基于非线性输出频率响应函数的液压管路故障诊断研究OACSTPCD

Aviation hydraulic pipeline systems are subject to multi-excitations,including base excitation and pump-induced fluid pulsation,leading to pipeline system vibration faults frequently in engineering.In response to the difficulty in locating vibration faults in long-span pipeline systems,distributed measurement of vibration signals in long-span pipeline systems is carried out by using fiber Bragg grating(FBG)testing technology.Com-bined with the nonlinear output frequency response function(NOFRF)method,accurate positioning of clamp loosening and pipe collision faults in hydraulic pipeline systems are achieved.In this method,FBG sensors are used for distributed measurement of the vibration signals in the long-span pipeline system,which can overcome problems of electromagnetic interference and complex wiring problems in traditional acceleration testing proces-ses.The NOFRF values obtained from the collected vibration signals are used to determine the locations of loose clamps and pipe collisions,realizing early monitoring and accurate positioning of weak faults.Test results clearly demonstrate that the proposed method can effectively locate clamp looseness and pipe collision faults.