Influence of Mechanical Parameter Errors on Pre-impact Speed of Vehicles in Vehicle Collision Models

In order to measure accurately the influence of mechanical parameter errors on the pre-impact speed of vehicles in vehicle collision models，an influence analysis method was built by matrix theory. According to common error forms，the influence of mechanical parameter errors in one model with a centroid origin and another model with a collision center origin on the pre-impact speed of a vehicle was analyzed through a vehicle collision case. The result shows that under the constraint that the relative error in pre-impact speed is not more than 3%，the maximum margin of mechanical parameter error is ±9.7% in the model with a centroid origin, and ±8.7% in the model with a collision center origin.