Samenvatting
Significant changes in frequency and damping ratio from linear values are shown for the transient response of a one degree of freedom model. The forced response is shown to be of the classical left-leaning softening type, with jump/drop phenomenon. A two degree of freedom model is shown to have a very small amplitude limit cycle for operation abovethe critical velocity. Conversely, a three degree of free-dom model is shown to have no stable limit cycle above the critical velocity.