A Case for High-Fidelity Analysis of Nonlinear Electromechanical Torsional Dynamics, or ``Are You Really Sure It Won´t Destroy Itself?´´

Increasing drive system size and complexity has produced a trend towards higher risk of premature component failure due to excessive dynamic torsional stresses. There is a need for an accurate modeling of the total drive system including nonlinearities and component interactions. Effect of model ``fidelity´´ on the predicted dynamic torques in several drive systems which have been studied are discussed. The results show that model fidelity can be a highly significant factor in assessing design system risks as components operate closer to their design limits.