Cwycyshyn, W. and Fedullo, J., "A Computational Method for Efficient Hub Offset Comparisons with Deflected-Disc Dampers," SAE Int. J. Passeng. Cars - Mech. Syst. 6(3):1383-1388, 2013, doi:10.4271/2013-01-1357.
With deflected-disc dampers, digressive force-velocity shapes are achieved via the combined effects of disc stack stiffness and hub-offset. The degree of digressiveness can be adjusted to alter vehicle performance by changing the proportion of these parameters. Optimizing this relationship can yield substantial vehicle performance improvements, but the time consuming iterative process of developing a new disc stack for each hub-offset discourages experimentation.To enable more efficient digressiveness comparisons, a regression-based computational method has been developed which converts disc stack stiffness from one hub-offset to other offsets directly, without iteration. Once an initial disc stack for one offset has been tuned by traditional methods, stacks for other offsets can be calculated that maintain overall damper control. This paper will present background information on deflected disc valving and curve shaping, describe development of the computational method, and show an example of a typical comparison, graphically.