Based on actual aircraft hydraulic pipeline as the research object,using Ansys to simulate initial installation of pipeline stress. Pipeline installation stress have three conditions, including stress is very large, installation stress is medium and installing stress is small, and then the three cases are discussed. When the pipeline installation stress is large, the pipeline will produce plastic deformation, leading to the elastic modulus change; when the pipeline installation stress medium, pipe is in the range of elastic deformation and the pipeline will produce very small deformation; when the pipeline installation stress is small,tubular and modulus of elasticity are not change. Through modal analysis,when the pipeline installation stress is very large and the installation stress is medium, each ordered inherent frequency of pipeline changed,when installing the stress is very small,the natural frequency of the pipe does not change. Through the analysis for simulation initial installation of pipeline stress, it will provide a theoretical basis for pipeline installation stress monitoring system.%以实际的飞机液压管道为研究对象,使用软件ANSYS对管道进行初始安装应力仿真.将管道的安装应力分为安装应力很大、中等和较小的情况进行讨论.当管道的安装应力很大时,管道产生塑性变形,局部弹性模量发生变化；当管道的安装应力中等时,管道处于弹性变形范围内,管道产生很微小的变形；当管道的安装应力较小时,管形和弹性模量均不变化.通过模态分析得出,当管道安装应力很大和安装应力中等的情况下,管道的各阶固有频率发生不同程度的变化,当安装应力很小时,管道的固有频率不发生变化.这一结论可以为构建管道安装应力监测系统提供理论依据.
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