| Hydraulic pipelines play a vital role in many fields such as aerospace and aviation.In order to ensure their high reliability and high efficiency,it is an indispensable link to study their vibration characteristics.However,the CAD model cannot directly perform mechanical analysis to evaluate the strength of the pipeline structure.The manual modeling process from CAD to CAE model has a high repetition rate and low efficiency,and involves cumbersome analysis and calculation.Therefore,design a software platform that integrates some functions of CAD and CAE,completes the automatic modeling of CAD to CAE model,conducts dynamic simulation analysis and post-processing view,improves the work efficiency of pipeline structure design,and has important engineering application value.According to the software platform requirements and design goals,the paper carries out the overall design of the integrated development of aircraft hydraulic pipeline CAD/CAE.The paper studies the automatic extraction technology of CAD model information of typical aircraft hydraulic pipeline structure and the automatic packaging of simulation analysis and post-processing results.The design of simulation analysis software platform.The specific research content and work of this paper are as follows:(1)The overall design of CAD/CAE integrated development is completed according to the goal of CAD/CAE integrated development and design of aircraft hydraulic pipelines.According to the requirements and feasibility of the integrated development of CAD/CAE for aircraft hydraulic pipelines,it is analyzed and the functional requirements that the software platform needs to meet are clarified.According to its functional requirements,the design goals of the CAD/CAE integrated development of aircraft hydraulic pipelines are discussed and summarized.Finally,combined with the previous analysis and design goals,the overall design of the software platform is obtained,and the secondary development method of CATIA is studied.VB 6.0 is established as the development environment.Automation is the secondary development method for CATIA,and APDL is the secondary development method for ANSYS.(2)The mapping data extraction technology from the CAD model of the aircraft hydraulic pipeline structure to the CAE model is studied.Since the CAD model in CATIA cannot be directly used for CAE analysis,it is necessary to simplify the model,remove unnecessary details,and complete the CAD to CAE mapping modeling.In this paper,the method of starting and ending points of straight pipes is used to extract the geometric information of the hard pipe,the geometric information of the hose is extracted by the evenly divided centerline,and the corresponding data extraction technology is used to obtain the coordinate information of the characteristic points of different auxiliary parts in the sketch.Based on the coordinate mapping,the global coordinates of the auxiliary parts of the pipeline are obtained.(3)The technology of realizing simulation analysis automation and post-processing result viewing based on VB are studied.The batch technology of ANSYS is used to call ANSYS,and at the same time,the method of obtaining Windows interface is applied.According to the window handle,the working interface of ANSYS is embedded in the graphics space of the software platform to realize the visualization of the interface.Using batch processing technology,applying VB programming,calling ANSYS Mechanical module to complete the automatic realization of modal analysis and random analysis,and calling ANSYS CFX module to complete the automatic realization of transient analysis.Based on VB6.0,the functions of ANSYS simulation calculation and post-processing result viewing are subpackaged,which simplifies the tedious operation of simulation calculation.(4)The function of the software platform is verified based on a simulation case of a certain aircraft hydraulic pipeline.This paper selects a certain aircraft hydraulic pipeline model to complete the simulation case analysis.The data of CATIA model information was extracted on the software platform,and the selection and addition of pipeline structure materials and the input of necessary parameters for each simulation analysis were completed;the calculation of each simulation analysis was carried out,and the analysis of each analysis module was completed in a batch process.Finally,I checked the calculation results of each analysis module concerned,and evaluated the rationality of the pipeline structure.The function of the software platform for piping structure vibration simulation is verified. |
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