Aero-engine noise measurement system and method

The invention relates to an aero-engine noise measuring system which comprises a module support, a test bed, an engine testing frame, an engine and a three-degree-of-freedom mobile measuring device. The engine is connected with the engine testing frame; the three-degree-of-freedom mobile measurement device comprises a horizontal module, a radial module and a circumferential module. The horizontal module is parallel to the axial direction of the engine, the circumferential module is arranged on the horizontal module in a sliding mode, and the circumferential module is arranged on the periphery of the engine in an arc shape; the radial module is arranged on the circumferential module, and a noise acquisition probe is arranged at the end part of the radial module; the noise measuring system further comprises an acceleration sensor, a signal collector, a computer system, a noise signal collecting and analyzing system and a three-axis module controller. The acceleration sensor is used for measuring a rotation freq