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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2020, Vol. 54 Issue (9): 1795-1804    DOI: 10.3785/j.issn.1008-973X.2020.09.016
    
Dismantling equipment design for scrap product based on Petri net
Kai-yuan SU1(),Zhi-gang XU1,*(),Jian-feng ZHU1,Wei-min LIU2
1. School of Mechanical Engineering, Shandong University, Jinan 250061, China
2. Shenzhen Research Institute of Shandong University, Shenzhen 518057, China
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Abstract  

A method for constructing the function to structure mapping was proposed based on Petri net according to the demand of dismantling equipment in the process of dismantling and recycling scrap products, in order to design the dismantling equipment of product-specific parts. The function to structure mapping was extended, and the analysis of requirement and behavior was added to construct the conceptual design of the requirement to function mapping and the structure design of the function-behavior-structure mapping. The demand domain, functional domain and behavior domain were decomposed and the function surfaces were obtained, then the TRIZ theory was used for innovative design to reconstruct the structural model. The triangular fuzzy numbers were used to compare and evaluate different innovative schemes, and to select the best design scheme. Finally, to realize the mapping of dismantling equipment from demand to function to structure. The scrap bicycle handlebar was selected as the disassembly object, to obtain the design scheme and design the structural model of handlebar dismantling equipment according to the extended mapping model.

Key words： Petri net      function to structure mapping      dismantling equipment      innovative design      fuzzy evaluation     
Received: 22 August 2019      Published: 22 September 2020
CLC:  TH 122  
Corresponding Authors: Zhi-gang XU     E-mail: 940646398@qq.com;zhgxu@sdu.edu.cn
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Kai-yuan SU
Zhi-gang XU
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Wei-min LIU
Cite this article:

Kai-yuan SU,Zhi-gang XU,Jian-feng ZHU,Wei-min LIU. Dismantling equipment design for scrap product based on Petri net. Journal of ZheJiang University (Engineering Science), 2020, 54(9): 1795-1804.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.09.016     OR     http://www.zjujournals.com/eng/Y2020/V54/I9/1795


基于Petri网的废旧产品拆卸设备设计

为了设计产品特定零部件的拆卸设备，针对废旧产品在拆卸、回收过程中的拆卸需求，提出基于Petri网构建功-构映射模型的方法. 将功-构映射进行扩展，加入需求与行为分析，构造出需求-功能映射的概念设计和功能-行为-结构映射的结构设计；对需求域、功能域和行为域进行分解，根据得到的功能表面利用TRIZ理论进行创新设计，重构出对应的结构模型；运用三角模糊数对不同创新方案进行对比评价，选出最优设计方案，实现拆卸设备从需求到功能再到结构的映射. 选取废旧自行车把手作为拆卸对象，根据扩展后的映射模型选出设计方案，设计出车把拆卸设备的结构模型.


关键词： Petri网,  功-构映射,  拆卸设备,  创新设计,  模糊评价 
Fig.1 Requirements to function mapping of dismantling equipment
Fig.2 Function to structure mapping of dismantling equipment
Fig.3 Function to behaviors mapping of dismantling equipment
Fig.4 Function to sub-functions mapping of dismantling equipment
Fig.5 Behavior to sub-behavior mapping of dismantling equipment
Fig.6 Behavior to structure mapping of dismantling equipment
Fig.7 Function to structure mapping model of Petri net
Fig.8 Schematic of function to behavior to structure mapping
Fig.9 Extended function to structure mapping model of Petri net
语言变量 取值范围
含义 缩写
非常高的一致性 VH [0.833，1.000]
高度一致性 H [0.667，1.000]
中等高度一致性 MH [0.500，0.833]
中等一致性 M [0.333，0.667]
较低一致性 ML [0.167，0.500]
低一致性 L [0，0.333]
非常低的一致性 VL [0，0.167]
Tab.1 Meaning and range of linguistic variables
Fig.10 Triangular membership functions graph of linguistic variables
指标 维度 指标 维度
C1：新颖性 c2：独创性
c12：范例相关性 		C3：相关性 c31：适用性
c32：有效性
C2：可行性 c21：可接受性
c22：可实现性 		C4：独特性 c41：明确性
c42：完整性
c43：清晰性
Tab.2 Corresponding dimensions of different evaluation indicators
语言变量 相对重要性值 语言变量 相对重要性值
同等重要 1 非常重要 7
稍微重要 3 极端重要 9
明显重要 5 上述相邻变量的中间值 2、4、6、8
Tab.3 Value of relative importance for different language variables
拆卸方式 拆卸时间/s 拆卸成本
人工拆卸 120 3000~6000元/月
拆卸设备 100 1~10万/套
Tab.4 Demand comparisons of two disassembly methods
Fig.11 Diagram of front wheel and fixing equipment
Fig.12 Diagram of front wheel functional surface
Fig.13 Diagram for joint of handlebar
Fig.14 Diagram for functional surface of handlebar
Fig.15 Dismantling equipment model of handlebar
Fig.16 Diagram for dismantling process of handlebar
指标 方案一 方案二
独创性 L H
范例相关性 ML L
可接受性 H MH
可实现性 H M
适用性 L H
有效性 L H
明确性 L H
完整性 MH H
Tab.5 Evaluation levels of two schemes under different indicators
Fig.17 Comparison of triangular membership functions of two schemes
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