In order to detect unexpected torsional and lateral vibrations in mechanical drive systems, computer simulation is crucial to determine the dynamic behavior of rotating machinery. This company offers a new, revised software package to simulate both torsional and lateral vibrations while also considering nonlinear characteristics (such as high-elastic coupling elements, gear couplings and backlash in gear stages), steady state and also time-transient conditions. A software package for a comprehensive rotordynamic analysis, including fluid-film bearings (photo), is also available and integrated into the rotordynamic analysis simulation system ARMD 5.7 G2. — ARLA Maschinentechnik GmbH, Wipperfuerth, Germany