The engineering jobs contain calculations and simulations of TORSIONAL VIBRATIONS of straight, branched, and intermeshed drive systems (drivelines, powertrains) also considering nonlinear characteristics (e.g. rubber couplings, gear stages with backlash, shift and engage effects in clutches, etc.) in the time or frequency domain. We can follow steady-state conditions or time-transient effects in the simulation environment. Furthermore, control effects may be part of an expanded torsional vibration model.
The CAE results show the natural frequencies (critical speeds) usually presented in so-called “Campbell” diagrams (interference diagrams, waterfall diagrams), as well as the graphical interpretation of the vibration modes (modular forms, mode shapes). We also get simulation results showing the expected amplitudes and magnitudes (usually taken from torque signals, velocities and speeds, accelerations) depending on the existing excitations (i.e. excitation torques of the motor, the engine, the working process, and the operating conditions).
A typical torsional vibration analysis (TVA) is structured as follows:
We distinguish between two different simulation methods for our CAE analysis:
a) the “STEADY-STATE SIMULATION” (i.e. the simulation of the steady-state operating condition with constant operating speed also known as “simulation in the frequency domain”)
b) the “TIME-TRANSIENT SIMULATION” (i.e. the “simulation in the time domain” to determine the time-transient response of the drive system depending on time-variable operating conditions also considering nonlinear effects like gear backlash)
Possible resonances can be predestinated (“simulated”) – similar to a “weather forecast” of the dynamic behaviour of the complete drive system (driveline, powertrain).
Source: RBTS, Inc. / USA (Software: ARMD)
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 (cars, trucks, any other vehicles). Special references and extended information particularly on this subject are available on request.
Source: ESI-ITI, Dresden / Germany (Software: SimulationX)
More detailed information concerning all the other subjects are available as well.
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Please visit our special sites for more detailed information:
Analysis especially of lateral and flexural vibrations including a stability analysis of rotor bearing systems in rotating machinery supported by the software ARMD. Learn more …
The virtual development process requires suitable R&D software tools, simulation environment, measurements, field tests, experiences. Learn more …
Publications by Dr. Andreas Laschet: technical papers in journals, conference papers, book contributions. Learn more …
Further information are also summed up in the following documents (PDF):
Further Information available as Downloads (PDF):