共查询到20条相似文献,搜索用时 22 毫秒
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对含有较多零件的复杂产品拆卸方法作了讨论,提出了一种基于子装配识别的拆卸序列生成算法。根据装配连接图和干涉图识别出子装配体,然后将子装配体看作一个零件,采用装配经验知识与几何推理相结合的方法生成子装配体序列,最后以一个装配实例说明了算法的有效性。 相似文献
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Chulho Chung Qingjin Peng 《The International Journal of Advanced Manufacturing Technology》2006,31(1-2):125-134
A product assembly or disassembly is completed by means of proper tools. The selection of feasible tools is an important process in planning a complete assembly or disassembly sequence. A key tooling consideration in assembly or disassembly planning is to reason the available space for a tool application during the assembly or disassembly of a product. Currently, assembly tool reasoning about space mainly depends on simulation-based or user-interactive approaches because of its computational complexity. These approaches are inappropriate in dealing with various what-if scenarios regarding assembly or disassembly planning in a rapid product development. They also depend on users’ expertise or experience in assembly or disassembly. This paper presents a novel approach to the geometric feasibility analysis for fast assembly tool reasoning. Techniques described in this paper are advantageous not only in the aid of generating a complete assembly or disassembly plan but also in the efficient support of such systems as computer-aided assembly planning (CAAP), design for manufacturing (DFM), design for assembly (DFA), design for disassembly (DFD), and computer-aided tool selection (CATS). 相似文献
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包含产品几何与非几何信息的产品装配要求是装配工艺设计的主要依据,对装配工艺设计决策结果具有决定性的影响。在装配工艺模型中描述产品的几何相关信息能够更好地表达如装配顺序,装配路径等内容,同时可以更好地辅助装配工艺决策,提高决策的自动化水平。提出一种几何增强的装配工艺本体模型,利用语义本体技术,建立产品几何信息在装配工艺中的描述方法,数据结构与关系描述。并以该模型为基础,建立基于几何增强装配工艺本体的装配工艺决策框架。该框架分为两部分:一是采用几何增强的装配工艺本体模型描述产品几何信息和装配工艺信息的数据结构和相互关系;二是为了让几何信息与装配工艺信息之间存在的丰富的隐含关系显性化,对语义本体推理机制进行增强,提出推理单元的概念,使决策框架具有从产品几何信息中推理装配工艺相关信息的能力,有效地支持装配工艺决策。以针对某传动器产品装配顺序决策的过程,验证所提出的几何增强装配工艺本体模型与框架的有效性。 相似文献
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基于工程语义信息的拆卸序列规划算法研究 总被引:2,自引:0,他引:2
为了解决拆卸序列规划理论算法存在的求解空间过大的问题,提出一种基于工程语义信息的规划算法.该算法借助装配约束条件、拆卸干涉状况等工程信息,实施产品拆卸顺序生成和路径推理,直接排除从工程角度不可能的拆卸序列,达到缩减求解空间的目的.保证了算法同工程实际的一致性,提高了其实际应用和软件编程能力. 相似文献
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Xinhua Liu Youhui Liu Bihong Xu 《The International Journal of Advanced Manufacturing Technology》2013,69(5-8):1359-1371
In order to improve the quality and efficiency of assembly sequence planning for complex mechanical product, a converse method-based approach for assembly sequence planning is proposed. Firstly, the disassembly interference matrix of product and the disassembly constraint degree of part are defined. Product disassembly sequence is obtained through geometry reasoning algorithm and the searching work of disassembly sequence is simplified by the contact constraint set. Secondly, the maneuverability of tool is inspected through the using matrix and interference matrix of assembly tool. The infeasible disassembly sequence is excluded and product assembly sequence is obtained by reversing the order of disassembly sequence. Thirdly, the evaluation mechanism for assembly sequence is established to get the optimal assembly sequence and the optimal assembly sequence is selected by calculating the value of evaluation function. Finally, a vibration generator is illustrated to verify the validity and feasibility of the proposed approach. 相似文献
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在Petri网柔性装配系统装配顺序规划中引入装配质量要素,并以装配零件的装配自由度,装配作业后稳定性,装配零件配合精度对装配质量的影响作为基本因子,提出装配质量置信度概念,解决柔性装配系统装配规划中装配质量及其定量化问题。根据装配形成的产品在Petri网装配状态图中表示为一个最终库所的特点,应用改进B树模型,提出仅以变迁信息的产品装配顺序规划Petri网逆向推理算法,简化装配顺序规划推理过程,对于多个变迁均可生成最终成品的情况,亦给出装配顺序规划的解决方案,并以摩托车发动机的装配为例,证明该算法是可行的。 相似文献
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Product cooperative disassembly sequence planning based on branch-and-bound algorithm 总被引:2,自引:2,他引:0
Xiu Fen Zhang Shu You Zhang 《The International Journal of Advanced Manufacturing Technology》2010,51(9-12):1139-1147
This paper focuses on the cooperative disassembly sequence planning (CDSP) problem which is essential to disassembly a large and complex product in practice. A disassembly hybrid graph model (DHGM) is constructed to describe the mating contact and noncontact priority relationships among constituting product components. Thus, the disassemblability constraint expression can be deduced from it by reasoning. The CDSP is different from the disassembly sequence planning except for they are NP-complete. Therefore, a novel method is presented to generate cooperative disassembly hierarchical tree (CDHT) from the DHGM based on branch-and-bound algorithm in which two user-defined variables are introduced to control the size of the CDHT .The optimal solutions with a minimal disassembly time are derived according to the objection function. Finally, an example illustrates the proposed method. 相似文献
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ShiQi Li Yi Liu JunFeng Wang HongMei Zeng 《The International Journal of Advanced Manufacturing Technology》2014,70(9-12):1903-1914
Assembly process planning is a difficult problem in the product design and development process. In order to reduce the difficulty of assembly process planning (APP), this paper presents an approach to finding a practical plan for assembly process through the intelligent interactive method based on hierarchical classification of parts. First, two hierarchical classification principles towards interactive disassembly are presented based on the key assembly constraint (KAC). Then, the initial assembly relationship of the product is readjusted to a new hierarchical structure which is more suitable for assembly planning according to a novel hierarchical classification algorithm. On the basis of the new hierarchy of product, an intelligent disassembly-based approach is presented, which not only takes full advantage of the ant colony algorithm for searching and constructing an initial assembly sequence with three available assembly principles, but also makes full use of the experience and knowledge of the human being for achieving a better assembly process. The intelligent disassembly approach can achieve an optimized assembly sequence, paths and scheme necessary information regarding the required assembly fixtures and tools. Finally, a case study shows that the proposed approach is feasible and practical. 相似文献
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Yuan-Jye Tseng Fang-Yu Yu Feng-Yi Huang 《The International Journal of Advanced Manufacturing Technology》2011,57(9-12):1183-1197
In a green product life cycle, it is necessary to determine how to disassemble a product before the product is planned to be assembled. In this research, a green assembly sequence planning model is developed. A closed-loop assembly sequence planning model is presented by integrating assembly and disassembly sequence planning models. For an assembled product, an assembly sequence planning model is required for assembling the product at the start, while a disassembly sequence planning model is performed for disassembling the product at the end. In typical assembly and disassembly sequence planning approaches, the two sequences are independently planned and evaluated. In this paper, a closed-loop model is presented to concurrently generate and evaluate the assembly and disassembly sequences. First, a graph-based model is presented for representing the feasible assembly sequences and disassembly sequences. Next, a particle swarm optimization (PSO) method with a new encoding scheme is presented. In the PSO method, the assembly and disassembly sequences can be simultaneously represented and evaluated with an objective of minimizing the total of assembly costs and disassembly costs. The test results show that the presented method is feasible and efficient for solving the integrated assembly and disassembly sequence planning problem. An example product is illustrated and discussed. 相似文献
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零件插装方向是影响产品可装配性的主要特征之一,其自动化提取对于提高可装配性评价的效率具有重要意义。本文提出了一种面向机器人装配的可装配性评价的零件插装方向自动化提取方法,根据给定的产品装配序列及计算机辅助设计信息,运用几何推理技术判断产品零件间的装配关系,建立产品装配关系模型,并基于自由度分析导出零件插装方向。 相似文献
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Disassembly modeling, planning, and leveling for a cam-operated rotary switch assembly: a case study
S. Vinodh R. Praveen Kumar N. Nachiappan 《The International Journal of Advanced Manufacturing Technology》2012,62(5-8):789-800
The manufacturing organizations have been witnessing a paradigm shift on designing products and services from manufacturing to sustainability. Product disassembly is a vital strategy for industrial recycling and remanufacturing which generates the desired parts and/or subassemblies by means of separation of a product into its elements. This article presents the appropriate methods for modeling planning and leveling the disassembly process of a cam-operated rotary switch assembly. The methodology involves disassembly modeling using a graphical approach. Disassembly process planning has been done using reverse assembly approach. Disassembly leveling has been done to maintain profitability and environmental features at a desired level. An optimal disassembly sequence has been derived using disassembly leveling. The resultant cost of disassembly for reusable components has been computed. The article presents a unique contribution to the field of designing for disassembly from the perspective of rotary switches. 相似文献
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Efficient method of assembly sequence planning based on GAAA and optimizing by assembly path feedback for complex product 总被引:5,自引:5,他引:0
Cheng Hui Li Yuan Zhang Kai-fu 《The International Journal of Advanced Manufacturing Technology》2009,42(11-12):1187-1204
In the process of complex product assembly, assembly resources (fixtures, tools, operations, and so on) must enter assembly environment with parts together to rapidly finish product assembly. Assembly planning must take assembly resources into account fully. But, designer cannot plan every assembly procedure because of the lack of assembly resources during assembly design. Then, it will cause assembly failures and redesign for assembly easily. This paper investigates an efficient method of assembly sequence planning based on genetic algorithm and ants algorithm (GAAA) and optimizing by assembly path feedback to assembly process planning including assembly resources for complex products. Firstly, a new GAAA is investigated to rapidly plan assembly sequence in order to solve the nondeterministic polynomial-bounded problem in high searching and solving efficiency. Secondly, on the basis of the assembly sequence, a B-Rep filling algorithm which can form a swept volume between the part and its kinetic orientation is developed to plan assembly path interactively. Thirdly, the performance of the assembly path according to the assembly sequence is analyzed and sent back to avoid the most of assembly collisions and interventions during product assembly design. Lastly, we develop a simulating system to simulate assembly sequence and path based on component application architecture for CATIA V5. The simulating result proved that the proposed method of assembly sequence planning based on GAAA and optimizing by assembly path feedback for complex products is efficient. Assembly optimal design including assembly resources can work well. 相似文献
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柔性装配系统设计的研究 总被引:1,自引:1,他引:1
对柔性装配系统设计中的装配顺序规划和机器人装配站规划进行了研究。装配体所有的分解方式可通过计算装配体零件接触关系的割集来实现,然后利用分离可行性和可行分离路径二条判来判断哪 些拆卸方式是可行的,重复上述分解过程,直到单个零件。 相似文献
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简要介绍了VRML语言定义、特点,阐述了机械零部件虚拟建模方法。对虚拟装配流程进行分析,并对产品装/拆运动的表示形式、虚拟装配路径规划及逻辑控制、虚拟装配过程中的碰撞检测方法等关键技术进行了研究,提出了产品装/拆运动12元组表示形式。最后,通过对机械产品交互式虚拟装配进行实例仿真,验证了该技术的可行性和合理性。 相似文献