Method and system for determining position of aero-engine complete machine vibration sensor

The invention relates to a method and a system for determining the position of an aero-engine complete machine vibration sensor. The method comprises the steps that a finite element model of a whole machine stator casing of the aero-engine is established, and an alternative node set of a whole machine vibration sensor is set; modal analysis is carried out on the finite element model, harmonic response analysis is carried out on the finite element model, and a parameter response curve of each node in the alternative node set is obtained; nodes belonging to a local mode are removed from the alternative node set; the parameter response curve of each node in the alternative node setis counted, and a target optimization function is established according to the obtained statistical data; a target optimization function value is calculated corresponding to each node in the alternative node set, and the nodes are sortedaccording to the numerical value of the target optimization function value;and the setting position