Abstract
In order to demonstrate the noise reduction technology for aero engines such as acoustic liner panel or noise reduction exhaust nozzle, Japan Aerospace Exploration Agency (JAXA) has introduced a small turbofan engine and conducted outdoor noise measurement tests. One of the most important phenomena during the engine operation is vibration of the engine and its test equipment. Excessive vibration causes damage or deviation of parts, and if the fragments collide with rotating blades or combustors, it will cause a fatal damage to the engine. In this study the vibration characteristics of the engine and its equipment are investigated by the order analysis. The results show that engine vibration is dominantly caused by the rotations of both fan and high-pressure shaft while vibration of engine stand is excited at its eigen-frequency.
