Research On Optimization Of Piping And Clamp Layout For Complex Equipment Considering Vibration

The pipe system of complex equipment such as aero-engine is composed of hundreds of pipes fixed by clamps.The arrangement of pipes and clamps has important influence on the design period and vibration performance of the pipe system.There is assembly constraint relation and coupling between pipe and clamp,so the design process is very complicated and time-consuming.In this paper,an optimization method for the arrangement of aero-engine pipes and clamps considering vibration is proposed,which is based on engineering constraints,experts’ experience,approximate model and intelligent optimization,etc.The question of pipe and clamp layout is analyzed systematically and the optimization algorithm of pipe-clamp layout is established in the aspects of geometric design and natural frequency optimization.Finally,the feasibility is verified by the layout example.In the aspect of geometric design optimization,a pipe-clamp heuristic layout algorithm of aero-engine based on engineering rules and experts’ experience is proposed.Firstly,according to the assembly constraint relationship between pipe and clamp,the "Clamp-based path pattern" is established to ensure that the layout scheme meets the assembly constraint relationship of pipe,clamp and gearbox.Secondly,the heuristic search algorithm framework of pipe clamp layout scheme is established by learning experts’ experience.So the problem is divided into three sub-problems:shortest pre-planning path,clamp layout and pipe path optimizing.Thirdly,when optimizing the pipe path,the "A pattern exploration method " is put forward to search the optimal solution quickly,based on the "Clamp-based path pattern".When the algorithm is used to arrange the clamp,the expert’s experience in vibration optimization is integrated,and the optimization of pipe-clamp layout considering vibration can be realized preliminarily.In order to improve the stability of the pipes,a pipe-clamp layout optimization method based on improved Kriging model and particle swarm optimization(Particle Swarm Optimization,PSO)is proposed,which avoids resonance between the pipes and the equipment.Based on the preliminary scheme of pipe-clamp path,the method takes the position and rotation angle of clamp as decision variables and the difference between the first-order natural frequency of pipe and engine frequency as the main optimization objective.Then the particle swarm optimization algorithm is applied to optimize the pipe path to achieve the natural frequency optimization and avoid resonance based on the preliminary scheme of the pipe-clamp layout.In order to improve the calculation efficiency,Kriging model is established used to replace the time-consuming analysis program,which reflects the relationship between the pipe-clamp layout and the natural frequency of the pipe.At the same time,in order to improve the precision of Kriging model,BAS-PSO(Beetle Antennae Search-Particle Swarm Optimization,BAS-PSO)is proposed to optimize the parameters of Kriging model.In terms of platform implementation and example verification,considering the industry practice and software features,Siemens NX is used to complete CAD modeling,Matlab is used to realize algorithm programming and scientific calculation,the two realize data interaction through TXT.In the aspect of model analysis,the ANSYS Workbench is used to complete the natural frequency analysis of pipe and the collection of sample points,which provides the preliminary data basis for Kriging model.The algorithm proposed in this paper is realized based on above platforms,and the feasibility is verified by examples.Finally,some conclusions and future work prospects are given.