Complicated Equipment Pipe And Clamp Layout Considering Assembly Constraints GWO Optimization

Complex equipment such as the external pipe system of aero-engine is composed of hundreds of pipes and clamps that meet the assembly constraint rules,among which the reasonable pipe and clamps layout has an important influence on the vibration and design efficiency of complex equipment.Because of the assembly constraint relationship between pipe,clamp and casing,the design process of pipe is very complicated and time-consuming.In this paper,under the constraints of basic engineering rules,the geometry layout and vibration optimization design of pipe-clamp are studied and explored by using intelligent optimization and approximate model.An improved Gray Wolf Optimization（GWO）algorithm was proposed to optimize the layout of pipe-clamp geometry.Taking the pipe length as the optimization objective and reasonable obstacle avoidance as the constraint condition,the length of the broken code and the rotation angle of the pipe and the clamp were constrained,and finally a turning point of the winding path was obtained.At the same time,in order to improve the search performance of GWO,the convergence factor is improved.An improved GWO optimization algorithm was used to obtain the primary layout design of the pipe-clamp,so as to achieve the purpose of optimizing the spatial layout of the pipe-clamp.In order to further improve the stability of the pipe-clamp system and avoid resonance with the engine.An optimization method for secondary layout design of pipes and clamps based on Kriging model and improved gray Wolf algorithm was proposed.Kriging model and improved GWO optimization algorithm were used to optimize and adjust the clamp position.Based on the existing pipe-clamp geometric layout scheme,the main optimization objective is to adjust the natural frequency of the pipe-clamp to avoid resonance,and the constraint conditions are to avoid obstacles and satisfy the assembly constraints of the pipe-clamp.The improved GWO algorithm was applied to carry out the secondary optimization adjustment of the clamp position.Considering the assembly constraint relationship between clamp and pipe,and in order not to affect the geometric layout scheme of pipe,the optimization space of clamp position based on pipe projection line was established.In order to improve the calculation efficiency,a Kriging surrogate model reflecting the clamp position and natural frequency of the pipe was established to replace the finite element calculation program in the optimization process.The method can optimize the position of the clamp on the premise of ensuring fine tuning of the geometric layout of the pipe,and ensure that the assembly constraint relationship between the pipe and the clamp is satisfied,so as to realize the secondary optimization design of the pipe-clamp layout.In the aspect of algorithm realization and system development,taking into account the industry practice and characteristic software,the CAD model is established with Siemens NX software.MATLAB software was used to implement and calculate the algorithm,and the software interaction was realized through TXT text data.Siemens NX/ GRIP secondary development program was used to complete the visualization of the layout design scheme of the pipe-clamp.In order to establish the sample space of Kriging model,In order to establish the sample space of Kriging model,ANSYS Workbench 17.0 finite element analysis software was used to analyze and calculate the sample response value.All the algorithms in this paper are implemented on the above system platform,and the feasibility of the algorithm was finally verified by an example of pipe-clamp layout.