Abstract
Experiments and theoretical analysis were made on the unbalance vibration of the single spool turbo-jet engine JR 200 and of its simplified model which simulated vibration characteristics of the engine.
The results of theoretical analysis by the method of transfer matrix agree well with the experimental results in the case of simplified model.
In the case of JR 200 engine which has rather small length/diameter ratio, agreement of theoretical values with experimental values are not so good as in the case of the model. However, this, theoretical analysis is considered to be useful for estimating and improving vibration characteristics of a new engine, in the early stage of development.
By the experiments on the model with and without squeeze film damper bearing, it is proved that the damper of this type is very effective to reduce vibration severity at the critical speeds.
