theory. Original, two-part crossover and mutation operators for assembling sequence were proposed. Examples of calculations are performed on an actual structure of a local structure of a satellite. 相似文献
16.
17.
一种基于子装配体识别的装配顺序生成 总被引:2,自引:0,他引:2
装配体表达为装配连接图,在识别子装配的基础上,给出了简化装配体装配顺序的确定方法。文中对子装配的识别原则和装配顺序、装配方向的确定等问题进行了详细的阐述。 相似文献
18.
基于有向图的活动序列比较及其在装配序列评判中的应用 总被引:1,自引:0,他引:1
在分析活动序列内涵的基础上,提出了用于描述活动序列及评价指标参考序列的两个模型--完全AOV网和扩展AOV网,给出了一种基于有向图的活动序列相似度的计算方法,实现了工程任务安排决策中活动序列方案对各评价指标满足程度的量化计算.在装配序列规划中的应用实例表明,该方法较好地解决了工程任务安排决策中方案的自动评价与选择问题. 相似文献
19.
Y.W. Bai Z.N. Chen H.Z. Bin J. Hun 《The International Journal of Advanced Manufacturing Technology》2005,27(1-2):96-105
An integration strategy for assembly sequence planning and sequence scheme evaluation is proposed. This strategy can be used
to plan a reasonable assembly sequence, to optimize a sequence scheme, and to predict whether a collision will occur between
the assembly tool and assembled components by considering factors like target components and assembly resources.
A hybrid method is presented for assembly sequence modeling that combines human-computer interactive operations to manually
build a hierarchical assembly sequence main model and a hybrid graph method to automatically generate sub-assembly sequence
schemes of the main model. An optimization algorithm based on time-cost is introduced to handle a best candidate components
selection. This relieves the problem of limited capability found when handling large size assembly models with traditional
methods. The essential issues involved in system implementation are discussed as well; these include a representation method
for the assembly consequence model, an optimization model of assembly sequence planning, and an object-oriented system architecture
model employed with multi-agent technology for visually evaluating the assembling process.
This system, KM computer-aided assembly process planning, KMCAAPP, has been developed on the basis of our previous work, KMCAD3;
KMCAAPP uses the presented approach. KMCAAPP can be integrated with CAD model from KMCAD3D. A case study shows that the presented
approach can use large CAD assembly models and delivers a feasible and effective way to integrate the assembly sequence planning
process with scheme evaluation by visually evaluating the assembling process. This allows the identification of design errors
in a timely manner and mitigates economic loss. 相似文献