Simulation starting system and starting method for test bed of plane-engine accessory casing

The invention relates to a plane-engine accessory casing test bed simulation starting system and starting method, and belongs to the field of transmission. The system comprises a loading motor, a main dragging motor, a starting motor, a torquemeter a, a torquemeter b, a torquemeter d, a main step-up gear box, a central bevel gear box, a starting step-up gear box and a clutch b; one end of the input end of the main step-up gear box is connected with the torquemeter a, the other end of the input end of the main step-up gear box is connected with the clutch b, the torquemeter a is connected with the loading motor, the clutch b is connected with the main dragging motor, the output end of the main step-up gear box is sequentially connected with the torquemeter b, the central bevel gear box and the plane-engine accessory casing, and the starting motor is sequentially connected with the starting step-up gear box, the torquemeter d and the plane-engine accessory casing. According to the invention, the simulation star