A fault-tolerant assembly control method for flexible small parts based on cooperative petri nets

An assembly control and flexible technology, applied in the directions of adaptive control, general control system, control/regulation system, etc., can solve the problems of poor work flexibility, fault tolerance without control, etc., to meet the requirements of flexibility, fault tolerance and robustness The effect of sexual assurance

Active Publication Date: 2018-09-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the deficiencies of poor work flexibility and no-control fault-tolerance in existing small-piece assembly control methods, the present invention provides a fault-tolerant flexible small-piece based on cooperative Petri nets with good work flexibility and control fault-tolerance Assembly control method

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  • A fault-tolerant assembly control method for flexible small parts based on cooperative petri nets
  • A fault-tolerant assembly control method for flexible small parts based on cooperative petri nets
  • A fault-tolerant assembly control method for flexible small parts based on cooperative petri nets

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] refer to figure 1 , a fault-tolerant flexible small parts assembly control method based on cooperative Petri nets, according to the process characteristics and process requirements of small electromechanical products assembly and disassembly, a Petri net model considering the collaborative process of assembly execution is established, as shown in the attached figure 1 shown.

[0025] Based on the above model, according to different production task requirements (model, specification, etc.), the logical sequence branch of the production process task rhythm and the logical branch of the raw material combination task rhythm are given, namely the so-called sub-product Petri net and raw material flow Petri net.

[0026] Based on the principle of minimum cost, combined with the queue combination optimization method, an optimized combination process of production event...

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Abstract

The invention discloses a fault-tolerant flexible small piece assembly control method based on a collaborative Petri network. The method comprises the following steps: 1, a Petri network model general mathematical definition is given; 2, a Petri network workflow for each sub product is described as an open-chain and acyclic Petri network workflow; 3, Petri network workflows between different sub products are combined and connected, || is defined to present a sub product combination, a different sub product Petri network combination completes a different assembly collaboration process control task, and a different target product task is completed; and 4, influences on the system by raw material supply failure by the assembly system and assembly execution action not in place are characterized by a fault-tolerant scale function F(C), F(C) contains a transition link G<C><*> for the collaborative Petri network; and raw material supply failure at a certain place p during the whole process shows that delta(p) is reduced at the place p, and robustness of the assembly system is ensured through controlling the size of delta(mc). The method of the invention has the advantages that the work flexibility is good, and fault tolerance can be controlled.

Description

technical field [0001] The invention relates to the field of automated manufacturing, in particular to a fault-tolerant flexible assembly control method based on collaborative Petri nets. Background technique [0002] The assembly and process control method for complex small parts is one of the hotspots and difficulties in the field of automated manufacturing control engineering. In 2008, F.S.Hsieh et al. established a Petri net model for component assembly to analyze the assembly and disassembly process of complex mechanical components, so that the fault tolerance and robustness of the entire system operation process when raw material supply fails are effectively improved. In 2010, J.Huang et al. analyzed the assembly process of electronic circuit socket connections, and proposed an electronic device assembly method, so that the assembly system can complete the port docking of multiple transmission lines of electronic circuits. In 2011, D.J. Cappelleri and others used the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 谭大鹏张立彬艾青林
Owner ZHEJIANG UNIV OF TECH
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