Research and Practical Application of Vibration Transfer Functions in Diagnostics of Jet Engine

The paper considers vibration paths properties of gas turbine engine non-rotating parts aimed for application for vibration diagnostics, specifically in Vibropassport™ as the methodical and algorithmic platform for practical application. Authors discuss reasons for transfer features research and application in vibration diagnostics. Some specialties of transfer features are considered for different types of excitation sources, like a whole rotor or separate gear. Low frequency range and wide frequency band vibrations generated by such sources need different approach to experimental testing techniques. The general view is given on experimental techniques for testing of integral aggregates and smaller excitation sources of an engine. There is analysis of transfer features of concentrated and distributed multiple sources as well as some samples of experimental testing and transfer coefficients determination. Main areas of transfer properties in application of engine vibration diagnostics are considered. The paper includes conclusions regarding discussed matters and tasks for further works.