Abstract: Based on the analysis of uncertain factors affecting the vibration reliability of blade, the uncertain property of the frequency zone of resonance and the vibration parameters of blade is described by the non-probabilistic convex models, the uncertain vibration parameters of blade is expressed as non-probabilistic interval variables, the non-probabilistic vibration reliability of blade is defined, the non-probabilistic reliability assessment system and method and model of blade vibration is presented, and is applied to the vibration reliability computing of compressor vane and turbine blade. It is proved by the research result that the test data needed is few and the non-probabilistic reliability is feasible and reasonable for vibration reliability assessment of blade, especially for those costly parts or system whose reliability data is most few such as aero-engine.

Key words: Assessment method, Non-probabilistic Blade, Vibration reliability