Method and arrangement for simulating the motion of a rotatable body

A method for simulating a motion of a rotatable body in a simulation computer using a brake test bench that comprises an engine, a real rotatable body representing the simulated rotatable body and a brake for braking the real rotatable body, the method comprising:

• specifying a target speed using the simulation computer;
• applying this target speed to the engine;
• rotating the real rotatable body via the engine pressurized with the target speed;
• specifying a braking value using the simulation computer;
• controlling the brake acting on the real rotatable body on the basis of the specified braking value;
• measuring the actual torque and the actual speed of the real rotatable body;
• determining whether the actual speed exceeds a predetermined limit speed, and
• simulating the motion of the rotatable body in the simulation computer on the basis of a torque of the simulated rotatable body corresponding to the measured actual torque of the real rotatable body if the actual speed exceeds the predetermined limit speed, or simulating the motion of the rotatable body in the simulation computer on the basis of a determined value for the torque of the simulated rotatable body if the actual speed does not exceed the predetermined limit speed.