Commercial vehicle cab fatigue durability analysis method and system

The invention discloses a commercial vehicle cab fatigue durability analysis method and system, and the method comprises the steps: building a cab finite element model according to a geometric model of a commercial vehicle cab, and obtaining a cab inertia release result according to the cab finite element model; performing grid division flexible processing on a preset frame to establish a frame flexible finite element model, and generating a cab-frame rigid-flexible coupling multi-body dynamic model according to the frame flexible finite element model; according to the cab-frame rigid-flexible coupling multi-body dynamic model and the cab suspension characteristic road spectrum test, a fatigue load spectrum of cab-frame parts is obtained; and performing fatigue durability simulation analysis according to a cab inertia release result, a cab-frame part fatigue load spectrum and a cab material corrected strain fatigue curve. According to the embodiment of the invention, an analysis strategy of combining a cab su