中文摘要：

研究了初始安装应力对管道固有频率的影响。利用ANSYS对导管无安装应力、较小安装应力、较大安装应力的情况进行仿真分析,研究了安装应力对管道固有频率的影响;构建液压管道试验台,模拟了初始安装应力,利用锤击法对导管进行模态试验,验证了安装应力对管道固有频率的影响规律;利用锤击法对某型飞机液压管道进行了固有频率测试,试验结果进一步表明,管道安装应力的存在对管道模态频率有一定影响。研究结果为进一步开发管道安装应力监测系统提供了方法和思路。

英文摘要：

This paper investigated the effects of the pipe initial installation stress on pipe＇s natural frequencies.Simulation analyses on catheter-free assembling stress,smaller installation stress,larger installation stress were carried out by using ANSYS in order to find the effects of the pipe initial installation stress on pipe＇s natural frequencies.Then a pipeline test-bed was constructed,which was simulated the initial installation stress.The experimental modal test analysis was conducted on the pipe through the hammer method,and the results were compared with those calculated by ANSYS.Finally,modal test on the aircraft pipe was completed,and the results show that initial installation stress have certain influence on pipe＇s natural frequencies,which provides important methods and ideas for the future study of monitoring system for pipe installation stress.