Targeting the structural and mechanical characteristics of aero-engine bearing system

a structural efficiency evaluation method was proposed based on the system's structural function and design requirements. Stress distribution coefficient

vibration equivalent specific stiffness

stiffness sensitivity to temperature

and isolation coefficient were used to assess the bearing capacity

resistance to deformation and dynamic environment adaptability of the structure. A structural efficiency assessment on two design schemes of the turbine inter-stage bearing frame for turbopropeller engine was conducted. Result indicates that the structural efficiency of design A is 39.6% greater than design B. Those assessment parameters are at a reasonable level

and can quantitatively reflect the advantages and disadvantages of two schemes. The result proves the validity of the assessment method.