Research and application of key stiffness parameters of body-in-white based on statistical analysis

A stiffness parameter database of body-in-white (BIW) is established based on a large number of measured data. By studying the correlation between stiffness parameters and that between stiffness parameters and other parameters in database through statistical analysis, a method of defining key stiffness parameters, including bending and torsional stiffness and first order bending and torsional modal frequencies based on the basic dimension of vehicle body, covering length, width, height, wheel base and track, and presetting lightweight coefficient. Finally the method is applied to defining the key stiffness parameters of a passenger car BIW, verifying the effectiveness and practicality of the method proposed. © 2016, Society of Automotive Engineers of China. All right reserved.