Torsional Vibrations

… in Rotating Machinery, Vehicles (Cars, Trucks), Ships

The engineering jobs contain calcu­lations and simula­tions (above all TORSIONAL VIBRA­TIONS) of straight, branched, and inter­meshed drive systems also consider­ing non­linear characteristics (e.g. rubber couplings, gear stages with back­lash, shift and engage effects, etc.) in the time or frequency domain. It is possible to observe steady-state conditions or time-transient effects in the simu­lation environ­ment. Further­more, control effects may be part of the torsional vibration model.

The CAE results show the natural frequencies (critical speeds), the presen­tation and inter­pretation of the vibration modes (modular forms, mode shapes), and also the expected amplitudes and magnitudes (usually taken from torque signals, velocities and speeds, accelerations) depending on the existing excitations (from the motor, the engine, the working process, and the operating conditions). Possible resonances can be pre­destinated – similar to a „weather forecast“ of a technical system.

Even dynamic-acoustic effects can be predicted as part of so-called NVH studies (NVH = noise, vibration, harshness) which are important when optimizing automotive drive­lines and complete power­trains. Special references and extended information particularly on this subject are available on request.

More detailed information concerning all these subjects will be presented on this web site soon.

Simulation of a Compressor Drive System
Reference/Source: RBTS, Inc. / USA (Software: ARMD)

 

Measurements compared with CAE Analyses

 

Applying CAE Tools: Simulation Models of Complete Drive SystemsReference/Source: ESI-ITI, Dresden / Germany (Software: SimulationX)