Torsional vibration
The torsional vibration or torsional vibration is an important mechanical vibration in technology . In contrast to translational oscillation, torsional oscillation involves an oscillation around the rotational degree of freedom of a system.
General
When single-mass oscillator, the resulting oscillation period depends ( period ) from the rigidity of the torsion spring and the rotational inertia of the coupled rotation crowd. In the case of multi-mass oscillators, the torsion springs are usually torque-transmitting components such as shafts or couplings , between which the rotational inertia (e.g. gear wheels or flywheels ) are located.
Desired torsional vibrations
Torsional vibrations are desirable in areas where they are required as a time standard , such as the vibrating balance wheel in mechanical watches .
Undesired torsional vibrations
In vehicles or ship propulsion systems with internal combustion engines , torsional vibrations are often excited by the rotational irregularity of the crankshaft and must therefore be dampened accordingly. These torsional vibrations are undesirable (e.g. in mechanical drive systems ) where they are the cause of component failure, disturbing noise or vibration . The calculation of the torsional vibration properties ( natural frequencies , natural modes ) is therefore a fundamental task when designing a drive system.
The term roller burnishing is used for rail vehicles . Rolling describes torsional vibrations of the two wheels of a wheelset against each other, which results in torsional vibration in the wheelset shaft . The torsional vibrations cause wear that can be prevented by anti-roll protection.
damping
Frequently, damper elements such as special elastic couplings (e.g. dual mass flywheel ) or additional flywheels ( vibration absorbers ) are integrated into the drive train . Torsional vibrations in systems that actually run smoothly can be stabilized again by means of magnetic coils that generate vibrations in push-pull.
simulation
In order to be able to develop drive trains better, torsional vibrations of an internal combustion engine can be simulated with a torsional vibration generator.
literature
- KE Hafner, H. Maass: Torsional vibrations in the internal combustion engine. Springer, Vienna 1985, ISBN 3-211-81793-X
- Dresig, H. , Fidlin, A .: Vibrations of mechanical drive systems: modeling, calculation, analysis, synthesis , Springer Vieweg Verlag ; 3rd edition, 2014, ISBN 978-3642241161 .
Individual evidence
- ↑ Helmut Lindner, Wolfgang Siebke: Physik für Ingenieure, Volume 10. Hanser Verlag, 2006, ISBN 978-3446406094 , p. 194 ( limited preview in the Google book search).
- ↑ Rolf Isermann : Mechatronic Systems: Basics. Springer, 2007, ISBN 978-3540323365 , p. 149 ( limited preview in Google book search).
- ↑ Rolf Isermann: Mechatronic Systems: Basics. Springer, 2007, ISBN 978-3540323365 , p. 156 ( limited preview in the Google book search).
- ↑ Simulation and modeling of drive systems. simulationx.de, archived from the original on February 6, 2016 ; accessed on February 6, 2016 .
- ↑ Measurement, analysis and reduction of torsional vibrations. tugraz.at, archived from the original on February 6, 2016 ; accessed on February 6, 2016 .
- ↑ Thomas Benker, Thomas Weber: Rolling. (PDF) In: EI railway engineer. April 2015, p. 47 ff , archived from the original on February 6, 2016 ; accessed on February 6, 2016 .
- ↑ Disturbing vibrations - problem solving for research and industry. November 6, 2003, accessed December 15, 2009 .
- ↑ 2nd International Symposium for Development Methodology, 2007, Wiesbaden. (No longer available online.) Formerly in the original ; Retrieved December 14, 2009 . ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
