Analysis and test verification of stiffness and damping characteristics of aviation clamp with cushion

The stiffness test device of clamp with cushion was developed. The linear stiffness and torsional stiffness of different specifications of clamp were measured respectively. The measured value of clamp stiffness was introduced into the finite element model of clamp pipeline system. The error was about 5% by comparing the numerical calculation of pipeline inherent characteristics with the test results，verifying the accuracy of clamp stiffness parameters. Furthermore，a clamp damping measurement system was built，and the corresponding modal damping ratio was obtained by measuring the dynamic transmissivity of the clamp. The measured value of the clamp damping was introduced into the finite element model of the clamp pipe system. The error between the numerical calculation results and the test results was about 30%，which further verified the effectiveness of the damping measurement method. This method can provide the technical reference for design of the clamp support of aviation complex pipeline system.