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Modeling Method for Energy-saving Scheduling of Mixed Flow Workshop Considering Shutdown and Restart Strategy

A modeling method and restart technology, applied in control/regulation systems, program control, instruments, etc.

Inactive Publication Date: 2019-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a modeling method for energy-saving scheduling of mixed flow workshops considering shutdown and restart strategies, and its purpose is to solve the technology of unrelated parallel machine flow shop scheduling after considering shutdown and restart strategies question

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  • Modeling Method for Energy-saving Scheduling of Mixed Flow Workshop Considering Shutdown and Restart Strategy
  • Modeling Method for Energy-saving Scheduling of Mixed Flow Workshop Considering Shutdown and Restart Strategy
  • Modeling Method for Energy-saving Scheduling of Mixed Flow Workshop Considering Shutdown and Restart Strategy

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no. 3 example

[0194] Model 3: figure 2 The flow chart of the third embodiment of the modeling method for energy-saving scheduling of mixed flow workshops considering shutdown and restart strategies provided by the present invention. The modeling method includes the following steps:

[0195] Introduce decision variables:

[0196] Processing machine tool occupied variable X i,k , indicating whether the i-th workpiece is processed on the k-th machine tool, where

[0197] Processing position occupied variable Y i,k,t , indicating whether the i-th workpiece is processed at the t-th position on the k-th machine tool,

[0198] Shutdown restart policy variable Z k,t , indicating whether to implement a shutdown and restart strategy between the t-th position and the t+1-th position on the k-th machine tool, where,

[0199] Workpiece phase end time variable E i,j , indicating the end time of the j-th processing stage of the i-th workpiece.

[0200] Artifact phase start time variable B i...

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Abstract

The invention discloses a modeling method for hybrid flow shop energy-saving scheduling by considering a shutdown and restart strategy, which comprises the steps of introducing a machining position ending time variable, a machining position starting time variable and a shutdown and restart strategy variable, building a model based on the idle time, further introducing a standby energy consumptionvariable between two adjacent positions on a machine tool, and building a model based on the idle energy consumption; building five mixed integer linear programming models considering the shutdown andrestart strategy; then performing detailed comparative analysis on the mathematical models from the aspects of the modeling process, the model size complexity, the calculation complexity and the like; solving an HFSP (Hybrid Flow Shop Scheduling Problem) example by using a CPLEX solver, and proving the correctness and the effectiveness of the MILP (Mixed Integer Linear Programming) model. Experiments show that MILP models based on different modeling ideas are greatly different in size complexity and calculation complexity, and the solving effect of the MILP model based on the idle energy consumption is better than that of the MILP model based on the idle time.

Description

technical field [0001] The invention belongs to the technical field of computer integrated manufacturing, and more specifically relates to a modeling method for flow shop scheduling of uncorrelated parallel machines considering shutdown and restart strategies. Background technique [0002] Hybrid flow shop scheduling problem (Hybrid flow shop scheduling problem, HFSP) is the most widely used scheduling problem, such as chemical industry, metallurgy, textile, machinery, semiconductor, logistics, papermaking, construction and many other fields can be attributed to HFSP problem . Due to the existence of parallel machines in different processing stages, the solution space becomes very large. Compared with the flow shop scheduling problem, it is a more complex NP-hard problem. HFSP is divided into three categories according to the type of parallel machines: HFSP with identical parallel machines (HFSP-IPM), HFSP with uniform parallel machines (HFSP-UM) and HFSP with unrelated par...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCG05B19/41885G05B2219/32339
Inventor 孟磊磊邵新宇张超勇任亚平罗敏戴稳任彩乐肖鹏飞
Owner HUAZHONG UNIV OF SCI & TECH
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