Reduction method and device for power assembly suspension road spectrum load

The invention discloses a reduction method and device for the power assembly suspension road spectrum load. The method comprises the following steps: obtaining the superposed road spectrum load of a target power assembly suspension under various preset types of working conditions, carrying out the rain flow statistics of the superposed road spectrum load to obtain a rain flow statistics matrix, obtaining a rain flow statistical matrix, calculating a peak value and a valley value of each rain flow cycle to stress and a corresponding displacement amplitude in the rain flow statistical matrix, calculating a strain amplitude corresponding to the displacement amplitude, calculating a first damage of the target power assembly suspension rubber according to the amplitude, and by combining a preset reduction principle, reducing the road spectrum load of the target power assembly suspension. Visibly, under the condition of considering the structural characteristics and rigidity nonlinear characteristics of the suspens