Method for optimizing boss structure of elastic ring type squeeze film damper

By optimizing the boss structure of the elastic ring extrusion oil film damper, the blindness problem in the design process is solved, more effective vibration damping effect is achieved, and the vibration damping performance and stability of the damper are enhanced.

CN120470831APending Publication Date: 2025-08-12NORTHWESTERN POLYTECHNICAL UNIV +1
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Patent Information

Application Number
CN202510491481.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-18
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

An effective parameter optimization method has not been established in the prior art, resulting in a large blindness in the design process of elastic ring extruded oil film damper, especially the influence of key structural parameters such as boss height and width on the vibration damping characteristics of oil films shows nonlinear characteristics.

Method used

By obtaining the deformation parameters of the damper under different bearing loads, the oil film pressure field is solved using the generalized Reynolds equation and the finite difference method, the constraint function and objective function are constructed, and the boss structure is optimized by particle swarm optimization algorithm, and the boss height and width are optimized to improve the circumferential relative oil film force and reduce the radial relative oil film force.

Benefits of technology

The optimized boss structure increases the oil film damping, enhances the vibration damping characteristics, reduces the oil film stiffness, weakens the impact of the additional stiffness of the damper on the critical rotation speed, and improves the effectiveness and accuracy of the design.

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Abstract

The invention relates to the technical field of aero-engines, in particular to a boss structure optimization method for an elastic ring type squeeze film damper, which comprises the following steps: acquiring an oil film gap of the damper; corresponding circumferential relative oil film force and radial relative oil film force of the damper under different eccentric ratios are obtained; obtaining multiple groups of optimization parameters; constructing a constraint function and a target function; and obtaining an optimal optimization parameter, and obtaining an optimized boss structure. According to the optimization method, the influence of the boss height and the boss width on the circumferential relative oil film force and the radial relative oil film force is considered, and the purposes of improving the circumferential relative oil film force of the damper and reducing the radial relative oil film force of the damper are taken as targets, so that the optimized boss structure can increase the oil film damping, enhance the vibration reduction characteristic and reduce the oil film rigidity; and the influence of the damper additional rigidity on the critical rotating speed is weakened.
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