摘要：Accurately solving transient nonlinear inverse heat conduction problems in complex structures is of great importance to provide key parameters for modeling coupled heat transfer process and the structure’s optimization *** finite element method in ABAQUS is employed to solve the direct transient nonlinear heat conduction *** particle swarm optimization(PSO)method is developed and used to solve the transient nonlinear inverse *** investigate the inverse performances,some numerical tests are *** conditions at inaccessible surfaces of a scramjet combustor with the regenerative cooling system are inversely *** results show that the new methodology can accurately and efficiently determine the boundary conditions in the scramjet combustor with the regenerative cooling *** solving the transient nonlinear inverse problem,the improved particle swarm optimization for solving the transient nonlinear inverse heat conduction problem in a complex structure is verified.