Research On The Production System Of Surface Mine Modeling And Optimization Method Based On Process Hybrid Petri Nets

As mine production became mechanized and scaled, open-pit mine production system formed a complex system including mixed discrete process and continuous process, qualitative and quantitative problems. This paper based on the summarization of main research method in hybrid system, improved the hybrid Petri nets and drove the process hybrid Petri net, which is able to fit the mine production practice. Process hybrid Petri net has the same basic properties as the normal hybrid Petri net, but it has the process control library and introduces the control flow relationship and inhibits flow relationship to optimize the control to stimulate change. Combining the advantages of chaotic search algorithm and genetic algorithm, paper proposed the new genetic algorithm based on chaotic search mechanism. Through the decomposition of the main open pit mining technology, paper proposed a hierarchical model of open-pit mine production system. Combined with simulation optimization algorithm based on hybrid Petri nets and process mathematical model, methods and steps of static modeling was given in this paper; combined with hybrid Petri nets, experience rules time logic tree and logical model, this paper also put forward a improved simulation optimization method. The research result through the successful application of bucket wheel excavator continuous process system in Heidaigou open pit mine and electric shovel truck process system in Prominent Hill open pit mine, proved that it obtained the important theory significance on the production system of open pit mine modeling and optimization.Paper focused on the modeling and optimization of open-pit production system, research includes following aspects:(1) Paper systematically summarized and analyzed the characteristics and advantages of basic Petri net and extended Petri net. Based on the characteristics of open pit mine production system, the hybrid Petri net was improved, a hybrid Petri nets based on process was presented. An improved hybrid Petri net which can accurately describe the open-pit mine production system and effectively control the production process was to meet the system dynamic modeling and scheduling requirements. The process Petri net is a kind of graphical modeling tool which can be used to analyze the mechanism and correlation of the system and analyze the state of the system through the system reachability tree and state transition matrix. System static model and dynamic model are based on the process Petri net. Computer simulation and optimization system model can be further carried out via using GPSS simulation language.(2) Paper based on the 3-stage thinking disassembled the open pit production system into system logic layer, basic structure layer, main device layer, constituting the disintegration model of open pit production process systems. Based on disintegration modelandmajorequipmentofproductionsystemascore,combinedwiththespecificcompositionofmechanismandthenatureofequipmentoperationstodisintegratemineproductionprocesssystemsintominingloadproductionsubsystem,productionandtransportsubsystem,storagesubsystem,constitutingthelevelhierarchicalmodelofopenpitproductionprocesssystem.thegm'sprocessofhybridpetrinetmodelwasbuilttoprovidemeasuresforthesolvingandextendingofthemodel.(3)staticmodelstudiedonthecurrentconfigurationandoperationofproductionsysteminordertomaximizeproductivityandachieveoptimalproductioncostsfortheresearchobjectives,coordinateandbalanceproduction,makingtheproductionprocessesoptimized.paper,reliedonthischaracteristic,analyzedtheconstraintsofopenpitproductionprocessmodelandsetsystemconstraintsandtheobjectivefunctionfromproductionequipmentcapacity,storageequipmentcapacity,productiontechnologysectors,planningproduction.thecompleteprocessofhybridstaticmodelbasedonpetrinetofproductionsystemisconstitutedbyconnectingtheprocessofhybridpetrinetmodelofminingloadprocess,transportprocess,storageprocess.(4)paperputforwardthecombinationofchaoticsearchalgorithmandgeneticalgorithmtosolvethenonlinearmodelofmineproductionsystembasedonprocesshybridpetrinets.thealgorithmmainlyappliedthelocalsearchabilityofchaoticalgorithmtoguidethelocaloptimalsolutionofconstantevolutiontogettheoptimalsolution.thisalgorithmovercamethecharacteristicsofnonlinearobjectivefunctionandwasabletogetapluralityofpossibleoptimalsolutionsbyparallelprocessing.inaddition,thealgorithmovercametheshortcomingofslowconvergencespeedofgeneticalgorithm.bysolvingthetypicalfunctionverifiedthatthisalgorithmforsolvingandoptimizingthemodelwasvalid.(5)paperappliedthestaticmodelingofprocesshybridpetrinetstomodelandanalyzeheidaigouopenpitminebucketwheelcontinuousproductionsystem,establishedthebucketwheelexcavatorprocesshybridpetrinetsmodeltoconcludetheprobabilityofeachsetofbucketwheelequipmentfailureandthenormaloperation,calculatedtheproductioncapacityofbucketwheelsystemunderthecurrentarrangement.basedoncalculation,conclusionwasobtainedthatthecurrentbucketwheelsystemproductioncapacitywasunabletomeettheneedofproductionplan.(6)giventhatopenpitproductionsystemssuffersfrommanyunexpectedsituations.componentsformingtheproductionsystemwerenotasstableasthestaticmodelandtheproductionsystemupdatedaccordingtoreal-timeschedulingandstatus.tosolvethefeatureabove,paperproposedthedynamicoptimizationmethodsofopenpitproductionsystembasedonprocesshybridpetrinetanddesignedthedynamicoptimizationofthestructureoftheproductionsystem.combinedwithmathematicalmodel,simulationmodelandtheruleofthumb,paperputforwardeventlogictreeandeventlogicmodelforthedynamicanalyzingandoptimizingtheproductionsystem.(7)paperanalyzedadelaideprominenthillopenpitshovelandtruckproductionsystembyhybridpetrinetsdynamicprocessmodelingandoptimization.byaddingdynamicschedulingrulesofthumb,paperanalyzedtrucksconfigurationinthissystemandobtainedthebestoptimalnumberoftrucksincurrentproductionconditions.papersimulatedandcalculatedthecurrentsystemwhichincreasedtheautomatictruckdispatchingsystem,theresultsshowedasubstantialdeclineintheshovelqueueabout50%,butthesystemofproductioncapacityincreasedonlyby5%,whichindicatedthatthemainfactoraffectedtheabilityofthecurrentsystemwasnotschedulingtrucks.inordertoimprovethestrippingabilityofthethirdstageoverburdenrocks,papersimulatedthesystembyincreasinganelectricshovel,studiedthesysteminthesituationincludingtheschedulingsystemandashovel,theresultsshowedtheopen-pitshouldpriorityaddastrippingshovelinordertoincreasestrippingabilityinpriority.thispapermadethefollowingconclusionsthroughtheoreticalanalysisandpractice:(1)combinedwiththeactualsituationoftheopenpitproductionsystem,paperanalyzedthelimitationsofthehybridpetrinetintheopenpitproductionsystemmodeling.tomeettheneedsoftheactualproductionprocessmodelinginopenpit,paperputforwardprocesshybridpetrinetswhichbasedonhybridpetrinetandincreasedtheprocesscontrolplace.inaddition,paperproposedtherelateddefinitions,firingrules,dynamicnature,mainfeaturesandotherrelatedcontents.(2)paperdecomposedthemainprocesssystemofopenpit,whichwasdividedintothreebasicmodules:extractingandloadingsubsystem,transportingsubsystemandstoragesubsystem.paperpresentedthehierarchicalmodelofopenpitproductionsystemhierarchicalstructuremodelingandtheexpressionsofprocesshybridpetrinetsofmainequipment.(3)foropenpitproductionsystemmodelingofnonlinearbasedonprocesshybridpetrinet,combinedwiththeadvantagesofgeneticalgorithmandchaoticsearchalgorithm,paperproposedanewgeneticalgorithmbasedonthechaossearchmechanismandtheoptimizationprocess.(4)paperanalyzedthecharacteristicsofopenpitproductionsystems,combinedprocesshybridpetrinetandmathematicmodel,proposedstaticsystemsimulationandoptimizationmethod.bycombiningprocesshybridpetrinet,experienceruleeventlogictreeandeventlogicmodel,paperproposeddynamicsystemsimulationandoptimizationmethod.