Casing Vibration and Gas Turbine Operating Conditions

The results from an experimental investigation of the compressor casing vibration of an industrial gas turbine are presented. It is demonstrated that statistical properties of acceleration signals can be linked with engine operating conditions. The power content of such signals is dominated by contributions originating from the stages of the compressor, while the contribution of the shaft excitation is secondary. The transfer functions allow reconstruction of unsteady pressure signal features from the accelerometer readings