Method, device and system for monitoring torsional vibration of shaft system of plate spring damper

The invention discloses a leaf spring damper shaft system torsional vibration monitoring method, device and system, and the method comprises the steps: obtaining torsional amplitude value test values of an inner ring hub and an outer ring inertia ring of a leaf spring damper under different loads and rotating speeds, and constructing a torsional amplitude value relation library of the inner ring hub and the outer ring inertia ring under the same load and rotating speed according to the torsional amplitude value test values; and obtaining the monitored value of the torsional amplitude value of the outer inertia ring and the current corresponding load and rotating speed, and obtaining the monitored value of the torsional amplitude value of the inner ring hub under the current load and rotating speed according to the torsional amplitude value relation library. The torsional amplitude relation between the inner ring hub and the outer ring inertia ring under the same load and rotating speed is established, the tor