A Multi Parameter Synchronous Identification Method for Stiffness and Damping of Single Fixed Clamp Based on Pareto Algorithm

As a composite structure, the single fixed clamp (SFC) is an important supporting component of the aeroengine piping system. The dynamic parameters (stiffness and damping) of SFC have significant differences in bolt direction and opening direction. Accurately identifying the dynamic parameters of an SFC in both directions is of great significance for the study of pipeline system dynamics. At present, there is very little research on the identification of dynamic parameters for such SFC. Therefore, an SFC-straight pipe structure for identifying the dynamic parameters of an SFC is proposed in this paper. In this structure, one end of the straight pipe is completely fixed, and the other end is supported by an SFC. This structure can better reflect the working state of the SFC. A dynamic model of this structure is established based on the finite element method for parameter identification of SFC. In the finite element model (FEM), the constraint effect of the SFC is simplified into two identical spring-damping groups. Considering the structural asymmetry, spring and damping parameters for bolt direction and opening direction are separately set in each spring damping group. Next, based on the Pareto multi-objective genetic algorithm, an identification algorithm and procedure for the stiffness and damping of the SFC using modal test data as input parameters are proposed. Through experimental testing, parameter identification is carried out for DK8 type SFC, and a straight pipe experimental structure completely supported by two SFCs is constructed to verify the correctness of the identification results.