Research On Multi-Objective Optimization Of Pipe System Layout Design For Complex Equipments

Pipe-routing design is a key link in the overall design of complex equipments,and its design quality has a serious impact on the performance and reliability of equipments.In pratice,the pipe-routing design of complex equipments is done mainly by human-computer interaction.The tradtional method is highly dependent on the experience of designers,very complex and time-consuming,which not only makes it difficult to obtain the optimized pipe-routing of complex equipment,but also difficult to meet the development needs of complex equipment industry.Because the pipelines in aeroengine are numerous,complicated and laed in thesmall space,this paper takes the pipe system in aeroengine as the research object,and studies the methods of its multi-objective optimization layout design.The main research contents are as follows:(1)Firstly,the source,research background and significance of the topic are introduced.Then,research works about spatial preprocessing,single pipe-routing,branch pipe-routing and multi-pipe-routing for complex equipment at home and abroad is analyzed,and the existing problems in the current research are summarized.On this basis,main content of this paper is given.(2)Aiming at solving the existing problems of space preprocessing for aeroengine,a novel space preprocessing method is proposed.In the method,obstacle information in the layout space is extracted based on STEP AP214 file.Then,the obstacle bounding box is established based on the seperation-simplification-recombination strategy.Next,the information extraction of the layout space is realized based on grid partitioning.Finally,an example is given to verify the feasibility of the method and the accuracy of extracting layout spatial information.(3)For the existing problems in the single pipe-routing between two pipe endpoints,an intelligent single pipe-routing method for aeroengine based on improved multi-objective firefly algorithm is proposed.In the method,considering the pipeline length,the number of elbows and the value of energy as the optimization objectives,and the engineering rules of pipe-routing as constraints,a multi-objective optimization mathematical model of single pipe-routing is firstly established.On this basis,a multi-objective evaluation function is established based on non-dominated ranking,constraint violation value and crowding strategy.Furthermore,combined with Pareto theory,elite strategy and adaptive perturbation,an improved multiobjective firefly algorithm for the intelligent single pipe-routing is proposed and used to obtain the divese and optimized single pipe-routing of aeroengine.Finally,an example is given to verify the proposed method.(4)In order to solve the existing problems in the branch pipe-routing among multiple pipe endpoints,an intelligent branch pipe-routing method for aero-engine based on Steiner tree and improved multi-objective firefly algorithm is designed.In the method,considering the pipeline length,the number of elbows and the number of branches as the optimization objectives,and the engineering rules of pipe-routing as constraints,a multi-objective optimization mathematical model of branch pipe-routing is firstly established.On this basis,combined with Steiner tree,chaos algorithm and single pipe-routing method,an improved multi-objective firefly algorithm for the intelligent branch pipe-routing is designed and used to obtain the divese and optimized branch pipe-routing of aeroengine.Finally,an example is given to verify the method.(5)Aiming at handling the existing problems of multi-pipe-routing,an intelligent multipipe-routing method for aeroengine based on improved multi-objective firefly co-evolutionary algorithm is proposed.In the method,considering the pipeline length,the number of elbows and the value of energy as the optimization objectives,and the engineering rules of pipe-routing as constraints,a multi-objective optimization mathematical model of multi-pipe-routing is firstly established.On this basis,combined with co-evolutionary algorithm,single pipe-routing method and branch pipe-routing method,an improved multi-objective firefly co-evolutionary algorithm for the intelligent multi-pipe-routing is proposed and used to obtain the divese and optimized multi-pipe-routing of aeroengine.Finally,an example is given to verify the proposed method.(6)Based on the above methods,this paper designs and develops the prototype system of multi-objective optimization piping system layout design for complex equipments,which includes space information extraction module,single pipe-routing optimization module,the branch pipe-routing optimization module,the multi-pipe-routingoptimization module and piperouting visualization module,which realizes the intelligent pipeline layout and its visualization.