To create the dynamic model of the aeroengine pipeline system effectively

it is necessary to obtain mechanical characteristic parameters of the hoop such as the support stiffness and damping under dynamic load. An inversed method for identifying the support stiffness and damping was proposed based on the measured frequency response function (FRF). The inverse identification procedure was determined for the single pipeline supported by double hoops. The dynamic model of the pipeline system were created by the developed finite element method

and the formulas of solving the FRF of pipeline system was also given. The inverse identification algorithm based on sensitivity analysis was proposed to identify the stiffness and damping of the pipeline hoop. A typical pipe hoop was chosen as an example to obtain the support stiffness and damping. The identified mechanical characteristic parameters of the hoop were inputted into the created finite element (FE) model. It was found the relative errors between calculated and measured natural frequency and corresponding FRF were less than 9%. Then

the rationality of the developed identification method was validated. In addition

the identification results indicate that the support stiffness and damping of the hoop are frequency dependent

and the horizontal and vertical values of these parameters are different.