The paper presents a study on the sensitivity analysis of squeeze film dampers for aircraft engine rotors. Sensitivity functions provide an information on derivatives of squeeze film damper performance characteristics in respect to damper parameters, i.e. design variables. Sensitivity analysis is used as a part of a gradient-based optimization as well as an independent tool to guide design engineer. The squeeze film damper (SFD) model is based on the Reynolds equation which is solved numerically by applying the finite element method. Damper stiffness and damping coefficients are calculated using a finite perturbation method. Variation of state variable (oil film pressure in the Reynolds equation) is calculated by introducing adjoint variables. Calculation of derivatives is performed in analytical form. The analysis is applied to a squirrel cage SFD installed in a turboprop engine. Sensitivity coefficients for the SFD with end seals and open ends are presented. Direct stiffness and direct damping coefficients are selected as performance characteristics. Design variables are length and diameter of the damper, mean radial clearance, oil inlet pressure and dynamic viscosity, shaft eccentricity, and whirl frequency. Studied SFD designs demonstrate partially different sensitivities to design variables.
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The paper presents a study on the sensitivity analysis of squeeze film dampers for aircraft engine rotors. Sensitivity functions provide an information on derivatives of squeeze film damper performance characteristics in respect to damper parameters, i.e. design variables. Sensitivity analysis is used as a part of a gradient-based optimization as well as an independent tool to guide design engineer. The squeeze film damper (SFD) model is based on the Reynolds equation which is solved numerically...
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