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Actually small imbalances are accounted for in the design process. Engines are always out of balance, or perhaps better said, an engine is never perfectly balanced. They are designed for all sorts of conditions that are not ideal. As to simulating things at certain frequency (rpm as you put it) is not particularly difficult. The goal of doing any sort of vibration analysis (not engine specific) is not actually simulating the part moving around at some frequency (think of a super slow motion of a part moving back and forth), but analyzing the dynamic loads and how often they occur in comparison with a load that is constantly applied. Hence you will have a steady load and an oscillating load if you will. Then you reference the material properties for that given steady load and oscillating load for a given temperature. The terms "Goodman diagram" or "Constant Life diagram" are good terms to search for something like this.As to simulating interaction with the airframe, this too is similar to any sort of other analysis. There are just lots of load cases that you have to deal with.
Actually small imbalances are accounted for in the design process. Engines are always out of balance, or perhaps better said, an engine is never perfectly balanced. They are designed for all sorts of conditions that are not ideal.
As to simulating things at certain frequency (rpm as you put it) is not particularly difficult. The goal of doing any sort of vibration analysis (not engine specific) is not actually simulating the part moving around at some frequency (think of a super slow motion of a part moving back and forth), but analyzing the dynamic loads and how often they occur in comparison with a load that is constantly applied. Hence you will have a steady load and an oscillating load if you will. Then you reference the material properties for that given steady load and oscillating load for a given temperature. The terms "Goodman diagram" or "Constant Life diagram" are good terms to search for something like this.
As to simulating interaction with the airframe, this too is similar to any sort of other analysis. There are just lots of load cases that you have to deal with.
