Advanced analysis and optimization of nonlinear resonance vibrations in gas-turbine structures with friction and gaps

A methodology is developed for analysis and the global optimization of resonance peak forced response levels and frequencies. Essentially nonlinear vibrations of gas-turbine structures with friction and gap contact interfaces are considered. The methods developed allow effective analysis for large-scale finite element models containing millions of degrees of freedom and detailed description of friction contact interfaces in jointed structures. The resonance peak characteristics can be calculated directly as functions of design parameters and excitation. The efficiency of the methodology is demonstrated on a representative set of practical test cases