A modeling method of a steering system for a vehicle comprises the steps
of interpreting a coupled relation between an upper tube and a lower tube
comprising a steering column, interpreting a coupled relation between the
upper tube and an upper bracket and a coupled relation between the lower
tube and a lower bracket, and interpreting the movement of a bearing
mounted between a steering axle and a steering column using a cylindrical
coordinate, thereby improving credibility relative to the interpretation
result of a model When the interpretation result is applied to an actual
vehicle, the impact absorption capacity and idle vibration capacity are
greatly increased, thereby improving the performance of the overall
steering system and ensuring safety to the occupants of the vehicle.