Intelligent Layout Optimization Method For Complex Equipment Pipes And Clamps

Aero-engine Pipe-Clamp System(PCS)consist of a number of pipes fixed by clamps.The research shows that the reasonable intelligent layout optimization of pipes and clamps have an important impact on improving product stability and design efficiency.The main layout goal of PCS is to appropriately pave pipes and assemble clamps in a specific contained space while considering certain optimization objectives and engineering constraints.In particular,because of assembly constraints and optimization requirements,there is usually a coupling relationship between the pipe layout and the clamp arrangement,which often results in repeated modifications between the pipe layout and the clamp arrangement design.In the optimization design of the pipe system existing at this stage,there is little overall optimization of pipe layout and clamp arrangement.The traditional serial design method only conducts research on pipe layout,and does not consider the clamp arrangement at the same time.The pipe layout and the clamp arrangement are carried out separately,which makes it difficult to achieve the overall optimal pipe layout and clamp arrangement.This paper takes the aero-engine as an example.From the perspective of the system,the pipe and the clamp are regarded as a whole,and the decoupling design is designed for the coupling relationship between the traditional pipe layout and the clamp arrangement.Mainly completed the following work:(1)Introduced the optimization goals and engineering constraints of pipe layout and clamp arrangement,analyzed the coupling relationship between pipe layout and clamp arrangement,and the pipe path model considering the clamp is established based on engineering and expert experience,and the calculation and solution of the spatial clamp posture coordinate transformation.(2)From the perspective of single-objectiveoptimization,a PCS layout method based on Particle Swarm Optimization(PSO)is proposed.On the basis of considering the pipe path mode of the clamp,the pipe path node information,the number of clamps,the geometric position of clamp and the spatial posture parameters of clamp are used as decision variables and a fixed-length coding design is carried out.The Pipe length,smoothness and number of clamps are taken as optimization goals,and the linear weighting method is used to convert the multi-objective problem into a single-objective problem.The obstacle avoidance and clamp layout constraints are considered in an integrated manner.Finally,the pipe layout and clamp arrangement scheme are solved by the PSO algorithm.(3)The above single-objective method is extended to the multi-objective optimization situation,and a PCS multi-objective layout method based on improved MOPSO is proposed.The Latin hypercube sampling method is used to improve the population distribution of MOPSO to improve the global search performance of MOSPO.At the same time,the same coding mechanism,decision variables and optimization goals as in the single-object layout method are used,and the improved MOPSO algorithm is used to solve the Pareto solution set of pipe layout and clamp arrangement scheme.This paper fully considers industry conventions and software features in terms of system platform and algorithm implementation,uses Siemens NX to complete the CAD modeling of the laying model,uses Matlab software to implement algorithm programming and calculation,and communicates between them through TXT text.At the same time,this paper uses the Siemens NX / GRIP secondary development language to realize the reading of CAD model geometric information and the visualization of pipe layout results.Finally,the feasibility of the proposed method is verified by laying examples.